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Old 05-01-2009, 12:52 AM   #1
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Question Just turboed 91 miata, curious about BIPES ACU

Here's my set-up:
-91 1.6L Mazda Miata
-DSM 14B Mitsubishi Turbo (WG set at 7psi)
-No intercooler
-DSM diverter valve reciculated to inlet pipe
-97 1.8L Miata 265cc Brown top injectors
-Vortech 10:1 FMU
-FM o2 signal modifier

I just finished installing everything a week ago and the car seems to be running just fine. Though I haven't adjusted timing or anything. I haven't been driving the car around because of fear that I may blow my motor with out any tuning or adjusting the timing... I'm curios about purchasing a Bipes ACU and was wondering what would be the best settings for my set-up?
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Old 05-01-2009, 01:04 AM   #2
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There are several writeups on bipes acu etc in the diy faq.
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Old 05-01-2009, 01:18 AM   #3
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I would retard the timing 4* just to be safe. I wouldn't leave the timing at 10 or 12 without any sort of tuning band aids. Greddy tells you to retard 4* with the stock kit do you have a wide-band gauge? boost gauge? i would recommend those things with a piggy back unit
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Old 05-01-2009, 01:26 AM   #4
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i do have a boost gauge, no wide-band though. I'm not sure if I want to spend the money on a piggy-back unit. It's kinda a budget project.. I was planning on retarding the timing to 8*, but the Bipes ACU just caught my attention because it can retard my timing up to 20* depending on how much boost to completely avoid detonation and yet be able to keep my stock timing in order to not lose low-end power.
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Old 05-01-2009, 03:23 AM   #5
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You don't tune the Bipes depending on boost necessarily.

You live in VA, so you have 93octane, which should let you push up to 7psi non-intercooled with a Bipes. I'd start at 12* base timing and pull 4* starting at 3000rpm, with an extra degree for every 30*F. If you get knock, either pull your base timing back to 11* or 10*, or increase your total timing pull to 6*.

In any case, you shouldn't need to run less than 6* advanced at any time with 93octane... it shouldn't knock, especially with the 02clamp.

Air filter placement can also be a big deal non-intercooled... getting as cool of an intake charge as you can is basically free power and knock prevention.




You really need an EGT gauge to tune a Bipes effectively.
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Old 05-01-2009, 06:02 AM   #6
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When I used the bipes with a greddy I used the following settings (92 Octane):
static timing 14*
full retard 8*
1* /20C
2500-3800 ( I hit 7psi ~3700)
LEDs set to display 2* of timing retard

I also had the 1.8 injectors and the FMU that came with the kit. It made 150hp like this.
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Old 05-04-2009, 11:08 PM   #7
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okay thank you very much for your help
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