Going from 3.55's to 3.27's.... general questions - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 10 Old 08-02-2009, 11:17 AM Thread Starter
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Going from 3.55's to 3.27's.... general questions

I have a question. My car has 3.55's and the mph is unusually low for my setup. I haven't used the 2-step yet, but am hoping this makes a huge difference. I see all of these cars running 118-120 or so with the same power my car's making. So far, I have it narrowed down to a few potential culprits. It may be ONE or ALL of these affecting the times. Again, I'm not near as interested in lack of ET as I am MPH, although I'm beginning to think on an auto turbo car, they're one in the same. So far the best the car has done in the 1/4 has been a 12.8 @106 @ 12#'s with a 1.92 60'. The car has a fresh built AOD and a TIGHT converter. I can only get to about 2000 rpms before it tries to powerbrake. Now, I KNOW that the tight converter is hurting my launch. But the other thing I'm concerned about is the lack of mph between the 1/8th mile mark and the end of the 1/4. The car only picked up 21mph. Seems REALLY low. As far as the tune, I've had 2 different dyno sessions and the car is making the power. @ 12#'s it makes 420/450tq. That should get me close to 120 in the 1/4 @ 3550 lbs.
SOOOO, the things that I think are contributing are:
Converter too tight? Need to get closer to 2800 rpm or so on the footbrake?
Need to get into boost sooner (read converter, or 2-step)
Need to launch on 2-step (BTW, I got it wired up and can make 2#'s @2000rpm.
Will going from 3.55's to 3.27's help "load" the car better and result in better mph?


'91LX Vert- Stock Shortblock, Stock Cam, Cobra Intake, Edelbrock Performer 1.9's, 42#er's, PMAS 3", AOD, 3.27 gears, B&G 70mm Single, 3500lbs w/ me
Best 1/8- [email protected] with a 1.64 60'
Best 1/4- [email protected] with a 1.66 60'
Funniest 1/4- [email protected] LOL
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post #2 of 10 Old 08-02-2009, 11:37 AM
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Whats your 1/8th mph?

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post #3 of 10 Old 08-02-2009, 02:21 PM
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I went from 11.30's-11.70's at 118-122 w/ 3.73's and no 2 step


to

10.50'[email protected] with 3.27 and launching with a 2step

1986 Mustang GT
306 E303, TEA 185 TW, Quicktime Turbo 67mm, Redneck C4 15lbs boost
525hp/626tq
*Sold drivetrain - Rolling Chassis may be available*
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post #4 of 10 Old 08-02-2009, 04:03 PM
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Originally Posted by ratedz View Post
I went from 11.30's-11.70's at 118-122 w/ 3.73's and no 2 step


to

10.50'[email protected] with 3.27 and launching with a 2step
WOW, good times there.

Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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post #5 of 10 Old 08-02-2009, 09:57 PM
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hmm..

I yhave 4.10's in my car. When I install the gears the car felt slower Alot. Now Ive got my turbo kit that will be going on wednesday. Do u guys think I need to put the stock gears back in?
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post #6 of 10 Old 08-02-2009, 10:08 PM
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Originally Posted by nbatchler View Post
I yhave 4.10's in my car. When I install the gears the car felt slower Alot. Now Ive got my turbo kit that will be going on wednesday. Do u guys think I need to put the stock gears back in?
I got 3.73 but want to put back 3.27 as I have head it's the best gear and help spool faster cause of load. 4.10 is just way too low gear for turbo car and you woun't be enjoying boost cause it will go by fast.

Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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post #7 of 10 Old 08-02-2009, 10:14 PM
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Originally Posted by 2002mustanggt View Post
I got 3.73 but want to put back 3.27 as I have head it's the best gear and help spool faster cause of load. 4.10 is just way too low gear for turbo car and you woun't be enjoying boost cause it will go by fast.
My question is will it be faster with the 4.10 gears until 120mph or slower?
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post #8 of 10 Old 08-03-2009, 11:00 AM
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Originally Posted by nbatchler View Post
My question is will it be faster with the 4.10 gears until 120mph or slower?
Slower I will say plus you might run out of 4th gear at the track. Forgot to ask what kit did you get? 5.0 or 4.6l ?

Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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post #9 of 10 Old 08-03-2009, 07:28 PM
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Slower I will say plus you might run out of 4th gear at the track. Forgot to ask what kit did you get? 5.0 or 4.6l ?
same kit as u!
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post #10 of 10 Old 08-04-2009, 01:33 AM
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same kit as u!
You going to f**king love it.


Voodoo racing innovation built 4v , powerglide, borg warner s475 at 29psi, custome turbo kit , pro efi ecu, Aeromotive fuel pump, aeromotive fuel rails, id 1000 injectors, e85. Best to date 1.36 60'
Best pass to date 8.92 at 156mph. Best 1/8 mile 5.6at 127 mph.
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