Problem with my Head/Cam 98 LS1 camaro - files attached

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Second pass on tune 0008

Sprayed off the line to about mid 2nd then turned kit off. Spun off the line but didn't pop or make any noises.

VIdeo: http://www.youtube.com/watch?v=XlNwYxbYoxc

Log attached

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OK ... the 1>2 shift is the most difficult to tune - it is easily made too harsh. Lots of "room to move" on the shift pressures of the 2>3 and 3>4 shifts.

I generally use a TransGo HD2 shift kit and upgraded servos in all 4L60 transmissions - may (or may not) shift similarly to your "built" transmission.

Will try and repost your tune (hopefully tomorrow) with modified 2>3 and 3>4 shifts - intended as an example of options, not intended as a "will work for you" tune.


Regards,
Taz

I really like how crisp and hard 1 >2 shifts. Seems like my car took longer and was much softer in 2 >3. I hardely ever stay in it long enough for a WOT 3 >4 shift.
I have a TCI Super Street Fighter 4l60e. Not sure what all they do to them, but the orig owner paid 4k for it.. lol. I would have went TH350 or 4l80e before spending that much

[WeathermanShawn]

Well at some point, somebody really modified your High-Octane Spark Table.

If you look at the Spark Values from .60 g/cyl -1.20 g/cyl+ they jump 30 degrees of Spark.

Thats not stock...

See in your log, you jump from 21-28 Spark (-4 MSD Box) at a very low Rpm. Normally you want Spark to decrease with additional cylinder load. Thats where you went Boom..

Is that your Spark Map, because your original tune says stock..

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Second pass shows commanded EQR 1.1309 which is almost the same as 1.129 in B3605... but wideband shows EQR 0.9520, something is wrong here.

Only have about 100 miles on the new Bosch wideband sensor for the innovate. Calibrated it twice. It may have went into that (sensor 8 timing error mode). THat innovate LC1 has never been consistent for me.

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Well at some point, somebody really modified your High-Octane Spark Table.

If you look at the Spark Values from .60 g/cyl -1.20 g/cyl+ they jump 30 degrees of Spark.

Thats not stock...

See in your log, you jump from 21-28 Spark (-4 MSD Box) at a very low Rpm. Normally you want Spark to decrease with additional cylinder load. Thats where you went Boom..

Is that your Spark Map, because your original tune says stock..

That was the tune that came in the car when I bought it. I didn't have any info on it other than when I downloaded it after first getting EFILive.
So you CAN see the MSD timing twister pulling time in the efilive logs?? thats good to know.

I though when I was looking over the log of the nitrous explosion the timing seemed REALLY high. So basically since the timing was so high from who ever tuned it before made it detonate even with the -4 pulled. Just weird that it didn't do that the pass before when I was on the kit. Maybe because I let out so early of the nitrous in second???

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Video of nitrous problem. Even after I turned the nitrous off you could still hear it popping down the track. In the log, at one point after I tirned the kit off I went 100% tps on motor hoping it would clear up and run him down. No such luck..

http://www.youtube.com/watch?v=bsXSWojH0Io

[WeathermanShawn]

I'm just trying to understand the Time line.

Sprayed on the orig tune 100 and 150 20-25 times only added a little race gas and never had a prob.

Are you saying you have had that Spark table in that long..or did you recently change it.

Your Spark went from 21-24 then KR, then Boom.

[WeathermanShawn]

See looking at that Spark Table, it was designed to never launch below 2200 RPM's.

Your launch and addition of nitrous was at 1652 Rpms (TPS 88%). Your CALC.Cylinder air was 1.30, which put your car at 28 degrees Commanded Spark. Stock is 18 degrees.

Now if you really ran that Spark table for 150 runs and never had trouble, perhaps you just got lucky. Thats a lot of cylinder pressure for that low of a RPM.

Maybe thats a nitrous Spark table, or someone got sloppy cutting and pasting values into it.

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I'm just trying to understand the Time line.

Sprayed on the orig tune 100 and 150 20-25 times only added a little race gas and never had a prob.

Are you saying you have had that Spark table in that long..or did you recently change it.

Your Spark went from 21-24 then KR, then Boom.

I haven't ever touched the spark table. I had made a bunch of nitrous problems on that same spark table with no problems. I didnt have the MSD box, so I added a couple gallons of 110 or 112 race gas. THis was with 100 and 150 jetting.

I bought the MSD timing twister and set it to retard 4*. So with the MSD pulling time and making so many nitrous passes with no problems. I ran it on just the MSD with timing pulled and pump gas. Car has a BAD nitrous explosion at the top of 2 going into 3. I though it hit the rev limiter, so thats what got me to buy efi live and change shift points.

http://www.youtube.com/watch?v=jUDHKXt8ylY

So the race gas was a crutch with all the timing the other guy had in the tune I guess? Obviously pulling *4 wasnt enough.

[WeathermanShawn]

Josh, I'm not sure. People do all sorts of things with Tunes with various rationals.

I'm just saying this would be like playing with dynamite. You can do it 100 times and get away with it, then one mistake and jumping to 28 degrees of Spark at 1600 Rpms is not standard tuning.

I just don't get why you would need to set-up a Spark table this way...