Need help in calculating high speed run potential...

[Lizard King]

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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13.66 @ 100.3MPH, Stock (except for K&N Filter)

• Quartermile run

[fordmanck]

Easiest $100 you'll ever make. Now stop picking on those kids that ride the short bus!

[lx mike]

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

[blue00gt]

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

[Dark_5.0]

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.

[jonnyk]

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

[Stang Runner]

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. 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

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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

[Stang Runner]

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

[95mustanggt]

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 )

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==>
1995 Mustang GT

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

[95mustanggt]

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!

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+

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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)

[Lizard King]

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...

[95mustanggt]

Originally posted by Lizard King:
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!

[dinomite]

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.

[Dark_5.0]

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

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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).]

[95mustanggt]

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!

[Unit 5302]

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.

[Dark_5.0]

Originally posted by Unit 5302:
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

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 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

[Fostang]

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