[F87source]

Originally Posted by Leaveatrail86

Gotcha. I have the pr kit so the .30 should work more than ok. I know you said that before f87source. Have rough idle but drives fine elsewhere.

Yeah with a coil upgrade kit, chances are you can run stock gap up to 550-600 whp before needing to gap down.

[ZM2]

Originally Posted by F87source

+1

The way it should be done, gap down only when necessary, i.e. run the largest gap possible with the stock gap being the upper limit.

Just to be clear, 0.030” is what the NGK’s are set at out of the box. Not necessarily, M2 stock gap.

Purrs like a kitten and super strong power!

[F87source]

Originally Posted by ZM2

Just to be clear, 0.030” is what the NGK’s are set at out of the box. Not necessarily, M2 stock gap.

Purrs like a kitten and super strong power!

Technically BMW doesn't even list the stock gap size in ISTA, but I have heard it is around 0.030"-0.032", so as long as it is in that range using whatever the stock plugs are set at as a starting point should be fine.

[AmuroRay]

Any codes?

[ZM2]

Originally Posted by uhohitzkuke

Hi all,
I recently installed my PTF plug and play flex fuel sensor and have mixed California 91 octane with E85 to get around a 26/27% ethanol blend that I have been running on the Stage 2 Multimap Flex Fuel map. I have an upgraded intercooler and catted downpipe; everything else is stock.

I've been running this setup for the past couple of weeks with no issues until today. I was on a freeway on-ramp and went WOT in 2nd gear until it reached 6k rpm, then the power cut off and CEL flashed. The drivetrain malfunction but ok to continue slowly message came up. Engine was vibrating and running rough; I pulled over to shut the car off. Looks like I had misfire codes for three cylinders and checked my exhaust pipes to find piles of ash material and fuel in there...

I've retired the car and it's sitting in my garage atm... How royally effed am I? Car seems to start up fine and CEL's are gone, but the fuel and ash material in the tail pipes are concerning. At first I thought they were metal shards of engine but they weren't shiny or dense... Could it be packing material from my downpipe scorched from hot and unburnt fuel during the misfiring? Or is my engine effed?!

Anyone have a good idea of what happened and what I should do next?

Like AmuroRay said, any codes?

Also, to be clear, you're running the Stg 2 MM, and not the Stg 2+ MM, correct? The later requires E40-60.

Any kind of small misfire can turn into a large one under load esp at high RPM, and put the car into limp mode. I know there's already a ton of spark plug talk here, but what plug and gap are you running--still stock it sounds? Still factory coils? How many miles on them?

[ZM2]

Originally Posted by uhohitzkuke

I mistakenly cleared the codes when I was scanning them but they were the codes for misfiring and injector shut off for three cylinders.

Yes, I'm running Stage 2 MM flexfuel on the acn91 octane map, not stage 2+.

Stock spark plugs (and gap whatever that may be) and coils. I'm at 25k miles.

I’d get new plugs (leave stock gap) and coils and try again.

[uhohitzkuke]

Should I do any troubleshooting or other litmus tests to know it's safe to drive before doing so? Or am I just being ultra conservative here?

[calvin07]

Hey guys,

So I have ran into a problem, and I am looking to find out what the cause may be. Here are my mods:

Catless Downpipe
Charge pipe
Intercooler
BM3 Flex Fuel Kit

Running E30 on BM3 Stage 2 Multi Map with 93 octane tune

My problem is when going WOT around 5.5K rpm, the engine cuts the power. It feels like someone stepped on the breaks. I have tried this on 3rd and 4th gear and the result is the same. Outside temperature is between 40-45F. I don't get CEL or anything and the car drives normally right after. I can do pulls 80-90% throttle just fine. This is only at WOT. If I am driving 80-90% throttle, it goes normally until redline.

Any ideas what this could be? I am assuming it's the HPFP but I don't know. I don't have any logs at the moment but I can do some logs if it would help.

Thanks.

