STILL BOOSTING PROBLEM
#1
STILL BOOSTING PROBLEM
my 97 impreza import sti, mods decat and airfilter, once warm and boosted quite hard a few times, vehicle jults violently on high boost and engine light comes on, then goes out after a few minutes of cruising speed, previoulsy had a gems ecu fitted but standard put back on, ive cleaned the boost controller on the osf wing panel and vacuum pipes off this to the turbo and inlet manifold, has a standard recirc d/v too, not sure where to go, because its not all the time, and whether a new ecu and programme would benifit.
advice would be bludy helpful as im too scared to drive hard.
advice would be bludy helpful as im too scared to drive hard.
#2
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Sounds like its hitting the boost limit/boost-fuel cut. Its a pre set safety device on the car to stop you overboosting.
The gems ECU probably had a higher fuel/boost cut off point meaning you could have more boost, eg: if the limit on the gems was say 1.5bar the fuel cut/boost cut would be about 1.6bar.
The standard ecu limit is probably 1.1-1.2bar and fuel/boost cut would be approx 1.3bar.
With the decat and other mods the boost MAY have risen slightly as now there is less back pressure and more boost flow
I think
The gems ECU probably had a higher fuel/boost cut off point meaning you could have more boost, eg: if the limit on the gems was say 1.5bar the fuel cut/boost cut would be about 1.6bar.
The standard ecu limit is probably 1.1-1.2bar and fuel/boost cut would be approx 1.3bar.
With the decat and other mods the boost MAY have risen slightly as now there is less back pressure and more boost flow
I think
#3
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I don't mean to hijack this post but I think I have a similar problem. I've noticed now on occasion when driving hard when I let off the boost it jolts fairly badly which it never used to do. I lost my map setting after an engine rebuild however I still have the Walbro fuel pump fitted. Could this be the cause?
Thank you.
Thank you.
#4
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I don't mean to hijack this post but I think I have a similar problem. I've noticed now on occasion when driving hard when I let off the boost it jolts fairly badly which it never used to do. I lost my map setting after an engine rebuild however I still have the Walbro fuel pump fitted. Could this be the cause?
Thank you.
Thank you.
#5
ive now changed the restrictor pin in the vacuum pipe bigger opening, went really well for bit then once boosted hard 5 or 6 times bludy jerked again! not sure what next, its only decat and induction filter??
#6
boost gauge fitted, all vacuum hoses replaced, running 0.9 bar at about 3500 to 4000rpm then creeps to nearly 1 bar at about 5.500rpm, just wondering could it be the boost sensor?? just seems electrical as it happens intermeadiatly, i was booting it for quite a while the other day was fine! then turned it off for half hour went back out booted it a few times and happened again, possible actuator mayb? really frustrated now
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