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Max safe RPMs

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Old Jul 14, 2006 | 08:51 AM
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Default Max safe RPMs

I'm running Patriot 5.3l stage 2 heads and have been told that my car is shifting too soon. Right now, it shifts at 5900 or so and my rev limiter is set at 6300. Am I leaving a lot on the table or is this OK?
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Old Jul 14, 2006 | 09:12 AM
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What are the specs on your cam? That will affect peak HP more than the heads will. Have you had it on a dyno yet?
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Old Jul 14, 2006 | 11:01 AM
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The cam is a 218/221, 526"/534", 116 LSA Lunati. The car has never been on a dyno.
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Old Jul 14, 2006 | 11:06 AM
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Your cam should peak in the 6200>6300 range so shifts should be in the 6500 or so, but not higher.
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Old Jul 14, 2006 | 11:27 AM
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Until I can get a new program, I'll just manually shift and hold the gears a little longer. I was running 12.2s last weekend in drive, so I'll see what difference it makes tonight.
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Old Jul 14, 2006 | 12:07 PM
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I do not recommend that. Just be patient and get it retuned.
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Old Jul 14, 2006 | 12:09 PM
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This will not work if your rev limit is set for 6,300. I would recommend setting the rev limit for 6700-6800, and set the shift points to occur at ~6500 as Predator stated. That should be a sweet spot for your cam. Your '02 short block is fine within this RPM range, just make sure you don't lose oil pressure.
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Old Jul 14, 2006 | 12:24 PM
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Originally Posted by 1hotls1
Until I can get a new program, I'll just manually shift and hold the gears a little longer. I was running 12.2s last weekend in drive, so I'll see what difference it makes tonight.

Please do not do that, ever. The transmission will not like you.


Originally Posted by LS1 Sounds
This will not work if your rev limit is set for 6,300. I would recommend setting the rev limit for 6700-6800, and set the shift points to occur at ~6500 as Predator stated. That should be a sweet spot for your cam. Your '02 short block is fine within this RPM range, just make sure you don't lose oil pressure.

That about sums it up.
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Old Jul 14, 2006 | 12:42 PM
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Originally Posted by LS1 Sounds
This will not work if your rev limit is set for 6,300. I would recommend setting the rev limit for 6700-6800, and set the shift points to occur at ~6500 as Predator stated. That should be a sweet spot for your cam. Your '02 short block is fine within this RPM range, just make sure you don't lose oil pressure.
I second that!
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Old Jul 14, 2006 | 01:02 PM
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Usually you want your shift points 400-600 RPM above the cams HP peak.
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Old Jul 14, 2006 | 02:14 PM
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What springs? Patriot golds I assume? Yeah, set rev limit to 6700 or 6800 and set shiftpoints at 6500.
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