Hesitation at WOT now?
Apr 21, 2005, 03:29 PM
#31
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Originally Posted by HiHeatEVO
boost cut is not like hitting a brick wall...that is fuel cut. Sounds like boost cut. Are you on stock bov? or somethin' vta?
Originally Posted by Event-Horizon
What spark plugs are you guys running? Type and gap are very important with the EVO.
Originally Posted by BOOSTEZ
It more than likely has to do with the tune. -M
BoostEZ - PM me when you get a chance.
Last edited by 954DRGSR; Apr 21, 2005 at 03:42 PM.
Apr 21, 2005, 03:58 PM
#32
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Originally Posted by 954DRGSR
I will empty my tank Saturday and run race gas (110 leaded) and see if its a tuning issue.
-M
Apr 21, 2005, 04:03 PM
#33
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Originally Posted by BOOSTEZ
If you run race gas, you are more than likely to still see the problem. If the problem is indeed going too rich for that split second in the rpm band, then using race gas won't help.
-M
-M
Try getting a data log of this, check the fuel pump, fuel connections, timing marks on the cam gears, and all boost and intake hoses.
Last edited by SilverEvo8owner; Apr 21, 2005 at 04:05 PM.
Apr 21, 2005, 04:08 PM
#34
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Originally Posted by 954DRGSR
I have this exact same problem. I have a stage 1+++ V3 - Xede & Xedeflash. Typically only happens in 4th or 5th after 3,000 RPM at WOT. I have stock airbox and filter.
I've tried the following to no avail:
1. Pulling over and shutting down then restarting the car.
2. I've let the car warm up - only punching it after driving for 15 or more minutes.
3. Tried three different gas stations, also tried octane boosters added to gas tank.
Only additional thing I can see is that my boost gauge oscillates a couple of PSI when this happens. Once past this section of the rev range, I jump back to 24PSI. It probably happens for less than half a second. Also when I easily roll on throttle it does not happen. Its only at WOT.
I doubt its the clutch, I would see slippage in other areas.
Very frustrating.
What EGT's are you guys seeing that have their sensors in the exhaust manifold (pre turbo)?
I've tried the following to no avail:
1. Pulling over and shutting down then restarting the car.
2. I've let the car warm up - only punching it after driving for 15 or more minutes.
3. Tried three different gas stations, also tried octane boosters added to gas tank.
Only additional thing I can see is that my boost gauge oscillates a couple of PSI when this happens. Once past this section of the rev range, I jump back to 24PSI. It probably happens for less than half a second. Also when I easily roll on throttle it does not happen. Its only at WOT.
I doubt its the clutch, I would see slippage in other areas.
Very frustrating.
What EGT's are you guys seeing that have their sensors in the exhaust manifold (pre turbo)?
Apr 21, 2005, 04:22 PM
#35
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Originally Posted by SilverEvo8owner
But by running race gas that would rule out a timing/knock issue
Try getting a data log of this, check the fuel pump, fuel connections, timing marks on the cam gears, and all boost and intake hoses.
Try getting a data log of this, check the fuel pump, fuel connections, timing marks on the cam gears, and all boost and intake hoses.
-M
Apr 21, 2005, 04:31 PM
#37
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Originally Posted by SilverEvo8owner
ive seen cam gears 1 tooth off on stock cars
If you can get a datalog of it, it should help to give some idea of what it is
If you can get a datalog of it, it should help to give some idea of what it is
-M
Apr 21, 2005, 07:11 PM
#39
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Originally Posted by SilverEvo8owner
Are you on stock injectors or fuel pump?
The Xede has been tuned at WOT in OL by Shiv so I am sure there is no problem there...Just a theory
Apr 22, 2005, 08:53 AM
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Originally Posted by BOOSTEZ
No, I know the difference with the ECU pulling timing.. the car will fall flat on it's face and stay that way up to redline. It's like a hiccup but it's not turbo lag either. Turbo lag is when I mash on the gas and the car takes a second before it accelerates.
Why could it not be that the car is too rich at a certain rpm/load?
-M
Why could it not be that the car is too rich at a certain rpm/load?
-M
nebo
Apr 22, 2005, 09:05 AM
#42
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Originally Posted by Dyno4mance
he has stock injectors, Walbro 255, ported cylinder head, ported intake manifold/throttlebody...it maybe the transition from closed to open loop that is screwing with the thing as I am sure the VE of the motor is very different now....
The Xede has been tuned at WOT in OL by Shiv so I am sure there is no problem there...Just a theory
The Xede has been tuned at WOT in OL by Shiv so I am sure there is no problem there...Just a theory
Apr 22, 2005, 09:24 AM
#43
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Originally Posted by BOOSTEZ
But the car's are doing this completely stock and just with a little over 4k miles.. I seriously doubt it's any of those things.
-M
-M
Apr 22, 2005, 05:47 PM
#44
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Originally Posted by EVOtagger
if cars are doing it completely stock, then why in the world do you think it has anything to do with your xflash tune????
-M
Apr 22, 2005, 07:28 PM
#45
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my car has that too, Its like a jerk forward then all the power back on . My car only has a MR DV . It did it once and the Check engine light came on , It pulled a over boost code , Im thinking it could be my waste gate not woorking 100% ,