my number 1 hater

iTrader: (4)

Just got tunercats for my LT1, 94 M6, hot cam, 150 shot compucar wet plate (new FPR, 255 walbro). Fuel pressure 43psi. My stock max advance table is 46 deg. When the nitrous hits it revs smooth till 5000 then detonation. So i pulled 6 deg via the tunercats (max advance) And it did a little bit better, now detonation at 5500. I just cant see pulling more timing, 2 deg for every 50 HP.

Now my questions: What is the stock max advance? How much timing should i pull for a 150 shot. How Much is to much timing to pull. Am i pulling the timing from the right table (MAX ADVANCE)?

bowtienut

iTrader: (1)

No. "Max Advance" is not a table; it's an ECM constant that has no effect on what your doing.
You need to go into these TWO tables:
"Main Spark Advance vs. RPM vs. MAP" and
"EXtended Spark Advance vs. RPM vs. MAP".
Reduce the 4 right hand columns (85 through 100 Kpa) by 6 degrees in both tables.
Tell us what the highest number is in the two righthand columns (95 and 100kpa) before you make the correction.

my number 1 hater

iTrader: (4)

ESA vs RPM vs MAP 95 38* AND 100 38*

MSA vs RPM vs MAP 95 35* AND 100 38*

Thanks for the help.

bowtienut

iTrader: (1)

That doesn't sound like a stock table to me.
It appears there's about 3 or 4 degrees more than typically seen even on a good dyno or mailorder tune.
You'll need to pull about 10 degrees out of the 95 and 100 kpa columns for a 150 shot, so the max you see is around 28 degrees anywhere above the rpm your shot comes in. Where does it come in? Are you using a window switch? What plugs are you running? gap?
The 90 kpa column can be a degree more and the 85 deg column 2 degrees more.
Make those adjustments, and then post of screen shot of the tables if you can, and we'll take a look.

my number 1 hater

iTrader: (4)

Thanks for the help and info so far. Here are the tables you asked for. And this is after i pulled 6* of timing from the tables you said too. NGK 3177s BR6EF gap 37. No window switch. The spray comes on at WOT, but i wait till 3000ish to put it to the floor off the line. I do have a Mallory 667c IGN box with control, not installed yet.

Extended Spark Advance Vs. RPM Vs. MAP

RPM MAP (Kpa)
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 39.0 39.0 38.0 38.0 31.0 29.0 29.0 27.0
4500 35.0 41.0 44.0 44.0 43.0 42.0 41.0 40.0 40.0 40.0 39.0 38.0 31.0 29.0 29.0 27.0
5000 35.0 41.0 44.0 44.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 38.0 31.0 29.0 29.0 27.0
5500 35.0 40.0 44.0 44.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 38.0 31.0 29.0 29.0 27.0
6000 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 40.0 40.0 39.0 38.0 31.0 29.0 29.0 27.0
6500 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 41.0 41.0 39.0 38.0 31.0 30.0 30.0 30.0
7000 35.0 40.0 44.0 44.0 43.0 42.0 41.0 41.0 41.0 41.0 41.0 41.0 34.0 32.0 32.0 32.0


Main Spark Advance Vs. RPM Vs. MAP

RPM MAP (Kpa)
25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
400 21.0 23.0 23.0 24.0 25.0 26.0 24.0 24.0 20.0 20.0 18.0 14.0 5.0 1.0 0.0 0.0
600 24.0 24.0 27.0 30.0 30.0 29.0 27.0 25.0 24.0 21.0 18.0 16.0 7.0 4.0 2.0 0.0
800 27.0 31.0 32.0 33.0 33.0 32.0 29.0 26.0 25.0 22.0 19.0 16.0 8.0 5.0 3.0 2.0
1000 32.0 38.0 39.0 36.0 34.0 33.0 31.0 29.0 26.0 23.0 20.0 16.0 8.0 5.0 4.0 4.0
1200 34.0 40.0 39.0 38.0 37.0 35.0 34.0 33.0 29.0 25.0 22.0 18.0 10.0 8.0 6.0 6.0
1400 35.0 40.0 41.0 40.0 38.0 36.0 35.0 34.0 32.0 28.0 25.0 22.0 14.0 11.0 8.0 8.0
1600 35.0 41.0 41.0 41.0 41.0 38.0 37.0 35.0 34.0 31.0 27.0 23.0 14.0 12.0 10.0 10.0
1800 35.0 40.0 43.0 43.0 41.0 39.0 38.0 37.0 36.0 34.0 30.0 26.0 17.0 15.0 13.0 13.0
2000 35.0 40.0 43.0 43.0 41.0 40.0 39.0 38.0 37.0 35.0 31.0 28.0 19.0 18.0 17.0 17.0
2200 35.0 40.0 43.0 43.0 42.0 40.0 40.0 39.0 38.0 37.0 33.0 31.0 22.0 22.0 21.0 21.0
2400 35.0 40.0 43.0 43.0 42.0 41.0 40.0 39.0 39.0 37.0 35.0 34.0 26.0 25.0 24.0 24.0
2800 35.0 40.0 43.0 43.0 42.0 41.0 40.0 39.0 38.0 37.0 36.0 35.0 29.0 29.0 28.0 27.0
3200 35.0 40.0 43.0 43.0 42.0 41.0 41.0 40.0 38.0 37.0 36.0 36.0 29.0 29.0 28.0 27.0
3600 35.0 40.0 43.0 44.0 43.0 42.0 41.0 41.0 39.0 38.0 37.0 37.0 31.0 29.0 29.0 27.0
4000 35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 39.0 39.0 38.0 38.0 31.0 29.0 29.0 27.0

my number 1 hater

iTrader: (4)

sup anyone

WS Sick

The control box will do wonders for you, I ran one in my old car (355, ported heads, cam, 150 wet shot) and I ran a colder set of plugs and dialed the **** back -6 degrees, did not touch the computers tune and I never detonated.

Tony Shepherd

iTrader: (4)

Sounds to me like your blowing the spark out. Lower the spark plug gap to around .028

my number 1 hater

iTrader: (4)

This weekend the box gets installed

my number 1 hater

iTrader: (4)

It should be hard to do that with the plugs im running, but even my oldman said that it was blowing the spark out. Crap bro, i hope you are right and a simple plug gap fixes it. But im NOT telling the oldman he was right again.