what compression ratio for more boost
02-21-2009, 04:09 PM
#41
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FWIW 9:1 (also Supertech pistons and Belfab rods, nizzle) is what I am using on my built motor. Results and dyno plots to follow.
Hustler is showing good results with 8.5:1 so that can work too. His timing map in boost is sick.
Hustler is showing good results with 8.5:1 so that can work too. His timing map in boost is sick.
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02-22-2009, 08:39 AM
#44
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This in an 8.5:1 motor:
(RPM is not accurate...spooled-up at 4k rpm)
everyone is afraid to run compression that low, but they're also afraid to post dyno's with that much torque. However the beauty is in the spark map:
Good luck find someone else making 250wtq at 15psi, its going to be even tougher to find someone who's done it on a dynodynamics box...so add the standard 10% differential and look for someone making 275wtq on a dynojet. If you can find someone making that much torque and whp, its not going to be on the higher compression ratios everyone is using here.
Dig through this thread and you'll probably learn something.
Everyone I've spoken to or discussed this with wasted no time in talking **** about how I fucked up on my motor with the compression ratio, the turbine housing is too big, or whatever else...but they're also dropping their jaws when the drive the car or get steam rolled by it.
(RPM is not accurate...spooled-up at 4k rpm)everyone is afraid to run compression that low, but they're also afraid to post dyno's with that much torque. However the beauty is in the spark map:
Good luck find someone else making 250wtq at 15psi, its going to be even tougher to find someone who's done it on a dynodynamics box...so add the standard 10% differential and look for someone making 275wtq on a dynojet. If you can find someone making that much torque and whp, its not going to be on the higher compression ratios everyone is using here.
Dig through this thread and you'll probably learn something.
Everyone I've spoken to or discussed this with wasted no time in talking **** about how I fucked up on my motor with the compression ratio, the turbine housing is too big, or whatever else...but they're also dropping their jaws when the drive the car or get steam rolled by it.
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02-22-2009, 10:47 AM
#45
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you want i should add 6 psi and see how much torques I got?
incidentally, squirrel performance requires me to crank the VE% way up to 130 at peak power to get 250 hp at 9.6 psi. I dont know why they leave the VE so low. FI engines are not running 89% VE.
incidentally, squirrel performance requires me to crank the VE% way up to 130 at peak power to get 250 hp at 9.6 psi. I dont know why they leave the VE so low. FI engines are not running 89% VE.
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02-22-2009, 12:08 PM
#47
Everyone I've spoken to or discussed this with wasted no time in talking **** about how I fucked up on my motor with the compression ratio, the turbine housing is too big, or whatever else...but they're also dropping their jaws when the drive the car or get steam rolled by it.
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