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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > Kerma Stage 2 328D
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      09-21-2020, 10:50 PM   #1
obiwantoby
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Kerma Stage 2 328D

Have any folks used the ‘Stage 2’ option with transmission tuning? Seems a bit sparse in info, but I am not quite sure what changes they were wanting to make with the transmission. Seems like the tune is a bit more aggressive than their stage 1 with the same components?
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      09-22-2020, 12:30 AM   #2
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Yup, I've been running stage 2 for a decent while now (I'll have to dig though my logbook to get exact mileage/time), but it's been well worth it for me. The more efficient power transfer is most noticeable in city driving, and my fuel economy increased a bit over stage 1. Due to the increased engine output, it allows the trans to upshift and hold a higher gear (it'll let me cruise at 1000-1100rpm vs about 1500rpm before). Since it does allow the engine revs to get lower though, it takes a bit longer to get into the main powerband when stepping on it from that rev range, so it doesn't feel quite as smooth as stage 1.

Stage 2 doesn't really change the engine tuning much (so the engine isn't really making much more power than stage 1), it's really more tuning the lower rev engine characteristics to match the trans tune better down there, and tuning the transmission so that it is better matched with the new increased engine output, thus more efficiently delivers power to the wheels.
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      09-22-2020, 07:58 AM   #3
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I have stage 1. How do you get stage 2? I didnt see it as an option on the website?
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      09-22-2020, 09:54 AM   #4
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n00bkiller944 - https://kermatdi.com/i-2836-bmw-328d...available.html | looks like the link. Curious about the need for a laptop to do the transmission flash and what that would/will look like.
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      09-22-2020, 11:39 AM   #5
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Looked through my log book, I've had stage 2 for a 14,548mi and just under 14mo.
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      09-22-2020, 11:44 AM   #6
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It's much more about using high rpm horsepower, which greatly changes how the car accelerates. A bit more low rpm torque is allowed as well, but not much more to cause issues.
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      09-25-2020, 08:51 PM   #7
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Quote:
Originally Posted by n00bkiller944 View Post
I have stage 1. How do you get stage 2? I didnt see it as an option on the website?
I thought I didn’t until recently either. Either way “Stage 2” seems to be quite the price premium over Stage 1. Not seen too much talk about Stage 2 to figure out the worth proposition here. Not really a popular platform so I guess less comparisons.
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      10-02-2020, 08:03 PM   #8
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Quote:
Originally Posted by obiwantoby View Post
Quote:
Originally Posted by n00bkiller944 View Post
I have stage 1. How do you get stage 2? I didnt see it as an option on the website?
I thought I didn’t until recently either. Either way “Stage 2” seems to be quite the price premium over Stage 1. Not seen too much talk about Stage 2 to figure out the worth proposition here. Not really a popular platform so I guess less comparisons.
It looks like an alternative to Stage 1 + xHP transmission tune.

FaRKle! , is this the only other commercially available transmission tune for our cars that you're aware of? I've been debating Kerma Stege1 plus xHP, but this seems like a great alternative...although does Stege2 come with customizable options for the trans tune, like xHP?
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      10-29-2020, 11:59 AM   #9
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FaRKle! Does the KermaTDI stage 1 tune actually live up to its 50whp and +70lb-ft to the wheels increase over stock?
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      10-30-2020, 11:54 AM   #10
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Quote:
Originally Posted by haagm58 View Post
FaRKle! , is this the only other commercially available transmission tune for our cars that you're aware of? I've been debating Kerma Stege1 plus xHP, but this seems like a great alternative...although does Stege2 come with customizable options for the trans tune, like xHP?
Yes, aside from xHP, which I'm not sure has a profile explicitly for the KermaTDI tune, this is the only other transmission tune I'm aware of. It doesn't have customizations like xHP though.

