I'm confoosed...
Joined: Jun 2005
Posts: 19,338
Total Cats: 574
From: Fake Virginia
I can explain it's more a rule of thumb. anecdotally and I guess FM's results tend to point to some limitation of the 99-00 cars around the 9 psi / 230 rwhp. I think they upped the number slightly for the hydra setup but there's some bit of reference to it here:
http://flyinmiata.com/turbos/specs.php
it's just a reasonable conservative limit based on their experience.
http://flyinmiata.com/turbos/specs.php
it's just a reasonable conservative limit based on their experience.
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Senior Member
Joined: May 2006
Posts: 917
Total Cats: -8
I appreciate your guy's help. I have got to save face at work.
Co-worker: Z28 LS1 with reflash
Boss #1: RX-8 Turbo
Boss #2: EVO-8 or 9? and SC'd Mustang GT
Boss #3: 351ci RX-7 (2nd gen?)
Boss #4: Firebird#1 (LS1) and Firebird #2 (LT)
Boss's Boss: 335i
Me: stock '99 Miata
they're like
Drew
Co-worker: Z28 LS1 with reflash
Boss #1: RX-8 Turbo
Boss #2: EVO-8 or 9? and SC'd Mustang GT
Boss #3: 351ci RX-7 (2nd gen?)
Boss #4: Firebird#1 (LS1) and Firebird #2 (LT)
Boss's Boss: 335i
Me: stock '99 Miata
they're like
Drew
They also probably think the measure of a man's car and ***** is how fast he is in hte 1/4 mile. Remind them that your grandmother can mash a throttle and go fast in a straight line.
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I have a td04 I think 14g? It's a .45 turbine and a .48 compressor. Anyone know what that is? I could sell it for like $100 if your interested.
And I'll agree that 10psi is 10psi is 10psi. If one motor makes more HP then another with 10psi it's because the volumetric efficiency of the engine making more power at 10psi is higher. This could be due to a larger turbine flowing better which could explain why one turbo at 10psi works better then another at 10psi. Less exhaust restriction? But don't forget it's all in the curve. =) My advice was always, more or less, to use the smallest turbo for your power requirements. This gets that torque curve lower in the power band.
Eh what do I know. I'm a diy guy. I just slap it on and run it. I can't afford to design it. haha
And I'll agree that 10psi is 10psi is 10psi. If one motor makes more HP then another with 10psi it's because the volumetric efficiency of the engine making more power at 10psi is higher. This could be due to a larger turbine flowing better which could explain why one turbo at 10psi works better then another at 10psi. Less exhaust restriction? But don't forget it's all in the curve. =) My advice was always, more or less, to use the smallest turbo for your power requirements. This gets that torque curve lower in the power band.
Eh what do I know. I'm a diy guy. I just slap it on and run it. I can't afford to design it. haha
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I really do not understand why you would be concerned about killing this turbo. The stock WRX has been sold with 2.0 motors running 13psi for 5 years and for the last 2 years with a 2.5L motor running 11-12psi. Those cars spin the living **** out of those turbos and I can see my friends boost dropping like 4lbs (not stock boost control btw) as he approaches redline and the car actually looses about 10 to 15hp during the last 500rpm. His dutycycles are through the roof. Still the turbo is going strong just like thousands of happy wrx owners out there. So I think you can rule out killing the turbo.
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Thread Starter
Newb
Joined: Apr 2007
Posts: 15
Total Cats: 0
T=P/w
T=(220hp*550ft-lbs/s/hp)/(5500rpm*2*pi*1min/60sec)
T=210 ft_lbs
The reason I am afraid of killing the turbo is that it seems to run out of rpm at 7000 engine rpms in the 1.7Pr and up.
Drew
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Junior Member
Joined: Oct 2004
Posts: 206
Total Cats: 10
Yeah, I know I'll always be the underdog. But if I can pull 220 flywheel hp this is the lb/hp comparison I come up with:
C5 9.7
flashed Z28 10.0
turbo miata 10.9
stock Evo 11.1
stock Z28 11.2
stock GT 11.5
(assuming 200lb driver)
With my .41 A/R, I am hoping for [advertising voice] "Insta-spool! When you need to spool fast." [/advertising voice]
This is my daily driver, so I think this aspect will work out well.
"the advantage with the larger one being less heat in the intake,"
That depends on compressor efficiency at the particular Pr and flow rate, not on the size.
"use your turbo with some 330cc or 365cc injectors and an emanage blue unit to control fuel and timing,"
I was afraid of that. So the stock injectors are not up to the task eh?
Can someone post a link to the "emanage blue unit"?
I've read I'll need a beefier clutch @ 200 lbf-ft, any recommendations on that end?
Drew
C5 9.7
flashed Z28 10.0
turbo miata 10.9
stock Evo 11.1
stock Z28 11.2
stock GT 11.5
(assuming 200lb driver)
With my .41 A/R, I am hoping for [advertising voice] "Insta-spool! When you need to spool fast." [/advertising voice]
This is my daily driver, so I think this aspect will work out well.
"the advantage with the larger one being less heat in the intake,"
That depends on compressor efficiency at the particular Pr and flow rate, not on the size.
"use your turbo with some 330cc or 365cc injectors and an emanage blue unit to control fuel and timing,"
I was afraid of that. So the stock injectors are not up to the task eh?
Can someone post a link to the "emanage blue unit"?
I've read I'll need a beefier clutch @ 200 lbf-ft, any recommendations on that end?
Drew
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