Ariel.Club Forum

correct....Vaughn owns the cobalt ss....Brian tunes all sorts of GM cars including Vaughn's cobalt

So he is not the actual tuner then.  got it. 

yep that's him....and he's the one that referred me to the tuner guy!

I posted all about the turbo Atom on the cobalt forum a while back.  Is he "JapEatr" over there?  We are talking about fuel pumps right now and he mentioned he is working on an Atom.  I would love to ask what he thinks about my MAF problem (maxing it out at 18 PSI and 6700 RPM and I cant move it after the intercooler)

http://www.cobaltss.net/forums/showthread.php?t=124262

Have you ever talked with him...he said he talked with someone months ago who was turbocharging they're atom and adding paddle shifters...I thought it had to be you.

No I haven't talked with him, I just found this stuff searching last night.  Pretty much most of our problems they have seen before (ecu stuff, melting cats and exhausts, heat soak, blowing dipsticks out, etc).  If you can find it, there is a lot of good information out there. 

so you've been talking to Vaughn right...it's funny how you and I found the same guy through the Cobalt Forum....and he happens to live in my city! 

Limp mode follow up.  I'm hitting the p0068 code more often now with my turbo conversion.  I found that this is a common problem on the cobalt cars that up their boost.  Here is what they all do:

"go into the diagnostics in hptuners and set the enable rpm for p0068 to 8000 rpms. problem solved"

So you guys with custom tunes who still occasionally hit the limp mode this is what to do to eliminate it.  For those of you with Atom ECU's you're kind of stuck until you get a cobalt ECU and tune

[quote="nicolas"]
I have the event on video at the track...

Basically I was driving downhill on the main straight.
I did a 3rd to 4th change (probably at 6K), and shortly afterwards I lost power - I lost all power from the engine (all electronics appeared to still work.)
I was able to pull the car off into the skidpan area (relatively safe, but not totally as I was not behind a safety wall) and tried to start the car a few times - it just failed to start - the starter would kick over and over and over...
Finally I sat and waited, then tried again.
The car finally started up, and I had no problems the rest of the day.

http://www.atomguy.com/070923Session1Stall.mp4  (RIGHT CLICK and SAVE this - it will pay with Apple Quicktime.)
The stall happens at 22sec into the video.
You can hear me trying to start it at around 1min.
At 1:30, I get it started, but it's really rough and dies right away.
At 2:20 I completely fail to start it again.
At 2:35, it starts and I get to drive away.
The car worked fine for the rest of the day.
[/quote]
Thats EXACTLY what happened to me.

I have the event on video at the track...

Basically I was driving downhill on the main straight.
I did a 3rd to 4th change (probably at 6K), and shortly afterwards I lost power - I lost all power from the engine (all electronics appeared to still work.)
I was able to pull the car off into the skidpan area (relatively safe, but not totally as I was not behind a safety wall) and tried to start the car a few times - it just failed to start - the starter would kick over and over and over...
Finally I sat and waited, then tried again.
The car finally started up, and I had no problems the rest of the day.

http://www.atomguy.com/070923Session1Stall.mp4  (RIGHT CLICK and SAVE this - it will play with Apple Quicktime.)
The stall happens at 22sec into the video.
You can hear me trying to start it at around 1min.
At 1:30, I get it started, but it's really rough and dies right away.
At 2:20 I completely fail to start it again.
At 2:35, it starts and I get to drive away.
The car worked fine for the rest of the day.

[quote="Positron"]
forcesevens, I'd like to hear in more detail what preceded your shut down to compare with my logged data.
Ambient temp
session
lap ie early in session or late
turn L or R
preceding or exiting a turn
throttle change
gear
accel or decel
RPM increasing/deceasing/stable
[/quote]The only thing is the muffler just began to leak and blow out.
I was not driving when the atom gave out - it was my brother - who was really taking it easy and it went out on the second lap.
The previous run I was driving and I was pushing it harder and harder for about 10 laps on a 1.5 mile course.

My guess is yours, if unrepeatable, was a faulty ground and since the components have been completely reassembled your done until you exceed the limits that are defined in the ECM. My understanding was that Brammo could/did not have access to ECM other than dealer level access, so unless they hired a tuner, doubtful, no parameters were changed. They are very ground and voltage sensitive.

In my case, the car was doing exactly what it was suppose to do, the error is what it's being asked to do was not expected (more likely exceeded) in the designing. There are no random occurrences in mechanical things. My esteem colleague, although contradicting himself elsewhere, is correct. "when part A doesn't agree with part B it freaks out and shuts down"

forcesevens, I'd like to hear in more detail what preceded your shut down to compare with my logged data.
Ambient temp
session
lap ie early in session or late
turn L or R
preceding or exiting a turn
throttle change
gear
accel or decel
RPM increasing/deceasing/stable

why not just track down Eric at Brammo and find out what he did with my engine??

Darth is correct with grounding, but since no one seems to believe what the other is saying let's just caulk this one up to "shiate happens" and be done with it shall we..

This happened to me last time I was on the track.  It got weak and then completely died.  We feared for the
worse like a head gasket blown.  We had to shutdown the track and tow it back to the pits. 
I checked all the fluids and everything checked out.  30 minutes it just fired back up as if nothing happened.
I'm still driving it around today as if nothing happened. :p