silverbulletgsr

I turbo'd my 2001 integra gsr. I'm pretty sure I put everything in correctly. The car runs great with dsm 450 injectors, 12:1 fmu, 255 fuel pump, t3t4, vafc....8 psi.


When the car gets warm it cuts out around 5500. It feels like fuel cut. It goes to stoich on my a/f guage. The only CEL is for the heater circut on the secondary o2 sensor.

When it's cold I can go all the way to the 8K.

Could the o2 sensor keep my car from going over 5500? Any other suggestions as to why it is happening?

fernancivic

maybe ur map sensor

FOrSfEd

I would also agree about your map sensor.

DENCIO

why are you using fmu with the hack?

turbotypeR@SPEC

you do not need that big of an injector with an fmu at that boost level.you are either going to have to turn up the boost to eat the extra fuel,remove the 450's and re-install the factory injectors,use the hack and remove the fmu,or tune out ALOT of fuel with the afc.if you tune out enough fuel with the afc,you will might still have flooding problems when you stomp the gas.try easing into the throttle instead of just stomping it.

Deluzional

Yea you need to lose that fmu, run your stock map and pick up a resistor box

silverbulletgsr

Can I run stock injectors at 8 psi? 10 psi? Should I lose the Fmu or the injectors?

Why does it work when it's cold?

E-Rok

running 450's and an FMU is pretty pointless IMO.

one or the other. 450's with fuel management or stockers with FMU and a pump.

silverbulletgsr

I thought the 450's and fmu was to much. THe guy at lightning motorsports told me that my fuel adjustments on the low end were screwing up the ECU and making it wig out.

I'm going to try a new o2 sensor and removing the FMU

gsracer170

if you want to stick w/ the fmu and vafc, you need to get 370cc injectors. 450 is just to big.

silverbulletgsr

Should I get rid of the fmu and run -40% on 1k-4k and -35% on 4k-8k? if so is this on wide or narrow throttle?

DENCIO

same settings I had before I got mine dyno tuned. get it dyno tune and you will be a lot happier

silverbulletgsr

anybody know why it's cutting out?

porsche997dc2

I think your fmu is causing the problem. Remove the fmu and try it. Your 12:1 fmu demand 12 psi of fuel pressure for 1 psi of boost. Your 255 fuel pump can't keep up with the fuel pressure. If you want to keep the fmu then you need to run a in-line fuel pump.

bigwig

sell the FMU and just use the injectors, AFC and fuel pump. why the fmu and the AFC???

The reason its cutting out is 100% pressure related. Just get rid of the FMU..the reason you buy an AFC is so you dont have to use the FMU.

TurboJesse

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigwig &raquo;</TD></TR><TR><TD CLASS="quote">sell the FMU and just use the injectors, AFC and fuel pump. why the fmu and the AFC???

The reason its cutting out is 100% pressure related. Just get rid of the FMU..the reason you buy an AFC is so you dont have to use the FMU.</TD></TR></TABLE>

tell that to inline pro who runs there cars into the low 11's with 440's/AFC/FMU...that setup is old and proven, long before the hack..

TurboJesse

also my car did the same thing after i got my hondata tuned...after it got tuned i never drove it with my narrow band o2 back in the car, when i got home and unloaded the car off the trailer, put my stock o2 back in, it started up and drove fine untill the car would warm up, once it was warm it drove just like the conditions you described...i replaced the o2 sensor, and reset the ecu and it drove fine after that..

m R g S r

EXACTLY what happened when I first put the turbo on my car. I never changed the plugs. Then I got some NGK's and gapped them, runs like a champ now.

silverbulletgsr

I got new plugs when I turbo'd it. I gapped them at 30. I also just bought a o2 simulator from importparts.com and it should be here Jan 5. I hope it fixes it.

pip9

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mpir3 &raquo;</TD></TR><TR><TD CLASS="quote">

tell that to inline pro who runs there cars into the low 11's with 440's/AFC/FMU...that setup is old and proven, long before the hack..</TD></TR></TABLE>

They tuned my car and my friends car. He has 440's/fmu/safc. I had 310's/fmu/safc, but i'm running a sohc and he has a dohc 2.0. I never had a problem with it. Sounds like u just need to get the car tuned. If u have the money you should upgrade to a better fuel management system and toss the afc and fmu all together. That's what i'm planning on for my next setup (AEM/440's)

gsracer170

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by porsche997 &raquo;</TD></TR><TR><TD CLASS="quote">Your 255 fuel pump can't keep up with the fuel pressure.</TD></TR></TABLE>

that doesn't make any sense. we had cars going to 10.7 in the quarter w/ the fmu, intank pump, 370cc and vafc.

