[B_davis]

....

[deltalima0]

I just recently installed Cobb on my 07 3 days ago an love it. No problems at all. I think the code you are seeing is one i saw when I first went Dinan stg1 which if i remember correctly was a low boost pressure i threw another one but they were both the same low boost pressure codes. BMW re flashed their stock tune and couldn't duplicate the codes BMW's turbos are kinda crap but Dinan stepped up sent me their turbos same basically just better built issue resolved after that.

[possible335i2008]

I thought 30ff were caused by missing boost target, usually under boost can be caused by either a boost leak or a tuning issue? That sucks, it used to happen with the original jb3 v1-2, got worse with the temperatures increasing...hopefully it is resolved I would log and send it in to Cobb.

[marv85]

I've been running Cobb for a while. NO issues what so ever. Max boost is 15.5psi for a short duration then it tampers down to 13.
As stated above, 30FF is caused by not being able to build boost to the requested target. Did you install anything recently? May be a boost leak

[Sniz]

Originally Posted by B_davis

I am constantly seeing 16-17psi under load, and I keep throwing Code P30FF. Anyone know if these two are related?On my last car, a 3000gt Vr-4, we were always under the impression that pump gas started to detonate at 15+ psi, regardless of A/F.

no

[themyst]

Originally Posted by B_davis

I am constantly seeing 16-17psi under load, and I keep throwing Code P30FF. Anyone know if these two are related? On my last car, a 3000gt Vr-4, we were always under the impression that pump gas started to detonate at 15+ psi, regardless of A/F.

I am suspecting boost leak or an issue with boost targeting within the Cobb tune. The ECU targets a load index, not boost specifically. This is to ensure consistent power regardless of conditions. If the Cobb Stage 1 is targeting a load index of 160, which would be 13 psi at sea level at 60 degree ambient (just a rough example); if your car is requiring 16-17psi sustained to reach the targeted load index / AFR, there is something else going on.

I'd contact Cobb about this issue, as it's not the first time I've heard about it either.

[B_davis]

At first I thought it was a major boost leak too, But I checked all my intercooler piping and it looks good. I can get rid of the problem after a few code clears and start and stops. The car will pull hard again for a few drives, then the problem happens again.

The weird part about is my WGDC never exceeds 70, wouldn't it go to 100 if I had a boost leak, as it is trying obtain the target load.

DI might be better than Port injection, but I certain 16-17 psi is pushing the limit on pump gas. It's probably already knocking as it is, I've felt the car fall flat on its face a couple times.

[marv85]

Originally Posted by B_davis

At first I thought it was a major boost leak too, But I checked all my intercooler piping and it looks good. I can get rid of the problem after a few code clears and start and stops. The car will pull hard again for a few drives, then the problem happens again.

The weird part about is my WGDC never exceeds 70, wouldn't it go to 100 if I had a boost leak, as it is trying obtain the target load.

DI might be better than Port injection, but I certain 16-17 psi is pushing the limit on pump gas. It's probably already knocking as it is, I've felt the car fall flat on its face a couple times.

My WGDC never goes beyond 52% there is something fishy
Why don't you post a datalog of a third gear run

[caradd]

Originally Posted by marv85

My WGDC never goes beyond 52% there is something fishy
Why don't you post a datalog of a third gear run

So how does the WGDC work the higher the number the more boost the DME is trying to achieve?

[secretsquirrel]

Originally Posted by B_davis

DI might be better than Port injection, but I certain 16-17 psi is pushing the limit on pump gas. It's probably already knocking as it is, I've felt the car fall flat on its face a couple times.

I saw you talking about PSI and the limits with your 3000GT above. You do realize that the PSI says nothing about an engine resistance to detonation, right? AFR is far more important. Different turbos (on different engines) can run far different PSIs on pump gas. For instance, Honda B16's can run 20-21psi on pump.

[vasillalov]

Originally Posted by B_davis

On my last car, a 3000gt Vr-4, we were always under the impression that pump gas started to detonate at 15+ psi, regardless of A/F.

This is wrong on soooo many levels...

Go see the VW/AUDI gearheads running 20+ psi on stock internals all day long.

[B_davis]

I can feel when timing is being pulled, what do attribute this to? other than knock count?

[Jeff@TopGearSolutions]

Originally Posted by B_davis

I am constantly seeing 16-17psi under load, and I keep throwing Code P30FF. Anyone know if these two are related? On my last car, a 3000gt Vr-4, we were always under the impression that pump gas started to detonate at 15+ psi, regardless of A/F.

Every car is different when it comes to where it detonates.

Stock Evo runs 20+ PSI.


Throw up a log.

[MicaCeli]

Originally Posted by vasillalov

This is wrong on soooo many levels...

Go see the VW/AUDI gearheads running 20+ psi on stock internals all day long.

Evo X runs 19.1psi STOCK.

[COBB Tuning]

Originally Posted by B_davis

DI might be better than Port injection, but I certain 16-17 psi is pushing the limit on pump gas. It's probably already knocking as it is, I've felt the car fall flat on its face a couple times.

I certainly appreciate your concerns and thank you for your feedback. I apologize for the issues you're having as well.

As related to your knock concerns -- the detonation threshold for each engine is based on many many many variables. Boost level only plays a small part in the equation. Compression ratio, cylinder head design, spark plug choice, injection style, incoming air charge temps, and many other factors play a part in determining the detonation threshold. As mentioned, many engines run boost levels far in excess of 15-16 psi on pump gas, even from the factory.

The code does seem odd and I also suspect there many be a boost leak or other issue at hand. Do you have the ability to pressure test or smoke test the intake tract on your car?

Best regards-
Lance

[flyers1470]

I used to have a 3000GT VR4 too (loved that car) and yes in that community anything above 15psi was considered . As the other posters have mentioned, there are many factors that go into the detonation equation, but I still cringe a little out of habit every time I see something over 15psi.

[CasperSYTFU]

Originally Posted by B_davis

I am constantly seeing 16-17psi under load, and I keep throwing Code P30FF. Anyone know if these two are related? On my last car, a 3000gt Vr-4, we were always under the impression that pump gas started to detonate at 15+ psi, regardless of A/F.

lol i ran 26psi on my evo 9 stock turbo stock internals. no issues. huge generalization bro

check for a boost leak for sure

[mundo74]

Does cobb plan a less aggressive lower boost (14 psi max) map. What boost levels you guys see with the 91 octane map

I use to love the jb3 map 3 as it was really nice around town and boost never got above 13 psi. Sold my jb3 to get Cobb but may wait until a less aggressive map is offered

[Graystone]

Boost leak fmic, especially if youve put in new fmic u can see the oil on the pipe of fmic from blow off under plastic guard

[nwn54]

I have the same code. Smooth install, but not running strong. And throwing this code. I haven't installed a FMIC, but I did just replace my diverter valves and put on an aFe intake...

[nwn54]

It was a problem with the diverter valves. The oem connector had come free. Pulls hard as can be. No surge at all. Now I have a P2D25...

[I3ossman]

I ran 26psi on 93/c16 mix in my AWD DSM and 22psi daily.. stock motor. Sooo much more goes into the equation than psi