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LS4 Performance Grand Prix GXP | Monte Carlo SS | Impala SS | LaCrosse Super

Top speed run video

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Old May 20, 2011 | 02:53 PM
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Default Top speed run video
Well Ive never topped my car out past 140 and my tuner left it at the factory limiter and never told me what is was set to. Enjoy the vid and let me know if you guys have the same factory limiter or not. BTW if your wondering what I have done to my car: K&N drop in filter, cat removed, Magnaflow Magnapack muffler where the resonator was, 2.5" pipe all the way back, and a Klug Performance tune is all.

http://www.youtube.com/watch?v=vQeN14rItbU
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Old May 20, 2011 | 05:02 PM
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Disclaimer: Done on a closed road in Mexico
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Old May 20, 2011 | 05:07 PM
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very cool, how do you like your shift points at 6500 and whats your rev limiter at if i may ask heading in on Tuesday and want to get that changed around
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Old May 20, 2011 | 05:19 PM
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My shift points are set at 6100 but my rev limiter it set at 7000. I just held it out to about 6500 in second to see how it pulled shifting there.
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Old May 20, 2011 | 09:52 PM
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Very Niceeeee....... Better than mine
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Old May 20, 2011 | 10:03 PM
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Nice!
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Old May 21, 2011 | 11:18 PM
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Yeah def some good top end for a family car.
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Old May 21, 2011 | 11:58 PM
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This is where my limited knowledge comes in, I thought fuel cutoff was 6200 RPMs? Can that be moved? Is it healthy for the stock internals going to 6500?
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Old May 22, 2011 | 12:21 AM
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I know stock LS1s could be reved to 7200 no prob the problem is with the stock cam you are prolly out of the power ban. I just held out second to see if i could hit 110mph in second. I am prolly going to have my tuner remove my speed limiter, leave my rev limiter to 7krpms and set my shift points to 6400rpm and have him do some logging to see if im still making good power still at 6400 vs the 6100 im set at now. Here is a stock dyno chart to show how with the stock cam the power starts to trail off.

http://www.nymcgp.com/dave/GXP/faq/specs/LS4dyno.jpg
Last edited by Gorske; May 22, 2011 at 12:30 AM.
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Old May 22, 2011 | 10:06 AM
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Stock GXP went up to 140 but had plenty more to go
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Old May 22, 2011 | 11:06 AM
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Slight difference between the 1 and the 4, DoD internals.

Mine's been 150, btw.
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Old May 22, 2011 | 12:51 PM
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I think mine is governed at 143.
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Old May 22, 2011 | 12:52 PM
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Whats the cheapest way to remove that?
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Old May 22, 2011 | 01:55 PM
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When are you going to go over 143? Only time I go over 75, now, is the drag strip, unless it's a big autocross course.
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Old May 22, 2011 | 04:09 PM
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Originally Posted by TheJPGXP
When are you going to go over 143? Only time I go over 75, now, is the drag strip, unless it's a big autocross course.
I dont know, ive never been over 103 in my car(end of 2nd) but it would be nice to know that the car can do what it can do and not be stopped.
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Old May 22, 2011 | 05:27 PM
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Haha gotta be able to go 160 to show those Vettes, and Porsches what's up!
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Old May 24, 2011 | 03:19 PM
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nice run
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Old May 24, 2011 | 04:34 PM
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not to go off topic but is it 103 for ever GXP? back on topic that was a pretty cool video let us know if you change the shift points and how feels
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Old May 25, 2011 | 10:18 AM
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GXP's are stock governed at 138mph.
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Old May 25, 2011 | 11:22 AM
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I meant in 2nd gear sorry but if his impala went 148 why do GXP's only go to 138?
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