Dervtech remaps

DervTech Tuning LTD are ECU calibration specialists based in North West England; offering in-house (on our chassis dyno) and remote tuning options for most BMW/MINI models. We are responsible for some of the fastest B58 & N55 powered (Mx40i/Mx35i) vehicles in the country, and pride ourselves in ensuring your vehicle drives, and performs exactly as it should.

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TheBananaStand
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Re: Dervtech remaps

Post by TheBananaStand »

Hi there,

Very interested in getting the remap and gearbox map done soon.

1 question - my car is completely standard at the moment. If you mapped it now and then in a few months I changed to a Remus cat back exhaust for example, would I need to get the car completely remapped again?

Thanks
Now: 18' M140 SE - good to be back!
Previous: 17' 420D - big mistake!
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Spin
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Re: Dervtech remaps

Post by Spin »

Nope, only need an amend if going decat or upping boost following sports cat etc.
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TheBananaStand
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Re: Dervtech remaps

Post by TheBananaStand »

Perfect, thanks!
Now: 18' M140 SE - good to be back!
Previous: 17' 420D - big mistake!
Previous: 65' AW M135i 3dr with a few bits n bobs :D
Previous: 13' Black Peugeot 208 GTi
Mr Whippy
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Re: Dervtech remaps

Post by Mr Whippy »

Hey Jammapic!

How goes? Finally come back to BMW? Good choice haha.


Did you just go on a damos hunt, use software with maps defined (good sw), or use a simulator, or do a decompile?

I’m especially interested in the gearbox tuning. I’ve a 335xd here, still under warranty, but would like to have a play in a years time at 3yr old... the standard shift points are definitely a weak point on the diesel.

The 140i I drove didn’t seem half as bad.



PS, if gearbox has torque limiters on auto, I assume manual box isn’t limiting engine torque... but does the ECU have some torque limiters still set for per-gear on manual?
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump
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jammapic
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Re: Dervtech remaps

Post by jammapic »

Never been out of a BMW Dave...

328i e46, 325i e36, r53 mini, e46 m3, f56 JCW mini, e36 328i (still have), m240i (still have).

Also had a string of sh*t lease cars at the same time 🤭

Originally bought DAMOS, bought our m240i manual and M140i development cars and had at them until it was perfected.

Bear in mind, we’ve had 4 years with the F56 MINI, about 6 years with n20 / n55 which use a similar ECU, albeit the older version, and before that R56 turbo JCW still with the earlier version still.

Bosch ME and MG systems all following a similar concept, with nuances between generation and vehicle model.

The gearbox thing was trickier, because there was no info about them... seemingly no one tunes them, there’s no DAMOS etc.

Lots of reads from lots of cars, with different engines and piece it together will show you what changes across the same hardware platform.

In the auto box, there’s a maximum torque permissible that’s passed to the engine ECU. That’s why tuning boxes still work, because the ECU doesnt actually KNOW what torque is being put out. The signal is “bent”.

Both auto and manual have torque limitation in them, as well as cylinder fill limits and load limitation... obviously the manual box doesn’t have a “limit” as such... but clearly there will be a mechanical limit in the clutch.

There’s a load in the box... but shift points, shift speed, rpm matching etc are what we have been primarily working on...!

Great to hear from you mate.

JP @ DervTech
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Re: Dervtech remaps

Post by platinum70 »

Has anyone gone from either JB4 or TMC Tuning box (or similar) to the Dervtech set up? Intrigued to know if there is an improvement (aside from the obvious custom map against piggy back ECU of course). Very interested in this.
MG M140i, auto, 5dr, pro nav, all packs, big smiles.....
Ry_B
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Re: Dervtech remaps

Post by Ry_B »

If the gearbox has torque limits etc isn’t it risky to remove these as presumably they are there to protect it from too much torque ?
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jammapic
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Re: Dervtech remaps

Post by jammapic »

Ry_B wrote: Mon Nov 26, 2018 6:23 am If the gearbox has torque limits etc isn’t it risky to remove these as presumably they are there to protect it from too much torque ?
Mainly there to fall in line with the actual engine torque. The ZF8 is almost exactly the same used across the board in the BMW range... if you have a poke around in a 35d/40d gearbox map, there are a few things differently set to support the torque.

I’ve never read off an x50d gearbox map, but suspect that’s more again...
platinum70 wrote: Mon Nov 26, 2018 12:15 am Has anyone gone from either JB4 or TMC Tuning box (or similar) to the Dervtech set up? Intrigued to know if there is an improvement (aside from the obvious custom map against piggy back ECU of course). Very interested in this.

Lots of people have... I usually post the comparison dyno plots on our Facebook page when we do them. There’s another one coming probably today or tomorrow too if I get the time.

