[SteelTorque]

So I had my UR catless DP's installed yesterday and they are absolutely insane. Turbo sound is simply nasty and exhaust note is very mean.

Only only problem tho.

I get a limp mode ("Engine malfunction power reduced") everytime, about 15 minutes after starting the engine and it NEVER happes under boost, always just crusing or even at zero throttle.

NOTE: I am not losing any power and the car runs perfectly normal. So it's kinda of a "fake" limp mode. Car still runs great!

I already also have the Service Engine Soon light, which I don't care about.

This happens in STOCK MODE and with PROcede enabled. Same thing. No difference.

Any thoughts?

[tek818]

order the O2 simms from BMS at http://www.burgertuning.com/products.html. That should fix your CEL. I believe Vishnu will have a solution out shortly as well, and will simply include adding a wire to the PROcede harness, and changing the map.

[335iheLLraiseR]

can someone please explain what exactly those O2 sims are telling the engine that is going on?

i got a feeling someone is going to point me over to the other site.

[SteelTorque]

Originally Posted by AB Tek 818

order the O2 simms from BMS at http://www.burgertuning.com/products.html. That should fix your CEL. I believe Vishnu will have a solution out shortly as well, and will simply include adding a wire to the PROcede harness, and changing the map.

I know that would fix the CEL.....but what about the Limp Mode?

I'm trying to figure out if they are related.

[SteelTorque]

[down4it]

Originally Posted by SteelTorque

yeah I think shiv said they are related cause his car was getting limps when he got his dp's... You can wait for the new map and wire to fix it but what happens when you need to go in for service and pull out the procede?

[SteelTorque]

Originally Posted by down4it

yeah I think shiv said they are related cause his car was getting limps when he got his dp's... You can wait for the new map and wire to fix it but what happens when you need to go in for service and pull out the procede?

Yeah, I was thinking about the O2 sim from Terry.

[C-Level]

Originally Posted by SteelTorque

I know that would fix the CEL.....but what about the Limp Mode?

I'm trying to figure out if they are related.

They are definitly related. The car is Limiting itself because it's reading that the vehicle is running very rich - that and it notices that you are running faster than an M series. Once you get the simms you shouldn't have an issue. Just curious, do you have an 08 or an 07? I just recently got the Riss Racing downpipes and they were telling me that the 08s were the ones having CEL issues.

[SteelTorque]

Originally Posted by C-Level

They are definitly related. The car is Limiting itself because it's reading that the vehicle is running very rich - that and it notices that you are running faster than an M series. Once you get the simms you shouldn't have an issue. Just curious, do you have an 08 or an 07? I just recently got the Riss Racing downpipes and they were telling me that the 08s were the ones having CEL issues.

I have an 01/07 production.

The car is running perfect tho, even with the fake "limp mode".

[Sneeze]

Originally Posted by C-Level

They are definitly related. The car is Limiting itself because it's reading that the vehicle is running very rich - that and it notices that you are running faster than an M series. Once you get the simms you shouldn't have an issue. Just curious, do you have an 08 or an 07? I just recently got the Riss Racing downpipes and they were telling me that the 08s were the ones having CEL issues.

same problem here guys just installed the RR dp yesterday and after 70+ miles of fun driving check enige light appears and im losing power. Mr T. sad cel is normal with downpipes. his 02 sims should fix this problem.

i have an 06 built date.

[midlife]

Originally Posted by thr33fivei

same problem here guys just installed the RR dp yesterday and after 70+ miles of fun driving check enige light appears and im losing power. Mr T. sad cel is normal with downpipes. his 02 sims should fix this problem.

i have an 06 built date.

note that an earlier build date will not keep u from forever getting cels with catless dps.

once your bmw ecu program is updated with the latest one, you will most probably get cels with catless dps.

[BoostedBMW]

We need a mechanical o2 fix so we can leave catless downpipes in when going in for service.

[Mr. 5]

I went to the catless DPs.
I ordered the O2 Simms from Terry and they work terrific.

Originally Posted by 335iheLLraiseR

can someone please explain what exactly those O2 sims are telling the engine that is going on?

i got a feeling someone is going to point me over to the other site.

There should be a certain delta with the pressure between the first sensor (before the cat) and the second sensor (after the cat).
The o2 Simms take the first sensor readings and the second sensor readings and tricks the ecu by adding "resistance" therefore tricking the ecu into thinking that there is a cat in place.

There are actually multiple o2 simmulators. There isn't a "one solution" 02 simm because it depends on what else you are running...like is the car stock, or do you have an IC, etc.
The first one that I got from Terry didn't work because I needed a stronger resistance since I was "free flowing" so well.
The second one provided is working perfectly.

[Sneeze]

midlife,

i also notice that my exhaust is a lot louder after check engine light... is that normal?