new injectors, now too lean, adjust air? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-09-2008, 02:09 PM   #1
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Default new injectors, now too lean, adjust air?

so my car used to run lean as hell running 1.8L injectors, so i put in some 440cc injectors. of course now i'm rich as hell (better rich than lean). turbochargers.com was tuning my car, but with the new injectors my clutch is slipping so they couldn't finish it. anywho, my main question is is there a way to adjust air flow to try to stoich it on lower rpms on the emb for now? i'd say from idle to about 2000 rpm its rough, but once i hit boost its pretty smooth. any advise? i put in brand new spark plugs which helped some, but still kinda rough. oh, also lowered the pressure on the begi afpr as much as possible.
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Old 08-10-2008, 02:47 AM   #2
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Quote:
i'd say from idle to about 2000 rpm its rough, but once i hit boost its pretty smooth.
Mine does the same thing... I'm hoping when I put my wideband in (staring at it on my desk) autotune will fix it...
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Old 08-10-2008, 07:43 AM   #3
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There has been alot fo argument about running more then 330cc on EMB, seem there is probably one exception which has been running 440cc on EMB ever had sucess. If u are running autotune + EMB, Autotune will not fix anything while u are not in boost (1) and will not cut any fuel (2).

I've had great sucess like many on 305cc + EMB + Autotune + Vortech FMU (4
:1 disc) + Rx7 AFM.

The only options u might be able to fix your idle is trinkle with your AFM spring, ONLY if u are running 1.6L AFM. It would be nice if you can tell us what of set up on your car.
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Old 08-10-2008, 12:24 PM   #4
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190 lhp walbro fuel pump, begi afpr, greddy turbo kit, intercooler, enthuza exhaust. i have an autotune, just haven't installed it yet. how would i mess with the AFM spring? i have the 1.6L AFM. actually....my originaly started to stick so my mechanic gave me a toyota denzo one that was exact fit. i wonder if its the same.
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Old 08-10-2008, 02:07 PM   #5
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^Put that in your sig so people don't have to ask you in the future what your setup is.

I'd recommend bottoming out your base fuel pressure... ie, be sure the AFPR isn't raising base fuel pressure any. That'll help your off-boost AFR considerably.
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Old 08-10-2008, 11:26 PM   #6
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oh, I meant EMU's autotune. =o
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Old 08-11-2008, 03:13 PM   #7
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Originally Posted by BrillntBlk92 View Post
190 lhp walbro fuel pump, begi afpr, greddy turbo kit, intercooler, enthuza exhaust. i have an autotune, just haven't installed it yet. how would i mess with the AFM spring? i have the 1.6L AFM. actually....my originaly started to stick so my mechanic gave me a toyota denzo one that was exact fit. i wonder if its the same.

I wouldn't trust it being the same, not until if you could varify it with an WB02 log telling you its idling around 14.7. Search about the AFM spring tuning.

I am pretty sure u are running Pig rich with those 440cc, If you want I can swap my 305cc for those 440cc. So you won't be idling rough like what you had said.
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Old 08-11-2008, 06:16 PM   #8
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i'm gonna try to get some credit back for these injectors first. they were sold to me new for $330 so i'd like to get some of that back. i might end up with 305s but i wanna talk to the guy who tuned my car to see his reasoning behind the 440s. i'll let you know what happens. I also had my one of those 6 green top supra 305cc injectors in the parts for sale page for only $55
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Old 08-26-2008, 10:29 AM   #9
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why not have an extra injector or two? i had a friend who had trouble making his rx7 470cc injectors to work with the EMB. instead he used his stock injectors and installed two extra 470cc injectors for when the boost kicks in
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Old 09-07-2008, 11:31 PM   #10
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Wow! That seems like a shizen lot of fuel...

And he managed to tune that allright so it was driveable??
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Old 09-08-2008, 10:13 AM   #11
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yah....just have someone good to do your fuel map, it's gonna run just ok. he was able to take it up til 16psi
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