Can't boost over 5-6psi PLEASE HELP

[Captain KRM P5]

i dont want to be buying s*** and it not fix the problem. thats why im hesistant to spend 300+ on a WB guage only to find out i AM running lean...which although the wideband is a great tool, if i AM running lean, then that money was a waste of resources for the time being.

so far i have been told EVERYTHING could be wrong...at this point if i followed everyones suggestions i would replace just about everything but the turbo and manifold itself.

dont get me wrong, i appreciate everyones help, its just there is no concensus as to what is wrong.

i want a new inline pump anyhow - however - i just simply dont understand how mike could be boosting 11lbs and im boosting 5 and cant stay rich and he can...that doesnt make sense...just like this whole thing worked in jamies car and not in mine...i know im not great with this s*** but after all ive been through i feel i at least know what im talking about and hell no one seems to know what the problem is.

at 5psi the pump will supply enough gas on its own - 60 psi and probably no more than that. Once you go higher, you need more fuel pressure to match the increased boost pressure which your stock pump will not be able to supply.

 

[mypfizzle]

matt.. what kind of a/f gauge do you have? is it hooked to the blue / pink wire? -=P

 

[mypfizzle]

didnt you say jamie had it set for 12psi per pound of boost instead of 10? thats an extra 10 psi in fuel pressure.. maybe that is whats bumpin u over the edge? can u adjust the fmu back down to 10psi per pound? as a temp fix?
cus jamie was running a fuel pump so he could pump more fuel.. hence the reason it was changed up to 12psi im assuming?

 

[Matthew]

at 5psi the pump will supply enough gas on its own - 60 psi and probably no more than that. Once you go higher, you need more fuel pressure to match the increased boost pressure which your stock pump will not be able to supply.

ok but i must ask again like the annoying moron that i am: why can some people put 11lbs or 9 or whatever and i cant even really do 5

 

[changedman]

lol myp.

we're going to the liquor store to buy ELECTRICAL TAPE (rofl)

 

[Matthew]

matt.. what kind of a/f gauge do you have? is it hooked to the blue / pink wire? -=P

no mine is just hooked tothe blue wire..see the blue wire is blue/pink on the first part of the harness and then its blue on the other part of the harness...i would imagine it shouldnt make a difference.

 

[Captain KRM P5]

(mswerd) I alwayz had problems with them..i only solder now!

Chas

Flyin' Protege and more than a few other companies swear by clamping wires only. I tend to agree but different strokes for different folks...

 

[Little Beavis]

damn thanks for all the help guys...now the consensus seems to be its the fuel pump.

NOW?

ok but i must ask again like the annoying moron that i am: why can some people put 11lbs or 9 or whatever and i cant even really do 5

Well, maybe you can borrow their fuel pump and then you can run 11 or 9 or whatever.

 

[mypfizzle]

if u get a chance.. and ur bored.. just run it to the blue with pink.. for s**** and giggles.. a nice long temp wire.. that when it doesnt work u can throw away. -=P

 

[Matthew]

NOW?


Well, maybe you can borrow their fuel pump and then you can run 11 or 9 or whatever.

well originally it was a multitude of things...i wasnt trying to be a dick bro, just trying to figure things out from every angle.

 

[acidbug]

well it still doesnt work...though at 6psi i can boost full throttle over around 4500 rpms i think...no red, all green.

this s*** is pissing me off. ive hit lean so many times testing this car my engine is prolly already shot.

ive tested and retested all the wires to the voltage clamp...i yanked and pulled and twisted and they are secured firmly inside the butt connectors...ive turned the car on and listened for vacuum leaks anywhere i can but i cant find anything at all.

all the vacuum lines are on their own line except for one, and the fmu is on the brake booster line.

im about this <--> close to selling everything on this car and turning it back to stock, and then trading in the car on something else that works.

if it is the voltage clamp, what can i do to get rid of the ******* thing and put something in its place? its obviously a bad item since it went bad on jamies car, and he bought a new one and now it still doesnt work. all the wires were hooked up correctly, i have checked about 300 times, and if you look at the directions and my pictures you can see that is the case...so its not like i hooked it up to the wrong wires or anything.

Matthew...calm down...i felt the same way after installing the my kit..and having my car stall like crazy!

There will alwayz be kinks that you will have to work through..

From the sound of this...You have a major problem...Running lean..can blast a motor..when running boost..the a/f guage you have should be fine...if you read red..you lean..if you readin green your ok!

