Loosing Boost at High RPM
#1
Loosing Boost at High RPM
I seem to be loosing boost at high RPM (when second turbo is suposed to kick in)
My mods
Power FC
HKS Downpipe
PFS SMIC
M2 CAI
Stock Sequentila
I have checked soleinois / TCA etc.
However, I am running very rich at mid to high rpm
Do you think this could be the cause ?
I thank u all in advance
My mods
Power FC
HKS Downpipe
PFS SMIC
M2 CAI
Stock Sequentila
I have checked soleinois / TCA etc.
However, I am running very rich at mid to high rpm
Do you think this could be the cause ?
I thank u all in advance
#4
King of the Duct Tape
Join Date: Feb 2001
Location: PA
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what boost are you running? the pfc has a rep for not being able to control much more than stock boost very well. when I run 10psi on mine its fine but at 1bar it drops off at high rpm. maybe you could borrow a boost controller?
#5
Eats, Sleeps, Dreams Rotary
Originally Posted by airborne
what boost are you running? the pfc has a rep for not being able to control much more than stock boost very well. when I run 10psi on mine its fine but at 1bar it drops off at high rpm. maybe you could borrow a boost controller?
#6
I am only running 10 psi
Mahjik: It has been pretuned by Steve Khan as an aproximation, ie. as I live in Greece he has just set it up according to what mods and specifications I told him - it is in no way his fault for the fact that it is not perfectly tuned as it was done on a best efforts basis...and to be honest he has done a pretty fine job considering the distance
In any case, I seem to be running very rich when the second turbo should kick in
I am going to try a map of a friend who has similar mods and see how it goes
Mahjik: It has been pretuned by Steve Khan as an aproximation, ie. as I live in Greece he has just set it up according to what mods and specifications I told him - it is in no way his fault for the fact that it is not perfectly tuned as it was done on a best efforts basis...and to be honest he has done a pretty fine job considering the distance
In any case, I seem to be running very rich when the second turbo should kick in
I am going to try a map of a friend who has similar mods and see how it goes
#7
Rotary Freak
Join Date: Dec 2002
Location: Slovenia, Europe
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What do you mean when your second turbo is supposed to kick in ?
Does it kick in or not ? If it doesnt come online then you have some disconnected vacuum hoses or a coupler.
Does it kick in or not ? If it doesnt come online then you have some disconnected vacuum hoses or a coupler.
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#9
Don't worry be happy...
iTrader: (1)
IMO you should go back to the basics...
Put everything back to stock (well except for the dp, too much of a pain) it should not be to hard since you just have the SMIC, intake, and PFC. what is that an hour's woth of work... don't just put back in your stock ECU since you have other mods and no boost controller to keep you below 10 psi.
See how the car boost, if it boosts fine then you know it's your PFC like others have stated. If not then at least you know it's not your PFC and you can continue the hunt from there.
Edit- I'm assuming you checked for boost leaks and stuff
Put everything back to stock (well except for the dp, too much of a pain) it should not be to hard since you just have the SMIC, intake, and PFC. what is that an hour's woth of work... don't just put back in your stock ECU since you have other mods and no boost controller to keep you below 10 psi.
See how the car boost, if it boosts fine then you know it's your PFC like others have stated. If not then at least you know it's not your PFC and you can continue the hunt from there.
Edit- I'm assuming you checked for boost leaks and stuff
#10
Lives on the Forum
Join Date: Dec 2001
Location: San Lorenzo, California
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The only way you can be making only 2 psi after the transition is a boost leak -- either through a broken check valve or missing line, or through a split coupler, etc. You say you've checked everything but it's obvious you haven't, as there is still a problem.
The PFC has nothing to do with this problem. Even with completely faulty electronics, if the turbo control system is working, you will still get 7 psi. As with the other current thread, I would check the pre-control routing.
The PFC has nothing to do with this problem. Even with completely faulty electronics, if the turbo control system is working, you will still get 7 psi. As with the other current thread, I would check the pre-control routing.
#11
Mr. Links
iTrader: (1)
Originally Posted by Riccardo
I am only making c. 2psi of boost at c. 5500 rpm when I start with 8 to 10psi
I would start by looking at:
* Charge control & charge relief systems
* Check valve for the pressure chamber
http://www.autosportracetech.com/RX-...leshooting.htm
Good luck!
#12
Spooling
iTrader: (7)
Originally Posted by airborne
what boost are you running? the pfc has a rep for not being able to control much more than stock boost very well. when I run 10psi on mine its fine but at 1bar it drops off at high rpm. maybe you could borrow a boost controller?
#14
Rotary Freak
Join Date: Aug 2002
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check the vacuum lines under the crossover pipe that lead down to the wastegate and prespooler. i had a similar problem and it was those lines. just replace them and zip tie them down if you have some spare hose. mine was a minor crack that i couldn't see until I took the hose off.
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