From Audi 100 to urS4 in a week

[hunker7]

I've done little miles on both ECUs, and ECU from grey one shows better mpg than the ECU from red one. On red one it was usually 16mpg going to my girlfriends, by the time I get back it's 14mpg, this one was around 18 all the way.

[UrS4boy]

Some OE MAP and chip part numbers:

Bosch Motronic ECU FAQ
Part Numbers

Pressure Transducers

Bosch 0.273.003.210 (250 kPa)
Bosch 0.273.003.211 (300 Kpa)

'92 Stock chips
TOP 1.267.357.391 (L27C512E/321063)
BOT 1.267.357.394 (7142437NBB, Intel B57 922 U2090657)

'93 Stock chips
TOP 1.267.357.391 (TI / B 58 157 / LEP9206 / L27C512E/321063)
BOT 1.267.357.483 (TI / B 58 235 / LDP9349 / L87C257D/301687)

'95 Stock chips
TOP 1.267.357.391 ??13 (TI -20JT / B 58 157 / BLUP9431690 )
BOT 1.267.357.483 S933 (TI -20JT / B 58 235 / LD4CA47EP )

Hoppen MTM Stage 1+ Mod:
TOP MOT S4 3.0 264 PS HS Key 02.10.97 39EA
BOT LDR S4 3.0 264 PS HS 02.10.97 9B55

I have seen 1.267.357.248 before (I think) but I can't find a reference for it.

[hunker7]

So it's all standard in there?
Is it possible to buy fuel chips?

[UrS4boy]

So it's all standard in there? Is it possible to buy fuel chips?

All? I only see a photo of the fuel chip, nothing for the boost chip.

There is something about the 1.267.357.248 chip that is bugging me but, for the moment, I can't find a reference as to why. (Like very early chip set).

If the boost chip has a "normal" PN on it, it might be possible to get a fuel chip from somebody with an AAN who has upgraded their ECU with Stg 1 or Stg 1+ chips sets. Normally chips are sold in matched pairs.

[hunker7]

All? I only see a photo of the fuel chip, nothing for the boost chip.

There is something about the 1.267.357.248 chip that is bugging me but, for the moment, I can't find a reference as to why. (Like very early chip set).

If the boost chip has a "normal" PN on it, it might be possible to get a fuel chip from somebody with an AAN who has upgraded their ECU with Stg 1 or Stg 1+ chips sets. Normally chips are sold in matched pairs.

PN on the other chip is 1 267 357 250

Where could I look for both chips?

[UrS4boy]

PN on the other chip is 1 267 357 250
Where could I look for both chips?

At least the one with 250 at the end of the PN would seem to be of the same era as the 248 chip.

Normally I wouldn't say this until you have your issues sorted out but due to the fact that the ECU is already socketed, I would suggest that you consider getting a "Stage 1" chipset (for the 250 kPa MAP sensor) from either Paul Nugent (S2Central.net) or pry (dmitri). You would get more horsepower (around 260) and better mileage (this assumes that you don't have a fuel supply issue - which I am still convinced of).

Otherwise, put a WTB advert in the Wanted section here, asking for a known to be good UrS4 chipset with the 92 or 93 PNs I posted earlier today. Should be quite inexpensive (because normally people remove them and never use them again after they upgrade to Stage 1 and behond).

[UrS4boy]

I have seen 1.267.357.248 before (I think) but I can't find a reference for it.

Okay I found the "reference". It was a fellow Canadian (in Calgary) with a 92 spec UrS4 that was built in 03/92. He too had an ECU with socketed chips under those plastic clips. His ECU had a 1.267.357.248 chip (the other one looks like it was 1.267.357.249 but I am uncertain about that).

So your chips are probably correct for the era and the situation, i.e. the factory socketed chip set. At some point Audi must have felt confident enough about the software and decided that they didn't need the sockets for potential factory/warranty upgrades/replacements and just had the chips soldered directly to the PCB from then on to the end in 1997.

[hunker7]

Thanks. I will sort the running issues out first before spending on chips, maybe the bad fuel economy is down to the running issues

[UrS4boy]

Thanks. I will sort the running issues out first before spending on chips, maybe the bad fuel economy is down to the running issues

When you get the grey UrS4 avant running, put the ECU from the red avant in it and compare how well (or not) it runs things in that chassis. Could be further proof that the red avant's issues have nothing to do with the ECU or its chips.

[geneandbolly]

i can't wait to hear more about this grey car (no offence to your red one!) - i wanted to buy it around two years ago but was sold by the time i got my RS in gear . .

[hunker7]

i can't wait to hear more about this grey car (no offence to your red one!) - i wanted to buy it around two years ago but was sold by the time i got my RS in gear . .

Got a separate thread for the grey one

Wish I could justify keeping both

[hunker7]

This with a nice 1.8T under the hood, 2,2T would be too big i reckon.

http://www.carandclassic.co.uk/car/C589476#

[hunker7]

I was wondering, is there a way of testing the rear top mounts without disassembling the strut? sometimes it feels like they are fine, but sometimes it seems like they are completely gone.

Could it be something else, I get a really harsh knock when going over bumps and stuff?

[hunker7]

Unfortunately this will be going up for sale in next couple of days as I've decided to keep the grey S4 as it seems a more solid car. It will be on 16" avus with quattro script interior. Will post full thread soon!

[Majorcina]

Not leaving it to your father?