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+--- Thread: Overboost Issues (/showthread.php?tid=10088)
Overboost Issues - Ken - 11-27-2012
Hi guys, hoping one of you could lend a hand. I re-tuned my car to a stage one Cobb tune last week after weening it back onto premium gas. However, past two days when I go WOT the car kind of thumped and once even threw a CEL. I plugged in the Cobb and the Code I got was for wastegate malfunction. From what gather it is due to over boosting. Not sure where to go from here, if someone could possibly take a look at some of the datalogs i pulled and shed some light i would greatly appreciate it (could send them to you). From what i see the knocksum is fine right up until it overboosts, at which point it goes to 6 and 9. Not really sure if this could be from the cold, haven't had these issues until now.
Just as a precaution i set it back to stock and i will mind the boost pressure to see if it still shoots up high, as that would mind it could be a leak? I think?
Any help would be appreciated, thanks in advance guys!
Re: Overboost Issues - kcook - 11-27-2012
Who tuned your car? You or an actual tuner
Or
Do you mean you reflashed your ecu using an off the shelf map from Cobb?
What other mods do you have?
Overboost Issues - JPolen01 - 11-28-2012
He just did a reflash.
Re: Overboost Issues - CaptainHenreh - 11-28-2012
Overboost is not uncommon in cold weather. Cold air is denser, so the same "wastegate open point", if you will, will result in higher than expected pressure on the intake side.
Flash your low wastegate map. It happened to me on the STI the other day. NBD, as long as it doesn't happen all the time.
Re: Overboost Issues - D_Eclipse9916 - 11-28-2012
What software? I can look at the tune for you if you like.
That said, its cold out, most likely you just overboosted as per typical.
Flash out the code and run lower boost pressure. That or get a proper fix by either porting out the wastegate or getitng a bigger wastegate to control the boost pressure.
Ah such the life of turbos...
Overboost Issues - JPolen01 - 11-28-2012
D_Eclipse9916 Wrote:What software? I can look at the tune for you if you like.Is reading comprehension a lost art these days?
Re: Overboost Issues - Jake - 11-28-2012
JPolen01 Wrote:D_Eclipse9916 Wrote:What software? I can look at the tune for you if you like.Is reading comprehension a lost art these days?
Damn, clean the sand out of your 'gina, Jon... it's a Cobb tune but nowhere does Ken say what software he is using for data logging.
Re: Overboost Issues - CaptainHenreh - 11-28-2012
Jake Wrote:JPolen01 Wrote:D_Eclipse9916 Wrote:What software? I can look at the tune for you if you like.Is reading comprehension a lost art these days?
Damn, clean the sand out of your 'gina, Jon... it's a Cobb tune but nowhere does Ken say what software he is using for data logging.
Eh, he's using the Cobb AP for data logging I am sure. It'll be a spreadsheet. Switch to your Low Wastegate Map or go pay a tuner for a proper road tune.
Are you using the 91 or 93oct map?
Re: Overboost Issues - CaptainHenreh - 11-28-2012
Also, it doesn't look like there is a "blessed" 2011 Evo GSR map out yet...are you using the beta OTS (off the shelf) map?
If you would like help, please post:
The Map name you're using, (if you're using a Cobb Off the Shelf map) formatted like this:
"Stage1 93 v201"
If another map, where you got it from.
Your Datalog (You can post it to google docs and share it with us), preferably from one where you did get an overboost situation.
The Octane Level of the gasoline you've put in the car.
Your relevant car information: Modifications (if any) Mileage, etc, etc.
Re: Overboost Issues - D_Eclipse9916 - 11-28-2012
JPolen01 Wrote:D_Eclipse9916 Wrote:What software? I can look at the tune for you if you like.Is reading comprehension a lost art these days?
Just because he is running a Cobb tune does not mean the software they use to data-log is based off of that. :roll:
Google docs the excel spreadsheet (is that how they display info?). I would like to see what Cobb shows in data if you have injector duty cycle, knock, rpm, timing, boost, and A/F we can see what is going on.
Overboost Issues - JPolen01 - 11-28-2012
Dr Rex is in tha house
Re: Overboost Issues - CaptainHenreh - 11-28-2012
DJ knows more about it than I do, but we're just fumbling in the dark without Ken providing us with the req'd info.
Re: Overboost Issues - D_Eclipse9916 - 11-28-2012
CaptainHenreh Wrote:DJ knows more about it than I do, but we're just fumbling in the dark without Ken providing us with the req'd info.