-Wallace

99blackcivicSi

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by porsche997 &raquo;</TD></TR><TR><TD CLASS="quote">I think your fmu is causing the problem. Remove the fmu and try it. Your 12:1 fmu demand 12 psi of fuel pressure for 1 psi of boost. Your 255 fuel pump can't keep up with the fuel pressure. If you want to keep the fmu then you need to run a in-line fuel pump. </TD></TR></TABLE>

Yeah thats funny a 255hl won't keep up considering cars that run 10s have that.


I never had a problem with the Vafc and the FMU i used to have it and i loved it i tuned it by using a friends settings and then adjusted them to my own. Ran great but it has been pulled since then and i had to get a standalone i don't think i could idle 1000cc injectors with that setup . Just get it tuned man and you will be fine.

VTC_CiViC

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by silverbulletgsr &raquo;</TD></TR><TR><TD CLASS="quote">anybody know why it's cutting out?</TD></TR></TABLE>

You're proabably drowning the motor in fuel with 450's and a 12:1 FMU. Sure it's fine if you're pushing alot of pressure through large turbo, not for a stock GSR. Try pulling fuel out of the AFC and see what happens.

Muckman

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by porsche997 &raquo;</TD></TR><TR><TD CLASS="quote">I think your fmu is causing the problem. Your 12:1 fmu demand 12 psi of fuel pressure for 1 psi of boost. Your 255 fuel pump can't keep up with the fuel pressure. </TD></TR></TABLE>

What do you think creates the pressure in the fuel system? The fuel pump. The FMU/FPR only squeezes the return line. Maybe you think the 12:1 FMU makes the fuel pump, pump faster but it doesnt work that way...

porsche997dc2

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

that doesn't make any sense. we had cars going to 10.7 in the quarter w/ the fmu, intank pump, 370cc and vafc.

-Wallace </TD></TR></TABLE>
At 10.7 may be in the 1/8. 370cc injectors will max out 230 whp. How can you go 10s with just 370cc. You will need at least 400whp and a very very good suspension set-up and a very good driver.

I'm giving an advice from an experience and from what I learned a couple months back. My friend had the same problem 255 in-tank pump and 12:1 fmu. 310 injectors. He kept having fuel cut off. We couldn't not find out what cause that but later we want to see if it went away by putting a in-line pump. Instantly, the car ran like an animal. A couple months back, there was a ht member had the same problem, he or she also had 255 intank pump. After, putting back the in-line pump back, the fuel cut off went away.
12 x 8(psi of boost) =96 psi fuel pressure
Static fuel pressure = may be he's running 50 psi.
96 + 50 = 146 psi that needed to pump from the fuel pump.
255 lt/h pump is rated at 43 psi.
Even at 65 psi, the 255 pump lost about 20-30% of it's efficiency.
We're not talking about 1:1 fuel pressure but a 12:1+static fuel pressure.
I believe at 146 psi, the 255 intank pump can't keep up the with that kind of fuel pressure without the aid of a in-line pump. Many will disagree with me but it's all good. We're here to learn and from what we had experienced from working on your own car or friend's car. We just wait and see if this ht member has solved the problem and keep us posted.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99blackcivicSi &raquo;</TD></TR><TR><TD CLASS="quote">
Yeah thats funny a 255hl won't keep up considering cars that run 10s have that.
</TD></TR></TABLE>
I have never doubt that 255 in-tank pump can keep up. You can do it with big injectors (700cc-1000cc), most likely 1:1 fpr such as the aeromotive, paxton and static fuel pressure at aroung 40-50 psi. Actually, this is the set-up that I'm going to run.
For example, the guys that has 500whp with 255 in-tank pump.
It takes around 20-25 psi of boost for 500whp with racing gas, of course.
Static fuel pressure may be at around 50 psi and with 1000cc injectors.
50 + 25 = 75 psi of fuel presure that need to pump from the fuel pump.




Modified by porsche997 at 5:01 PM 12/26/2003