[ZM2]

Originally Posted by calvin07

Hey guys,

So I have ran into a problem, and I am looking to find out what the cause may be. Here are my mods:

Catless Downpipe
Charge pipe
Intercooler
BM3 Flex Fuel Kit

Running E30 on BM3 Stage 2 Multi Map with 93 octane tune

My problem is when going WOT around 5.5K rpm, the engine cuts the power. It feels like someone stepped on the breaks. I have tried this on 3rd and 4th gear and the result is the same. Outside temperature is between 40-45F. I don't get CEL or anything and the car drives normally right after. I can do pulls 80-90% throttle just fine. This is only at WOT. If I am driving 80-90% throttle, it goes normally until redline.

Any ideas what this could be? I am assuming it's the HPFP but I don't know. I don't have any logs at the moment but I can do some logs if it would help.

Thanks.

Def sounds like HPFP.

[Insane435]

Originally Posted by ZM2

Def sounds like HPFP.

I agree. I had the same issue on the e30 map in cooler weather. Id get a hpfp if you want to run E.

[designatedposter]

a log would confirm if its hpfp.

another potential cause that is less obvious is misfires due to weakened ignition system or spark blow out at max boost. you could correct spark blow out by decreasing the spark plug gap.

[calvin07]

I will try to do a log and will need help reading it bc I wouldn't know what I'm looking at.

Also, if I need to get a hpfp, are there any advantages of going with Dorsch stage 2 compared to stage 1? I am planning on staying with the stock turbo.

[Insane435]

Originally Posted by calvin07

I will try to do a log and will need help reading it bc I wouldn't know what I'm looking at.

Also, if I need to get a hpfp, are there any advantages of going with Dorsch stage 2 compared to stage 1? I am planning on staying with the stock turbo.

I have stage 1 on stock turbo. No reason for stage 2.

[ericlr1225]

Originally Posted by calvin07

Hey guys,

So I have ran into a problem, and I am looking to find out what the cause may be. Here are my mods:

Catless Downpipe
Charge pipe
Intercooler
BM3 Flex Fuel Kit

Running E30 on BM3 Stage 2 Multi Map with 93 octane tune

My problem is when going WOT around 5.5K rpm, the engine cuts the power. It feels like someone stepped on the breaks. I have tried this on 3rd and 4th gear and the result is the same. Outside temperature is between 40-45F. I don't get CEL or anything and the car drives normally right after. I can do pulls 80-90% throttle just fine. This is only at WOT. If I am driving 80-90% throttle, it goes normally until redline.

Any ideas what this could be? I am assuming it's the HPFP but I don't know. I don't have any logs at the moment but I can do some logs if it would help.

Thanks.

Originally Posted by ZM2

I’d get new plugs (leave stock gap) and coils and try again.

Thought I'll just quote both of you guys since it's related to my issue(fixed now)
Updates:
Sorry for the late update, dorch got back-order cost me a loooooong time, also I had a family issue and working issue got me stopped working on the car and Just got back to it couple days ago.

Here is what I've done since hpfp issue happened.
1. Turn spark plugs back to new borch OEM (oem gapped). datalogs shown not related
2. Got a set of new OEM injectors(original ones are in perfect condition), new Eldor coils(old delphi are working good). datalogs shown not related
3. Checked boostleaks, hardware connections, Maf sensors, hpfp sensors, O2 sensors, EKPM(switched to secondhand bought from ebay then back to old one). switch back to OEM T-map sensor from 3.5 bar continental one, datalogs shown not related.
4. then the final one LOL, I put dorch stage 2 hpfp on when it arrived, and datalogs shows fuel pressure is perfect now. Also the car feels more powerful with stock tune.

It turns out the problem is the last thing I will consider --- HPFP. Older one is not perform consistently or let's say it fails under pressure. And I was having "cutting power" issue same as you posted. If I pushed too far, it would turn into misfire/limp mode. smoked exhaust, weird smell. Please noted my car is low mileage and only daily since I bought it. All other parts are in great condition. Conclusion: 2018 BMW M2 hpfp does fail!!!

After testing stock tune with new hpfp, I flashed stage 1acn then stage 2 acn maps and the problems never come back. (Just knocks at around low rpm every WOT). No CEL no codes, I blame on CA 91 gas. Any suggestions? thanks.

