Who out there has more than 600 RWHP on their LT1 PCM?
04-29-2006, 11:29 PM
#4
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Location: I reached back like a pimp and smacked that LS1....
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Re: Who out there has more than 600 RWHP on their LT1 PCM?
Originally Posted by Randy Molkentine
? What are the safety issues with using the stock pcm?
-After MAF sensor maxes out, no measurement of airflow, therefore no airflow based fueling. (if boost fluctuates with ambient conditions fueling will not compensate). An overboost condition will likely result in carnage as timing will remain the same and there will be no additional fueling.
-1 bar map sensor, does not read positive manifold pressure. No boost based fueling, no boost based timing. (timing just locks in on the bottom row when in any amount of boost). Though some have installed a 2 bar map sensor and tuned speed density, I would imagine this to be a lengthy process with no real time tuning capability or histogram logging.
-No WOT closed loop wideband. Not necessary, but can help save your engine if you encounter, say a failing fuel pump or clogged filter.
Many people have used LT1 PCM's on 600+rwhp applications, but IMHO it is rather unsafe and a hack at best when you cannot tune timing and fueling off of actual measured airflow or manifold pressure.
04-30-2006, 11:52 AM
#7
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Re: Who out there has more than 600 RWHP on their LT1 PCM?
The question was asked just to re-affirm that it can be done, and that there are people out there with more than 600 RWHP, tuned on the stock LT1 PCM.
04-30-2006, 08:00 PM
#9
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Re: Who out there has more than 600 RWHP on their LT1 PCM?
Originally Posted by INTMD8
With forced induction?
-After MAF sensor maxes out, no measurement of airflow, therefore no airflow based fueling. (if boost fluctuates with ambient conditions fueling will not compensate). An overboost condition will likely result in carnage as timing will remain the same and there will be no additional fueling.
-1 bar map sensor, does not read positive manifold pressure. No boost based fueling, no boost based timing. (timing just locks in on the bottom row when in any amount of boost). Though some have installed a 2 bar map sensor and tuned speed density, I would imagine this to be a lengthy process with no real time tuning capability or histogram logging.
-No WOT closed loop wideband. Not necessary, but can help save your engine if you encounter, say a failing fuel pump or clogged filter.
Many people have used LT1 PCM's on 600+rwhp applications, but IMHO it is rather unsafe and a hack at best when you cannot tune timing and fueling off of actual measured airflow or manifold pressure.
-After MAF sensor maxes out, no measurement of airflow, therefore no airflow based fueling. (if boost fluctuates with ambient conditions fueling will not compensate). An overboost condition will likely result in carnage as timing will remain the same and there will be no additional fueling.
-1 bar map sensor, does not read positive manifold pressure. No boost based fueling, no boost based timing. (timing just locks in on the bottom row when in any amount of boost). Though some have installed a 2 bar map sensor and tuned speed density, I would imagine this to be a lengthy process with no real time tuning capability or histogram logging.
-No WOT closed loop wideband. Not necessary, but can help save your engine if you encounter, say a failing fuel pump or clogged filter.
Many people have used LT1 PCM's on 600+rwhp applications, but IMHO it is rather unsafe and a hack at best when you cannot tune timing and fueling off of actual measured airflow or manifold pressure.
Thanks for the info,
Randy
05-01-2006, 11:53 AM
#10
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Re: Who out there has more than 600 RWHP on their LT1 PCM?
dynoed 600rwhp widh a P1sc, ported stock heads, cc305, twin IC, 12-13 psi (2004)
Now 17psi from a F1, ported TFS, custom cam, FMIC, RWHP? at least over 600
Now 17psi from a F1, ported TFS, custom cam, FMIC, RWHP? at least over 600
05-01-2006, 12:52 PM
#11
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Re: Who out there has more than 600 RWHP on their LT1 PCM?
Originally Posted by Lisa33
dynoed 600rwhp widh a P1sc, ported stock heads, cc305, twin IC, 12-13 psi (2004)
Now 17psi from a F1, ported TFS, custom cam, FMIC, RWHP? at least over 600
Now 17psi from a F1, ported TFS, custom cam, FMIC, RWHP? at least over 600
05-01-2006, 04:27 PM
#14
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Re: Who out there has more than 600 RWHP on their LT1 PCM?
Originally Posted by Lisa33
.111mph 2003.....126mph 2004....141mph 2005.....
05-02-2006, 01:33 PM
#15
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Re: Who out there has more than 600 RWHP on their LT1 PCM?
156mph? havent notice the 15mph+/year (gotta get me an N20 kit 
) No dont think so, aming for 9.8/143, only upgrade this year is 9.5" vig widh higer stall, 12 rib belt insted of the 8rib....
Daily driven, nope gas is to expensive for that here in sweden (6.1$ / gallon)
Street driven yes
http://www.mazz.nu/index.php?cat=birka1_06
) No dont think so, aming for 9.8/143, only upgrade this year is 9.5" vig widh higer stall, 12 rib belt insted of the 8rib....Daily driven, nope gas is to expensive for that here in sweden (6.1$ / gallon)
Street driven yes
http://www.mazz.nu/index.php?cat=birka1_06
Last edited by Lisa33; 05-02-2006 at 01:36 PM.
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