12-30-2020, 10:55 AM | #1 |
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Stage 2 tune and mid throttle issue
I have a local tuner that unlocked my DME and provided me with a stage 2 tune for BMS intake, E30, and catless AA dp. The car gets great mileage when cruising back and forth to work (at or close to 30mpg!), great normal stocklike drivability when off boost, very strong acceleration when flat out (put a couple cars on a buddies 1LE Camaro with FBO and cam 60-130) but at mid throttle there is what feels like a torque limiter or something that will hold me back until I push down on the pedal enough for it to drop a gear. Basically if I am headed up the onramp to the highway and picking up speed not trying to floor it but need to get up to speed the car starts to make boost as I'm lightly on the gas and then hits almost like a dead spot where it will not accerlerate any more unless I keep pressing down. Then it drops a gear and wants to take off like a monster. I can easily drive around the issue by playing with the throttle but it is not a smooth transition of spool and power. It almost feels like the boost blows off or a torque limiter that wont let me accelerate anymore until I give it a fair amount more pedal (enough to downshift) when the gear it is in would be fine if it would just allow the spool of the turbo to continue. Its hard to explain to the tuner and recreate without a lengthy test drive. I don't think it is the intake because I put that on a few days before the tune and never noticed it before the tune. Just curious if any other tuned guys have noticed any strange quirks like this with your tune. I have talked with the tuner about it and he even made some revisions the last time I was there after the catless dp. The throttle is very sensitive which I like and it is still very drivable and fast. No check engine lights or any other issues. If I am driving like a baby or very aggressive you would not notice. Its just in between that there is this strange power wall at mid throttle that I either have to back off and try again or push through/past.
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2020 M340i Xdrive Portimao
AA catless downpipe (offroad only of course) BMS intake and Inlet tube H&R Springs MHD Stage 2 E40 |
12-30-2020, 12:41 PM | #2 |
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I have not experienced anything like that with my Stage 2 Mission Performance flash. That said, if you haven't done it already (sorry if I missed it) I would run some logs for your tuner (or with your tuner)...
I'm sure based on that information they will be able to identify the problem and remedy the situation for you. If they can't...you are already unlocked so you can likely return to stock and flash with (MP, BM3, MHD etc...) Good luck and let us know how it goes. |
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12-30-2020, 08:34 PM | #5 |
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Thanks for all the responses! I would love to get some logs, I am used to having that capability from my past experience with SCT flash tools on my Mustangs. Unfortunately this is a local tuner (don't know of any others around) that simply pulls my ecu out of the car, makes tune adjustments and sends me on my way. I am talking to him about buying a Powergate flash tool which I believe may give me more options for logging and having multiple tunes to choose from. That way I don't have to keep driving back and forth to his shop every time I want to change something. I agree with everyone saying a torque limit issue as this is what it feels like to me. I am experienced with 25+ years of working on tuned cars, this is just my first Euro. Especially this modern and advanced with electronic nannys. I am also seriously considering starting all over with Mission now that the DME is unlocked. It seems they have this figured out better then anyone. I really would like to have my remote start back even if it means leaving the key card in the tray. My tuner is also having trouble getting the performance gauges to match. My torque gauge maxes at 560 but the horsepower is still at 400. I know that has zero to do with performance and its just a stupid toy but it still bothers me that they don't match. He has tried to fix it twice without success. Don't get me wrong, the car starts and runs great and is very fast. I still think the $700 price for unlock and tune was worth it but I do want it to drive perfect in all respects, my remote start to work, and my gauges to scale correctly. It looks like to recreate what I have with Mission will cost close to $1200.
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2020 M340i Xdrive Portimao
AA catless downpipe (offroad only of course) BMS intake and Inlet tube H&R Springs MHD Stage 2 E40 |
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12-31-2020, 11:14 AM | #7 | |
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Not sure if that is a holiday sale price or if Alex dropped his prices permanently...either way hope it helps With your DME now unlocked you can do the flash with a PC at home with any of the majors. |
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12-31-2020, 11:30 AM | #8 | |
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2020 M340i Xdrive Portimao
AA catless downpipe (offroad only of course) BMS intake and Inlet tube H&R Springs MHD Stage 2 E40 |
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12-31-2020, 11:41 AM | #9 | ||
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I wasn't aware of the sale price until yesterday...so figured I'd drop you an FYI post... Happy New Year (almost) ps- jealous of your xdrive - really wanted one and was going to order but when COVID hit that option disappeared so had to grab something off the lot and not surprisingly not too many xdrive m340's on the lot in SoCal |
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12-31-2020, 11:47 AM | #10 | |
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2020 M340i Xdrive Portimao
AA catless downpipe (offroad only of course) BMS intake and Inlet tube H&R Springs MHD Stage 2 E40 |
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12-31-2020, 01:08 PM | #11 | |||
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12-31-2020, 02:06 PM | #12 |
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that issue is 100% comming from the torque limiters. had same issues
with my mhd stage 2 tune. bmw and zf locked dme's very hard. check out mg flasher. they have a great solution. i have no longer that issue. car is running great... map is not final yet but my m340i does 510-530hp at the crank and 730nm torque. mg flasher fixed that with a special custom code. so you can adjust the limiter on your own. i put the limiter in at 750nm. you can rise it up to 1000nm |
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12-31-2020, 02:20 PM | #13 | ||
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