There is no vaccum leak that would cuase you to run lean..if anything you should run richer b/c you are getting less air and same amount of fuel!

1 of 4 things is obviously wrong!

1: You haven't tapped the fmu properly (aka boost line).
Which would cause the fmu not to give proper fuel levels based on boost (psi)
2: The FMU Hasn't been adjusted properly (aka little springs which control how much fuel to how much boost)
3: You might have hooked the fuel lines incorrectly in the fmu...(aka you might have in as out and out as in)
4:The FM Voltage Clamp you have is bunk.

My suggestion is to get an mpi unit..or Purchase a new FM Voltage Clamp!

Chas

 

[Captain KRM P5]

Aw man, should have given me a ring

A side note to your threadjack, Flyin' Protege sent their ECU out for reprogramming and had it sent back 6 months later with a "no way" note attached. Hope you have better luck.

AMEN!


Hey, I was just in Grayslake today (twice. . .)

Got the MP3 ECU code dumped onto a computer with a "promise" that they could reprogram it in the next 30 days. . .woohoo. . .we'll see. . .anyway, sorry for the threadjack.

 

[MP3skaterNC]

well i think since the other things have been gone over many times. the gauge, the volt clamp, the fmu, that only leaves the fuel pump in the system.

As for ghost running 11psi or whatever on the stock pump, Im not too sure about that at all, 8psi i can see, but that is straining a really strong stock pump, but 11 is pretty high for stock fuel pump, its high for an fmu period.

 

[Matthew]

if u get a chance.. and ur bored.. just run it to the blue with pink.. for s**** and giggles.. a nice long temp wire.. that when it doesnt work u can throw away. -=P

on my list of things to do tommorrow...dammit i have to go to the field on tuesday and then on thurs my mom and sis come into town for only 4 days then back to the field for ten...but at least i can order the pump if necessary and it will be there when i get back.

 

[acidbug]

at 5psi the pump will supply enough gas on its own - 60 psi and probably no more than that. Once you go higher, you need more fuel pressure to match the increased boost pressure which your stock pump will not be able to supply.

(mswerd)

I am proof running 5psi intercooled..and running rich!

That's why i am plannin on installin my inline fuel pump soon!
(spin)

 

[Captain KRM P5]

well i think since the other things have been gone over many times. the gauge, the volt clamp, the fmu, that only leaves the fuel pump in the system.

As for ghost running 11psi or whatever on the stock pump, Im not too sure about that at all, 8psi i can see, but that is straining a really strong stock pump, but 11 is pretty high for stock fuel pump, its high for an fmu period.

prototype BEGI turbo kits ran at 8 psi without inline pumps for months without problems before they realized the stock pumps eventually were not strong enough to make do for the added boost. You likely wouldn't audibly or visibly detect any damage for some time if the same holds true here.

 

[1sty]

also i have stock fpr...and no i dont have aux fuel pump but supposedly jamie was running this kit with no problems...i think he might have an inline fuel pump though im not sure.

After a few months of boosting my pump couldn't handle more then 4 PSI any longer. Also the factory pump mearly needs to meet a range to pass. It something like 65-98 PSI so your factory pump could be anywhere in that range. Mine was about 80 PSI max originaly then fell to 70 PSI. Thats when I added the fuel pump. Also doesn't the FMU require a different springs depending on the boost level you are running?

Unfortunily I don't know much about the FMU only the BEGI RR-FPR.

 

[mypfizzle]

and look at the bright side.. in the field u wont need to drive ur car -=P

 

[acidbug]

After a few months of boosting my pump couldn't handle more then 4 PSI any longer. Also the factory pump mearly needs to meet a range to pass. It something like 65-98 PSI so your factory pump could be anywhere in that range. Mine was about 80 PSI max originaly then fell to 70 PSI. Thats when I added the fuel pump. Also doesn't the FMU require a different springs depending on the boost level you are running?

Unfortunily I don't know much about the FMU only the BEGI RR-FPR.

My cars fuel pump made a whining noise..when i had an fmu on my car..thought the fuel pump was gonna die..so immedaitely went with mpi unit...and havne't had problems since!

Chas

 

[1sty]

That sounds like you had the FMU run backwards so that it was resisting fuel flow. Like I said though I can't help much for an FMU. I just don't have experience with it.

Its not something simple like using the fuel feed line instead of the return line it?