Am I getting fuel cut?
30 January 2014, 03:35 AM
#1
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Am I getting fuel cut?
I've never had this on my previous Imprezas so I'm not sure what it is TBH.
It only seems to happen in 4th or 5th, if I'm driving at a steady speed and accelerate fully you can hear and feel the turbo spooling but then the power jerks on/off several times.
The car is a 98 UK turbo running approx 320 BHP and has been mapped by JGM.
Any ideas guys?
It only seems to happen in 4th or 5th, if I'm driving at a steady speed and accelerate fully you can hear and feel the turbo spooling but then the power jerks on/off several times.
The car is a 98 UK turbo running approx 320 BHP and has been mapped by JGM.
Any ideas guys?
30 January 2014, 05:46 AM
#3
I had a similar thing.
Happened when I was tracking the car and on WOT, would get total power loss at about 5k (I think) in fourth gear.
It was fuel cut caused by over-boosting.
Get JGM to take a look mate.
Happened when I was tracking the car and on WOT, would get total power loss at about 5k (I think) in fourth gear.
It was fuel cut caused by over-boosting.
Get JGM to take a look mate.
30 January 2014, 09:20 AM
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As above, it's like hitting a brick wall when it happens and no you don't get any indication from the ECU that there is a problem.
Other option is fuel starvation, does it do it with a full tank of petrol?
Other option is fuel starvation, does it do it with a full tank of petrol?
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30 January 2014, 08:08 PM
#9
Unmapped 12.4s @ 105
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Location: Newcastle. 330bhp-289lb/ft @ 1bar boost - 12.4s @ 105mph
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WTF? 
Might be wise.
However, depending on what boost it was mapped to it may not take much of an overboost to hit fuel cut. EG; It's mapped to 1.5bar, limit of the later MAP sensor is IRO 1.7bar, and depending on where the fuel cut threshold has been seen, say 1.6 bar, you might not notice the overboost on a boost gauge.
For arguments sake, if it was mapped to 1.2bar, and it was showing on a gauge 1.6bar, you'd probably notice that.
However, depending on what boost it was mapped to it may not take much of an overboost to hit fuel cut. EG; It's mapped to 1.5bar, limit of the later MAP sensor is IRO 1.7bar, and depending on where the fuel cut threshold has been seen, say 1.6 bar, you might not notice the overboost on a boost gauge.
For arguments sake, if it was mapped to 1.2bar, and it was showing on a gauge 1.6bar, you'd probably notice that.
30 January 2014, 09:01 PM
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WTF?
Might be wise.
However, depending on what boost it was mapped to it may not take much of an overboost to hit fuel cut. EG; It's mapped to 1.5bar, limit of the later MAP sensor is IRO 1.7bar, and depending on where the fuel cut threshold has been seen, say 1.6 bar, you might not notice the overboost on a boost gauge.
For arguments sake, if it was mapped to 1.2bar, and it was showing on a gauge 1.6bar, you'd probably notice that.
Might be wise.
However, depending on what boost it was mapped to it may not take much of an overboost to hit fuel cut. EG; It's mapped to 1.5bar, limit of the later MAP sensor is IRO 1.7bar, and depending on where the fuel cut threshold has been seen, say 1.6 bar, you might not notice the overboost on a boost gauge.
For arguments sake, if it was mapped to 1.2bar, and it was showing on a gauge 1.6bar, you'd probably notice that.
Great, I'll drop JGM a message and see if he can take a look then.
Think I'll fit some gauges anyway though.
30 January 2014, 09:05 PM
#11
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WTF?
Might be wise.
However, depending on what boost it was mapped to it may not take much of an overboost to hit fuel cut. EG; It's mapped to 1.5bar, limit of the later MAP sensor is IRO 1.7bar, and depending on where the fuel cut threshold has been seen, say 1.6 bar, you might not notice the overboost on a boost gauge.
For arguments sake, if it was mapped to 1.2bar, and it was showing on a gauge 1.6bar, you'd probably notice that.
Might be wise.
However, depending on what boost it was mapped to it may not take much of an overboost to hit fuel cut. EG; It's mapped to 1.5bar, limit of the later MAP sensor is IRO 1.7bar, and depending on where the fuel cut threshold has been seen, say 1.6 bar, you might not notice the overboost on a boost gauge.
For arguments sake, if it was mapped to 1.2bar, and it was showing on a gauge 1.6bar, you'd probably notice that.
Not joking about smashing gearbox especially if a classic box. The sudden power on power off puts massive torque through the drive train.
Last edited by terzoscooby; 30 January 2014 at 09:07 PM.
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