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Old 12-27-2007, 10:42 PM   #1
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Today was productive, I got the BEGI FMU, the 305 injectors and the dual feed rail installed. I then turned the MBC up from 9-12 PSI. The power difference is noticeable. I still need to fine tune the FMU as I am running pig rich. My last challenge is my exhaust, greedy DP then stock. I ordered a DP from BEGI over 3 months ago, and I am still waiting. I am now pondering constructing a 2.5 DP my self; I have an extra turbo flange and a wire welder.
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Old 12-27-2007, 10:55 PM   #2
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Wow, I'm right where you are, minus the extra boost. Plus an Emanage Blue. Plus a lean spike to 13.4 at 4 rpms.
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Old 12-28-2007, 12:03 AM   #3
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tuning is everything- that will make a big difference in the boost up
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Old 12-28-2007, 08:29 PM   #4
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I'd say the difference between my engine going KABOOM and ZOOM.
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Old 12-29-2007, 10:23 AM   #5
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Are you using a fuel pressure gauge. You should see at least 90psi and probably want around 100psi for 12psi boost to get in the 12-13:1 AFR range.

This dyno plot w/fuel graph was exactly that... 12-13psi boost and 100psi fuel pressure w/base timing at 14* and Bipes pulling 7*... just about as good as it's gonna get.
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Old 12-29-2007, 11:45 AM   #6
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Quote:
Originally Posted by samnavy View Post
Are you using a fuel pressure gauge. You should see at least 90psi and probably want around 100psi for 12psi boost to get in the 12-13:1 AFR range.
I only used a pressure gauge, to set the base pressure. My wide band shows my AFR dropping like a rock as soon as it enters positive pressure in the manifold, down to 12:1 at 5 PSI, 11:1 at 8 PSI, and 9.8:1 at 12 PSI. I am taking it to a dyno Wednesday, and will make my final adjustments then.

Last edited by Milton Tucker; 12-29-2007 at 12:17 PM.
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Old 12-29-2007, 11:47 AM   #7
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Too rich. You need the FMU to bleed pressure better. Sounds like you need 2 or 3 check valves in parallel after the needle valve.
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Old 12-29-2007, 12:42 PM   #8
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I noticed, after 10psi, having a fmu wasnt fun. too hard to find the equalibrium between a safe mid-range AFR and a not too rich top-end after open loop.
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