Ls7 / Ls3 Pull Timing
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Instructor
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Ls7 / Ls3 Pull Timing
I have heard that LS7 motors will pull timing after they reach 200 degrees operating temp....is this true and if so do LS3 motors also pull timing after reaching 200 degrees. thanks for the imput.
Melting Slicks
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From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Here's an example from HP Tuners showing how the timing gets pulled on my 07 once the ECT (Engine Coolant Temperature) surpasses 230 degrees:
Drifting
Joined: Feb 2007
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From: Alpharetta Georgia
LS2, LS3 and LS7 motors all pull timing after a certain temperature but the amount of timing it pulls as well as at what temperature can be modified in your tune.
Here's an example from HP Tuners showing how the timing gets pulled on my 07 once the ECT (Engine Coolant Temperature) surpasses 230 degrees:
Here's an example from HP Tuners showing how the timing gets pulled on my 07 once the ECT (Engine Coolant Temperature) surpasses 230 degrees:
Is that a stock table or have you modified it?
Melting Slicks
Joined: Jul 2007
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From: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Safety Car
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From: CHOCOWINITY NC
It's not only cooling you need to worry about. That can essentially be handled with a 160stat. IAT (intake) temps are also critical and timing starts to be pulled at a much lower temperature. Even with a front feed air system like I have (Car runs IAT at ambient as long as it's moving) you'll stil see timing pull as low as 86 degrees unless you adjust everythkng to the right with HP tuners....
Stock LS3 Table for IAT timing pull:
Stock LS3 Table for IAT timing pull:
Drifting
Joined: Jan 2008
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It's not only cooling you need to worry about. That can essentially be handled with a 160stat. IAT (intake) temps are also critical and timing starts to be pulled at a much lower temperature. Even with a front feed air system like I have (Car runs IAT at ambient as long as it's moving) you'll stil see timing pull as low as 86 degrees unless you adjust everythkng to the right with HP tuners....
Stock LS3 Table for IAT timing pull:
Stock LS3 Table for IAT timing pull:
Safety Car
Joined: Feb 2007
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From: CHOCOWINITY NC
Volume of air... You could Zero out the table but you'd run the risk of causing severe detonation damage in a high temp condition...The timing is pulled for a reason. You can step the whole chart to the right a few degree columns as I have with no apparent downside, but keep in mind, my car runs very cool from an intake perspective..
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Drifting
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Volume of air... You could Zero out the table but you'd run the risk of causing severe detonation damage in a high temp condition...The timing is pulled for a reason. You can step the whole chart to the right a few degree columns as I have with no apparent downside, but keep in mind, my car runs very cool from an intake perspective..
Safety Car
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From: CHOCOWINITY NC
IAT's can easily rise 20-30 degrees over ambient when sitting in traffic. I recently put a wrap of Koolmat insulation between my Air bridge and Radiator/cooling hoses, and I only get about a 10 degree rise now..Control the heat for best performance..
Drifting
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That's pretty hard to figure. I have a cool air box built around my intake, fed by a grill mounted Vette-Air, so i'm ingesting outside air all the time.. You need to be able to monitor IAT temps. I have a Scangauge mounted and have that info up on the sreeen all the time.
IAT's can easily rise 20-30 degrees over ambient when sitting in traffic. I recently put a wrap of Koolmat insulation between my Air bridge and Radiator/cooling hoses, and I only get about a 10 degree rise now..Control the heat for best performance..
IAT's can easily rise 20-30 degrees over ambient when sitting in traffic. I recently put a wrap of Koolmat insulation between my Air bridge and Radiator/cooling hoses, and I only get about a 10 degree rise now..Control the heat for best performance..
Safety Car
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From: CHOCOWINITY NC
Yes, I do....Sitting at a light the IAT's go up as you would suspect from the engine bay heatsoaking a little. They start to drop immediately and usually hit ambient within 20seconds, once the car gets moving again and are always at ambient on the highway no matter what the temperature...
Drifting
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Thanks!..
Yes, I do....Sitting at a light the IAT's go up as you would suspect from the engine bay heatsoaking a little. They start to drop immediately and usually hit ambient within 20seconds, once the car gets moving again and are always at ambient on the highway no matter what the temperature...
Yes, I do....Sitting at a light the IAT's go up as you would suspect from the engine bay heatsoaking a little. They start to drop immediately and usually hit ambient within 20seconds, once the car gets moving again and are always at ambient on the highway no matter what the temperature...
Safety Car
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From: CHOCOWINITY NC
Based on the charts provided previously I assume it would, but my car never gets that hot. It stabilizes at about 182 on the road, and doesn't get above 200 sitting at a light. 160Stat and a fan re-tune handles that part of it (as I mentioned before).
BTW an inexpensive Scangauge is pretty handy for reporting all that information. I have one in each of my cars..
Safety Car
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From: CHOCOWINITY NC
Drifting
Joined: Jan 2008
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edit. perhaps the LS7 is different due to the thin side walls of the block??
Last edited by walterm32; Aug 6, 2008 at 05:23 PM.