I just boosted my MP3 and im have some issues when strat to build boost my car start to spit and spuder like it has no gas andf i dont know way can some one help me out i still have stock injectors and feul pump so i dont know if thats the issue or not can some one please give me some info (gah)
Can someone help me out
- Thread starter jasbadmp3
- Start date
Spiced MSP
Member
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- 2016 Peterbilt 579
you needa tune. Im not to familiar with the MP3 setup but maybe the SSAFC or SSFAC+MSP ECU.
KrayzieFox
Member
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- 01 MP3 Turbo
Nope, they're the same.
I would make sure you have your MAF oriented properly. What is your total setup? Stock intake manifold? What kinda FMIC? Exhaust? BOV/BPV? Is your MAF on the intake or the cold pipe?
KrayzieFox
Member
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- 01 MP3 Turbo
Stock plugs in the MP3 and stock plugs in the MSP aren't the same. MSP requires a step colder plugs.
Go get yourself some ZFR6F-11 NGK plugs and gap them to .030-.032. I don't think they're the cause of your issues, I have a feeling you're venting the BOV with your MAF on the intake, but you should have the proper plugs in there anyway.
Go get yourself some ZFR6F-11 NGK plugs and gap them to .030-.032. I don't think they're the cause of your issues, I have a feeling you're venting the BOV with your MAF on the intake, but you should have the proper plugs in there anyway.
msp.
KrayzieFox
Member
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- 01 MP3 Turbo
Yea your problem is exactly what I thought it would be. You can't vent if you leave the MAF on the intake cuz the MAF is reading a certain amount of air but a good portion of that is vented, so the ECU never adjusts the amount of fuel and your car stalls.
To fix it you will need to recirculate the air back into the intake (recommended), or if you want to keep venting then move the MAF to the cold pipe after the BOV.
And your lean spot when entering boost is normal, it's a MSP ECU thing. There is really no way around it besides a standalone ECU to replace the MSP one.
Neither are really that good in all honesty. The MSP ECU is better cuz it allows you to use a piggy back such as the SS AFC to get rid of the god awful fuel cut it came programmed with, but you still can't tune around the lean spot at throttle tip-in. The P5 ECU can be used with a o2 sensor voltage clamp and adjustable fuel pressure regulator and it doesn't have lean tip-in issues, but you are VERY limited when it comes to tuning.
I've used both setups and they're about the same. I guess the MSP ECU is better since it allows for the use of piggy backs. The best option is a standalone of course. But for a street driven Protege, the MSP will suffice.
Wagonbacker9
Member
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- 2004 'Hoe
MSP is the ONLY one that will handle boost properly without something like a RRFPR, which is really not a very good solution for fuel management. it will work (auto trans guys don't have any other option really), but you'll never get a GOOD tune.
more to the point though:
I think you need to go through everything and double check your work. plumbing, wiring, vacuume lines, everything. It should not go lean in boost, so theres definitely a problem. venting the BOV after the MAF will not cause your issue. I've run that way, and really the only ill effect is the car will likely stall due to too much fuel if you blow off and then let it fall to idle. It will not cause a lean condition, so something else is definitely going on.
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ok well i change the maf location and that didnt fix the problem it alomst acts worst then before. changed to the msp ngk plugs gaped to 30 and still the problem goes on, I also think it may be a vac problem but im pretty sure they are on right any one have a vac diagram they know of. thanks again guys for all you input
Wagonbacker9
Member
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- 2004 'Hoe
you should be pulling 22ish in/hg at idle. if you're not, start there. then check all of your couplers wires and lines, etc.. you have a way more significant problem than plugs or maf location
