Anyone that can hack/remap the Bosch MG1 ECU that is on the Cupra Leon V (140kW/320Nm) ?.

[Michael_LeonV]

OK, so have found out that apparently there are some shops that have been able to hack the Bosch MG1 ECU that is fitted to the base spec Mk4 Cupra Leon.

It seems to be on the basis of sending the ECU to them to rejigger (or whatever it is they do), but can anyone provide details of who does it ?

Thanks

Michael

 

[Michael_LeonV]

Some added info that I had dug up earlier with 034 Motorsports in the US

Have heard back from 034 Motorsports that they don't have anything yet to suit (was able to provide ECU & TCU software and hardware codes, so atm, that option is out.

FYI for anyone elses reference : (Note that this is an Aus delivered car)

01. Engine (EVO/29bit)
VAG Part number: 8Y0907115C
Software version: 0003
02. Gearbox (EVO/29bit)
VAG Part number: 0GC906557BK
Software version: 4161

 

[Michael_LeonV]

Ok, so it seems I'm chasing a unicorn.

I give up

 

[Michael_LeonV]

Time to raise this to the top again, as seeing some positive signs in the OS markets with MG1 ECU unlocks available for the MG1CS031 (ECU) & TC298 (TCU)

Beuller ?

 

[TVK]

The MG1CS031 can now be tuned; Autotuner, based in Luxembourg, offers this service—though you will need to send your ECU to them first.

VAG Bosch MG1CS031/MG1CS142- Mail-in Unlock

 

[Michael_LeonV]

The MG1CS031 can now be tuned; Autotuner, based in Luxembourg, offers this service—though you will need to send your ECU to them first.

VAG Bosch MG1CS031/MG1CS142- Mail-in Unlock

Cheers. I found that out on the web, so thanks for confirming that.

It seems I may have found a local tuner and checking with another, which is preferable to sending the ECU OS !

 

[Michael_LeonV]

So, have 4 local tuners (in Adelaide, SAus) that I'm talking to. 2 have confirmed based on the pic of the ECU that they can do the remap, just now waiting on the other two and then waiting will start on what they actually do, whose files they use (i.e. do they develop their own or get one from the bigger tuners in UK or US that already have developed maps etc).

Will also look at getting the TCU tune done to increase the clamp pressure (seems a simple and common recommendation).

Also started looking at a replacement dump pipe, and after google making a few errors and emails back and forth with Harding Performance here in Aus confirmed that there is a Milltek dumpipe that 'should' fit. Apparently the V and the VZ share the same part number 'Exhaust pipe, catalyst & particulate filter' (Item 1 in the image below).

This then means that this Milltek https://hp.net.au/product/milltek-s...w-sports-cat-suits-milltek-leon-formentor-vz/ Dump pipe which is meant to fit the Mk 8.5 GTi Golf & Formentor VZ/VZx (94mm / 3.7inch ID Turbo Outlet to 80mm / 3.15inch Downpipe, Pipe Ø: 3.70-inch (94.00mm)) will fit and also then requires the OPF/PPF delete.

Bummer is that it costs A$2,300

I'll keep updating this thread with data when I get it

Cheers, Michael

 

[Michael_LeonV]

Time for an update :

Received quotes from four local tuners in the Adelaide area :

• Cade Technologies : ECU Unlock + Stage 1 ECU & TCU Tune, custom developed, dyno validated, B4 & After dyno sheets, 40-60kW & 80 - 100Nm improvement, A$3,300
• Yu Performance : ECU Unlock + Stage 1 ECU Tune, TCU tune extra, custom developed, dyno validated, TCU tune recommended pending ability to unlock access, A$2,890
• Adelaide Performance Tuning : ECU Unlock + Stage 1 ECU & TCU Tune, no data on source of ECU coding, Dyno validated, A$1,895
• Euro Jap tuning : ECU Unlock + Stage 1 ECU & TCU Tune, ECU Unlock and tune data done by others (ATF Remapping in Sydney) and installed, no dyno validation, A$4500

Cade is the most likely tuner I will go with (much closer to home), so saving up the bikkies and looking at early 2027.

Next steps post ECU/TCU tune :

• Debating whether to get a downpipe or not and do a Stage 2 tune, but retain std exhaust as I don't want attention drawing noise
  • Have confirmed that a d/pipe for a VZ will fit the V (confirmed by part number and VIN)
  • Milltek SSXVW642, Scorpion SVWX064 and Supersprint #918641 are available. Only Milltek & Scorpion are availavle at a reasonable price.
    • Supersprint, IE etc all are double the best deals with Milltek & Scorpion, so outta the budget
• Given the car doesn't have LSD and is FWD, the next 'sensible' mod, whether I do a Stage 2 ECU tune w downpipe or not, would be to get an LSD fitted.
  • Already has the PP brakes installed F&R, so they are good.
  • That's my next search direction
• Next set of tyres will be gripper Pilot Sport or similar and will go to 225/40x18 (vs std 215/40x18) as they are cheaper by about A$40-$50 per tyre here in Aus.
• Car is only 2 1/2 years old and clocked 18,500km, so engine and everything else is in good nick

Had been toying with changing to an EV (Raval or Polestar 2 Performance) or proper hoon car (Leon ST VZx or Yaris GR), but the cost is crazy and the benfits few.

Now that the MG1 ECU's can be unlocked, it at least gives me an option to get the power I want and keep the car for quite a few years more. Keeping it looking stock and pretty much a quieter car, will hopefully satisfy the urge and keep me happy

Any suggestions re Downpipe & ECU Stage 2 or LSD ?