1/4 Mile Results from Going to 3.73 from 3.23 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
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post #1 of 10 (permalink) Old 09-05-03, 09:08 PM Thread Starter
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1/4 Mile Results from Going to 3.73 from 3.23

Here is my experience in fitting 3.73 gears to my car (see sig). My old gears were 3.23.

Previous best at Calder was 15.78 @ 86mph.
Last night I did 15.53 @ 87mph. 60ft times improved accordingly.

I was surprised by the latest time as the car feels much quicker off the line. Anyway I guess the old 5.0 needs a rebirth. hahaha!

Mick


2004 BA XR6 TURBO Phantom, Auto, Premium Brakes & Sound, Leather etc. etc.

APS Stage II = 267rwkw = 12.16@118.5mph on street tyres
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post #2 of 10 (permalink) Old 09-05-03, 10:30 PM
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Re: 1/4 Mile Results from Going to 3.73 from 3.23

What was the difference in wheel spin off the line between the 3.23's and the 3.73's?

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post #3 of 10 (permalink) Old 09-06-03, 01:50 AM
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What engine do you have running it, .3 of a sec doesn't seem that much quicker. Man or auto?
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post #4 of 10 (permalink) Old 09-06-03, 02:25 AM
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Re: 1/4 Mile Results from Going to 3.73 from 3.23

clevo i believe that information is supplied in his signature....

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post #5 of 10 (permalink) Old 09-06-03, 04:33 AM Thread Starter
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Re: Re: 1/4 Mile Results from Going to 3.73 from 3.23

Quote:
Originally Posted by EBXR
What was the difference in wheel spin off the line between the 3.23's and the 3.73's?
Have to be honest and say I don't think there was any significant wheel spin in either situation. I generally stage with foot hard on the brake and the engined stalled to about 1800RPM. I just think that the 3.73's aren't suited to the engine which is way past it's peak power producing ability at the 5250RPM gear changes.

On the street I can certainly get more wheel spin with the 3.73's due to the increase in torque at the rear wheels.

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APS Stage II = 267rwkw = 12.16@118.5mph on street tyres
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post #6 of 10 (permalink) Old 09-06-03, 06:48 AM
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Re: 1/4 Mile Results from Going to 3.73 from 3.23

Quote:
On the street I can certainly get more wheel spin with the 3.73's due to the increase in torque at the rear wheels.
tell me about it..i just fitted 3.9s to my car a few weeks ago - it will spin up and slip a tiny bit to the left on a 1-2 shift (manual) i could never do that before with 3.45s....wheelspin is fun :D

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post #7 of 10 (permalink) Old 09-07-03, 04:52 AM
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Re: 1/4 Mile Results from Going to 3.73 from 3.23

so if i put 3.9's in my ef xr8 which has 3.23 in it now ill get more wheel spin than b4 (manual) to how much qiker would it b with the 3.9's

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post #8 of 10 (permalink) Old 09-07-03, 10:08 AM
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Re: 1/4 Mile Results from Going to 3.73 from 3.23

I believe a manual should have 3.7 and an auto 3.9 check the workshop manual on the first gear ratios, in auto and manual, by my calculations 3.7 perfect for manual, 3.9 perfect for auto. But just from a change in diff ratio has neted a 15.5 from a 15.7, in my experience in 1/4mile racing its a good time to get with just gears.

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post #9 of 10 (permalink) Old 09-07-03, 06:49 PM
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Re: 1/4 Mile Results from Going to 3.73 from 3.23

Have you plotted the gear changes with the 3.7s? Is there an extra gear change before crossing the line now?

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post #10 of 10 (permalink) Old 09-08-03, 06:24 AM Thread Starter
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Re: Re: 1/4 Mile Results from Going to 3.73 from 3.23

Quote:
Originally Posted by Aussie Pete
Have you plotted the gear changes with the 3.7s? Is there an extra gear change before crossing the line now?
I'm running an auto. With 3.23's I crossed the line doing approx. 3900rpm in third, with 3.73's it was approx 4500 in third. As posted terminal speed was almost identical in both cases.

2004 BA XR6 TURBO Phantom, Auto, Premium Brakes & Sound, Leather etc. etc.

APS Stage II = 267rwkw = 12.16@118.5mph on street tyres
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