JP @ DervTech
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Re: Dervtech remaps

Post by platinum70 »

platinum70 wrote: Mon Nov 26, 2018 12:15 am Has anyone gone from either JB4 or TMC Tuning box (or similar) to the Dervtech set up? Intrigued to know if there is an improvement (aside from the obvious custom map against piggy back ECU of course). Very interested in this.

Lots of people have... I usually post the comparison dyno plots on our Facebook page when we do them. There’s another one coming probably today or tomorrow too if I get the time.

JP @ DervTech
[/quote]

Many thanks JP. I assume the only way to do this is a visit to Manchester? That would be the only stumbling block for me. Being down in West Sussex it is not exactly a short journey!
MG M140i, auto, 5dr, pro nav, all packs, big smiles.....
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jammapic
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Re: Dervtech remaps

Post by jammapic »

I’m afraid so. We ONLY offer tuning for these here, on the dyno.

They are very new (and expensive!) so we feel it’s imperative to fully data log, and test each one ourselves.

We don’t want to leave any stone unturned !
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Spin
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Re: Dervtech remaps

Post by Spin »

Hey JP, what are your thoughts/findings on fuel used ? I tend to use Tesco 99 just out of convenience, any idea what fuel performs the best etc when mapped ?

Shell Nitro is a good 15p per litre more around here !
15 F21 135i Auto
16 RS3
66 Golf R
17 M140 Man SE
17 M140 auto SE
F87 M2 Manual LBB
16 M235i auto
19 M140 SE - B12 Kit

MX5 mk1 SE for sunny days & back to basics.
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jammapic
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Re: Dervtech remaps

Post by jammapic »

Spin wrote: Mon Nov 26, 2018 4:48 pm Hey JP, what are your thoughts/findings on fuel used ? I tend to use Tesco 99 just out of convenience, any idea what fuel performs the best etc when mapped ?

Shell Nitro is a good 15p per litre more around here !
Hi.. we use Costco 99RON in ours... cheap and gives good power.
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platinum70
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Re: Dervtech remaps

Post by platinum70 »

jammapic wrote: Mon Nov 26, 2018 3:35 pm I’m afraid so. We ONLY offer tuning for these here, on the dyno.

They are very new (and expensive!) so we feel it’s imperative to fully data log, and test each one ourselves.

We don’t want to leave any stone unturned !
Thanks JP and perfectly understand. I get good power from the more 'crude' system and the 9 odd hour drive (there and back) isn't massively appealing!But something to consider for sure....
MG M140i, auto, 5dr, pro nav, all packs, big smiles.....
Clucky
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Re: Dervtech remaps

Post by Clucky »

Hi JP,

I have a manual M140i, is the map also suitable to the manual box?

Please excuse what might be a n00b question, but it was previously mentioned that there is some kind of patch so that it's undetectable. Does this mean that in the event of a warranty claim with BMW that they would not be able to see that it has been mapped?

I currently run a Bluespark which has been great but on setting E (max), its a bit 'jumpy'. Looks like your maps will be much smoother. I have noticed that my manual box seems to have a synchro issue on first and second gear. BMW couldn't detect it but said just wait till it gets worse and happens more often and then bring it back. Is this because the manual can't take the added torque of the tune?
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Re: Dervtech remaps

Post by Mr Whippy »

jammapic wrote: Sun Nov 25, 2018 10:45 pm Never been out of a BMW Dave...

328i e46, 325i e36, r53 mini, e46 m3, f56 JCW mini, e36 328i (still have), m240i (still have).

Also had a string of sh*t lease cars at the same time 🤭

Originally bought DAMOS, bought our m240i manual and M140i development cars and had at them until it was perfected.
Ah I didn’t realise you’d kept the E46 328 (didn’t you get RACP warranty work on that one?) while you had the TDi project cars.

BMWs are hard to beat.

Obviously in the last 11 years you’ve had a few more cars haha!


That’s very interesting on DAMOS then tuning. Working on your own car on road is such a nice way to get it perfect, vs dyno work only, or never really having the time to go on road over thousands of miles.

Also comparing reads. For me that’s where I found most useful stuff back in the day.
I guess there is no shortage of ZF8 apps to read out to see what’s what!



Possibly a subject for another topic, but do you have a 335xd LCI and Alpina B3 diesel gearbox map to compare?

I’ve read Alpina mapping is a nice upgrade but I think the best upgrade is DIY.

Like I said it’s the only weak point really, way too eager to drop gears rather than get stuck into the ample torque.

Oh and the naff pea shooter exhausts haha.
130i LE - exhaust flap mod - ssk & bmwp & M3 gbox mounts - bmwp handbrake - bmwp steering surround - camber pin mod - cdv delete - koni SA & bmwp front bump & koni rear bump
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