Need help in calculating high speed run potential...
 

I've notice that some of you are very smart about these things...

One of the guys on a local board here claims that he will reach 280km/h (175MPH) with his relatively stock CRX. His CRX runs a quarter mile of 15.6@87MPH and weights about 2500lbs. From what i can figure that gives him about 130HP.

I took on a $100 bet that he can't pull that off. I even told him he probably can not exceed 235km/h (147MPH) ...

You can read the claims here:
http://www.contemporarycustoms.com/u...ML/001751.html

So is this possible. I know that a stock Viper tops out at 187MPH... but it has 450HP.

Thanks for you help!

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http://members.mustangworks.com/liza...rdKing_sig.gif
13.66 @ 100.3MPH, Stock (except for K&N Filter)

• Quartermile run

Easiest $100 you'll ever make. Now stop picking on those kids that ride the short bus! http://www.mustangworks.com/msgboard/tongue.gif

no chance the he will even be close to 175 mph!! geesh if he only runs 87 in 1/4 and you figured his hp at 130 unless his car is very aerodynamic he will stop pulling WAY before then.

he can get his teg (sp) computer to raise his redline as far as he wants it doesn't mean he will reach it in top gear. he is going by how it feels at lower speeds and wil find out that he will stop pulling far before he thinks.

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93-LX: 5 Speed, Flow's with H-Pipe, 3.73's Sub's and K&N.

He's been playing too much Playstation...In real life, there's no way...



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1997 GT Flowmasters,K&N,FMS 3.73 gears, Synthetics
RedSOHC

My guess is he hits 128mph after 5 miles, then chokes himself to death for being a retard.

Hey Lizard it should be easy money I have a CRX 5 speed with about 120hp. I hit about 135 and thats all it has in it. I was scared as hell going 135mph in that little @ss car even if my CRX could go 175 theres no way I would try it the wheel base is too short to take it to those speeds safely.

I cant remember the name of the site but there is a CRX site that has a story about a guy that hit 147mph with a stock CRX SI with just bolt ons and that was some kind or european record.

I'll bet he can hit 147 mph though. Downhill, with a 45 mph tailwind. Those cars aren't even geared high enough to do that.

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1991 LX Hatch 5.0L

That guy is all most a stupid as this guy that was convinced he could wip me in top speed, He had a Dodge Colt. With its stock 4 in it it was not the trubo one, and to top that it was a 4 door wagen. I tryed to bet with him but he would not. http://www.mustangworks.com/msgboard/frown.gif We did race and well I gave him about a 20 sec head start. I passed him going about 140 and it thought I was going to die when I when over a hill well stated flying. He was going 120 when I passed, Well he never said much after that. You are lucky to find a guy with no brain http://www.mustangworks.com/msgboard/smile.gif

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1988 LX 5.0
Drivetrain: 2.73 Stock Gears, World Class T-5, Lakewood Bellhousing, Summit Adjustable Cluch Quadrant & Cable, Alumminum Driveshaft, Flaming River Manual Steering Rack
Suspension: MAC Control Arms,Maximum Motorsports Front Grip Package, H&R Sport Spings, Bilstein Shocks
Engine: Steal Mounts, Ram air, K&N, Under Drive Pulles
Exhaust: 1 5/8 Un-Equal Length Mac Headers, X-pipe W\cats, Edelbrock cat\back

How are you going to tell if he drives that fast???

As a relitively educated person, (BSc. Engineering) I will tell you that buddy is on crack.

At high speeds his "weight advantage" will mean nothing. There are 2 things that will limit his top speed.

1. Maximum Engine speed in top gear. This can be calculated from the gear ratios, engine RPM and tire diameter.

2. Wind resistance. Consider the Porsche 911 has a top speed of 174 mph and has 300 HP. Ignoring the HP advantage I'm pretty sure that the areodynamics of the Porshe are far superior to that of the CRX. The sudden "drop" at the rear of the CRX creates severe "pull back" pressure and will actually create a force that will act towards the rear of the car. Then there is the drag friction. The frontal friction will yet to add to the overall forces against the cars forward speed.

Remember you have 3 basic friction forces acting at the same time each incresing non-linearly with the speed. So you have 3 non-linear forces acting at the same time, giving yet an even more complex (and larger) non-linear resistance to movement. And there is still the matter of road friction etc. yet to enter the calculation!

