Hesitation
26 October 2012, 10:25 AM
#5
Only reason I ask is that my Blob STi is a bit like this, and is down to the bigger VF35 turbo, where as the WRX has a smaller TD04/05 turbo.
The Scooby has never known to be quick off the line unless you want to rev past 3K and dump the clutch. (Note: doing this a lot will shorten the clutch life)
The turbo on a none Prodrive Performance Pack or remapped engine will come on around 3K RPM. On a PPP car this comes down to 2.5/2.8K RPM.
The fix? A remap of the car engine to allow the turbo to come on earlier or something called anti-lag. Or even a different Turbo and remap will help.
The other thing to consider is that the clutch on the Impreza has something called Clutch judder, so first thing in the morning when the car is cold you may find the car more hesitant becuase of the clutch as well.
02 November 2012, 03:58 AM
#6
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Is the car an STI?
Only reason I ask is that my Blob STi is a bit like this, and is down to the bigger VF35 turbo, where as the WRX has a smaller TD04/05 turbo.
The Scooby has never known to be quick off the line unless you want to rev past 3K and dump the clutch. (Note: doing this a lot will shorten the clutch life)
The turbo on a none Prodrive Performance Pack or remapped engine will come on around 3K RPM. On a PPP car this comes down to 2.5/2.8K RPM.
The fix? A remap of the car engine to allow the turbo to come on earlier or something called anti-lag. Or even a different Turbo and remap will help.
The other thing to consider is that the clutch on the Impreza has something called Clutch judder, so first thing in the morning when the car is cold you may find the car more hesitant becuase of the clutch as well.
Only reason I ask is that my Blob STi is a bit like this, and is down to the bigger VF35 turbo, where as the WRX has a smaller TD04/05 turbo.
The Scooby has never known to be quick off the line unless you want to rev past 3K and dump the clutch. (Note: doing this a lot will shorten the clutch life)
The turbo on a none Prodrive Performance Pack or remapped engine will come on around 3K RPM. On a PPP car this comes down to 2.5/2.8K RPM.
The fix? A remap of the car engine to allow the turbo to come on earlier or something called anti-lag. Or even a different Turbo and remap will help.
The other thing to consider is that the clutch on the Impreza has something called Clutch judder, so first thing in the morning when the car is cold you may find the car more hesitant becuase of the clutch as well.
On the APFC you could advance the timing to mybe +2 or +3 and fuel enrichment frm 1k rpm to 3k rpm
02 November 2012, 02:44 PM
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02 November 2012, 05:23 PM
#9
many reasons possible here.
Could also be lambda sensor. It goes well after 3k because ecu runs a closed loop then?
Had a similar thing. I'd try disconnect the lambda and see if it makes any difference. if it doesn't - it maybe a lambda then.
Could also be lambda sensor. It goes well after 3k because ecu runs a closed loop then?
Had a similar thing. I'd try disconnect the lambda and see if it makes any difference. if it doesn't - it maybe a lambda then.
Last edited by Codders; 02 November 2012 at 05:25 PM.
02 November 2012, 06:57 PM
#10
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Not had a chance to give it a good blast, the air filter was really dirty!
Forgot to add carried out ECU reset also
Will know after the weekend.
Last edited by Inviroman; 02 November 2012 at 06:59 PM.
03 November 2012, 08:43 AM
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Mine - 51 plate - had a hesitation when accelerating, I had a K&N fitted... changed it for a Perrin short ram and that solved it, so it could have been a dirty filter, maf connections, plug/socket.
Big differance now anyway...
best of luck with it.. feckin frustrating!
Big differance now anyway...
best of luck with it.. feckin frustrating!
10 November 2012, 07:04 PM
#14
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Some help needed chaps:
Today when pulling away slowly (not on boost) and driving under 3k the car is hesitating, like miss firing but it is not, if that makes sense?
Once on boost all is fine, also noticed once on boost and say change gear at 5k then under acceration it hesitates for couple of seconds (still above 3k) then of she goes.
Any ideas.
Cheers.
Today when pulling away slowly (not on boost) and driving under 3k the car is hesitating, like miss firing but it is not, if that makes sense?
Once on boost all is fine, also noticed once on boost and say change gear at 5k then under acceration it hesitates for couple of seconds (still above 3k) then of she goes.
Any ideas.
Cheers.
10 November 2012, 08:55 PM
#15
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Some help needed chaps:
Today when pulling away slowly (not on boost) and driving under 3k the car is hesitating, like miss firing but it is not, if that makes sense?
Once on boost all is fine, also noticed once on boost and say change gear at 5k then under acceration it hesitates for couple of seconds (still above 3k) then of she goes.
Any ideas.
Cheers.
Today when pulling away slowly (not on boost) and driving under 3k the car is hesitating, like miss firing but it is not, if that makes sense?
Once on boost all is fine, also noticed once on boost and say change gear at 5k then under acceration it hesitates for couple of seconds (still above 3k) then of she goes.
Any ideas.
Cheers.
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