speedfreak391

iTrader: (2)

Ok, here is the question. I have a 2010 L99 car that I have just converted to ls3 with the LS9 cam, lifters and valve springs. I am almost done with the whipple install and then I will be installing the LPE twin mechanical pump setup (the one that runs off factory wiring without the controller. Injectors are ID 850's, with a cold air, and Stainless power headers and Full magnaflow exhaust. Planning to to get dyno tuned in a week.

My question is What pulley should I run to be safe on the street with? I have the stock 4.00, 3.75, and a 3.50. I am not looking for a dyno queen I could care a less about a big number. I want as much power possible but want to be safe at the same time.

Thanks in advance!

motion427

iTrader: (1)

It would depends on your fuel quality in your area.And your location(elevation). At Sea level,you would make more boost than let say you are at 3000 feet. The L99 has lower compression than the LS3. Some have push the stock LS3 to 15-17 psi with meth or race fuel. For long term reliability I would suggest in the 8psi range. I'd start with the biggest pulley to be safe. But I think you can run the 3.75 with no issues.

speedfreak391

iTrader: (2)

Whipple has told me to run the 3.5 with my setup.

Whippedss2

I am running the 3.875 and making 10Lbs @6500 with a 114 cam and 2" headers.

Whippedss2

On 91 Octane