Black smoke!? Diesel stylin it...

G

ggeiss240sx

New Member
Nov 8, 2005
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Laramie, WY
www.cardomain.com
So I put my 6:1 FMU on the supra and when it boosts it runs...very rich. Im running the N/A yellow injectors(long story if you havent followed up on my build up) but even then im only running about 5psi of boost at the moment and when it does boost it dumps a hefty amount of black smoke. Figured since im running the smaller injectors I would need to back them up with an FMU but im starting to question that right now. Anyway just wondering if this is...bad or maybe if I should just remove the FMU for now until I start to run higher boost... Thanks much!

-Gary
 
Stretch

Stretch

Tallest MK3 driver ever!!
Mar 30, 2005
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He most deffinitely is refering to fmi. Front mount intercooler. The i and u on the keyboard are right next door so he just slipped I think.
eric
 
Suprapowaz!(2)

Suprapowaz!(2)

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Apr 10, 2006
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Yeah, something like this. I have no experience with a unit like that. Sorry.
http://www.cartech.net/fmu2020.htm

Does 6:1 mean a rising rate of 6psi for every psi of boost? If so then I would think that that would be alot of fuel pressure. At the end of 5psi of boost you'll be up at 30psi on top of your baseline fuel pressure. Is that how it works, or am I wrong. Someone correct me with some valuable info on this FMU.
 
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Adjuster

Adjuster

Supramania Contributor
Apr 8, 2005
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Meridian, Idaho, United States
www.adjusteridaho.com
Yikes, 6:1 fuel to boost pressure?

I've only played with the 1:1 fuel pressure regulators, but I would think that adding that much fuel would be interesting, and at some point, quickly the stock fuel pump would fail to supply more pressure no matter what the FMU tells it to do. (Do you have a gauge on there? I'd be curious to see what your fuel pressure is doing just driving around town, let alone on 5psi of boost.)

Where did you read about using NA injectors on more fuel pressure? It's a nice idea, but at some point you have diminishing returns since the fuel pumps are not flowing as much at higher pressures from what I've been told. (Volume is important as is pressure on vane type pumps.)
 
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