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Cobb Access Improvement

RCCC

By RCCC,
in R35 GTR

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RCCC Enthusiast

RCCC

Posted
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For people who track their cars, what sort of time improvement would you expect from say a Cobb tune, mid pipe and cat back exhaust upgrade?

Also has anyone v-boxed the before and after 0-100, 1/4mile times?

I am trying to compare the (09/10 cars with simple mods) with the (2011 models)

Cheers

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LSX-438 Mentor

LSX-438

Posted
Posted

I ran my 09 car for about a year with the stocker tune, about 10~15 track days at EC, WP and OP. After applying the Cobb tune, track times were no better, and initially went backwards a bit... There are a number of factors. The first generation of R35 tunes had explosive power application, overwhelming VDC thus pulling power and running slower. Thankfully Willall came to the party with a tune which applied power/boost in a more linear fashion, suited for the circuit, which helped a lot. If you're running with an extra 50 or 100awkw, VDC just doesnt work (as intended). You need to turn it off and/or be much more judicial with the throttle.

It's difficult to quantify my lap time improvements as i've made a bunch of changes surrounding suspension, tyres, aero and brakes. But if i had to guess, at a track like Eastern Creek, i would say adding 40awkw equates to about a second improvement straight up in the R35.

As for 1/4 mile, i can't remember the stocker time, but running the Willall 98 tune, i ran 11.1 @ 128mph, and with Martins E85 tune i ran 10.73 @ 132mph. 0-100km/hr run on the 98 tune was 3.1s as measured on the VBOX. I havent measured the 0~100km/hr with the E85 tune yet, i think.

fungoolie Community Regular

fungoolie

Posted
Posted
As for 1/4 mile, i can't remember the stocker time, but running the Willall 98 tune, i ran 11.1 @ 128mph, and with Martins E85 tune i ran 10.73 @ 132mph. 0-100km/hr run on the 98 tune was 3.1s as measured on the VBOX. I havent measured the 0~100km/hr with the E85 tune yet, i think.

Stock's between 11.6 and 11.8 quarter time and 0-100 around the 3.7 mark in LC2 cars.

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