Kain

I'm running 37* of timing at WOT (so says the scan master). I'm getting tired of swapping out to another PCM that runs 32* for the bottle.

I'm only running a 100 shot (52n + 35f jets). I've got NGK TR6's for plugs. I was just wondering what kind of added risk of predetonation would I run with the 37* vs 32* timing programming.

Thanks!

Statistics: 95 Camaro Z28, two-tone - silver with black hardtop, A4 originally 2.73, black leather, power everything.

Performance: Hooker Super Competition long tube headers, two 3” Flowtech cutouts right after the headers, custom y-pipe from Meineke, Precision Industries Vigilante 3200 stall torque converter with 2.5 STR, TransGo shift kit with 3 washers, B&M transmission cooler, Strange 3.73 gears for a 2 series carrier, custom 3” cat-back and exhaust turn-down after a Flowmaster Delta Force Race Muffler (single 3” in, single 3” out), K&N FIPK, 52mm BBK throttle body, www.pcmforless.com programming with AKM Electronics cable, Bosch Premium spark plug wires, NGK TR6 spark plugs, Performance Friction Z-rated brake pads, Power Slot brake rotors, Hypertech 160 thermostat, off-road pipe, LT4 knock module, Stage 8 locking header bolts, Taylor high temp 1200* spark plug wire sleeves, two 24” inch O2 extensions, 1LE intake elbow, removed AIR pump, performance shift mode mod, fan switch, first gear mod, free ram air.

Kain

Comon guys, someones got to have an idea. I got to run a 03 Cobra tomarrow, and I need to know.

Injuneer

What you are asking us to do is tune your car over the Internet??? I personally wouldn't approach it that way...

Since you have a ScanMaster..... when you run 32deg advance on nitrous, do you get any knock retard? Ever? If not, you could probably put in a little more timing, but I wouldn't put it all in at once. Add a degree or two to your nitrous tune and see if you get any retard. Allow for the fact that there are a lot of variables that affect detonation, including inlet air temp, coolant temp, fuel quality (not always the same, no matter what it says on the pump), bottle pressure, whatever. I doubt you should have a problem with a 100-shot, but since you have the ScanMaster, use the info it can provide.

I would rather run a conservative tune I know is safe, than one that puts me on the ragged edge, and could turn bad if one or more of the variables goes in the wrong direction.


Use this advice at your own risk... .

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Fred
94 Formula A3: 381/TH400/N2O
Detailed Mod's List
11.513@115.59 on motor; 11.162@127.67, 1.643 60' on a 125-shot. Going with a 275-shot this year

[This message has been edited by Injuneer 94FormM6 (edited June 30, 2002).]

MichiganSkip

Come on Fred!! everyone knows that these Chevies run their best on the ragged edge of detonation!!!
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

George Debski

Hey Fred,

How's about 33degrees with a 200 shot on a 7 year old stock bottom LT1 with the knock sensors disabled, 93 octane, and running it to 6500



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SSMOKEM

1995 Impala SS "Cherry Bomb"
Best ETs: faster than my '65 pickup
Mods: 93% stock

My Super Impala SS Website

MichiganSkip

Seems to me that my carbed car ran about 36* total at 3000 rpm but that was N/A. Any more and the car lost power. NOS and most everyone else claims that 2* should be pulled for each 50hp of N2O. Maybe you should buy LT-1 edit or Tunercat and flash a file that pulls timing at WOT above 3000 or so. Easy enough to change out when you're not at the track. But 37* seems a little steep for 100 shot of N2O. Like Fred says... better to err on the side of caution!!! Your motor will love you
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