Help with P2 Overboost
Help with P2 Overboost
I got my car back from the dealer a day or two ago, and I noticed that the turbo is overboosting then the fuel is being cut. This only happens when the turbo is spooled for a long time (IE fifth gear) so I'm pretty sure it's wastegate related and I'm thinking one of two things. Something is loose between the vacuum solenoid electrical connection or the hoses, or the guy replaced my Works boost hose for some reason (does it look different, I never noticed). If it's not a loose connection of some sort, is there an easy way to tell if I have the right boost hose?
Thanks
Thanks
Originally Posted by Compjoc
The Works boost line looks exactly like the stocker. I dought the tech at mitsu. replaced it. What did you take it into the dealer for? When did you get flashed with the Works P2?
Turns out the P2 needed a reflash. I'm guessing the motor is loosening up now (only got 16k on it) or something.. maybe it was a change in the weather. Whatever the cause, WORKS seems to have fixed the problem and things are working great once again. The MR BOV I would recommend, BTW - it holds a lot more boost than stock, and seems to be a great compliment to the P2.
Thanks WORKS!
Thanks WORKS!
Last edited by ZeeGermans; Sep 10, 2005 at 07:47 PM.
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i have that syptem but i doint trully no how to explain it , if you ease into the throttle it wont do it but if you stab it it will jump up to 23-24 psi and then drop down , but it feels like a mean type of surge . And if in 5 th gear you hold it for long it will do it . I have no flash yet but i have been thinking of the works P2 . I guess i can start with the basics and check everything , but could it be a bad wastegat or something like that . thanks again
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From: North bay
Originally Posted by ZeeGermans
Turns out the P2 needed a reflash. I'm guessing the motor is loosening up now (only got 16k on it) or something.. maybe it was a change in the weather.
Originally Posted by ex-honda
I thought that the P2 was a one time thing and don't need to be done again. Maybe I should get mine reflashed because when I punch it from 65mph and boost 20-21psi, I feel nothing.
Originally Posted by cleanevo
i have that syptem but i doint trully no how to explain it , if you ease into the throttle it wont do it but if you stab it it will jump up to 23-24 psi and then drop down , but it feels like a mean type of surge . And if in 5 th gear you hold it for long it will do it . I have no flash yet but i have been thinking of the works P2 . I guess i can start with the basics and check everything , but could it be a bad wastegat or something like that . thanks again
From http://www.norcalevo.net/forums/viewtopic.php?t=5888 :
And:
Just to be sure, I replaced the boost control solenoid last night. Doesn't seem to have made any difference.
Originally Posted by vtluu
A few weeks ago a Thunderhill I encountered some issues with "abnormal" boost pressure. Sometime during my second session I noticed that the car felt a bit anemic while accelerating; I took a few looks at my boost gauge and noticed the car was only boosting to 12 psi. I knew that could happen if the ECU detected too much knock (a bit odd since I was running about half-and-half pump and race gas at the time) so I figured, whatever, keep going and deal with it before next session.
Next lap around, much to my surprise I noticed that boost was up again. WAY UP. Going down the straight boost was holding steady at close to 24 psi all the way through redline. And that's pretty much the way it ran the rest of the day. I filled up with straight VP100 race gas, and saw boost holding at 24, sometimes close to 25 psi. The engine seemed to run perfectly fine, no audible misfiring or knocking, no stumbling at idle. The only related issue was that in the 6th session an upper IC hose joint blew and I had to limp back to the pits and repair it, but after I fixed that everything was good again.
A few observations:
- Engine setup is a WORKS turbo-back exhaust (DP + HFC + IP + ABM), WORKS P2R reflash (default 91-octane tune), JDM MR diverter valve, WORKS air filter.
- Temperature was warm but not hot, mid-70s before noon to low-80s in the afternoon.
- Boost profile was normal (peaking at 21, holding at 20 through redline) when doing freeway pulls the day before.
- I did a pull on the road leaving TH right afterwards--with a half-tank of VP100 remaining--and boost was more or less back down to normal again, peaking and holding around 21 psi.
- I've done a few pulls on the freeway since, and boost is normal.
- No check engine codes or anything the whole day (except for P0300 crusing along on the drive home; I get a P0300 code just about every other day).
If this behaviour (boosting high when running race gas) were by design I'd be thrilled, but Pete@WORKS was as surprised by it as I was. I took the car to WORKS and a cursory visual inspection didn't reveal anything abnormal. Wastegate actuator looked okay.
Next lap around, much to my surprise I noticed that boost was up again. WAY UP. Going down the straight boost was holding steady at close to 24 psi all the way through redline. And that's pretty much the way it ran the rest of the day. I filled up with straight VP100 race gas, and saw boost holding at 24, sometimes close to 25 psi. The engine seemed to run perfectly fine, no audible misfiring or knocking, no stumbling at idle. The only related issue was that in the 6th session an upper IC hose joint blew and I had to limp back to the pits and repair it, but after I fixed that everything was good again.
A few observations:
- Engine setup is a WORKS turbo-back exhaust (DP + HFC + IP + ABM), WORKS P2R reflash (default 91-octane tune), JDM MR diverter valve, WORKS air filter.
- Temperature was warm but not hot, mid-70s before noon to low-80s in the afternoon.
- Boost profile was normal (peaking at 21, holding at 20 through redline) when doing freeway pulls the day before.
- I did a pull on the road leaving TH right afterwards--with a half-tank of VP100 remaining--and boost was more or less back down to normal again, peaking and holding around 21 psi.
- I've done a few pulls on the freeway since, and boost is normal.
- No check engine codes or anything the whole day (except for P0300 crusing along on the drive home; I get a P0300 code just about every other day).
If this behaviour (boosting high when running race gas) were by design I'd be thrilled, but Pete@WORKS was as surprised by it as I was. I took the car to WORKS and a cursory visual inspection didn't reveal anything abnormal. Wastegate actuator looked okay.
Originally Posted by vtluu
Did a few 3rd-gear pulls on the San Mateo Dyno... uh I mean Bridge... today. I was able to observe boost creep up suddenly to 24 psi very close to the limiter. I.e. the boost profile I saw was that it would hold boost at about 21 psi right up until I got close to 7500 rpm, whereupon it would shoot sharply upwards to 24 psi. I'm pretty sure that at the racetrack I was getting to 24 psi at a lot lower revs, but at least this is something I can look at.
Originally Posted by ZeeGermans
Turns out the P2 needed a reflash. I'm guessing the motor is loosening up now (only got 16k on it) or something.. maybe it was a change in the weather. Whatever the cause, WORKS seems to have fixed the problem and things are working great once again. The MR BOV I would recommend, BTW - it holds a lot more boost than stock, and seems to be a great compliment to the P2.
Thanks WORKS!
Thanks WORKS!