check valves and FMU's?

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09-10-2007, 06:56 PM

Nismo-san

0.5 BAR

Thread Starter

Join Date: Sep 2007

Posts: 142

check valves and FMU's?

i know the purpose behind a FMU, but what do check valves/ missing kinks accomplish? i hear everyone using them who are using FMU's, but i need someone to explain the concept....i've looked here and haven't found any info yet as to there function... :1

09-10-2007, 07:02 PM

J-MAN

0.0 BAR

Join Date: Mar 2003

Posts: 0

Re: check valves and FMU's?

they bleed off boost so the map sensor doesn't see it and throw a CEL

09-10-2007, 07:26 PM

Nismo-san

0.5 BAR

Thread Starter

Join Date: Sep 2007

Posts: 142

Re: check valves and FMU's?

ah....that makes sense...thanks dude

09-10-2007, 07:55 PM

klyph

1.5 BAR

Join Date: May 2007

Posts: 749

Re: check valves and FMU's?

I didn't think they bled off boost, I thought that when the boost reaches a certain level, they close a valve. Do they really vent boost to atmosphere?

09-10-2007, 08:31 PM

ososlohatch

3.0 BAR

Join Date: Apr 2005

Posts: 6,036

Re: check valves and FMU's?

Quote:

Originally Posted by klyph

I didn't think they bled off boost, I thought that when the boost reaches a certain level, they close a valve. Do they really vent boost to atmosphere?

no they let boost out, they open a valve in boost that bleeds off the pressure

09-10-2007, 10:29 PM

Skaterdudz02

1.0 BAR

Join Date: May 2007

Posts: 230

Re: check valves and FMU's?

Quote:

Originally Posted by Nismo-san

Check valves work pretty decent, bleeding off positive pressure so the MAP sensor doesn't read it; therefore, keeping the ECU happy. I'm only using two on my setup right now, and haven't thrown a CEL.