nitrous help
Hello everyone, I have added a zex nitrous kit to my 99 ta. I have a 402 ls2 with a 239/242 cam. I want to spray a 180 shot. I have read that its better to place it after the maf. However I read that after install. I have it before the maf. I know I need to pull some timing before useing the nitrous. Can I get some help on where I would pull timing and how much? I have a wideband installed for doing this. Any info would be great!
do I use b5913 to set spark? for the nitrous?
Texas speed ls2 402, performabuilt 4l60e, 3600 stall,
Zex Nitrous kit, BMR Torque arm,BMR LCA'S, Relocation brackets.
best time all motor 11.8 with a 1.6 60' at 6800' DA.
Without seeing your set up it is hard to give any reasonable advice. Especially when playing with something that can easily kill your motor if done incorrectly.
First up is this a wet or dry shot you are spraying? Is your IAT sensor in the maf or seperate? Is the gas spraying before or after the IAT (if seperate from the maf)?
The Tremor at AIR
Sorry for not letting you know more info.. I have a wet nitrous kit, spraying before the maf and iat is in the air box so the nitrous sprays after it. the nitrous doesnt effect the iat I have looked at the log.. I took out 4 degrees and ran a log with nitrous it was at 13.9 afr. so I put in a bigger jet for fuel. went from a .033 to a .040 and now im at 13.3 afr. but no kr.
Texas speed ls2 402, performabuilt 4l60e, 3600 stall,
Zex Nitrous kit, BMR Torque arm,BMR LCA'S, Relocation brackets.
best time all motor 11.8 with a 1.6 60' at 6800' DA.
Wet shots go after the MAF... Dry shots go before the MAF and use injectors for fuel.
1999 Trans Am. 10.71 @ 126 - stock bottom end-
Can you post up your tune & a log? Spraying a WET shot before the maf should run way too rich not around 13 like you are.(Still way too lean)Originally Posted by blue99ta
Is the fuel solenoid fed from a stand alone tank or the fuel rail?
Ok I have been looking for a plate system to move the jets. here is my log but I dont have the lm2 connected to efi its a handheld.
Let me know if the tune is loading.
Last edited by blue99ta; July 6th, 2009 at 01:22 PM.
Texas speed ls2 402, performabuilt 4l60e, 3600 stall,
Zex Nitrous kit, BMR Torque arm,BMR LCA'S, Relocation brackets.
best time all motor 11.8 with a 1.6 60' at 6800' DA.
Why you shifting at 6300 rpm?
You dont need a plate system, just put the nozzle in the bellows facing towards the throttle body. I have a plate system.
Last edited by waterbug1999; July 6th, 2009 at 12:48 PM.
1999 Trans Am. 10.71 @ 126 - stock bottom end-
Having a quick look at your log shows a few problems that I believe you need to sort out.
First is that it appears you are setting a p0103 dtc when spraying. This will be caused from the maf measuring both the fuel & nitrous as airmass & hitting the upper frequency limit. To address this you will need to move the nozzle to after the maf, or tune in speed density.
Injector duty cycle is exceeding 100%. This may be due to a supply issue that has been tuned around or too small an injector. Since when spraying you also have the fuel jet running, and are still reading lean on your wideband, I would be looking at fuel supply.
I would also be getting your LM-2 set up to log in Efilive asap.
do you think I need to shift lower? That is where the guy at the dyno said i should shift.. any info would be great..
Texas speed ls2 402, performabuilt 4l60e, 3600 stall,
Zex Nitrous kit, BMR Torque arm,BMR LCA'S, Relocation brackets.
best time all motor 11.8 with a 1.6 60' at 6800' DA.
Posting Permissions
Reply With Quote