Technically speaking, it is impossible for this guy to hit 175mph.

Get ready to make your $100 (or $65 US http://www.mustangworks.com/msgboard/wink.gif)

The fastest I've ever had my stang to was 220-225 km/hr. In 4th gear, and yeah i had a little more room but not much. 5th gear is an overdrive and is too steep to contribute (atleast in my car).

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Driving: 1998 F-150
Far way in Edmonton==> http://www.mustangworks.com/msgboard/frown.gif
1995 Mustang GT

[This message has been edited by 95mustanggt (edited 06-06-2001).]

Sorry Lizard, I posted before I read the post on the other site. I think everything was said that has to be.

I like how that one guy says not to compare American and Japanese technology. I didn't know that the rules of Physics varied depended on what country you are from! Guess if I want to work abroad I should go to a school in Japan to add to my Canadian Engineering Degree so I don't make mistakes! http://www.mustangworks.com/msgboard/biggrin.gif

Go out now and spend that $100 on the baby. I think he's got his kmh and mph mixed up. Actually, maybe if his car was strapped to the back of a jet plane on a runway takeoff he could reach 170+ http://www.mustangworks.com/msgboard/biggrin.gif

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'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)

For those that don't know the bet post has moved to here:
http://www.contemporarycustoms.com/u...ML/000118.html

I knew this was impossible... I mean if the car was turbo or NOS then ... there is a slight possibility...

Turbos, NOS, Blowers, he can add anything he wants but he MUST have enough power to overcome the resistant forces to achieve that speed. I would guess that he would need more than 425 HP to achieve 175 mph. Not something a "stock" CRX is going to come up with even with a turbo or NOS, and if he tries, say bye bye engine!

Ya, he absolutely cannot, its probably impossible with the gearing, and short of that, he doesn't have the aerodynamics. these idiots who lie just don't understand how fast things are. I've taken my stang to 110 and it was pretty stable (3600lbs, + my friend, so another 180) but was still scary. I had one idiot ricer trying to tell me that he hit 160 in his friends stock eclipse, and were going around turns on backroads at 140.

I stated earlier that I own a 91'CRX and realisticly speaking I think it would be possible to hit 160 with a monster cam and a huge boost from a turbo.

I dont know if any of you have ever driven a CRX but the gearing is just fine for achieving high top speeds it just lacks the power to do so.

I hit 135 at the top of 5th gear and the car did not have enough power to pull anymore than that. My CRX has a cold air intake, headers, port and polished head, 2 1/2 inch exhaust and Jacobs electronics ignition. system

So i guess its not stock, I think my CRX could hit 155-160 with a cam and a turbo. JMO

No way for a stocker http://www.mustangworks.com/msgboard/rolleyes.gif

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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

[This message has been edited by 5.0 HO (edited 06-06-2001).]

LK did you see that picture of the plane and the guys CRX! The only problem is that even when falling an object has a point where the air resistance prevents a falling object from accelerating towards the ground. It is called terminal velocity. I'm not such what it would be for a CRX, but you still can only go so fast due to air resistance! http://www.mustangworks.com/msgboard/biggrin.gif

It's terminal velocity would be directly related to it's coefficient of drag.

I'd be shocked if he could get 120mph out of it. I had a '91 Escort GT, 127hp, it would do about 112mph.

5.0 HO, sorry, but I think your speedometer is a little optimistic. You don't have the hp to hit 135. That would seriously be pushing it for an Integra GSR. Even if you removed the speed limiter (set at 130mph). It's not going much higher than that.

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About twice a month I have some guy like yourself telling me how slow my crx is and I take him for a 130mph+ cruise in it and they shut up http://www.mustangworks.com/msgboard/wink.gif

The speedometer pegs out at 130 or so and I can peg the speedo out so I dont know what to tell ya you people obviously have never driven a CRX if you think it wont hit 130mph yeah it takes it a while to get there but mine will do right at 135 or so. been there done that 9 or 10 times.
speed limiter is gone i have an after market computer.

I have no idea how much HP the crx is pushing I guess somewhere between 120 and 130hp.

I dont race the car it feels slow to me off the line and is no fun http://www.mustangworks.com/msgboard/frown.gif I bought the car for my girlfriend



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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

Make sure he leaves the cash at the starting line because that's one trip he won't come back from. I'm guessing he went and calculated his top speed with this formula and now thinks he can achive it no matter what.

