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Old 06-21-2003, 08:22 PM   #1
Mancini
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Chapter/Region: MAIC
Location: Pittsburgh, PA
Thumbs down Vortech FMU

After having erratic fuel pressure for the past week I decided to ditch the FMU and go with just the SAFC2. All I can say is wow, what a difference. Power delivery feels much smoother and my EGT's are finally where they should be.

The FMU was screwing up pressure all over the place. Idle was too high, around 38psi. The FMU was supposed to be 6:1 and I was only seeing a max fuel pressure of 52psi. It would then fluxuate and I'd get a max of 48psi sometimes. I decided to pull the thign and I'm now idling around 34 with a max on boost of 48. Power is just more consistent.

Anyways, just thought I'd share my experience with the FMU. And it was hooked up correctly...dunno why it wasn't working correctly.
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Old 06-22-2003, 04:19 AM   #2
Unsung Boxer
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Good call, i never understood the need for an FMU... always seemed like a bandaid on a broken arm... glad the SAFC is workign out. I am going w/ that route too.

let us know ur results.
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Old 06-22-2003, 10:50 AM   #3
Daveish
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Mancini -- glad to hear that. I had the same problem with my vortech -- although I never measured what it was doing with the fuel pressure, the second I took it out, my car ran exactly like I wanted it to all these years... (well, after twiddling with the safc some)
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Old 06-22-2003, 08:12 PM   #4
Avenger
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I'm just using a regular adjustable fuel pressure regulator and it seems fine.
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Old 06-23-2003, 04:49 AM   #5
Shinji N
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Quote:
Originally posted by Avenger
I'm just using a regular adjustable fuel pressure regulator and it seems fine.
ANALOGY TIME!!!!


Mancini:maf::avenger:map

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Old 06-23-2003, 11:05 AM   #6
Avenger
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Quote:
Originally posted by Shinji N


ANALOGY TIME!!!!


Mancini:maf::avenger:map

Minor details.

I always thought the MAF ecu were better at fuel than the map ecu, with less problems.
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Old 06-23-2003, 11:18 AM   #7
Mancini
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I've noticed that most factory turbo'd cars run MAF or Karman instead of MAP. But most aftermarket ECU's use or prefer the use of MAP. Kinda strange, oh well...

A buddy of mine is converting his DSM, which uses Karman, to a GM MAF. The coolest part, he's going to run blow through so he can still vent this BOV to atmosphere but has the accuracy of a MAF sensor. I may consider this if I ever get a front mount

BTW, I took the FMU apart, it looks cheap and crappy. No wonder it wasn't very accurate. Live and learn I guess. Also I recommend the SAFC2 if you can get your hands on it. The 12 points of adjustment makes things fairly easy to correct in specific areas.
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