2.9 Whipple advice

[ARBOC1]

I am running a 2.9 Whipple with crusher kit. Right now I'm running the pulley that came with it, a 3.50 I think. I'd like to run more boost. I'm at 19psi right now. What size of pulley should I run to get closer to 22-24 psi?
*Note that I have only 91 octane where I am at.
I am not running any upgraded idler pulleys right at this point
I am running 591 RWHP with the current set up

Also what is the maximum horsepower you can run with the stock engine? I've heard 600 to 750

 

[cobra fern]

In order for you to run that much boost you need more then 91 octane . You have to run race fuel . Invest in meth injection and you can get more power on pump gas as you can add a little more timing. IMHO I think the 2.9 whipple with a crusher Inlet is too big for a street car on pump gas . Whipple 2.3 would suite you better . 2.9 need to be spun hard to get them to work and then you need race gas in your car . Not the best decision for a street car imho

 

[caaron101]

E85!

 

[1S1K]

You are at the max for 91 octane at 19lbs boost. I would say for even 93 octane that would be the max. Check out my sig for pulley and boost numbers.

 

[stangfreak]

Because you are running 91 octane, I bet you have a super safe tune. 19lbs on a 2.9 whipple you should be blowing away 590rwhp. Im at 22lbs of boost, but I run vp100. Im making 710rwhp and 650rwtq. also keep in mind my car, since day one, always had a soft motor. Im actually down 20hp 20tq.

These blowers need good gas and need to be spun. 91 octane I would have picked a smaller blower. 19lbs is a good start for the 2.9. You need to change over to e85 or race gas.