(Tire radius devided by 168 times engin RPM devided by gear ratio)

example: mph at 6500 rpm with 4.9 axle with 14 inch radius tire in 4th gear 1:1 ratio MPH= 14/168x6500/4.90/1=111 mph

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67'fastback-Edelbrock carb,intake,cam,valve springs.Rhode lifters, CompCam rocker arms, windage tray,cerama coated headers,dual flows with H-pipe, modded c-4,tci stall converter,perma cool electric fan,aluminum water pump,griffen aluminum radiator,accel 8.8 cable,wide cap distriburator,magnetic pick up,v-matic hurst shifter,edelbrock performer nitrous, carter electric fuel pump,ignitor coil,solid motor mounts,magna racing suspension,poly urathane bushings,under rider traction bars, comp. eng. s

I agree with Unit (speedo being optimistic)...You need take in account of speedometer error. Most road tests that I've read about that measure actual speed vs indicated speed usually show a 1-3 mph difference at 60 mph. I imagine there would be a greater amount of error from the speedo reading at speeds of 130+.

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1989 lx notch
89,000 miles
bolt-ons,stock heads/cam
60'- 2.07, 8.90@78, 13.93@99

[This message has been edited by TJR (edited 06-06-2001).]

A human freefalling in flare position falls around 120 mph, move to trim position (face down) and it increases to around 150-160 i think.

Now weight has nothing to do with how fast you fall (thanks to Isaac Newton), so in a flare position is there as much drag on me as there would be on a CRX body? Hmm....probably not. So, free-falling, would the CRX even hit 120mph??? I think not. I could be mistaken though.

I think I could run that fast if my legs where geared correctly where I could move them that quick....

I thought in a full out dive humans could approach 200mph?

I know the Peregrine Falcon has been known to do it.

That is so funny!!!

The guy has not put one post since this morning???

I dont get it http://www.mustangworks.com/msgboard/rolleyes.gif I can understand you doubting 175mph but 135mph is easy money.

Dont be closed minded just cause its not a mustang.

A stock crx si will go 130mph, dont talk Sh*t if you have never drove one,

An "Escort" is a POS economy car and in my opinion a CRX is a well built well engineered car that has a great tranny in the 5 speed form. 130mph is no prob for a stock si.

Optimistic my @ss the speedo is barried like no other half way through 5th gear and if anything the 135mph is a low number.

What the hell do you mean the aero dynamics wont allow 175mph There are CRX dragsters that go damn near 200 mph and run mid 7's

I dont even like my CRX but I had to come to its defense cause yall are way low on your top speed assessment of a stock CRX.



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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

I'm still LMAO 280km/h. I've driven a CRX and I couldn't get it past 180 km on the same straight stretch that I reached (what is according to the stang analyzer) 157mph, which is 251km/h.

What would really be funny is the reaction we'd have if he somehow pulled it off.

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GT-40 heads (ported, polished, + milled), B303 cam, 1.7rr's, JE pistons, Offy intake, Carter AFB 625cfm carb, Flowtech 1 5/8" shortys, Flowtech X-pipe, MAC Flowpath exhaust, MAC pulleys, 373's, subframes, Eibachs+Tokicos, B&M ripper, FMS Clutch, Zoom Quadrant+cable, 17" CSA Ultra rims, 235/45ZR17 Yokohama AVS S4's, MSD 6A ignition+coil, FMS 9mm wires, Carbed, Naturally Aspirated, and Nasty!

Ok are we talking about an 88-91 crx si. Cause if its not he wont hit 120, IMO.

Ask yourself this if the crx is such a slow @ss shoebox no matter what you do to it what about the "Honda CRX SI R" that was only produced in Japan.

160hp @7600
redline 8200
111 lb-ft @7000

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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

We doubt 175mph because it is impossible. 135 mph might be possible with a slight downhill slope but it would definately NOT be "easy money". I don't need to drive one to speak confidently on this and I'm not speaking sh*t. I'm not being bias, only saying what probable.

Physics does not care whether you drive a mustang, CRX, school bus, or a tricycle.

This maybe, but once again 130 mph with "no prob:?? I don't care if the f'ing car was built by NASA, quality don't make it any faster.

