Gears: Can you really knock off 9 tenths?? "ET GUESSES"

[Dark_5.0]

One of the salesman for the company that I work for who also builds race car engines told me that some of the cars that he has worked on have dropped 9 tenths in the quarter with a simple gear swap.

I was expecting to knock off about 5-7 tenths in the quarter after my gear swap from 2.73's to 3.73's.

This will be the first "major" mod that I have done to my car and I cant wait to see how much it helps, also after the gear swap should I run more MPH than I am now?

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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. Edelbrock 1 1/2 inch drop springs.
best 60 ft 2.14, best 1/8th 9.65, best 1/4 15.2 @89mph, Stock gears and 3000+ Altitude

[lx mike]

some of the cars that he has worked on have dropped 9 tenths in the quarter with a simple gear swap.

must have been a very mismatched combo if a simple gear change picked up that much


you'll pick up a bit but not close to 9 tenths, more like .2-.3 as for m.p.h to increase mph you need more hp.

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

[Stang Runner]

I just got 3.55 form 2.73 and so far I have not got a clean run I have only made it 3 gears a costed to my best Time ever I costd 2.5 sec I will tell what I get This week some time. The car seems MUCH FASTER now.

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1988 LX 5.0 Was 3060lbs (full Tank) 14.62@96.9On a Gtech Drivetrain: 3.55, World Class T-5, Lakewood Bellhousing, Adjustable Cluch Cable, AL Driveshaft, Manual Steering Rack Suspension: MAC Control Arms,Maximum Motorsports Front Grip Package, H&R Sport Spings, Bilstein Shocks
Engine: Steal Mounts, K&N, Under Drive Pulles Exhaust: 1 5/8 Un-Equal Length Mac Headers, X-pipe W\cats, Edelbrock cat\back Cooling:3 Core Radiator

[my name is mud]

Originally posted by lx mike:
to increase mph you need more hp.
[/B]

To increase mph you just need to put more hp to the ground, if you're way out of your pwerband w/stock gears(you probably are, even with a stock car) and the gears let you use more of your hp, your mph will improve. I picked up .6 and 3mph going from 2.73 to 3.73, some of that was probably experiance/ learning to drive better though.

[smokedchevy]

5-7 tenths max!

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92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters

[jeb]

Well, I dropped 7/10's by swapping to a five speed. Though I dropped some spinning weight, it's basically a change in gear ratio. It went from 2.40 1st gear, to 3.35, which is like having an auto with 3.73's.

Now, I went to 3.55's from 2.73's and my traction went to sh!t. I went from 14.7(@65*) to 15.0 (@95*). The temperature differences would probably equal out the times, but I was pissed.

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90LX Ragtop.
14.7@95.3
Strut tower brace, K&N, 2.25'' Flowmasters, Hollow cats, Crank pulley, Crane 2031, Crane rockers, Holley FPR, 155lph, Heavy duty clutch, and alum quadrant.
Need Gears Bad!!!

[smithbling]

Originally posted by jeb:

Now, I went to 3.55's from 2.73's and my traction went to sh!t. I went from 14.7(@65*) to 15.0 (@95*). The temperature differences would probably equal out the times, but I was pissed.

That's what I am worried about! My best 60' time is 2.333= 14.689 @ 97.4mph

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C ME FLY
88 Notch
MAC headers, H-pipe, and Chrome 2.5" pipes, pullies, K&N filter, BM shifter, 17" ROH ZR6, Dropped 1.5".

[venumus93]

Originally posted by jeb:
Well, I dropped 7/10's by swapping to a five speed. Though I dropped some spinning weight, it's basically a change in gear ratio. It went from 2.40 1st gear, to 3.35, which is like having an auto with 3.73's.

Now, I went to 3.55's from 2.73's and my traction went to sh!t. I went from 14.7(@65*) to 15.0 (@95*). The temperature differences would probably equal out the times, but I was pissed.

Jeb, I'm also worried about traction problems going from 2.73 to 3.73 in a week or 2. What were your 60' times with diff gears? Were you running at Bithlo(Orlando Speedworld)? That is where I run & I dont think the traction there is very good anyway...I'll post on here as soon as I do my gear swap & get to the track. Mabe time for drag radials or slicks...:-)! Later!


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93Cobra#3974
off-road h-pipe, 2chamber flowmasters, hurst shifter, moroso cold-air induction, march street pullies, best 1/4 14.461 at 98.15mph, best 60' 2.233