I have a SOHC turbo, with a 255 Walboro, running a FMU/missing link. It has been running strong for over 5,000 miles, but all the sudden I noticed that when im not in boost, and when the car is around 2,000-3,000RPM's it starts to bog when i want to get on it. It used to only do it when the car was cold, and I figured since it was cold, it didn't want to move. But now, I can hear the turbo spooling up, and the car just doesn't want to go. Eventually, if I keep letting it bog it eventually gets up and starts going. It feels like the car is choking. Once its in boost it is fine, or atleast I think it is. If anyone has any insight to my problem, I would greatly appreciate it.

Don't tell me to ditch my FMU either.

 

bad o2 sensor

 

those 255's have a tendency to raise your base fuel pressure. maybe its running too rich.

 

never thought of the o2 sensor, maybe ill check that out.

also, i was told that it might be running really rich, like rextec said. i was told to get a fuel pressure regulator and that will lean out the fuel a little more. i know its running rich, but i guess too much of anything is bad any other ideas?

 

my vote goes in for overly rich.
Get an adjustable fpr and gauge to lower you fuel pressure back to stock. Whats your complete set-up.

 

y7 bone stock
z6 trans
t3 super 60
tial wastegate
fmu/missing link
revhard front mount
anything else i forgot?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by japearl &raquo;</TD></TR><TR><TD CLASS="quote">y7 bone stock
z6 trans
t3 super 60
tial wastegate
fmu/missing link
revhard front mount
anything else i forgot?</TD></TR></TABLE>

stock injectors?

 

yeah, totally stock minus what i said

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by japearl &raquo;</TD></TR><TR><TD CLASS="quote">
Don't tell me to ditch my FMU either. </TD></TR></TABLE>

Okay, so you know the solution to the problem but don't want to fix it?

Ditch the FMU! Get Uberdata + DSM 450s = no more problems

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EJ1 wilcox &raquo;</TD></TR><TR><TD CLASS="quote">

Okay, so you know the solution to the problem but don't want to fix it?

Ditch the FMU! Get Uberdata + DSM 450s = no more problems </TD></TR></TABLE>

Ahhh not this again. The FMU works. What did people run back in the day when Uberdata wasn't around? It has worked on my car and it will work until I can afford to get tuned. I've seen SOHC turbo cars run 12's running a FMU. Sure tuning is where it's at and will make my car run great, but I know that the FMU/Missing Link setup gets the job done. This isn't another "FMU sucks" thread.

Is anyone else running a FMU using a fuel pressure regulator?

 

Are you running an Intank or an Inline or both?

 

check ignitor, coil, and your fuel pressure at idle.

 

this car still have a catalytic converter?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b16ahybrid &raquo;</TD></TR><TR><TD CLASS="quote">my vote goes in for overly rich.
Get an adjustable fpr and gauge to lower you fuel pressure back to stock. Whats your complete set-up.</TD></TR></TABLE>

I agree with him.

From running rich the O2 is probably contaminated as well, it also wouldn't hurt to replace the spark plugs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by japearl &raquo;</TD></TR><TR><TD CLASS="quote">Is anyone else running a FMU using a fuel pressure regulator? </TD></TR></TABLE>

I was untill this happened

 

o2 sensor i changed it in my h22a and it fixed right away

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboTagTeam &raquo;</TD></TR><TR><TD CLASS="quote">

I was untill this happened
</TD></TR></TABLE>
poor guy

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">this car still have a catalytic converter?</TD></TR></TABLE>

Yes, my car does still have a cat.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EKhothatch &raquo;</TD></TR><TR><TD CLASS="quote">Are you running an Intank or an Inline or both?</TD></TR></TABLE>

I am running a 255 Walboro in tank pump. Ran fine for a good amount of time.

 

just a quick thought how long has it been since you've cleaned or changed the filter in the missing link. have seen this cause problems. also definitely check fuel press. I run uberdata but had no problems out of similar setup fmu/missing link. Buddy's b16 ran 12.8 1/4 mile w/fmu/missing link. was daily driven for 2 years.

 

i ran the 255lph with my ls turbo set up ... no problems at all @ 10psi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civicpacrat &raquo;</TD></TR><TR><TD CLASS="quote">just a quick thought how long has it been since you've cleaned or changed the filter in the missing link. have seen this cause problems. also definitely check fuel press. I run uberdata but had no problems out of similar setup fmu/missing link. Buddy's b16 ran 12.8 1/4 mile w/fmu/missing link. was daily driven for 2 years.</TD></TR></TABLE>

I havent taken the missing link off since i put it on. The missing link would cause my car to bog like that? Never thought that would cause a problem.

 

Damn, you did something wrong...

 

If u bought the missing link new it came w/enough material for several filters and in the inst. said to clean or replace filter occasionally. could basically cause the missing link to fail depending on what ecu tuning etc this could be leading to a map sensor reading boost when the whole point of the missing link is to never let the map see boost.
by the way map sensors depending on variables control timing fuel maps etc.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboTagTeam &raquo;</TD></TR><TR><TD CLASS="quote">

I was untill this happened
</TD></TR></TABLE>

me too...

 

i took a look at my o2 sensor, covered in black.