Supercharger pulley size & CAI

[Meerology]

Hi guys, for a 2014 GT500 which size supercharger pulley do you recommend and JLT CAI 123 or 148?

My setup will be as follows:
Twin 65mm Throttle Body
10% lower pulley

Will I need to change the spark plugs or injectors?
Whats the max hp stock engine can handle?

Thanks in advance

 

[Turbo98GT]

Who is your tuner?

I would go with the JLT Big Air (127mm) and 2.39" upper pulley from Billet Pro Shop

Personally, I'd go 2 steps colder with upper and lower which is NGK Tr7ix

In the end, ask your tuner first.

 

[VNMOUS1]

Hi guys, for a 2014 GT500 which size supercharger pulley do you recommend and JLT CAI 123 or 148?

My setup will be as follows:
Twin 65mm Throttle Body
10% lower pulley

Will I need to change the spark plugs or injectors?
Whats the max hp stock engine can handle?

Thanks in advance

Do NOT use the 148mm. For your car, use a 2.40 (with the stock lower) and a JLT127. The 148 is too big for your application to allow us (or anyone else) to have enough resolution (tuning data points) at low speed so driveability suffers. We use the JLT123 up to 800 rwhp.

If you're going to use the 10%, don't go beyond a 2.50 and at that you need an injector upgrade, I would suggest a fuel pump booster and a bunch of octane (minimum 93/98RON).

Take a look at our 13-14 section and if you have any questions, just shoot me an email directly if I can assist.

http://vmptuning.com/2013-shelby-gt500/


bj