How much boost / what size pulley can I safely run without modding my engine? It's a stock LQ4 with a Radix.

 

I am running a 2.8 pulley making 9.5 psi on pump gas.....

What all is done to the motor?

 

i have heard that 2.9 is as high as you should go on the LQ9

 

This is true....the LQ9 is a higher compression motor.

 

Why not wire up an alcohol injection kit and go higher??

I see a ton of people that are limiting themselves because of air temps coming from the blower when they can easily add a meth kit and run at least 3+lbs more boost.

I am having a kit custom designed for my truck and it is only around $500.

 

does that mean the LQ4 has potential for more?

 

Yes and no.....There is potential there, but not for more boost!

 

hmmm, you have my attention.....

 

I have stock internals and tuning by Lyndon, I don't want to do too much because I want to keep the warranty. I'm having a stealth stall installed and a shift kit, but I've refrained from headers and cam because I'm pretty sure it'll void my 5 yr powertrain warranty. The dealer is cool with the blower. I have a 3.1 pulley, I figure boost and tuning is pretty cheap. I'm looking to Brian for a good deal on a pulley. And then save some $$$ for a rebuild.

How much boost would I would be running with a 2.8???

 

With the 2.8 I see 9.5 PSI. The only problem is these pulleys are hard to find