what compression ratio for more boost - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 02-21-2009, 05:09 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.
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Old 02-22-2009, 02:41 AM   #42
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Quote:
Originally Posted by madmalc View Post
this is the engine bay

I have the same strut bar but for the life of me I can't remember who makes it? do you know?
Sorry about off topic post**
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Old 02-22-2009, 02:58 AM   #43
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figured it out 10-AE right. sorry OP
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Old 02-22-2009, 09:39 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.
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Old 02-22-2009, 11:47 AM   #45
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Quote:
Originally Posted by hustler View Post
Good luck find someone else making 250wtq at 15psi
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.
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Old 02-22-2009, 12:30 PM   #46
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Quote:
Originally Posted by y8s View Post
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.
I'd like to see it with the same turbo on a 9.5 motor for a comparison between comp ratios.
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Old 02-22-2009, 01:08 PM   #47
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Quote:
Originally Posted by hustler View Post
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.
This forum is obsessed with spool like a IRTB fanboi with his ***-ripping throttle response.
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Old 02-22-2009, 03:27 PM   #48
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Quote:
Originally Posted by hustler View Post
I'd like to see it with the same turbo on a 9.5 motor for a comparison between comp ratios.
10:1 close enough?
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Old 02-22-2009, 05:42 PM   #49
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10:1 close enough?
with the same turbo, yes.
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Old 02-22-2009, 06:40 PM   #50
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I've got the same turbine...
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