short power loss. any ideas???
short power loss. any ideas???
I'm having a problem on my 05 evo. When I step on the accelerator I get about a 200 rpm drop and then the rpms rise again like they should.
Any ideas???
Mods:
K/N cone filter
Dynoflash
3 TBE Aps Exhaust
Hallman MBC
Any ideas???
Mods:
K/N cone filter
Dynoflash
3 TBE Aps Exhaust
Hallman MBC
closed loop to open loop transition issue (from the tune), or possibly your not getting the extra fuel at initial throttle tip in that you're supposed to be getting. Do you have a way to data log injector duty cycle and timing?
Are you having any other driveability issues? That intake is notorious for causing driveability issues.
Are you having any other driveability issues? That intake is notorious for causing driveability issues.
Last edited by dubbleugly01; Nov 3, 2006 at 01:14 PM.
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Clutch????
Seriously, no way do the rpms go down first, then back up. That just can't happen. Are you sure the rpms don't go up first, then come back down when the clutch catches?
Seriously, no way do the rpms go down first, then back up. That just can't happen. Are you sure the rpms don't go up first, then come back down when the clutch catches?
Originally Posted by Warrtalon
Clutch????
Seriously, no way do the rpms go down first, then back up. That just can't happen. Are you sure the rpms don't go up first, then come back down when the clutch catches?
Seriously, no way do the rpms go down first, then back up. That just can't happen. Are you sure the rpms don't go up first, then come back down when the clutch catches?
im all ready in gear and rolling foot is already on the gas. im not shifiting into another gear, i just step on it for more accerleration and i get a slight drop in rpms (i watched it yesterday and today and it went down about 200 rpm). then they begin to climb again.
Originally Posted by dubbleugly01
closed loop to open loop transition issue (from the tune), or possibly your not getting the extra fuel at initial throttle tip in that you're supposed to be getting. Do you have a way to data log injector duty cycle and timing?
Are you having any other driveability issues? That intake is notorious for causing driveability issues.
Are you having any other driveability issues? That intake is notorious for causing driveability issues.
i have no other issues than that. It started about 2 weeks ago once it got colder here in chicago. I have no way of data logging the injector duty cycle and timing. I may just have to take it into ams and have them look at it. just wanted to see if this has happened to anyone else 1st.
Originally Posted by rodeo0808
i have no other issues than that. It started about 2 weeks ago once it got colder here in chicago. I have no way of data logging the injector duty cycle and timing. I may just have to take it into ams and have them look at it. just wanted to see if this has happened to anyone else 1st.
So you're cruising down the road at very light throttle, you give it more throttle input to pick up the speed and the car falls flat for a second, like a loss of power, or a stumble, or something like that, and then it picks up speed after that stumble just fine? That sounds like tuning to me. But, as others have pointed out, if the engine rpm doesn't match what the car is doing (ie rpms going up but the car isn't going faster, or vice versa... rpms dropping but the car isn't slowing down), it's most likely the clutch.
Originally Posted by dubbleugly01
it's fairly common for those that use piggybacks and tune their own cars. I would think dynoflash would have it down, but it could still be a tuning issue. This is of couse, assuming we are talking about the same issue.
So you're cruising down the road at very light throttle, you give it more throttle input to pick up the speed and the car falls flat for a second, like a loss of power, or a stumble, or something like that, and then it picks up speed after that stumble just fine? That sounds like tuning to me. But, as others have pointed out, if the engine rpm doesn't match what the car is doing (ie rpms going up but the car isn't going faster, or vice versa... rpms dropping but the car isn't slowing down), it's most likely the clutch.
So you're cruising down the road at very light throttle, you give it more throttle input to pick up the speed and the car falls flat for a second, like a loss of power, or a stumble, or something like that, and then it picks up speed after that stumble just fine? That sounds like tuning to me. But, as others have pointed out, if the engine rpm doesn't match what the car is doing (ie rpms going up but the car isn't going faster, or vice versa... rpms dropping but the car isn't slowing down), it's most likely the clutch.
What I underlined is exactly what happens. I was wondering if it was a tuning issue but I went through all last winter with the same tune and this did not happen. Thanks for the info though.
Why did you mention shifting when refuting the clutch diagnosis? A clutch does not show its wear when shifting...it shows it on an Evo when you hit peak torque, which is why we keep suggesting that this is the problem. If the clutch is slipping, then you will feel this rpm anomaly when you get on the gas and boost builds, because that is when you hit peak torque and overcome the clutch's ability to grab.
The way to put this to rest and ensure that it is or isn't the clutch is to go out and put the car in 5th gear at around 2000rpm then hammer the throttle. Just hold your foot down and watch the RPMs and/or boost. Right when you get to the low 3000s it should rapidly increase boost. If at this point, you see the rpms jump up without the car accelerating, then fall back down and grab to resume acceleration, then the clutch is slipping.
I still contend that there is NO WAY that the RPMs go down. That simply defies the laws of physics. If the car just stumbles, then it could be something as simple as plugs, but that would have no RPM anomaly.
The way to put this to rest and ensure that it is or isn't the clutch is to go out and put the car in 5th gear at around 2000rpm then hammer the throttle. Just hold your foot down and watch the RPMs and/or boost. Right when you get to the low 3000s it should rapidly increase boost. If at this point, you see the rpms jump up without the car accelerating, then fall back down and grab to resume acceleration, then the clutch is slipping.
I still contend that there is NO WAY that the RPMs go down. That simply defies the laws of physics. If the car just stumbles, then it could be something as simple as plugs, but that would have no RPM anomaly.
Originally Posted by Warrtalon
Why did you mention shifting when refuting the clutch diagnosis? A clutch does not show its wear when shifting...it shows it on an Evo when you hit peak torque, which is why we keep suggesting that this is the problem. If the clutch is slipping, then you will feel this rpm anomaly when you get on the gas and boost builds, because that is when you hit peak torque and overcome the clutch's ability to grab.
The way to put this to rest and ensure that it is or isn't the clutch is to go out and put the car in 5th gear at around 2000rpm then hammer the throttle. Just hold your foot down and watch the RPMs and/or boost. Right when you get to the low 3000s it should rapidly increase boost. If at this point, you see the rpms jump up without the car accelerating, then fall back down and grab to resume acceleration, then the clutch is slipping.
I still contend that there is NO WAY that the RPMs go down. That simply defies the laws of physics. If the car just stumbles, then it could be something as simple as plugs, but that would have no RPM anomaly.
The way to put this to rest and ensure that it is or isn't the clutch is to go out and put the car in 5th gear at around 2000rpm then hammer the throttle. Just hold your foot down and watch the RPMs and/or boost. Right when you get to the low 3000s it should rapidly increase boost. If at this point, you see the rpms jump up without the car accelerating, then fall back down and grab to resume acceleration, then the clutch is slipping.
I still contend that there is NO WAY that the RPMs go down. That simply defies the laws of physics. If the car just stumbles, then it could be something as simple as plugs, but that would have no RPM anomaly.
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