We're not saying aero dynamics aren't going to allow travel faster than 175 mph. You see when you "free fall" you have 2 basic forces acting on your body. 1. Gravity pushing you down 2. Air resistance pushing you up (effectively). So because force is a vector, you sum the 2 forces. Since gravity does not change (well it does but for all practical purposes we'll assume it doesn't) the force downward stays constant. When the air resistance equals gavity, no more acceleration! That means a fixed velocity (terminal velocity).

In a drag car, the forces driving you forward are a H*ll of a lot higher than gravity, therefore the "terminal velocity" is much higher. Even a 1000 HP car has a terminal velocity due to air resistance, it's just alot higher.

I'm not sure of your education, but that is elementry physics my good man.

I'm not saying you are a big CRX lover or import lover. I'm sure the CRX is a fine car. I'm not bashing any car here. And yes maybe there is error in my estimates. I for one have not actually sat down and done the engineering behind this problem (yet http://www.mustangworks.com/msgboard/wink.gif). But given that several people all seem to agree on similar numbers, all coming from different educational background, countries and car preference (even the other import guys doubt this can be done, and I would guess they are not bias 'cause it's not a mustang).

And Yes red it would be real funny if this guy pulled it off http://www.mustangworks.com/msgboard/redface.gif, but he'd be doing something fishy to get it done.

That's because the coefficient of drag is used to calculate the air resistance http://www.mustangworks.com/msgboard/smile.gif

Ok man education has nothing to do with it you are trying to talk intelligently about a subject that you have no experience in http://www.mustangworks.com/msgboard/rolleyes.gif You obviously have never driven a crx si 88-91 or you would be on my side 130mph is easy with a stock si.

Some of you are really funny " downhill with a 45mph tailwind" Ha Ha Ha!

I think some of you have driven the crx hf and that car is damn slow.

The SI and SI-R are a whole nother ball game they definiately can go 130. I bet the SI-R can do 145-150 stock.

My CRX is a 1.6L 16V DX and with the mods it has I can out run an SI, "Barely"

I dont know how many of you watch the high speed pursuits on TV but on one of those a black Honda CRX SI was evading police @136mph.

and far as I could tell the ground was flat http://www.mustangworks.com/msgboard/biggrin.gif


I am talking from experience. You can talk about physic and gravity all you want.

I guarantee you one thing if you ever drive a 88-91 Honda CRX SI you will feel pretty embarrassed for doubting it will do 130mph cause to tell you the truth it is not that hard for the car to do."BEEN THERE DONE THAT MANY A TIME" "I HAVE A HANDS ON EDUCATION MY FRIEND" http://www.mustangworks.com/msgboard/wink.gif

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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

He want's to lower the bet to 260km/h now... hehehe, he is getting scared. 260km/h = 162.5MPH ... there is no way eh?

In my opinion "lizard" anything over 140 would be impossible for a stock CRX SI. This guy obviously doesnt know that much about speed.

Do you get to inspect his car before his attempt.

175mph No Way!, 162mph No Way!

He would have to do major aero dynamic mods and power mods to reach 160+mph.

Should be easy money for you. http://www.mustangworks.com/msgboard/biggrin.gif at least buy the guy a beer to ease his pain afterwords. http://www.mustangworks.com/msgboard/biggrin.gif

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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

http://www.prestage.com/carmath/calc_hpformph.asp


check out this link, it gives some cool info on top MPH...

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Black, 84 GT, T5, ground effects, shorty headers, dual exh., rear spoiler from a 87.. In the works; 4:10's, 89 ported heads, edelbrock Performer, matched cam and holley carb (?? size)

or this one for maintained speed....
http://www.prestage.com/carmath/calc_HPtoSustainMPH.asp

I'd have to say that I agree! http://www.mustangworks.com/msgboard/biggrin.gif


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Driving: 1998 F-150
Far way in Edmonton==> :(
1995 Mustang GT

I checked some #'s on the net.. a CRX SI's engine is 1590cc/96 cu.in, weighs 2,174 lbs, @ 6000 rpm it produces 108 hp and 100 ft/lb of torque at 5000 rpm...


to reach 110 mph, the car needs 224 hp

to reach 130 mph, the car needs 369 hp

to reach 170 mph, the car would need 826 hp

if these #'s are accurate, there is no way... unless the guy installed a jet engine.

