Help LOW BOOST !

About 2 weeks ago I installed A 4.5 unit on my 1996 Camaro Z28 9 (OBD2). I had a Lean problem THE HIGHER THE RPM THE LEANER IT WAS GETTING ( 4700 RPM WAS GETTING 14 TO 15 AIR FUEL ). ( but think
I have resolved it...Computer was reprogrammed in 1998 to lean out Engine...so I installed another computer , this time a STOCK computer, also installed an Accell External fuel pump under drivers side ).

My question to you is how much boost should I be running ?? I kinda bring the car up to red-line 4600 to 5000
RPM in 2nd the 3rd gear, but the BOOST only goes as high as 2 to 3 and a half PSI. Do I really Need to BEAT on the car
to see High BOOST Levels ?? Do I need to be in 4th Gear Hauling butt to see Boost ?? Is that Normal ?? Still think I have
a Lean Problem ??

I just ordered a New MAF ( Supercharger Tuned ), I also Just ordered a New Hypertech Computer Programmer. The Reason I'm getting a new MAF is, the NEW STOCK COMPUTER is showing a Check Engine Light. I check out the Code with my Akron Code Reader it said P0100 ( MAF)...Tried to clear code.No luck ...Did the Battery disconnect ...no good. Could this Bad MAF also be Leaning out the Car? Could this also be the reason why I'm not making my 5 PSI Boost ??? Please Help !!!!!! What would be a reason a supercharger would not make the Boost it's supposed to ????

This is a List of my Mods :


1996 BLACK Z28

4.5 psi POWERDYNE SUPERCHARGER

Granatelli MAF, MECH-TECH Reprogrammed Computer, Air foil, JBA Headers, Random tech Y pipe+ High Flow Cats, 3 inch Magna flow Cat-Back, MSD 6A, Taylor 409 10.4 mm wires, Dual Centerforce Clutch, Hurst T handle, Hurst Short throw Shifter, 106* Thermostat, Coolant by-pass, Water Wetter, Gel Battery, Accell High Volume Fuel pump, RED LINE OIL in Power steering and Rear Differential, Cross Drilled Rotors, Kumo 255-50ZR-16 Tires, HIGH POLISHED stock Rims, Rear Black-Outs, Strut tower brace, G-Load brace, Panrod bar, Bilstein shocks and struts, Skip Shift Eliminator, Polyurethane Tranny Mount, Underdrive Pulley Set, High Viss Fog Lights, Dual Pillar gage, Air-Fuel / VDO 0-15 Boost Gages, Pioneer Premier Stereo. 121,000 Miles....

Thanks for your Help !
:confused: :confused: :confused:

Boost it RPM dependent.... Rev it out more. Should be able to go to at least 5800. (just make sure it isn't leaning out)

Also, you have headers and what not. Your motor is flowing more air than stock, so there wont be as much air pressure (boost) built up in the manifold, with a pulley rated for 4.5# on a stock motor.

I'm not sure what a bad MAF would do ... but ... I suspect that if the computer determined the MAF was bad, it would put you into "limp home mode" and that is more fuel and less timing.

Assuming the MAF is replaced and is good to go, then at 4.5 psi of boost, the MAF will report to the computer how many grams/second of air it sees and the computer will dispense the appropriate signals to the injectors, you should not be going lean. If you get it on a wide band dyno and determine that you are indeed going lean, then you need to reprogram the PE curve to add more fuel on the top end.

You are seeing 3 psi of boost at 5,000 rpm, that sounds about right. You will need to take it to red line at WOT in order to see full boost. You may want to consider pulleying up a bit so as to make more boost at lower engine speeds. There is a guy on this board ... Canbufao ... is pretty close to his name ... he has a pulleyed up Powerdyne ... do a search ... yadda yadda.

I have more faith in the stock MAF than any aftermarket offerings.

Hope this helps

LWM

Cool Deal !! Thanks !!!! I do like the Powerdyne, Car does run well !! Thanks Everyone !! :bow: