MS settings going from N/A to turbo - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-07-2009, 02:05 AM   #1
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Default MS settings going from N/A to turbo

I'm close to getting my MS running pretty well on my 1.6 N/A. My next step is to put on my .48 T3.

I plan initially to run stock injectors and about 6-8psi of boost. From what I've read, the stock injectors should be able to handle that much boost without excessive duty cycling. I know I need to lenghten the injector timing but to what setting? I've lowered the AFRs above 100 to ease down to 12.5. What else should should I be modifying?
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Old 03-07-2009, 05:12 AM   #2
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...the injectors. Stock injectors are tapped out at 6psi, like 90%+ duty cycle. You NEED injectors. You also need to tune for 12.0:1 at the leanest when you're above about 2-3psi. I tune for 13.0 at 100kpa, and it sinks to the mid 11s by 6psi.
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Old 03-07-2009, 06:47 AM   #3
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12.5 is on the lean side for boost. Depending on your setup and how well it cools the air and how much timing you run, if you can avoid the detonation I've found that 12.2-12.3 is really nice according to the butt dyno sub-7 psi but above that 12.0-11.8. 11.5:1 is more sluggish in my findings.
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Old 03-07-2009, 04:36 PM   #4
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Thanks for the feedback. I've adjusted the AFR richer from 100 up and I'm looking for some injectors now.

I appreciate the help.
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