Chip Tuned

Jesus! What did I say?

Has this been covered extensively elsewhere?

I'm keen to find out more too Pipes

....by Dinan. Mainly because the US-spec cars were down on power compared to the Euro ones, so all they were doing was playing catch-up in most cases.

If it's replaceable chips you're looking at, then Superchips, BBR or Jayson (ChippedUK) are usually the way to go, but really only post-1985/6 cars can be dealt with. "Highlines" are better suited to this treatment.

Jayson reckons he can re-programme or remap some of the earlier cars (Motronic 2.1 ECUs, normally coded "011" by Bosch), but the chip itself cannot be taken out and replaced by another because Bosch hard-wired these early ones in.

Re-mapping has had some UK coverage already, mainly from owners of M635CSis (all years) who have discovered themselves to be down on power over the years..... Also, the "Highline" edition of the M635CSi sometimes didn't leave the factory with the full 286hp....

Edited by Horsetan

To find out which version ECU you've got in your car, CLICK HERE and scroll down to read the full list

1986 C Reg 635csi auto

ChippedUk said this (no idea what it means):

We can do this ecu but you are tied with what can be
altered. We can get around 11hp on this ecu with
direct flash of the main eeprom by removing the ecu
and mapping it direct with an emulator.

Jayson - is there anything worth doing to mine?

1981 635csi

229bhp(for 218bhp cars) potentially then.....thats nearly e46 330i territory is that

11hp is it worth the money? Although I guess it's
fairly hassle free compared with other engine mods.

Would the gains be that noticeable?

Pipes wrote: 11hp is it worth the money? Although I guess it's fairly hassle free compared with other engine mods. Would the gains be that noticeable?

Seeing how many of the unchipped cars were down on power during the TBMW rolling road day there's a fair chance your car (& mine!) aren't delivering the full whack.

You have to ask yourself, "Am I bovvered?". Unless you're enterinhg the car in some sort of motorsport competition a few bhp here or there isn't going to make any difference really.

What you will gain is a more lively response to the throttle which should make the car nicer to drive. Dave Jerrome said it's like having the car in sport mode.

Highlines are said to be more responsive to chip tuning than earlier cars.