GM Performance Parts Turbo Upgrade Kit
Senior Member
Joined: 07-16-2011
Posts: 267
From: Georgia
There is no 'learn down mode', per se. It is all torque based. The ECU has torque targets that it will attempt to meet. If a part is added and the fuel added for stoic causes it to exceed the torque target, it will dial back its calibration to meet the target. If the car is running below its target torque add-ons could increase the torque until the target is met. The GM upgrade has a higher torque target than stock. Two possibilities exist. One, the dealer flashed the car wrong. Or two, the car needs to be driven for a bit to fully realize the new GM calibration. All the adjustments the car makes to meet its targets are gradual.
Senior Member
Joined: 08-19-2007
Posts: 829
From: So.Cal.
The two hour flat rate time is a warranty rate only. The dealer can charge a retail customer what they want. GM CANNOT dictate to a dealer what they charge YOU, that is called PRICE FIXING and it's against federal law. They can only control what the dealer charges THEM.
Senior Member
Joined: 02-19-2012
Posts: 1,015
From: Northern California
Breadfan thanks for that explanation
you wrote
"the car needs to be driven for a bit to fully realize the new GM calibration. All the adjustments the car makes to meet its targets are gradual."
does that mean it takes a couple days before your really see the difference?
you wrote
"the car needs to be driven for a bit to fully realize the new GM calibration. All the adjustments the car makes to meet its targets are gradual."
does that mean it takes a couple days before your really see the difference?
Senior Member
Joined: 10-19-2011
Posts: 1,553
From: N.Y.
Well I figured I would post this question on here to maybe get a quicker answer
I had the GMTU installed the car makes awesome power 22 plus pounds of boost.
Goes grate from a 10 MPH roll spinning also.
But if I try to take off from a light power brakeing it and then ease into it and try and get some traction when I finally put it to the floor boost goes to 22 for a second or two then drops to zero then right back up.
Crate engine depot said could be wiring pinching but it looks like the tech did a great job .
Ced also said could be a leaking Turbo?
Today CED tom said it could be that the wires are too tightly installed and that what could be happening is the motor is rocking pulling the tmap out of the pipe creating a leak Any ideas?
Also a couple months back I had the vacuum assit pump added worked great.
Now the brakes are right back to where they where
I am assuming they did the wrong reflash.
In the instructions It clearly shows a different reflash for the 09hhr ss auto with vacuum pump.which I outlined for the tech.
According to Tom At CED he said he never heard of a different reflash for the vacuum assist.He said the tech simply calls gm and based on the vin they give him the reflash?????
I am guessing they put the wrong reflash in.Tom at CED is checking with the engineers to see if they have ever heard of this.I would think they would have encountered this with over 400 installs under there belt?
Come to think of it as far as the boost going down then back up again I believe I have encountered that before the gmtu so maybe it is a traction control thing kicking in when it should not or even a turbo issue.??
Any advice would be great
at this point I have to wait for the dealer to look at it Friday at the earliest.
I had the GMTU installed the car makes awesome power 22 plus pounds of boost.
Goes grate from a 10 MPH roll spinning also.
But if I try to take off from a light power brakeing it and then ease into it and try and get some traction when I finally put it to the floor boost goes to 22 for a second or two then drops to zero then right back up.
Crate engine depot said could be wiring pinching but it looks like the tech did a great job .
Ced also said could be a leaking Turbo?
Today CED tom said it could be that the wires are too tightly installed and that what could be happening is the motor is rocking pulling the tmap out of the pipe creating a leak Any ideas?
Also a couple months back I had the vacuum assit pump added worked great.
Now the brakes are right back to where they where
I am assuming they did the wrong reflash.
In the instructions It clearly shows a different reflash for the 09hhr ss auto with vacuum pump.which I outlined for the tech.
According to Tom At CED he said he never heard of a different reflash for the vacuum assist.He said the tech simply calls gm and based on the vin they give him the reflash?????
I am guessing they put the wrong reflash in.Tom at CED is checking with the engineers to see if they have ever heard of this.I would think they would have encountered this with over 400 installs under there belt?
Come to think of it as far as the boost going down then back up again I believe I have encountered that before the gmtu so maybe it is a traction control thing kicking in when it should not or even a turbo issue.??
