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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 11-28-2006, 04:42 PM   #21
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if anything you can throw a restrictor on the vacuum line to simulate less vacuum. But I'm sure the ECU can compensate for a 10% larger injector.
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Old 11-28-2006, 05:03 PM   #22
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stock injector is 230cc correct? 305cc is 25% bigger right? i don't think the ecu will deal with a 25% better flow rate. i being a cheap jerk and i'm trying to avoid the expense of good electronics(hillbillies don't like new fangled things and we rig everything); i'm only shooting for 8 psi with a Sanford and Son turbo kit . i read where many of the old 90-93 miatas get away with bigger injectors without electronics. i'm just trying to do the same with my posc.
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Old 11-28-2006, 05:07 PM   #23
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technically speaking you could run the engine incredibly lean and get the same power, egts, etc... the only downer being uncontrollable NOx emissions because there wouldn't be sufficient carbons in the exhaust stream for the catalytic converter to do it's think.

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Originally Posted by Ben View Post
Yeah, it seems ok to me. It's only ~15.7 at ~850 rpm idle. Add the smallest possible amount of throttle (~1000 rpm) possible and it richens to 14.7.

I was curious because I'm working up the energy to bolt on the rx7 afm, and I need a target idle afr.
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Old 11-28-2006, 08:21 PM   #24
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Originally Posted by left field View Post
stock injector is 230cc correct? 305cc is 25% bigger right?
it's a big conspiracy carved in stone by your friends at M.net

94-97 (tan) 265cc
99-00 (red) 240cc
01-05 (purple)(incl. MSM) 265cc
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Old 11-28-2006, 08:48 PM   #25
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one place says one thing, another somthing else. as much as these forums have helped me in my quest for fire breathing miata(oxymoron), the conflicting data provides fun confusion. i'm going to have faith in braineack(with 2793 posts i'll believe him). in the end it seems my idea has merit. i'll give it a shot with the larger injectors, worst case i run rich and i can always go back to little ones
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Old 11-28-2006, 09:28 PM   #26
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Quote:
Originally Posted by AndyFloyd View Post
Oh yeah I run 330's and they idle fine. You have to toghten the spring in the AFM to get them to idle a little more lean. Mine runs great w/o any problems.
Dude. Where did you get the 330s from?

Thinking: why bother with 1.8s? Are 330s a better choice than 305s for power potential vs. set-up? What's your duty-cycle with the 330s?

hijack.

Last edited by UofACATS; 11-30-2006 at 04:54 PM.
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Old 11-28-2006, 09:37 PM   #27
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At the top of the post see Flyin Miata's flow test results:
https://www.miataturbo.net/forums/sh...6&postcount=17

The 1.8 injectors in my car tested at 266 cc/min at 43.5 psi (3 bar).

305s may work (?) without any modifications in your obdII car. Definately worth a shot.



Quote:
Originally Posted by left field View Post
stock injector is 230cc correct? 305cc is 25% bigger right? i don't think the ecu will deal with a 25% better flow rate. i being a cheap jerk and i'm trying to avoid the expense of good electronics(hillbillies don't like new fangled things and we rig everything); i'm only shooting for 8 psi with a Sanford and Son turbo kit . i read where many of the old 90-93 miatas get away with bigger injectors without electronics. i'm just trying to do the same with my posc.
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