Help With Emissions Monitors

[HanSooloo]

I live in Virginia and had my factory HP DME converted by Kassel to run the CSL tune. Over time, I worked with them change different parameters in an attempt to gain emissions readiness but we could never get there (could never get proper communication with the testing equipment). Virginia is modeled on California emissions but doesn’t require a smog or visual inspection. You all probably could’ve anticipated this outcome.

Not wanting to change out hardware, I purchased a used DME (HP or non-HP, didn’t matter). All I did was plug in the donor DME and then remotely, PCS Tuning reflashed the DME for my VIN and to run AlphaN while setting the emissions monitors to ready state. I had to do the approx 100 mile drive cycle (not wanting to do the ridiculous specific procedure) to gain all monitors ready (such as the cats and one other that I don’t recall).

Took the vehicle in, it connected, passed and I drove home and swapped the CSL DME back in. Not the cheapest but reasonable at $500 used DME + 1 hour of PCS time (probably $120). By the way, Paul’s AlphaN tune out of the box for my specific setup was super impressive. He tuned my CSL DME so it was a bit more optimized than the AlphaN which had no tuning. Including OP’s issue, I would encourage anyone to reach out to PCS Tuning.

Great info! Trying to see if my planned setup would work as you describe it.

Thinking about a Karbonius intake with functional flap, MAP sensor, CSL air rail, SuperSprint cat-less header, catted Section 2, O2 sensor relocation to Section 2. This would be complemented with a CSL tune. My M3 is an 11/03 production 04 model year car, so hoping it already has the HP DME.

Specific question is whether any one of the components above would have the risk of emissions failure using the donor DME method.

[heinzboehmer]

Flap won't work when running an alpha n tune on the stock DME with non-CSL software. But besides that, you should be fine.

[HanSooloo]

Flap won't work when running an alpha n tune on the stock DME with non-CSL software. But besides that, you should be fine.

Would the flap stay open or closed in that scenario?


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[heinzboehmer]

Not sure, but I think it just wouldn't move. There's a hardware component missing from non-CSL DMEs that controls the flap. You could probably just position it wherever you want it and hope it doesn't close on you under acceleration/braking.

[jbfrancis3]

Would the flap stay open or closed in that scenario?

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Closed and then everything Heinz noted. You are missing the H-bridge which is a chip that needs to be added to the DME - think of it like a relay to control an added device to a vehicle. You should consider getting the DME converted to CSL variant (by adding H-bridge) from the beginning to meet your goals. That way when the DME is flashed with the CSL software you’re all set.

Heinz is well versed has a great thread on it. I’m not an electronics persons and do not consider it a DIY. Kassel can do it and I’m sure others here can make better suggestions. So can PCS but he’s in the UK and I’d still be wary of shipping int’l at the moment.

https://nam3forum.com/forums/forum/special-interests/coding-tuning/2509-converting-an-mss54-hp-into-an-mss54hp-csl-h-bridge#post7114

[HanSooloo]

Closed and then everything Heinz noted. You are missing the H-bridge which is a chip that needs to be added to the DME - think of it like a relay to control an added device to a vehicle. You should consider getting the DME converted to CSL variant (by adding H-bridge) from the beginning to meet your goals. That way when the DME is flashed with the CSL software you’re all set.

Heinz is well versed has a great thread on it. I’m not an electronics persons and do not consider it a DIY. Kassel can do it and I’m sure others here can make better suggestions. So can PCS but he’s in the UK and I’d still be wary of shipping int’l at the moment.

https://nam3forum.com/forums/forum/s...ridge#post7114

Makes sense. I should have said that I am planning on getting the H-Bridge chip added to the DME (Kassel being the prime candidate).

Does anyone know whether 04 model year manufactured in 11/03 would already have the HP DME?

[Tbonem3]

Yes