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Need afr for 7 psi

 
Old 04-03-2017, 03:58 PM
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Default Need afr for 7 psi

It been a while since Ive been on the forum. But the old miata is giving lean problems.
I threw away the afpr, kept the bipes timing unit and got a TDR fuel tunner 3 (fuel management simular to Voodoo Box)

Running a non-intercooled M45 supercharged 1996 miata.

My afrs are 13.1 @ 7 psi @ 7000 RPMs. With 1.8L injectors.

I cannot get the AFRs to go richer. Guess the fuel pump must be weak.
What afr do u recommend for 7 psi.

Last edited by Toddcod; 04-03-2017 at 11:52 PM.
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Old 04-03-2017, 04:09 PM
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I only understood about 60% of this post.

I'll throw in a vote for 12.5-13 seems ok, err on richer for non-intercooled.
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Old 04-03-2017, 04:49 PM
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welcome back, old timer
I recommend you embrace technology post 1989
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Old 04-03-2017, 11:56 PM
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Thanks, its good to hear from you 18 psi and everyone.
I thought 13's were fine, but couldnt remember.
i guess Ill change the fuel pump and shoot for 12.5 afr.

This little M45 gives a nice boost.... But its not extreme like a Garrett turbo.
The little controller should work fine for going back and forth to work and passing traffic. Lol
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Old 04-04-2017, 12:07 AM
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12.0 at least
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Old 04-04-2017, 08:11 AM
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what was the point of this exercise?
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Old 07-22-2017, 09:02 PM
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I run 12.5 at that boost level but I have a big turbo and intercooler for low intake temps. You should probably run a bunch richer, maybe 12 or 11.5 to be safe. But really you need an intercooler.

Also why are you running fuel/timing bandaids from 15-20 years ago?
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Old 07-22-2017, 09:12 PM
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Originally Posted by 18psi View Post
welcome back, old timer
I recommend you embrace technology post 1989
Thanks, now you owe half a beer. That's what just came out of my nose.
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