I had a POS dsm for too long, I HAD to :lol:
Re: Overboost Issues - Ken - 11-28-2012
kcook Wrote:Who tuned your car? You or an actual tuner
Or
Do you mean you reflashed your ecu using an off the shelf map from Cobb?
What other mods do you have?
Sorry, I wasn't clear, i used a "stage 1 93 Octane + intake" off the shelf map from Cobb. I have just the Cobb, and the Short ram intake I did as per my project thread.
CaptainHenreh Wrote:Overboost is not uncommon in cold weather. Cold air is denser, so the same "wastegate open point", if you will, will result in higher than expected pressure on the intake side.[
Flash your low wastegate map. It happened to me on the STI the other day. NBD, as long as it doesn't happen all the time.
I guess this could be the issue, after switching to the Stock 0 map today, i hit 25 PSI today on the way to work. Which, by the way, is the stage 0 actually stock? I heard that it's just Cobb's replication of stock, any truth to that?
Unfortunately, 2011 Evo X's are still in BETA, which could also be a very obvious problem; so there is no low wastegate map just yet.
D_Eclipse9916 Wrote:What software? I can look at the tune for you if you like.
That said, its cold out, most likely you just overboosted as per typical.
Flash out the code and run lower boost pressure. That or get a proper fix by either porting out the wastegate or getitng a bigger wastegate to control the boost pressure.
Ah such the life of turbos...
All i have are the logs that i ran, not sure if that would shed any light on what's going on...
I guess I'm just more worried that the car is boosting to almost 25 now on the "stock map", but you guys are saying this is relatively normal for colder weather?
Re: Overboost Issues - Ken - 11-28-2012
CaptainHenreh Wrote:Also, it doesn't look like there is a "blessed" 2011 Evo GSR map out yet...are you using the beta OTS (off the shelf) map?
If you would like help, please post:
The Map name you're using, (if you're using a Cobb Off the Shelf map) formatted like this:
"Stage1 93 v201"
If another map, where you got it from.
Your Datalog (You can post it to google docs and share it with us), preferably from one where you did get an overboost situation.
The Octane Level of the gasoline you've put in the car.
Your relevant car information: Modifications (if any) Mileage, etc, etc.
Gladly, haven't used google docs in forever, how to make it viewable to you fellows?
Re: Overboost Issues - CaptainHenreh - 11-28-2012
Yeah, ignore the "Stage 0"...unmarry your cobb, then run it...see if you're still getting this overboost issue. Also, the Stage 1+Intake is tuned for *Cobb*'s intake. If the flow rate is different (like, for example, higher) from your home-grown intake you might be causing the issue with that.
Unmarry the cobb, let your ECU learn for a while, and use the to datalog a session, see what your peak boost pressure is. If you're exceeding ~23psi, your intake is probably to blame.
on my STI with the Standard Wastegate 93OCT map I noticed some exceeding of target boost pressure, so I switched to the 91OCT map and have not really had a problem. I doubt you're taking much of a hit switching to the 91OCT map, but I'd figure out why you're exceeding your boost target first.
Re: Overboost Issues - D_Eclipse9916 - 11-28-2012
Datalog,
Can you get us the dutycycle of your "built-in electronic boost controller?" It most likely is overshooting due to the density of the cold air. That is if, the wastegate can usually control the issue.
Re: Overboost Issues - Ken - 11-28-2012
CaptainHenreh Wrote:Yeah, ignore the "Stage 0"...unmarry your cobb, then run it...see if you're still getting this overboost issue. Also, the Stage 1+Intake is tuned for *Cobb*'s intake. If the flow rate is different (like, for example, higher) from your home-grown intake you might be causing the issue with that.
Unmarry the cobb, let your ECU learn for a while, and use the to datalog a session, see what your peak boost pressure is. If you're exceeding ~23psi, your intake is probably to blame.
on my STI with the Standard Wastegate 93OCT map I noticed some exceeding of target boost pressure, so I switched to the 91OCT map and have not really had a problem. I doubt you're taking much of a hit switching to the 91OCT map, but I'd figure out why you're exceeding your boost target first.
Can you still datalog without being married to the ECU?
Re: Overboost Issues - CaptainHenreh - 11-28-2012
Ken Wrote:Can you still datalog without being married to the ECU?
I thought so? Regardless, it would be a good data point to see if your problems persist with the stage1 tune removed.
Re: Overboost Issues - D_Eclipse9916 - 11-28-2012
Ah,
Read up on what you have, basically a glorified USB data stick that has an OBD2 prong.
Datalog, send it off to Cobb. Thats really your only option unless you change to a tune that Cobb has perfected (that your vehicle reflects mod-wise)