DME cant just go bad because you put on a turbo... or a 5 bar.... then re flashed it...
seems like the TB is closing... log TB position during a run too... see if its opened under full load... I seen that in a log once.. a disconnected battery took care of it...
bottom line is if the car was OK before... then, something went astray during the install.... DMEs don't mysteriously go bad on a lift over a weekend lol

 

OK Mark,
I did some data logging runs today...

One thing I did notice... the day I picked the car up from Rennsport we did a test drive and I saw 1.3 bar of boost for a very short stint on one of our drives and the car was fine. I left the car with them and the next day they got the P1508 code but I haven't a clue at what boost pressure. They cleared the code and drove it some more and it was fine.

I picked it up after that and drove it a day, only boosting it in 4th thru 6th and no problems...

The next day, driving to work in the morning (cool out) I got on it in 2nd and 3rd and bam! P1508... Not really sure what the boost pressure was at the time but I imagine it was north of 1 by the feel of the torque.

So today, I data log it, certain that it's going to replicate the code as soon as I WOT in 3rd gear from 2200 RPM...and NOPE....

Max boost was around 1 and it never misbehaved. I did a few runs and IF it went over 1 bar of boost I didn't see it. But I thought it strange that one day it was boosting to 1.3 and a few days later it's only boosting to 1.0

Im running at least 93 octane right now, probably closer to 98.

Will Attempt to attach Data Logs in next post

 

somethings is up...
You need a log... then have them do a basic look over... check the turbos, Wgs.... and a pressure test.... thats the start... make sure the 5 bar has the vacuum line hooked up...
I bet you have a Boost leak somewhere around your Dvs...
mark

ps. Email me the excel file... info@911tuning.com

 

Data Logs Attached (.pdf)

 

I just emailed the Excel files to you also...

Thanks a ton!

 

First off, Mark from 911Tuning.com has been invaluable in solving this problem. That guy knows his stuff when it comes to these Turbo's. At no point was he ever in doubt, he pretty much knew right from the get go what the problem had to be and he was right.

So of you modify your car with turbos, exhaust, etc and right afterwards you get a P1508 Code saying something about Torque Comparison. It doesn't mean that your DME is fried, nor does it mean that your MAF is bad or fried.

It means that a cyclinder, or bank of cylinders is or is not getting the same amount of boost and its causing a torque difference in the motor...

IE.... Boost LEAK! OR... Waste Gate Actuators aren't synchronized.

So after making sure the WG's were set, I boost leak tested and found a MASSIVE boost leak in the most difficult place in the world to get to... the forward most cyclinder on the PSGR side, air intake tract hose wasn't sealed to the case properly and was blowing just as much air out as was going in...

Also found a leak in the new diverter valve were it connects to the F Pipe...but that was mild.

Now it appears everything is fine...

So if you want to source some tuning parts from a reputable guy that knows and has tested everything he is selling and can tell you the ins and outs of all the kits that he sells...talk to Mark at 911Tuning.com. I'm still mystified by the service he provided. He was helping me over the holiday weekend too and never once complained.

 

Glad you solved it,Markski is the man.

 

Thanks for the kind words...
mark