gxl turbo swap help
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gxl turbo swap help
well i swapped complete s4 turbo 2 motor and drivetrain into my s4 GXL i only changed the engine harness the dash harness i kept and the alt, started harness that goes on the driver side i kept on there i switched out the stock fuel pump and put an fd one and i also put 680cc secondaries everything else is stock its starts up fine drives smooth but i cant get it to boost im not sure is even boosting im getting a boost gauge soon but im trying to figure out why isnt it building pressure i diconected my actuator and the car felt the same not sure if the door is stuck open or anything else that would cause this im stumped
help please motor came out of an 87 and my gxl is also the same year
help please motor came out of an 87 and my gxl is also the same year
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yeah its turbo ecu turbo afm turbo pressure sensors both of them the one under the hood and the other one next to the passenger door, true i am just going on feel and sound but it just doesnt feel like its building boost
#4
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If it is not building any boost, possible sources are: a BOV stuck open, wastegate stuck open, or a large leak in the intake piping.
Also, running 680cc secondaries on the stock ECU means you'll have a large hesitation around 3800 RPM and excessively rich mixtures under boost. Using an Rtek 1.7 chipped ECU will work a lot better.
Also, running 680cc secondaries on the stock ECU means you'll have a large hesitation around 3800 RPM and excessively rich mixtures under boost. Using an Rtek 1.7 chipped ECU will work a lot better.
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ok well i checked for any boost leak none at all i checked the bov and its not stuck open although when i took out the UIM i checked all the plugs on the injectors and primary 1 was a little loose so i pushed it in, replaced everything carefully then noticed the connector to the BAC valve was missing one of the wires in the clip so i stripped it and the black wire was pulled down and so i pushed it back inand connected it now that i put everything back together i took it for a run and i felt boost but not for long i drove on the street and i kept feeling it less and less till it was back to how it was.......im not sure if one of those two i messed with got loose again but would that even affect it to not boost? or could the symptom be something else
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#8
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The BAC won't have anything to do with acceleration/boost, but an unplugged secondary injector could cause fuel cut in the mid-range. If you're uncertain that the plugs are staying on, backprobe the injector wires at the ECU. LG, LG/W, LG/B. LG/R on the small ECU plug are for the injectors. All of them should have 12V with the ignition 'ON'. If a primary injector plug came loose, the engine would just stall or run horribly rough.
I still think you need to get a boost gauge so you have some idea of how much pressure is being produced. If you're on the wastegate spring alone, it will only be about 5-6psi.
I still think you need to get a boost gauge so you have some idea of how much pressure is being produced. If you're on the wastegate spring alone, it will only be about 5-6psi.
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hmm i c ok ill check out the the wires from the ecu and yeah im picking up a boost gauge this weekend. but again for example i went to food4less went inside then came out not much time i got in my car about the first 5 min i can feel boost and as the engine gets more warmed up i dont feel the boost anymore
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ok now i got a boost gauge and it is boosting 5.something pounds but the car goes nowhere could it be that my downpipe is clogged??? i got the stock one or could it be the injectors....
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you do know what im trying to say tho, im going to try and get a downpipe and if that doesnt work i will try cleaning the injectors. hopefully that fixes the problem thanks
#15
Fix the leading coil problem first, then notice your increase in power.
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