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Originally Posted by Collins_F31 View Post
FaRKle! Does the KermaTDI stage 1 tune actually live up to its 50whp and +70lb-ft to the wheels increase over stock?
It certainly feels like it. I've been mulling over doing a dyno test on my vehicle in RWD and AWD modes to see the difference so I guess I'll see for sure then (I haven't scheduled this though).
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      11-01-2020, 02:25 PM   #11
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Quote:
Originally Posted by FaRKle! View Post
Yes, aside from xHP, which I'm not sure has a profile explicitly for the KermaTDI tune, this is the only other transmission tune I'm aware of. It doesn't have customizations like xHP though.



It certainly feels like it. I've been mulling over doing a dyno test on my vehicle in RWD and AWD modes to see the difference so I guess I'll see for sure then (I haven't scheduled this though).
hello sir! Been reading up a bit on possibly power increase mods for the US spec 328d F31 wagon. In your opinion, aside from the KermaTDI stage 1 tune, whats the best bang for your buck power upgrades for the N47?
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      11-01-2020, 07:15 PM   #12
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Quote:
Originally Posted by Collins_F31 View Post
Quote:
Originally Posted by FaRKle! View Post
Yes, aside from xHP, which I'm not sure has a profile explicitly for the KermaTDI tune, this is the only other transmission tune I'm aware of. It doesn't have customizations like xHP though.



It certainly feels like it. I've been mulling over doing a dyno test on my vehicle in RWD and AWD modes to see the difference so I guess I'll see for sure then (I haven't scheduled this though).
hello sir! Been reading up a bit on possibly power increase mods for the US spec 328d F31 wagon. In your opinion, aside from the KermaTDI stage 1 tune, whats the best bang for your buck power upgrades for the N47?
Find FaRKle! 's YouTube channel, he has a lot of good info there. Also search the form for his threads.
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      11-01-2020, 07:26 PM   #13
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Quote:
Originally Posted by haagm58 View Post
Find FaRKle! 's YouTube channel, he has a lot of good info there. Also search the form for his threads.
Yes! Farkle has lots of great youtube videos I plan on using when installing my suspension parts in the future! Im also just curious as far as power upgrades what most people are doing to their 328d N47 to make it a bit quicker.
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      11-01-2020, 08:52 PM   #14
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A tune is the only real option. I’ve had the Kerma tune for about 10 months and love it, I think it’s definitely worth the money.
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      11-02-2020, 09:11 AM   #15
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Originally Posted by EricD735i View Post
A tune is the only real option. I’ve had the Kerma tune for about 10 months and love it, I think it’s definitely worth the money.
I will definitely be getting the KermaTDI stage 1 tune here shortly. This being my first diesel BMW, ive read a good bit about how minimal the power increase is in exhaust upgrades/down pipes, etc. Aside from the tune and an obvious turbo/engine internals upgrade, but at the end of the day it's still only an N47. If only we got the 335d in the states
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      11-02-2020, 09:44 AM   #16
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Quote:
Originally Posted by Collins_F31 View Post
Yes! Farkle has lots of great youtube videos I plan on using when installing my suspension parts in the future! Im also just curious as far as power upgrades what most people are doing to their 328d N47 to make it a bit quicker.
I didn't know he had a suspension video? I will have to check it out. Doing full overhaul here soon!
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      11-02-2020, 01:52 PM   #17
FaRKle!
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Quote:
Originally Posted by Collins_F31 View Post
hello sir! Been reading up a bit on possibly power increase mods for the US spec 328d F31 wagon. In your opinion, aside from the KermaTDI stage 1 tune, whats the best bang for your buck power upgrades for the N47?
EricD735i said it well. There's not really any other mods that really help power on this platform aside from a tune. That said, a larger intercooler can help if you frequently encounter use cases where your charge air temps are getting really high. Just have to be careful not to go too large on this platform because the lag is augmented.

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Originally Posted by n00bkiller944 View Post
I didn't know he had a suspension video? I will have to check it out. Doing full overhaul here soon!
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