Info of the car :

1985 corvette L98 /ecm/maf/everything transplanted into my camaro, New Walbro 307, 255lph Fuel Pump, AFPR, New 24lbs Multec LT1 injectors.

On gas, car runs like a beast..

I had a Compucar Street Heat kit that attaches in front of your MAF sensor to blow into the intake, but it killed my stock Bosch MAF sensor.. Since then I bought another one, and moved the NOS nozzle between the MAF and the Throttle Body.
I also got a Pressure Reducer regulator and vacuum tee from NOS, which goes inline of the nitrous to kick the fuel pressure regulator up as the nitrous is flowing in the engine.

NOS says to put a jet in the vacuum tee fitting which goes back to the vacuum connection on the intake, but when I did that as they recommend (.042 jet) the car stalls when I'm testing it at idle, seems like the afpr is getting too much pressure into it form the tee fitting. When I do not put any jets in there, the car doesn't stall during the test. (Of course I don't have the Nitrous directed into the engine during testing at idle )


Everything hooked up right, double and tripple checked it..
Went on the highway, Fuel Pressure at 47/48psi
(Higher than normal which is 42psi, but that's due to the vacuum missing on the AFPR now, as the Nitrous pressure regulator tee is hooked up)..

When I hit the nitrous, the car gets a kick in the pants for a few seconds, then stumbles for a moment and accelerates again.. I am only testing a 50HP shot right now, but this is odd.. I can't figure it out..the Fuel Pressure shoots up to 57psi when I was on the juice on the highway.

Anyone any ideas?

 

the pressure is supposed to rise thats where the fuel comes from. does the fuel spike as the car bogs then go down to a 57 psi level?

 

It only seems to shoot to 57psi and stay there.

 

it may be a problem of not enough fuel, if it detonates on tip in then the ESC sensor may be pulling a pile of timing out in response. be careful, not knowing what you are doing, and since dry kits are a voodoo not a science. Regular wet kits are a science that uses specific metered amounts, you must be careful with your new toy on your old one.

 

going off what he said, and this is a THEORY...

try moving the n2o nozzle farther away from the engine...

heres my theory why:


the n2o hits the engine a sec before the AFPR and the pump can bump up the pressure. so what happens is the engine pings... the computer pulls the timing way out, then the fuel is there, and it doesnt ping anymore, so you're on the juice, and then it all starts working again....


thats my idea atleast..

in anycase, i would rather be sure that the engine is getting fuel before n2o no matter what.

 

I know wet kits are safer then dry ones, but since I am planning on a superram setup in the VERY near future, and I have heard too many problems with running wet kits on that intake, my only option is a dry setup. I am not getting detonation though.. I am quite familiar with the sound. Also another reason I put in th eengine from an '85 corvette is that it has forged internals, not the cast crap normally..

 

That is a good idea... I'll test it by retarding my timing to '0' to make sure I am not getting any ping at all ( I am at 5 degrees now.)