Big problem with my power dyno numbers

[mazspeed]

Ok, I went to the dyno tuning session today and here is my problem, and here are my numbers. At the wheels I got 350ft pounds and 340hp. I spent 20k on Frank's advice on this supercharger setup and at 9 pounds of boost I gained 0 horsepower over what a stock zz430 would make. This too me is VERY unacceptable. The numbers as far as timing and air to fuel is perfect now, but these numbers are not nearly what they should be. I drove the car today, and it didn’t really feel any faster then my straight zz430 setup. What the hell do you guys think the problem might be? Can you tell I'm pissed?

[907rs]

Is the motor actually seeing any boost?

[mazspeed]

Originally Posted by 907rs

Is the motor actually seeing any boost?

Yes, 9 pounds in the carb hat.

[907rs]

I'd be talking to the guy that built the motor. You've got something wrong there.

[mazspeed]

Originally Posted by 907rs

I'd be talking to the guy that built the bottom end. You've got something wrong there.

The engine was built by Campbell Auto Restoration. What do you think the problem might be? I was told that since the air inlet on the supercharger is close to the headers and that there is no intercooler, that we should pick up a bunch of HP, but that they said that doesn't explain the large amount of loss.

[907rs]

It could be a number of things.

[69bird]

Just for kicks why don't you try disconnecting the blower and see how it runs? I have a p1sc procharger on a 350. I havent dynoed it yet but Im sure im in the 450-500 range. What was your afr at? Timing?

[camcojb]

Originally Posted by mazspeed

Yes, 9 pounds in the carb hat.

you don't measure boost in the carb hat; you need to measure it in the intake, somewhere after the carb blades. My guess is you're not running anywhere near that boost level, at which point you'll need to figure out why.

A couple questions. What size air cleaner? Is it mounted directly to the blower or does it have some sort of intake tube? What pulley size? What blower? What timing at WOT? What A/F at WOT?

Don't panic yet, once we get it sorted out you'll be very happy with your choice.

Jody

[mazspeed]

Originally Posted by camcojb

you don't measure boost in the carb hat; you need to measure it in the intake, somewhere after the carb blades. My guess is you're not running anywhere near that boost level, at which point you'll need to figure out why.

A couple questions. What size air cleaner? Is it mounted directly to the blower or does it have some sort of intake tube? What pulley size? What blower? What timing at WOT? What A/F at WOT?

Don't panic yet, once we get it sorted out you'll be very happy with your choice.

Jody

Hey Jody. Ill need to pick your brain. The air cleaner is mounted on the supercharger itself, no intake tube. The size of the aircleaner was in the mid range due to clearence issues. It's a P1SC blower, not sure of the timing, but timing changes did nothing for power, and did not hurt power. I thought that was weird myself, but they advanced it 2/3's per pound after going down 1 degree per pound, or something like that. I'm not sure of the A/F. We took the carb hat off and it blows well into the engine, this is all I know.

[TOM NELSON]

340 to the ground is probally about 460 hp.I would check a couple of things one do you have 9 pounds in the manifold at your peak rpm serpentines will slip and if it does the car will feel soft as hell.Two with 9 psi even on a 8.5 to 1 350 with the hot cam you should be making at the very least 580 hp crank and you would definately feel that.I'm not sure if you said your transmission but if it's a auto are you sure it's not sliping,just a thought.Run a compression check on all cylinders see if there within 10 percent of each other and at least 110 pounds cranking.If you have that than i doubt it's in the motor.I've had problems with the procharger units I actually have not used your blower before though but in the past there smaller blowers just did not cut it.I had a 383 with a blower i believe was similar to yours lay down 310 to the ground.We changed pulleys you name it.Not big improvements .Switched to a ysi vortech it picked up 400 hp.and made 710 to the ground and the cam was much smaller than your hot cam.I had good luck with there bigger units like the f2's but even there above 10 psi they really start making heat fast.Ignition Timing can be a huge deal on a 8.5 to 1 motor I've seen 100hp from 25 to 35 degrees the low compression engines like timing at 9 psi and only 6000 rpm But beware carbs timing and boost is a scary deal.If it was mine and i felt good about the tuner i would not shy away from 35degrees total timing at 9si and 6000 rpm this can literally transform the engine.Again beware creap up on it.I would for ****s put some 110 in it and put total at 35 dgrees and see what happens given afr's are in the high 11's low 12's.Hope you fiqure it out