vortec spark table - Page 2 - Third Generation F-Body Message Boards

liquidh8 · 05-09-2006, 08:44 AM

I used that SA table, and I needed WAY more spark for my combination. That was just for me. The slope seemed to be good, just wasn't enough spark. I added a bunch all over, and adjusted my PE SA and the engine really likes it, so it seems.

firstjohn26 · 06-24-2008, 10:23 PM

Quote:

Originally Posted by RBob

If someone finds a Vortec engine bin please post or PM me with it.

The best I've been able to come up with is the iron headed LT1 SA. This one is from a '95 B body car:

Code:

       400  600  800 1000 1200 1400 1600 1800 2000 2200 2400 2800 3200 3600 4000 4500 5000 5500 6000 6500 7000 
25 KPA  18   22   26 29.0 31.0 33.0 35.0 36.0 37.0 37.0 37.0 38.0 38.0 38.0 38.0 38.0 38.0 37.0 37.0 37.0 37.0  
30 KPA  21   25   29 30.5 33.0 35.0 38.0 39.0 40.0 40.0 40.0 43.0 43.0 43.0 44.0 44.0 44.0 43.0 40.0 40.0 40.0  
35 KPA  22   26   30 30.5 32.5 34.0 37.0 38.5 39.5 40.0 40.0 41.0 43.0 45.0 45.0 46.0 46.0 46.0 42.0 42.0 42.0  
40 KPA  21   24   26 28.0 30.0 31.0 34.0 35.5 36.5 38.0 38.5 39.0 41.0 42.0 43.5 45.0 45.0 45.0 41.0 41.0 41.0  
45 KPA  20   22   23 27.0 28.0 29.0 32.0 33.5 34.5 36.5 37.0 38.0 39.5 40.5 41.5 42.5 42.5 42.5 39.0 39.0 39.0  
50 KPA  19   21   22 25.5 26.0 27.5 30.0 32.0 33.5 35.0 36.0 37.0 38.5 39.5 40.0 40.5 40.5 40.5 38.0 38.0 38.0  
55 KPA  17   19   21 24.0 25.0 26.0 28.5 30.0 32.0 34.0 35.5 36.5 37.5 38.5 39.0 39.5 39.5 39.5 37.0 37.0 37.0  
60 KPA  15   17   21 22.0 23.5 24.5 27.0 28.5 31.0 33.5 34.5 35.5 36.5 37.5 38.0 38.5 38.5 38.5 36.0 36.0 36.0  
65 KPA  12   15   19 19.5 21.0 23.0 25.0 27.0 30.0 32.5 33.5 34.5 35.5 36.5 37.0 37.5 37.5 37.5 35.0 35.0 35.0  
70 KPA   9   12   16 16.5 18.0 21.0 23.0 25.5 29.0 31.5 32.5 33.5 34.5 35.5 37.0 36.5 36.5 36.5 34.0 34.0 34.0  
75 KPA   6    9   13 13.5 15.5 19.0 21.0 24.0 27.5 30.0 32.0 33.0 34.0 34.5 36.0 35.5 35.5 35.5 33.0 33.0 33.0  
80 KPA   3    6  9.5 10.5 13.0 17.0 19.0 22.0 25.0 28.0 30.0 32.0 33.5 34.0 35.0 34.0 35.0 35.0 32.0 32.0 32.0  
85 KPA   2    2    6  7.0 11.0 14.5 17.0 20.0 22.5 25.0 27.0 29.5 31.5 31.5 33.0 32.0 34.0 34.0 31.0 30.0 30.0  
90 KPA   2   -1    4  5.0  9.0 12.0 15.0 17.5 20.0 22.5 24.5 27.0 29.0 30.0 31.0 31.0 31.5 31.5 30.0 28.0 28.0  
95 KPA   2   -2    2  4.0  8.0 11.0 13.5 15.5 18.5 20.5 22.5 25.5 28.0 29.0 30.0 30.0 30.5 30.5 29.0 28.0 28.0  
100 KPA  2   -2    0  3.0  7.0 10.0 12.0 14.0 17.0 19.0 21.0 24.5 27.0 28.0 29.0 29.0 29.5 29.5 28.0 27.0 27.0

The LT1 iron head and the Vortec head share many similarities. Should make a good start for a Vortec headed engine.

RBob.

Hey guys - very helpful discussion
I'm kinda new to spark tuning. I have a GMPP HO 350 (Iron Vortec heads, 9.1:1 CR, 212 degree intake / 222 degree exhaust @ 0.50") with the Holley Commander TBI setup. I started using this LT1 table, and it was way better than what I had. I was wondering what you'd recommend to go further in my case. I have no access to a dyno or dragstrip. Car is a daily driver, 79 Malibu wagon, 200R4, 3.73 posi). I use a wideband for fuel tuning, and the car hesitates going WOT at idle speed before it takes off. AFR is good.

Thanks, John

liquidh8 · 07-03-2008, 08:59 AM

John, similar to me. wagon, trans and gears. lol. I ended using quite a few different tables to get what I needed. I have a WB and been to the strip once with the set-up. Your hesitation may or may not be spark. You sure your AE is in line? If you have a WB make sure you aren't getting a lean spike, or a rich bog (a problem it took me forever to get rid of). Feel free to PM me.

Jim

w/t1500 · 07-03-2008, 10:18 AM

I've the complete calibration report for a 1998 L31 vortec.

W/T1500

JPrevost · 07-12-2008, 12:46 PM

Quote:

Originally Posted by firstjohn26

Hey guys - very helpful discussion
I'm kinda new to spark tuning. I have a GMPP HO 350 (Iron Vortec heads, 9.1:1 CR, 212 degree intake / 222 degree exhaust @ 0.50") with the Holley Commander TBI setup. I started using this LT1 table, and it was way better than what I had. I was wondering what you'd recommend to go further in my case. I have no access to a dyno or dragstrip. Car is a daily driver, 79 Malibu wagon, 200R4, 3.73 posi). I use a wideband for fuel tuning, and the car hesitates going WOT at idle speed before it takes off. AFR is good.

Thanks, John

Depending on your ecm, that hesitation might be a bug. The 7747 and 8746 code has an AE fuel issue at specific RPM's. I tried everything until RBob went through it and told me about the code "error".
If it's a consistent hesitation then it's not likely the code but the calibration. With the wet intake design you can get away with more advance at high kpa and low rpm because those area's are usually only "hit" when you snap the throttle open. Other times it's because you're pulling a stump out of the ground with an ultra tight torque converter... anyways, use the vortec table for the high kpa/load low rpm's that you're getting the hesitation. Then if that doesn't help, it's likely a fuel delivery issue. Try richening up the AE vs MAP at the high kpa, go with steps of 25%. What is tricky is that the code considers the AE pulse width referenced. In other words, your Holley might have bigger injectors and even with changing the injector constant, the AE will be more fuel because larger injectors open for the same amount of time flow more fuel. duh. I don't want to confuse anybody so what I'm about to say might be best ignored... but... when you want to control a cars fuel mileage with your foot, have the AE on TPS and MAP tables about the same. If you want the smoothest running engine, have your MAP AE approx double that of the TPS. I could go into greater detail but I feel it's not really worth it. For 99% of you guys just get it close and you'll be happy.

silvernblack · 07-13-2008, 12:16 AM

These were extracted from the MEFI by another fellow. Remember that the Ramjet 350 initial timing is set at 10°.
----------
gotta attach them...
here's the thread where I previously posted them:

http://www.thirdgen.org/techboard/di...rk-tables.html (Ramjet Spark tables)