I just wanted to chime in and say a quick thank you to all of you who have supported Cobb! I'm happy we have been able to make such a positive impact in this market. We will always be there for you guys regardless of if you purchased the unit direct from Cobb, one of our many authorized vendors, or second hand off of another forum member.

Please contact us if you have any questions!

Thanks!

-Jon

 

Jon,

Do you guys offer a Stage1 OTS map for 91 octane base turbo?

It thought it was up on your website a few days but had no dyno map which I thought was odd. Now it is coming up with file not found, one example

http://www.cobbtuning.com/maps/2001-...0e-stage-1-map

If so is there any dyno maps for it?

TIA,
Jeff

 

Hi Jeff,

I too had trouble accessing it right after I read your post but shortly after it seemed to be work fine. Let me know if you are still having trouble.

As for the stage1 dyno plot goes, We will work on getting one up for guys in the future. It is pretty rare these days to find an unmodified 996TT.

Here are our current map notes for the 996TT for those interested:

https://cobbtuning.atlassian.net/wik...6+TT+Map+Notes


Thanks again!

-Jon

 

thanks, yes that is what I saw previously. Stage1 has no dyno and the boost targets were the same as Stage2 so was not sure.

So how did you create the stage1 OTS since it sounds like you did not tune a stock 996 on a dyno. Just tweaked the tables to what you think you wanted and then maybe modified based on some customers running it and getting data? Sorry if misunderstanding or rookie questions.

 

No problem at all, happy to help!

We dyno tune and test all of our OTS maps. I will make it a priority to get the dyno plot uploaded to our map notes and request the guys add it to the website in the near future!

The stock turbos have a tough time running more than ~15psi +/-1.5psi peak boost pressure, depending on the car. We found through testing that stage 1 and stage 2 were able to operate well at the same peak boost pressure, however with stage 2 we are generally able to hold more boost at a higher RPM as well as running slightly more ignition timing.

Ideally we'd love to push the stock turbochargers further than 15psi on a stage2 calibration but that isn't really possible with out upgraded turbochargers on these cars.

Upgrading the actuators may net you a 1-3psi increase with the stock turbos. However, due to the variances in actuators we don't offer an OTS map to accommodate those and recommend a protune if you choose to run them.


Thanks!

-Jon

 

Sounds good, thanks for the response

 

Cheers to Cobb, Mitch and Jon have spearheaded a strong team and gotten so much done in the last few years! Then the support that follows for both dealers and clients is what really creates a full product. The AP is an awesome tool and gives us all a lot to work with so that in the end the customer gets the most out of it! Proud to be a part of it all!

 

So it sounds like there is not a OTS tune that is designed for the X50?. It should be able to handle more than 1 bar no problem.

 

Anyone else having issues with the COBB tune killing the engine fan running after engine shutoff?

My AWE tune the fan would stay on after engine shutoff like normal. After the COBB tune my fan runs normally with the engine on but will never run after engine shutoff.

Is there a workaround or fix to re-enable the OEM fan operation?

*should note we confirmed the fan works independently correctly, and the temp gauge that controls it in the engine bay also is reading the correct voltage* Switch only occurred with the COBB tune replacing the AWE tune.

 

Nope, my fan runs fine.

 

Ok, so started with making some testers to attach in place of the turbo outlets. From there had a very slight leak from reattaching the hose to the IC inlet, which went away when I reseated it. From there all I could hear was a faint leak to the left of the throttle-body.


Then made a tester to replace the throttle-body and narrowed that leak down to a plastic vacuum line assembly that has multiple connections including one that has to be capped off for testing that goes back to the ypipe. It's the connection just to left of that hose to the y-pipe and is a very slight leak from what appears to be where that fitting is assembled to the housing. Needed to spray a little windex to verify where it was leaking. I've attempted to coat that seam with silicone, hoping that will temporarily seal the leak so I can try to retest and confirm that's indeed the only leak. Haven't been able to find the name or part number of that assembly yet to try and track down a replacement.


I was hoping to find that the FPR line was either popped off or broken but it appears fine and no leaks. Any suggestions next? I was going to pull the FPR vacuum line off at the manifold and test if it holds vacuum and pressure. Maybe just replace the regulator and if that isn't the issue chalk up it's replacement to preventative maintenance as the original is 15+ years old anyway.


Another thought was to put everything back together and revert back from the stage1 91 octane to stage0 just to rule that out. I suspect though that the OTS map wouldn't be anywhere near that lean.

 

Looks like this is the part that has a very slight leak at the housing called a VENTURI TUBE.


996-110-652-70

 

I noted that you said the dash gauge and the Cobb are showing different boost.

I have seen a similar problem with mine, which I confirmed with a durametric. For me the Cobb logs roughly .2 or .4 bar less at full boost. Also confirmed with 2 aftermarket boost gauges I have on the car.

Have you tried a durametric and logged with that??

 

I don't have a durametric at all. It's a stock car that gets used a daily driver and when I saw that Cobb released OTS tunes for a stock car with the ability to datalog I decided to give the accessport a try.


Now that you mention being roughly .2 or .4 bar less, that would be the only other thought I had why it could be lean if fpr and everything else is fine. Is there a chance I'm getting the fueling based on the lower boost when its actually boosting higher, therefore running way lean? That would be very scary.

 

No. Boost control and fuel control are mostly independent.

I didnt read back through your entire thread, but what are you lamba and fuel trims like?