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Old 07-22-2009, 10:56 PM   #1
Hylton


 
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Who else is bouncing off the fuel cut-off?

I'm a bit of an old school racer and I shift gears when I feel the car dropping out of the power band. The problem I am having is that the fuel shut off kicks in before the car runs out of power.

Clearly, there is more power in the LS3 motor past 6,500 rpm. Is it possible to tune the fuel shut off up to 7K?
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Old 07-23-2009, 08:17 AM   #2
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If you have a tune done, At that time it can be done.
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Old 07-23-2009, 10:54 AM   #3
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I would also be curious in this and would like to see someone make a dyno pull out to 7000 rpms, as all dyno runs i have seen the power really hasn't started dropping off at the rpms they shut it down at.
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Old 07-23-2009, 10:57 AM   #4
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I would also be curious in this and would like to see someone make a dyno pull out to 7000 rpms, as all dyno runs i have seen the power really hasn't started dropping off at the rpms they shut it down at.
Exactly! When you look at the dyno sheets on here, they all stop the pull when the car is still in the powerband! Consequently, this translates into slower quarter mile times because you cannot shift at the most optimal RPM.
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Old 07-23-2009, 11:13 AM   #5
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After looking on some posts on a different forums i think that it is set to 6500 rpm is that the valve springs will not go a lot more and live.
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Old 07-23-2009, 11:20 AM   #6
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After looking on some posts on a different forums i think that it is set to 6500 rpm is that the valve springs will not go a lot more and live.
Sounds like an upgrade is in order.....
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Old 07-23-2009, 11:32 AM   #7
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In stock form the horsepower is falling off before you are feeling it. I have made 30 plus pulls on the dyno in many configurations including head and cam and the power still drops over prior to the 6600 cut off.

Shift sooner, it's faster and a lot easier on parts. Unloading and loading is what causes torsional stresses that break parts.


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Old 07-23-2009, 11:46 AM   #8
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In stock form the horsepower is falling off before you are feeling it. I have made 30 plus pulls on the dyno in many configurations including head and cam and the power still drops over prior to the 6600 cut off.

Shift sooner, it's faster and a lot easier on parts. Unloading and loading is what causes torsional stresses that break parts.


Robin
But if you powershift the car, you need to be able to run into high rpm in order for the engine to "drop" into the optimum rpm range when the clutch is let out. I know this is not something that can be tested on the dyno but I'm sure you know what I mean.
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Old 07-23-2009, 11:52 AM   #9
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But if you powershift the car, you need to be able to run into high rpm in order for the engine to "drop" into the optimum rpm range when the clutch is let out. I know this is not something that can be tested on the dyno but I'm sure you know what I mean.

Hehe, forgot about that 500 to 600 over and the limiter won't allow that.

I have had several stock cammed LS3's on the dyno and with carb intakes they pulled to 6900 RPM. THe valve springs are decent.

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Old 07-23-2009, 11:58 AM   #10
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Hehe, forgot about that 500 to 600 over and the limiter won't allow that.

I have had several stock cammed LS3's on the dyno and with carb intakes they pulled to 6900 RPM. THe valve springs are decent.

Robin
Cool, thanks! Time to go play with the ECM...
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Old 08-19-2009, 02:35 PM   #11
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Lingenfelter makes an electronic shift light.. sounds like you need one.
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Old 08-19-2009, 02:37 PM   #12
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Lingenfelter makes an electronic shift light.. sounds like you need one.
What I really need is to move the cut-off up 500 rpm.
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