fyi, wiseco does not make a 9.0:1 piston - Page 5 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-16-2007, 04:56 PM   #81
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Hustler-read. http://www.musclemustangfastfords.co...tio/index.html

Using the 4% rule. Assuming you make 250whp with 9.0:1 ratio pistons.

9.0-8.6=0.4 This is the change in compression

.4 X 4%= .016 This is how much power will change.

1-.016= .984 This is your new power factor.

250whp X .984= 246whp with 8.6:1 compression. That's a 4WHP difference, which would be almost undetectable.
thanks, but I've stated countless times that I'm concerned with spool and not max output.
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Old 11-16-2007, 04:57 PM   #82
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what turbine wheel do you have?
T3 stage I (journal) .48A/R. 58.xmm vs your 53.8mm turbine wheel and BBs.
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Old 11-16-2007, 05:02 PM   #83
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thanks, but I've stated countless times that I'm concerned with spool and not max output.
And they will be linear. If you increase power X%, your spool RPM will drop X%. Do you understand these are related? That's the whole point of me doing that math is to show you that 1.6% change in power or spool isn't gonna make a ****. Hence, you should have kept the pistons you had.
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Old 11-16-2007, 05:06 PM   #84
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yeah, I'm kinda kicking myself in the *** right now. I still have the quandry of running 2618 or 4032 alloy...wiseco or supertech.
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Old 11-16-2007, 05:10 PM   #85
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i think you should buy a FM stroker built by them, with their FMII kit, installed by them and at full cost.
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Old 11-16-2007, 05:11 PM   #86
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i think you should buy a FM stroker built by them, with their FMII kit, installed by them and at full cost.
I agree.
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Old 11-16-2007, 05:12 PM   #87
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i think you should buy a FM stroker built by them, with their FMII kit, installed by them and at full cost.
+1
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Old 11-16-2007, 05:12 PM   #88
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Maybe he should wait the 3 weeks get some nice custom 9.5:1's or 10:1's. Then his only trouble is the turbo he has may be a bit excessive. This may not effect spool but the car will be snappy off boost. You could also send out the head and get it ported. Between the two you would definitely have what you want.

+1 on the FM idea
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Old 11-16-2007, 05:13 PM   #89
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I agree.
Then to simplify things you should cut your losses and start saving up for the stroker kit from FM. If you still have aftermarket rods I'll give ya 100 for them.
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Old 11-16-2007, 05:17 PM   #90
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Then to simplify things you should cut your losses and start saving up for the stroker kit from FM. If you still have aftermarket rods I'll give ya 100 for them.
go ahead and paypal the cash to me.
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Old 11-16-2007, 05:24 PM   #91
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What's your paypal? How much to ship them? What brand are they?
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Old 11-16-2007, 05:26 PM   #92
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What's your paypal? How much to ship them? What brand are they?
just send the money. $100. Hold on while I set up a "new" account.
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Old 11-16-2007, 05:27 PM   #93
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Not directly comparable, but my stock motored 94 (8.8-1) running a standard FMII (GT25) made 15 psi by 3100 rpm. 12 psi by 2900. I dropped from 3400 by spending some time on the dyno. Car has no cat, and a 3" exhaust. Compression ratio is a minor detail. Open exhaust and a good tune are much more important and make a much bigger impact on how the turbo will spool.

Any turbo car will feel like a dog off boost. Its because on boost is so much more fun. I can tell you that I RARELY experienced lag in my car. And that was usually a result of me being in the wrong gear.
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Old 11-16-2007, 05:31 PM   #94
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When I drove around with my wastegate wired open I thought the car was broke. I was actually scared to take it WOT cause it just wasn't right....even though I knew in my mind I just lost 250% of the power on purpose.
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Old 11-16-2007, 05:35 PM   #95
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When I drove around with my wastegate wired open I thought the car was broke. I was actually scared to take it WOT cause it just wasn't right....even though I knew in my mind I just lost 250% of the power on purpose.
I don't understand.
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Old 11-16-2007, 05:37 PM   #96
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I don't understand.
Yeah, we get that.
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Old 11-16-2007, 05:38 PM   #97
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Yeah, we get that.
the car was broken, so you still shifted at redline instead of taking care of it?
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Old 11-16-2007, 05:41 PM   #98
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wired open wastegate = 0psi = 90rwhp
non-wired wastegate = 13psi = 230rwhp

230/90 = 2.5 or 250% power loss.
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Old 11-16-2007, 05:42 PM   #99
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wired open wastegate = 0psi = 90rwhp
non-wired wastegate = 13psi = 230rwhp

230/90 = 2.5 or 250% power loss.
I don't understand the context. I understand that an open wastegate means no postive pressure. I'm reading into the comment too much apparently.
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Old 11-16-2007, 05:44 PM   #100
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yes. SpyHunter mentioned a turbo car being a dog off boost. i was saying without boost the car felt broked.
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