I am going to use the OBDI computer to retard the spark for the NOS. I am going to retard the timing in the Traction Control Table. I am going to use the input for the trcation control to trigger the computer to retard the Timing. My question is How much timing to pull out. The stock computer will pull timing out every 1000 RPM. I can pull out a little timing out every 1000 RPM. I am going to turn the NOS on at 3000 RPM and Turn it off at 6100 RPM. I have a TNT nitrouse kit(WET KIT). I will be shooting it with 100HP. I have to figure out how much timing to pull out at 3000, 4000, 5000, 6000 RPM. Does anyone have any suggestion? I know pulling timing out this way sounds strange, but it should work better. Thanks for all the input!

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KYLE P. DAY-SERGEANT USMC
97 Trans Am with minor mods.
EMAIL: dayusmc@marinecorps.com

 

I retard the timing 2-3 degrees per 50 hp, this is a normal amount.

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Scott Parkinson
2001 Sunset Orange Z-28
SLP Loud Mouth Cat-Back Exhaust, LS1 Motorsports Intake Bellow, K&N Filter, MTI Clear Air Lid, Mass Air, 160 Thermistat, Power Programmer, 8.5mm Plug Wires, BMR Sway Bars, BMR STB, Competition Engineering Frame Ties, Lakewood LCA's and Panhard Rod, 125 hp Shot. Runnin low 12's all day.

 

I dont pull any timing for a 75 or 100 shot. I usually pull 1-2 degrees for 125 just to be safe, however I have run 125 a few times without timing pulled (I can adjust it from the driver seat) and have never had a problem.

I have messed with pulling timing on the 75 and 100 shot just to see what happens. I think I actually lost power when I pulled timing of those shots.

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`96 TransAm: RamAir w/ K&N filter, 125hp Zex dry kit with all the extras, 3.73 gears, McLeod StreetTwin clutch, Borla cat-back, 1le alum. driveshaft, B&M shifter, Walbro in-line fuel booster pump, Granatelli MAF, 52mm TB w/Airfoil and coolent bypass, LT4 KM + programmed computer, Accel 8.8 race wires, NGK TR6 plugs, MSD Univ. Adj. timing, Window switch, Sport-comp Nitrous, Boost, Fuel pressure gauges in center 3 vents and Air/Fuel gauge on A-pillar pod, Mobil 1 only, !CAGS, Yokohama tires, tinted windows.

Low 13's on motor.
Low 12's on bottle.
"Lots of throttle and a backup bottle"
UPDATE(8-02-02) Moser 12 bolt is here.

 

Some guys with stock timing tables do not pull any timing on up to a 100 hit, if you have added timing to your pcm I would pull at least 2 degrees per 50 hp, to be safe.

 

Thanks for the reply Guys! I noticed that some of you are running window switches. When do you turn the NOS on/OFF (RPM). Any other Tips?

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KYLE P. DAY-SERGEANT USMC
97 Trans Am with minor mods.
EMAIL: dayusmc@marinecorps.com

 

On no lower than 3k, and if you don't want to spray thur the shift, shut it off a hundred rpm before the shift point, keep in mind your oem tachs are off, normally a few hundred rpm high. The pcm, trans and window switch should all see real time rpm.

 

Is it better to spay through the shift or shut off before the shift?

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KYLE P. DAY-SERGEANT USMC
97 Trans Am with minor mods.
EMAIL: dayusmc@marinecorps.com

 

Youll have better preformance spraying thru the shift points .....downside is wear and tear on the tranny.

As far as retarding timing with the traction control table goes, it sounds interesting but I dont see any advantages in doing it that way as apposed to the more direct way of pulling a couple of degrees in then Spark advance v rpm v map tables in the 3000+ rpm / 95kpa range.

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Greg
95 Z28 conv M6
Georgia F-Body Association

Stage 1 heads, 1.6rr, Meziere WP
lt4 hot cam,lt4 timing chain kit,52mm TB,
Hooker Headers, Pro 5 shifter,3.73s,
NX 150 progressive,
Self-tuned via Tunercat

 

You might first log some runs with the timing set where it is now. On my car the PCM retards timing itself.(Not sure why) when I'm running N2O. Doesn't retard any off the spray. Just a thought.
Skip

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Michigan Skip's Flamed 95
95Z28, K&N TPIS 150hp NOS & 27mpg!
MSD 6AL, Window switch,Ford SVO 24# injectors,
2.73's (3.42's to come) Edelbrock headers, Flowmaster exhaust
BMR SFC,LCA,STB