Fuel Pressure and Rev Limiter on Nitrous
Thread Starter
Launching!
Joined: Jun 2002
Posts: 221
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From: Orlando, FL
Fuel Pressure and Rev Limiter on Nitrous Alright... finally got the nitrous setup DONE.
And by done... I mean it aint moving for a while.
Got the fuel pressure gauge, fuel pressure safety switch, etc...
Now... Im spraying a 150 shot from a Nitrous Works kit.
Previously, I was spraying a 100 shot with the nozzle that came with the kit. Upgraded the nozzle so it would flow up to a 175 shot. Then I decided to move all my solenoids and rewire the system to clean it up. Got all that done, installed a FPSS to make sure fuel pressure doesnt drop below 50psi (it's actually set right too) and a fuel pressure gauge to monitor fuel pressure.
Now... I am worried about air / fuel ratio. It tends to normally run rich. Question is... if the fuel pressure runs at what it should (above 50psi at WOT) should I have any fuel concerns with the recommended jettings?
The questions come because I am getting some surging while on the nitrous, as well as smacking into the rev limiter, which I dont see as being a HUGE problem because fuel pressure doesnt drop below 50 psi, and it only hits once going into third gear.
I am planning on getting some programming done as a shop locally is offering minor programming for $65, which doesnt include engine parameters. I am planning on lowering the shift point by 1mph and also raising the rev limiter up to 6500 to ensure no problems with that. In addition, I am also scheduling a dyno day for a car club I am a part of, so I would be able to check A/F on a wideband O2 sensor.
Does this sound like an accurate way to fix the problem and remove any more problems?
And by done... I mean it aint moving for a while.
Got the fuel pressure gauge, fuel pressure safety switch, etc...
Now... Im spraying a 150 shot from a Nitrous Works kit.
Previously, I was spraying a 100 shot with the nozzle that came with the kit. Upgraded the nozzle so it would flow up to a 175 shot. Then I decided to move all my solenoids and rewire the system to clean it up. Got all that done, installed a FPSS to make sure fuel pressure doesnt drop below 50psi (it's actually set right too) and a fuel pressure gauge to monitor fuel pressure.
Now... I am worried about air / fuel ratio. It tends to normally run rich. Question is... if the fuel pressure runs at what it should (above 50psi at WOT) should I have any fuel concerns with the recommended jettings?
The questions come because I am getting some surging while on the nitrous, as well as smacking into the rev limiter, which I dont see as being a HUGE problem because fuel pressure doesnt drop below 50 psi, and it only hits once going into third gear.
I am planning on getting some programming done as a shop locally is offering minor programming for $65, which doesnt include engine parameters. I am planning on lowering the shift point by 1mph and also raising the rev limiter up to 6500 to ensure no problems with that. In addition, I am also scheduling a dyno day for a car club I am a part of, so I would be able to check A/F on a wideband O2 sensor.
Does this sound like an accurate way to fix the problem and remove any more problems?
Re: Fuel Pressure and Rev Limiter on Nitrous If Its surging on a 150 and was not surging on a 100 I am willing to bet your FPSS is cutting it out momentarily. Especially with the FPSS set at 50 psi. Definately get to a dyno with wideband o2 and see what your getting for AF ratio. You may have to bump the FPSS a tad down as long as your not going lean.
<small>[ December 21, 2002, 07:51 PM: Message edited by: 383LQ4SS ]</small>
<small>[ December 21, 2002, 07:51 PM: Message edited by: 383LQ4SS ]</small>
Re: Fuel Pressure and Rev Limiter on Nitrous is this dry or wet? if wet rev limiter is BAD very BAd..thats what causes puddling and backfires. As far as surging, its usually low bottle pressure(ie RICH) or FPSS shutting it down. If the o2's are reading rich and the bottle pressure is over 950 or so, lower the setting on the FPSS.
