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2022 Taos SEL AWD
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Discussion Starter · #1 ·
Hey I just uninstalled my JB4/BMS tune on my SEL 4Motion after a slew of performance issues that I wanted to just share my experience in case anyone wants one. Now I could have absolutely gotten a defective one or something but it was just one thing after another.

First things first it was a BEESH to install. Took an hour and a half and that TMAP sensor is way back there and you can BARELY stick your hand back there so you need some long long screwdrivers and such. They will be your friend in trying to get that sensor off.

Once the tune is on and all the plugs are on it’s straightforward. Plug it in the OBD2 and fire up the app and start your car up. I was using Map 2 as instructed running 91 octane (since Utah is weird, that’s the highest). Drove my first couple times with it and enjoyed the power and extra kick.

The dummy lights like instructed came on and then turned off but that’s where it went south. From the 3rd drive forward it flagged the EPC EVERY TIME you drive it within the first couple miles. The EPC (electronic power control) turns your car to limp mode, reducing all turbo and boost. Now merging onto the freeway in this is going 0-60mph in about 25 seconds which is dangerous beyond belief.

I reached out to BMS just to get some support and they wanted to know what codes were posting which were P0106 and P0238 respectively. I didn’t get an answer what those codes even indicate but to try and troubleshoot some more and see what’s causing it. I unfortunately decided to uninstall it and go back to stock since it was just dangerous for my highway driving and going into limp mode every time I drive. All my lights went off, and a check engine light that appeared while the tune was installed is now gone as well.

I very well could have gotten a bad one as I’ve heard reports of bad harnesses, some bad connectors and so forth, but I just wanted to share some of my personal experience with the tune and I wasn’t overly happy with the experience considering I’ve asked for help and never got much from them to dig into the issue before I felt like I’ve given enough time (4 days of emailing to start diagnosing).

Thanks
Max
 

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those two codes are MAP and boost sensor issues which probably means 'outside expected range' for throttle position/rpm.

I don't understand why you'd need more power, its perfectly fine the way it is. I grab my LS1 if need to be pushed into my seat.

reality though. taking an aftermarket tuner on a brand new engine model is probably premature during its first year. those companies haven't had time to work out the tunes and you have no idea the reduction of life on the engine or turbo.
 

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those two codes are MAP and boost sensor issues which probably means 'outside expected range' for throttle position/rpm.

I don't understand why you'd need more power, its perfectly fine the way it is. I grab my LS1 if need to be pushed into my seat.

reality though. taking an aftermarket tuner on a brand new engine model is probably premature during its first year. those companies haven't had time to work out the tunes and you have no idea the reduction of life on the engine or turbo.
Yeah, even if you get a 10% bump in power it still won't be fast. :)
And I agree - I'd be really nervous adding a tuning box to a new car in the first year while still under warranty.
I also don't like the way it seems to work (if I understand it correctly). It looks like it just spoofs a few sensor inputs with no change to the ECU programming which seems like a pretty low tech solution. Aftermarket tuning nowadays typically requires in-depth knowledge of the ECU programming to really be able to make fairly safe, beneficial changes. Though they will usually come at some expense in terms of reliability, longevity, or economy - there's a reason the manufacturer programmed it the way they did.
 

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it is far harder and more dangerous to the system to add power to gas engines than diesels. 10% would be a large gain. spoofing timings isn't a bad way to do it, a reflash is a more traditional model. I've had a spoof based system on my truck for years. The key is what changes are made. in both methods. I don't think a few months is enough time for proper testing of this type of change if you are not the MFG and you don't know the designs and strength of every component in the system, all the way to the tires.

to each his own.
 

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2022 Cornflower Blue SE DSG 4 Motion
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I’ve been made to install these on a number of vehicles. From Audi through BMW and Porsche. Not one ever worked as stated.
They are horrible to fit. I personally think they are way too generic and trying to find a good place for the huge box is stupid. Their tech support is less than great. I remember once being told to go out and data log the car. A relatively new 911. this was a customers car and being told to go out and beat the living crap out of it so they can get logs was ridiculous. Customer support sucked too

it never really worked and we uninstalled it for a real flash tune.
 

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22 VW Taos SE FWD, Cornflower Blue
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those two codes are MAP and boost sensor issues which probably means 'outside expected range' for throttle position/rpm.

I don't understand why you'd need more power, its perfectly fine the way it is. I grab my LS1 if need to be pushed into my seat.

reality though. taking an aftermarket tuner on a brand new engine model is probably premature during its first year. those companies haven't had time to work out the tunes and you have no idea the reduction of life on the engine or turbo.
So I had the same concern re:turbo longevity. I actually emailed George from BMS a week or so ago (before I saw this) and he told me they hadn't released a JB4 for the 1.5TSI until recently even though it's been out in Europe for 5-6 years now because of the kangarooing issues, and he said they asked Euro tuners of these engines what sort of failures they saw so they could set the JB4 tune more conservative than those. After reading this I'll probably hold off for a while longer.

I’ve been made to install these on a number of vehicles. From Audi through BMW and Porsche. Not one ever worked as stated.
They are horrible to fit. I personally think they are way too generic and trying to find a good place for the huge box is stupid. Their tech support is less than great. I remember once being told to go out and data log the car. A relatively new 911. this was a customers car and being told to go out and beat the living crap out of it so they can get logs was ridiculous. Customer support sucked too

it never really worked and we uninstalled it for a real flash tune.
I'd prefer a real flash tune as well but I value my warranty and don't want to get TD1'd, so waiting it is.
 
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