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i have a 96 cobra built bottom end with hellion hellraiser twin 61's. just finished breakin the motor in on the soft 400rwhp tune. cars going to be stock weight, most likely 4r70w with 18's and bfg's. looking for 600-650 rwhp and 99.9% street almost a dd. im thinking 3.27's or 3.55's cant decide i need some help.

also one last ques. a friend has wrx with 20+ psi wen we race with both getting good launches hes about a car nd half behind. thts with me having 400rwhp, t45 and 4.10's. so with everything being the same except me having 3.27's or 3.55's should i put more cars on him?

thanx
 

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i have a 96 cobra built bottom end with hellion hellraiser twin 61's. just finished breakin the motor in on the soft 400rwhp tune. cars going to be stock weight, most likely 4r70w with 18's and bfg's. looking for 600-650 rwhp and 99.9% street almost a dd. im thinking 3.27's or 3.55's cant decide i need some help.

also one last ques. a friend has wrx with 20+ psi wen we race with both getting good launches hes about a car nd half behind. thts with me having 400rwhp, t45 and 4.10's. so with everything being the same except me having 3.27's or 3.55's should i put more cars on him?

thanx
your fastest et will probably be with either 3.27's or 3.31's with a 28" tall tire. 3.55's will give you lots of fun factor on the street. It will burn those 18" tires off the rims.
 

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i went with 3.55's

your car is plenty heavy enough to load the turbo's with a 3.55, esp with an auto. Just stall it right

and yea, it'll be lots quicker than it is now
 

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Always the great debate!! ;)
My question is how many RPM's are you going to turn this new motor with the twin setup??
I personally have run both 3.55's and 3.27's with my 93 cobra Hellion T-76 on the street and stuck with the 3.27's beacuse it manily is a weekend warrior not to worried about et's at the track with this car.
I did have alittle better et's with the 3.55's at the track before but THIS DEPENDS ON MANY VARIABLES!!! The 3.27's will give better mph in most cases and is very strong on the street. Depends on your overall goal?
 
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