Boost spike hitting fuel cut?
23 December 2005, 10:06 AM
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Boost spike hitting fuel cut?
Hi Guys.
I have noticed recently that if I boot it in 4th and 5th I get smooth power and boost holding at about 0.8 bar. If however I need to do some overtaking and drop a gear or two and then boot it it feels as though I am hitting the fuel cut. This can be disconcerting when a safe overtake becomes a panick as the power you expect has disappeared!!!
Could this be boost spike? If so what can I do about it as it is spoiling a great car?
Thank you and and wishing you all a Merry Christmas.
Cheers. Mark.
By the way it is a my93 JDM WRX.
I have noticed recently that if I boot it in 4th and 5th I get smooth power and boost holding at about 0.8 bar. If however I need to do some overtaking and drop a gear or two and then boot it it feels as though I am hitting the fuel cut. This can be disconcerting when a safe overtake becomes a panick as the power you expect has disappeared!!!
Could this be boost spike? If so what can I do about it as it is spoiling a great car?
Thank you and and wishing you all a Merry Christmas.
Cheers. Mark.
By the way it is a my93 JDM WRX.
Last edited by scoobymark66; 23 December 2005 at 10:12 AM.
24 December 2005, 12:15 AM
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more likely spark plugs or coil packs.
Fuel cut won't happen until 0.9psi+ (14.xxpsi) and is more likely in high gears. If it is high rpm and high boost then spark issues are more likely.
Fuel cut won't happen until 0.9psi+ (14.xxpsi) and is more likely in high gears. If it is high rpm and high boost then spark issues are more likely.
24 December 2005, 10:45 AM
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Overboost in 4th and 5th has always happened with me at 16+psi. Which is just over 1 bar I suppose if you want to get metric. It can happen at lower revs if your boost solenoid and plumbing is gunged up with oil.
Do a search for overboost and find one of the many threads on it. See if it matches what you've experienced.
Do a search for overboost and find one of the many threads on it. See if it matches what you've experienced.
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