5. I installed FlexFuel kit and ready to give Stage2+ MM a try.

Next I'm planning to run 3 tank E40mix then 1 full tank pump 91gas just to lubricate/clean the fuel system, learned from this forum. Do I need to flash back to 91 tune at gas station or stage2+MM map will auto adjust it. If running just Stage 2+ E30 map only, would flexfuel sensor function still work?

Thanks a lot guys! Cheers!

[ericlr1225]

https://www.bootmod3.net/log?id=63d0...0b4397bb16816e
https://www.bootmod3.net/log?id=63d0...729bc11c540d79

[ZM2]

Originally Posted by ericlr1225

5. I installed FlexFuel kit and ready to give Stage2+ MM a try.

Next I'm planning to run 3 tank E40mix then 1 full tank pump 91gas just to lubricate/clean the fuel system, learned from this forum. Do I need to flash back to 91 tune at gas station or stage2+MM map will auto adjust it. If running just Stage 2+ E30 map only, would flexfuel sensor function still work?

Thanks a lot guys! Cheers!

Stg 2+ MM will only drop back down to 93 octane with the FF sensor. You have to use Stg 2 MM to auto adjust down to 91 ACN.

I’d also get the Bend Calibration fuel filter to help protect all the new parts you just put on.

[ericlr1225]

Originally Posted by ZM2

Stg 2+ MM will only drop back down to 93 octane with the FF sensor. You have to use Stg 2 MM to auto adjust down to 91 ACN.

I’d also get the Bend Calibration fuel filter to help protect all the new parts you just put on.

Ouch~ another $700 to go, I watched some posts related to the filter. It looks decent and effective. I'll def consider about it.
Also it Looks like the only downside of MM is it would stop me to add more E85 (to clear timing) for lower power map. for example add up to E40 just to run E30/93 map.

[ZM2]

Originally Posted by ericlr1225

Ouch~ another $700 to go, I watched some posts related to the filter. It looks decent and effective. I'll def consider about it.
Also it Looks like the only downside of MM is it would stop me to add more E85 (to clear timing) for lower power map. for example add up to E40 just to run E30/93 map.

The Multimap will scale timing to any Emix (10-85%).

[calvin07]

Originally Posted by ericlr1225

It turns out the problem is the last thing I will consider —- HPFP. Older one is not perform consistently or let's say it fails under pressure. And I was having "cutting power" issue same as you posted. If I pushed too far, it would turn into misfire/limp mode. smoked exhaust, weird smell. Please noted my car is low mileage and only daily since I bought it. All other parts are in great condition. Conclusion: 2018 BMW M2 hpfp does fail!!!

After testing stock tune with new hpfp, I flashed stage 1acn then stage 2 acn maps and the problems never come back. (Just knocks at around low rpm every WOT). No [...]

Nice. Let us know how yo do with the stage 2+ MM.

As far as I know you flex fuel sensor won't work with regular stage 2+ map. It has to be the MM.

I'm going to order the stage 1 hpfp since I don't plan to upgrade the turbo.

Were you also getting knock at low rpm at wot before the hpfp upgrade?

[ericlr1225]

Originally Posted by calvin07

Nice. Let us know how yo do with the stage 2+ MM.

As far as I know you flex fuel sensor won't work with regular stage 2+ map. It has to be the MM.

I'm going to order the stage 1 hpfp since I don't plan to upgrade the turbo.

Were you also getting knock at low rpm at wot before the hpfp upgrade?

Yes!! I thought it was cuz my OEM hpfp related but knocks still happened after dorch stage 2 hpfp installed.

[ericlr1225]

Originally Posted by ZM2

The Multimap will scale timing to any Emix (10-85%).

Got it, awsome! So what's the meaning of the 4 maps inside of MM?

[ZM2]

Originally Posted by ericlr1225

Got it, awsome! So what's the meaning of the 4 maps inside of MM?

https://f87.bimmerpost.com/forums/sh...5&postcount=31