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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 08-11-2007, 11:13 PM   #21
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Quote:
Originally Posted by olderguy View Post
Could you explain this and quote some reading sources, please.
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.
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Old 08-12-2007, 01:20 AM   #22
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Originally Posted by drewtam View Post
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

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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Old 08-12-2007, 06:40 PM   #23
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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
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Old 08-12-2007, 07:11 PM   #24
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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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Old 08-12-2007, 10:44 PM   #25
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Originally Posted by firedog25 View Post
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.
Its not like that at all. I work with some cool guys, a bunch of motor heads. We just like to give each other crap about different cars. I dish out so much on my boss with the RX-7 with the ford engine. I keep telling him he should have put a LSx motor in.

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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Old 08-14-2007, 07:23 AM   #26
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Originally Posted by drewtam View Post
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
you could start by searching the "emanage forums" in this website
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