Any advice would be great
at this point I have to wait for the dealer to look at it Friday at the earliest.
Member
Joined: 07-06-2011
Posts: 95
From: Bellbrook OH
My '09 SS automatic produced an easy-to-obtain 23-24 pounds of boost BEFORE auxillary brake vacuum pump installed and ~19 pounds max boost after vacuum pump installed. I'm not throwing any codes, and I confirmed with my scanner that the ECM has the correct calibration P/N flashed per the TSB. Any thoughts on what may be the problem before I make an appointment to take the car back to the dealer for them to troubleshoot?
Member
Joined: 07-06-2011
Posts: 95
From: Bellbrook OH
Could be another problem not related to the pump. Unless there is an update to the TSB, this is the code from the aux pump TSB that's currently in my ECM and flashed during the pump mod:
2009 Chevrolet HHR SS, automatic transmission with electronic vacuum pump for brake assist 2.0 = Calibration P/N 12633832
2009 Chevrolet HHR SS, automatic transmission with electronic vacuum pump for brake assist 2.0 = Calibration P/N 12633832
Senior Member
Joined: 10-19-2011
Posts: 1,553
From: N.Y.
Help with my sanity with the Gm Turbo Upgrade
well really starting to be dissapointed
in the GMTU turbo Upgrade now. $700.00 and a couple weeks out and still having issues.
i have to admit my dealer is awesome in trying to help out with those so that at least makes me feel better.
I thought I had all the bugs figured out with it (besides the vaccum brake assist pump not working).It appears that the bracket the dealer made is working
and not allowing the tmap sensor to get hit by the ac pump and also now that the tmap sensor nub was ground off by the dealer and reinstalled correctley it is seated properly.
IT has been boosting consistentley 20 plus pounds.Of course it even did that when the oring was showing with the tmap was popped up a little
Usually though when you put it to the floor in D at say 65 it would downshift and only pull 15 psi.Then try it again and it would be at 22psi?
I do realize that the boost changes depending on the air density but
Today I figured I would try it again since I have not in a while just been cruising and saving gas.
Getting on the highway up hill at about 40 mph i eased into the throttle and the boost shoots right up to 15 psi at half throttle without downshifting as it has always done since the gmtu was installed
I put it to the floor at about 60 65 in D with traction control off and in competitive mode it only boosted to 15 psi and felt a little faster than stock.
tried it a few seconds later and it went right to 22 and pulled like I would expect 290 hp to pull.
tried again and right back to 15
tried it from a 10 mph roll and it always shoots up to and over 20 and pulls hard
not today it was only hitting like 12
is it possible it needs to be reflashed or maybe something else any ideas before I loose my sanity.
I just wish I was out of warranty and I would go HP tuners
in the GMTU turbo Upgrade now. $700.00 and a couple weeks out and still having issues.i have to admit my dealer is awesome in trying to help out with those so that at least makes me feel better.
I thought I had all the bugs figured out with it (besides the vaccum brake assist pump not working).It appears that the bracket the dealer made is working
and not allowing the tmap sensor to get hit by the ac pump and also now that the tmap sensor nub was ground off by the dealer and reinstalled correctley it is seated properly.IT has been boosting consistentley 20 plus pounds.Of course it even did that when the oring was showing with the tmap was popped up a little
Usually though when you put it to the floor in D at say 65 it would downshift and only pull 15 psi.Then try it again and it would be at 22psi?
I do realize that the boost changes depending on the air density but
Today I figured I would try it again since I have not in a while just been cruising and saving gas.
Getting on the highway up hill at about 40 mph i eased into the throttle and the boost shoots right up to 15 psi at half throttle without downshifting as it has always done since the gmtu was installed
I put it to the floor at about 60 65 in D with traction control off and in competitive mode it only boosted to 15 psi and felt a little faster than stock.
tried it a few seconds later and it went right to 22 and pulled like I would expect 290 hp to pull.
tried again and right back to 15
tried it from a 10 mph roll and it always shoots up to and over 20 and pulls hard
not today it was only hitting like 12
is it possible it needs to be reflashed or maybe something else any ideas before I loose my sanity.
I just wish I was out of warranty and I would go HP tuners