_Madman_
15+ Year Contributor
- 327
- 1
- Oct 14, 2004
-
Riga,
Europe
I recently replaced the transmission on my car, and after driving a little, it seems that the car has some problems.
1) The car seems to be very rough when you apply or release throttle. Say you cruise at 2k rpms, apply throttle then instantly, release it, reapply again, it feels like you're launching and getting fuel cut or something. The hits are very rough.
2) Idling seems to be rougher than it should be, I have polly mounts, but still, the vibration seem to be uneven.
3) With boost set at 16psi, I get a very crude hesitation, boggling as soon as peak boost hits (+/-3000 RPM range). Only seem to happens in 4th and 5th gears, although it could be that others are doing the same thing too.
It's hard to say if the short vibration during 2nd gear at the same range is because of the wheelspin and Quaife locking the wheels, or the same issue. The car revs quite fast through that range, but also feels a bit sleepy there.
In 5th gear I can get a 2 second hammering if I want to. And it's not like a fuel cut that shuts the car down completely. 5th gear, cruising at 55mph, apply throttle, car starts to shake. RPMs seem to stop climbing at the same time too.
When I adjusted the boost a little lower 14.5 psi or something, the hessitation is less pronounced but it's still there.
The cars upgrades are in my signature and are updated. I also searched the forums, but all the threads I've read through seem to indicate that half of the car has been replaced and no post to indicate the success or failure and the real culprit.
I don't want to spend huge amounts of money on replacing everything, so I'm hoping someone can tell me what to look for first.
But for now it seems that pretty much anything can be faulty.
I can also log the car, and I have few EvoScan logs done, but the car has weird experimental ECU from Mitsubishi and therefore not all parameters can be trusted, and it's hard to say if they're accurate.
I attached short EvoScan log from bogging at 5th gear below (rename .xml to .csv). The log has been done using Ceddys XML profile for EvoScan. Unfortunately, I don't have wideband so AFRs are unknown during bogging.
How can I narrow down is it a spark issue, fuel delivery issue or something else. How can I tell if it's preignition, detonation or something else? What sort of data is missing to understand the problem?
1) The car seems to be very rough when you apply or release throttle. Say you cruise at 2k rpms, apply throttle then instantly, release it, reapply again, it feels like you're launching and getting fuel cut or something. The hits are very rough.
2) Idling seems to be rougher than it should be, I have polly mounts, but still, the vibration seem to be uneven.
3) With boost set at 16psi, I get a very crude hesitation, boggling as soon as peak boost hits (+/-3000 RPM range). Only seem to happens in 4th and 5th gears, although it could be that others are doing the same thing too.
It's hard to say if the short vibration during 2nd gear at the same range is because of the wheelspin and Quaife locking the wheels, or the same issue. The car revs quite fast through that range, but also feels a bit sleepy there.
In 5th gear I can get a 2 second hammering if I want to. And it's not like a fuel cut that shuts the car down completely. 5th gear, cruising at 55mph, apply throttle, car starts to shake. RPMs seem to stop climbing at the same time too.
When I adjusted the boost a little lower 14.5 psi or something, the hessitation is less pronounced but it's still there.
The cars upgrades are in my signature and are updated. I also searched the forums, but all the threads I've read through seem to indicate that half of the car has been replaced and no post to indicate the success or failure and the real culprit.
I don't want to spend huge amounts of money on replacing everything, so I'm hoping someone can tell me what to look for first.
But for now it seems that pretty much anything can be faulty.
I can also log the car, and I have few EvoScan logs done, but the car has weird experimental ECU from Mitsubishi and therefore not all parameters can be trusted, and it's hard to say if they're accurate.
I attached short EvoScan log from bogging at 5th gear below (rename .xml to .csv). The log has been done using Ceddys XML profile for EvoScan. Unfortunately, I don't have wideband so AFRs are unknown during bogging.
How can I narrow down is it a spark issue, fuel delivery issue or something else. How can I tell if it's preignition, detonation or something else? What sort of data is missing to understand the problem?
