Car is getting slower in 1/4 - Page 3 - MustangForums.com


4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 06-27-2011, 07:44 AM   #21
teej281
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Do not run drag radials on your IRS! If anything find an extra 2 v6 wheels and throw some slicks on them if you want to run. IRS+DR's=broken half shafts every time.

Back to the issue at hand. I think its all in the 60' and the spinning after shifts thats hurting you. Spinning will add MPH but hurt ET. Its been proven many times. Also, clutch slipping is probably the reason for the slower 60'. Plus tires could have been "newer" and bit better back 2 years ago. Overall, I think your car is still performing the same, just the clutch might have seen its better days and the tires might not be as grippy as they were. Track prep too is also a concern to check into.
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Old 06-27-2011, 10:43 AM   #22
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Teej....why is it okay to run slicks but not drag radials?
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Old 06-27-2011, 10:48 AM   #23
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Radial means stiffer sidewall than a slick. Running full slicks give you the soft sidewall to absorb the shock of a launch. Drag radials stick great, but they have a radial sidewall which is still stiff and shocks the halfshafts hard on a launch, contributing to their failure.
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Old 06-27-2011, 11:00 AM   #24
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Slicks will kill irs halfshafts fast as well, i got 3 terminators drivers berween 470 and 520 and a tow truck driver to attest to it.
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Old 06-27-2011, 11:05 AM   #25
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Well if there is an issue with the half shaft before putting the slicks on it will break. But you'll have less chance breaking with a slick.
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Old 06-27-2011, 11:25 AM   #26
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Quote:
Originally Posted by teej281 View Post
Well if there is an issue with the half shaft before putting the slicks on it will break. But you'll have less chance breaking with a slick.
May be less chance but it still a good chance of failure regardless especially with high hp. A 400 hp car with irs has the same axle failure rate as a 500rwhp car woth a 28 spline SRA, both woth equivent tires
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Old 06-27-2011, 11:32 AM   #27
teej281
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There are guys running 9's on stock half shafts with 700rwhp on slicks...
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Old 06-27-2011, 11:37 AM   #28
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Another thing that makes me further disagree about this slap a slick on and go theorybis that for car under 300 wheel HP a full blown rinkle wall slick is probably to much tire forthe power level which means your reall gonna have to come off the line hard and high in the rpm range so u dont bog it out which honestly maybe more stress than coming off the softer with a drag radial. I mean if you think ur gonna put a slick on a 260rwhp and come off the line at 2500 you got another thing coming.
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Old 06-27-2011, 11:39 AM   #29
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Quote:
Originally Posted by teej281 View Post
There are guys running 9's on stock half shafts with 700rwhp on slicks...
Im sure there is, i can also read on the internet people running 9s on a horrible stock chevy 10 bolt. My 3 examples are from first hand expereince of friends cars at the track not what some guy managed to get away with on the internet, just saying. I think your JDM roots are showing a little Teej dont take offense.

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Old 06-27-2011, 11:59 AM   #30
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Quote:
Originally Posted by teej281 View Post
There are guys running 9's on stock half shafts with 700rwhp on slicks...
yeah...but if they are running autos that absorbs some of the shock as well.
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