High RPM LT1?
02-17-2010, 05:33 PM
#1
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High RPM LT1? what all would I need to turn 7500-8000 rpm safely. I am going to have 6" rods and a forged crank either 3.48" or 3.75" stroke. so what all is needed? shaftmounts, solid roller setup, high volume or just high pressure pump? Can the stock ECM keep up at that speed?
02-17-2010, 05:52 PM
#7
The LT1 OBD2 goes to somewhere around 71-7200, is a hardware issue, the pcm can not take any more.
Going to want a HP pump NOT HV, HV will cause problems.
Thing is a 7500rpm solid roller 383 LT1 with ported LT1 castings has gone 9s NA in a 3400lbs car, put a set of properly ported Trickflows and a properly selected single plane on the same engine/car with a smaller cam shift it at 7200 and it goes mid 9s.
Point being, what is your performance goal and budget? At those rpms you are going to spend more on valvetrain than most guys spend on whole street engines.
Going to want a HP pump NOT HV, HV will cause problems.
Thing is a 7500rpm solid roller 383 LT1 with ported LT1 castings has gone 9s NA in a 3400lbs car, put a set of properly ported Trickflows and a properly selected single plane on the same engine/car with a smaller cam shift it at 7200 and it goes mid 9s.
Point being, what is your performance goal and budget? At those rpms you are going to spend more on valvetrain than most guys spend on whole street engines.
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02-17-2010, 06:08 PM
#8
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The LT1 OBD2 goes to somewhere around 71-7200, is a hardware issue, the pcm can not take any more.
Going to want a HP pump NOT HV, HV will cause problems.
Thing is a 7500rpm solid roller 383 LT1 with ported LT1 castings has gone 9s NA in a 3400lbs car, put a set of properly ported Trickflows and a properly selected single plane on the same engine/car with a smaller cam shift it at 7200 and it goes mid 9s.
Point being, what is your performance goal and budget? At those rpms you are going to spend more on valvetrain than most guys spend on whole street engines.
Going to want a HP pump NOT HV, HV will cause problems.
Thing is a 7500rpm solid roller 383 LT1 with ported LT1 castings has gone 9s NA in a 3400lbs car, put a set of properly ported Trickflows and a properly selected single plane on the same engine/car with a smaller cam shift it at 7200 and it goes mid 9s.
Point being, what is your performance goal and budget? At those rpms you are going to spend more on valvetrain than most guys spend on whole street engines.
02-17-2010, 07:51 PM
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I assume you already have a cam in mind? If not, maybe shoot LE or AI an e-mail for a custom solid roller cam for this setup. Any idea what these heavily ported AFR's flow?
02-17-2010, 07:52 PM
#14
http://advancedinduction.com/Abare.html
About halfway down there are some ported stock heads dyno graphs. Again, that is ported stock heads.
I don't put the faith in AFRs that most do, nor do I believe "heavily ported" has to be a good thing. I draw a distinction between the best bench racing parts and the best actual racing parts.
About halfway down there are some ported stock heads dyno graphs. Again, that is ported stock heads.
I don't put the faith in AFRs that most do, nor do I believe "heavily ported" has to be a good thing. I draw a distinction between the best bench racing parts and the best actual racing parts.
02-17-2010, 07:53 PM
#15
www.eficonnection.com
Ls1 pcm can go way higher than the Lt1. there is a full thread about the conversion that Mike at above company has helped to create.
Ls1 pcm can go way higher than the Lt1. there is a full thread about the conversion that Mike at above company has helped to create.
I hope behind this statement lies oodles of sarcasm.
02-17-2010, 08:01 PM
#17
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-AFR's hand ported to 212cc
-62cc chambers
-2.06" intake valves
-1.60" exhaust valves
02-17-2010, 08:14 PM
#18
what all would I need to turn 7500-8000 rpm safely. I am going to have 6" rods and a forged crank either 3.48" or 3.75" stroke. so what all is needed? shaftmounts, solid roller setup, high volume or just high pressure pump? Can the stock ECM keep up at that speed?
