New Logs - These Seem Better Except One
Oct 8, 2006, 11:53 PM
#31
The Evo IX DOES favor boost spikes with reduced timing. Works excellent with a properly comfigured MIVEC map.
Originally Posted by jcsbanks
Cylinder pressure spikes are what are stressful on the bottom end.
Extra timing tends to produces cylinder pressure spikes and a disproportionate amount of stress on the engine for a modest increase in BMEP (read torque).
Extra boost increases BMEP from an increase in area under the cylinder pressure curve and a relatively modest increase in peak cylinder pressure if you have the timing sensible.
The above is based on Corky Bell (Maximum Boost), and supported by personal practical experience on high specific output turbocharged engine tuning. I'm sure Dynoflash has his own views as well supported by experience, but with recent improvements in understanding of how the Evo ECUs work from disassembly and other techniques, I've not been tempted to change a thing about my tuning methodology and see lots of things I don't like in the sea of 8s and 9s or whatever at peak torque on Evos on pump fuel.
Extra timing tends to produces cylinder pressure spikes and a disproportionate amount of stress on the engine for a modest increase in BMEP (read torque).
Extra boost increases BMEP from an increase in area under the cylinder pressure curve and a relatively modest increase in peak cylinder pressure if you have the timing sensible.
The above is based on Corky Bell (Maximum Boost), and supported by personal practical experience on high specific output turbocharged engine tuning. I'm sure Dynoflash has his own views as well supported by experience, but with recent improvements in understanding of how the Evo ECUs work from disassembly and other techniques, I've not been tempted to change a thing about my tuning methodology and see lots of things I don't like in the sea of 8s and 9s or whatever at peak torque on Evos on pump fuel.
Oct 9, 2006, 04:31 PM
#34
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If you guys don't have anything constructive to add to the post - save your comments.
Thanks.
Thanks.
Last edited by kapolani; Oct 9, 2006 at 04:34 PM.
Oct 9, 2006, 05:50 PM
#35
Originally Posted by jcsbanks
Cylinder pressure spikes are what are stressful on the bottom end.
Extra timing tends to produces cylinder pressure spikes and a disproportionate amount of stress on the engine for a modest increase in BMEP (read torque).
Extra boost increases BMEP from an increase in area under the cylinder pressure curve and a relatively modest increase in peak cylinder pressure if you have the timing sensible.
The above is based on Corky Bell (Maximum Boost), and supported by personal practical experience on high specific output turbocharged engine tuning. I'm sure Dynoflash has his own views as well supported by experience, but with recent improvements in understanding of how the Evo ECUs work from disassembly and other techniques, I've not been tempted to change a thing about my tuning methodology and see lots of things I don't like in the sea of 8s and 9s or whatever at peak torque on Evos on pump fuel.
Extra timing tends to produces cylinder pressure spikes and a disproportionate amount of stress on the engine for a modest increase in BMEP (read torque).
Extra boost increases BMEP from an increase in area under the cylinder pressure curve and a relatively modest increase in peak cylinder pressure if you have the timing sensible.
The above is based on Corky Bell (Maximum Boost), and supported by personal practical experience on high specific output turbocharged engine tuning. I'm sure Dynoflash has his own views as well supported by experience, but with recent improvements in understanding of how the Evo ECUs work from disassembly and other techniques, I've not been tempted to change a thing about my tuning methodology and see lots of things I don't like in the sea of 8s and 9s or whatever at peak torque on Evos on pump fuel.
Last edited by mchuang; Oct 9, 2006 at 05:53 PM.
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