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Black, 84 GT, T5, ground effects, shorty headers, dual exh., rear spoiler from a 87.. In the works; 4:10's, 89 ported heads, edelbrock Performer, matched cam and holley carb (?? size)

From Road&Track, september 1991:
91 crx si, top speed: 125mph (200km/h) http://www.mustangworks.com/msgboard/eek.gif , that's a lot of mods away from 260km/h or 162.5mph.
I'm still laughing in disbelief... http://www.mustangworks.com/msgboard/biggrin.gif

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Are you a phuckin idiot or what a 224hp crx would easily do 160.!!!!!!!!!!

And a 826hp crx would do way over 200mph "IN THE 1/4 mile"!!!!!! http://www.mustangworks.com/msgboard/rolleyes.gif

You are a """Retard""""!!!! http://www.mustangworks.com/msgboard/mad.gif http://www.mustangworks.com/msgboard/rolleyes.gif http://www.mustangworks.com/msgboard/mad.gif http://www.mustangworks.com/msgboard/rolleyes.gif!!!!!!!!

Man did you sound dumb http://www.mustangworks.com/msgboard/biggrin.gif



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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

http://www.prestage.com/carmath/calc_hpformph.asp


Quote;
"Are you a phuckin idiot or what a 224hp crx would easily do 160.!!!!!!!!!!

You are a """Retard""""!!!! !!!!!!!!

Man did you sound dumb"


obviously you missed the part where I said; "If these #'s are accurate, there is no way"


I went to the above website and put in the #'s, and reported the results.... that makes me a 'retard'?? funny how that works... no need to be a prick about it...


and P.s. I was thinking in terms of the real world, how would you propose to get 224 horse out of a 96 CI 4 cylinder??? and still be able to drive it on the street and handle it to 160+mph???

Never once did I say that a stock crx would do 160mph.

826hp to go 170mph!!! HA HA HA! http://www.mustangworks.com/msgboard/eek.gif

I said mine will go 135mph.

You are the prick saying it takes 224 hp to go 130mph on a 2200lb car FUQTARD.

I am almost positive that the "CRX SI R" will go 160 and handle the speed people are making 700hp with a 1.6L engine on the import drag racing circuit. http://www.mustangworks.com/msgboard/wink.gif

Your statements were the most off the wall uneducated, ignorant and outragous thing I have ever heard dont try to take it back now cause you posted that dumb sh!t not me. So dont get mad when I call you out on it. http://www.mustangworks.com/msgboard/rolleyes.gif

http://www.mustangworks.com/msgboard/biggrin.gifI could even make the "SHORT YELLOW BUS" you used to ride go 170mph with 826hp. http://www.mustangworks.com/msgboard/biggrin.gif

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88 mustang gt convertible bored to 306 BBk equal length headers mac cold air fender kit cowl hood nitto drag radials ford racing clutch flow masters h-pipe 160* thermostat 16 degrees of timing electric fan off 94' t-bird jacobs electronics cap and wires.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph

[This message has been edited by 5.0 HO (edited 06-07-2001).]

This is too funny. http://www.mustangworks.com/msgboard/smile.gif

One thing people need to remember is that weight does not have that much to do with top speed, only how long it takes to get there.
As for being able to predict how fast a given car will go, it's just too complicated without knowing all the details of that particular cars setup - it really depends on the final drive ratio, the amount of change in gearing in shifting from one gear to the next at high speed (i.e. if you shift from 4-5 at redline in my stock geared '00GT it comes out of the powerband because 5th is so tall and you are screwed), and what the engine's powerband looks like. After all that then you figure in wind resistance and other friction factors.
I say run that turd and then let's hear about how fast it can go.
We can all agree that in general for a given aerodynamic configuration, the wind resistance increases as the square of the speed. Thus an approximation would tell you that is a stock CRX with 108hp can do 125mph according to the car mag, then to go 150mph you better be packing almost 50hp more than stock, which is no small feat for an engine that size. (150/125)^2 x 108hp = 155.5hp.
The trick here though is that the car needs to be able to make that horsepower at the exact rpm that it would be going that speed.
That is the main reason why people's cars won't go as fast as they think they will.

And that's all I have to say about that. ;-)

And please don't question my education.