Tune/Timing - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
 
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post #1 of 3 (permalink) Old 06-13-2014, 12:08 AM Thread Starter
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Tune/Timing

Recently I got a tune and was seeing WOT spark retard above 3,800 rpm that wasn't there in the stock tune. I got the stock main & extended timing tables put back in and kept the other tweaks in the "tune" for the increased performance in DD'ing conditions. Spark retard is much more reasonable now but I'm still seeing some and STILL seeing 2-3* more timing advance over stock in Datamaster running the "tune". I checked using tuner cats and the "tune" does have the stock main & extended timing tables untouched. The 100% stock tune shows 35* total timing @ WOT above ~5,200 in Datamaster. Using the stock timing tables, the "tune" shows 37* total @ WOT above ~5,200 rpm. I want to get it back to stock 35* total WOT. After checking everything I physically could on the car and trying different gas stations I'm thinking this car just does not like the additional timing above 3,800 rpm.
Before I do anything, am I right to start adjusting the timing by using the main & extended timing tables in tuner cats in the correct rpm/KPa ranges?

1994 Z28 4l60e- B&M trans cooler, Yukon 3.42's, Tune, 160 stat, TB Bypass/Airfoil/1LE Elbow/K&N CAI, FlowMaster Cat-Back.
Suspension: Strano Springs & Sway Bars, Bilsteins, SFC's, LCARB, Founders Performance STB & Adj. PHB
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post #2 of 3 (permalink) Old 06-13-2014, 12:35 AM
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yeah just tweak the timing tables to get the right results in the areas you're getting knock.

there's additional power enrichment spark added, but nobody has ever figured out from where, or how to modify it.

a bit conservative on timing in that range is a good thing; if you hit any knock retard, it'll take out a TON more timing than it needs, and you'll lose a lot of power, whereas if you just ran 1-2 degrees less than ideal you'd never notice.
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post #3 of 3 (permalink) Old 06-14-2014, 01:01 AM Thread Starter
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^Got ya- Thanks.


Quote:
Originally Posted by steveo View Post
there's additional power enrichment spark added, but nobody has ever figured out from where, or how to modify it.
I saw a stock LT1 corvette timing table and it was more aggressive than the Camaro's. It showed 35* total advance @ WOT in the tune. So they were probably running closer to 37* bone stock in reality. I wonder if that's at least part of the stock power difference GM claims between the two LT1's.

BTW steveo did you sell your LT1 Camaro or just park it for a while?

1994 Z28 4l60e- B&M trans cooler, Yukon 3.42's, Tune, 160 stat, TB Bypass/Airfoil/1LE Elbow/K&N CAI, FlowMaster Cat-Back.
Suspension: Strano Springs & Sway Bars, Bilsteins, SFC's, LCARB, Founders Performance STB & Adj. PHB

Last edited by MTs9428; 06-14-2014 at 01:10 AM.
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