hacker-pschorr

Damn it John.

I talked myself into the 3rd party system for my 79's conversion to EFI vs. the EuroS system (eventhough I already have everything for the EuroS conversion thanks to you and TurboX).

With a shark tuner available I have to rethink all of this again.

FlyingDog

If it's like VWs, you can't switch while running. I think they work by storing all the maps seperately, then reprogramming the 'primary map' (my wording) when you want to switch. Basicly, you could have 7 maps stored in 2-8 and each time you wanted to switch you'd copy and paste.

John Speake

Hmmm, I packed up early yesterday, so will try and answer some of the points raised. above.

For the Euro 16v M21/22, for MY 84 the LH ECU fitted was the 928 618 123 00. This is the one that is substantially different to the later 02 fitted to MY 85/86.

I have not had time to look at converting one of these units to the later type, although this may be feasible.

It may also be possible to use a US LH in a Euro with suitable Euro EPROM, I haven't checked this out.
The later 02 (Euro) and 03/04/05 (US) do look pretty compatable.

The problem with adding support for 42# injectors is that the controller in the LH and EZF can only address a 2732 EPROM (4kB). Most of that 4k is already used.

Vilhuer

M154 option is low compression 16V ROW engine which is basically same as 10.4:1 normal 310 hp version except that it has 9.3:1 pistons. Its rated at DIN 275 hp @ 5750 rpm while full 310 hp comes @ 5900 rpm. Maybe this map is more conservative than 928 618 124 03 and could be used in SC applications?

1986 M28.45/46 was available at least in Germany (FGR) and Austria but it wasn't full ROW model AFAIK.

Scott M.

Sorry to drift off JS's original topic, but...

Errka; I spoke with a gentleman Saturday who claims to have an 86 Euro with a 16v motor here in the States (an only 10k miles), is the M28.45/46 number what I should look for in such an animal? Would there be any other features that were unique to those cars? I assume S4 calipers, ABS etc were standard.

John Speake

Hello Scott,
A Euro 16v would be M21/22 with the "normal" high compression engine. The low compression 16v engine, sold in Switzerland and Sweden doesm't appear to have a special engine code, but one of those countries should show up in the option code list.

For MY 86 there was also a lower compression version of the early 32v motor sold in Europe M45/46. These are quite rare.

Try to get the engine number, and option codes from that car...

Tom. M

Bob V had an early 86 with the aussie M45 32 valve motor...(lower CR) a while back..in Vancouver BC...was the cover girl for the first issue of "928 Forum". Beautiful car..had all the S4 goodies..no sunroof and some other subtle differences like a different rear muffler etc... Don't think it could have made it into the states since it was not federalized..but stranger things have happened...

later,
Tom
89GT

Vilhuer

Scott, as John says. Look for both engine number and option codes. Low compression '85-86 16V is M151 regardless of gearbox type and '86 ROW 32V is M298 or M299 depending on if its 5-speed or automatic.

So its M151 what I was thinking of in previous message, not M154. M154 is not listed in '83-86 MY ROW PDF PET explanation list even though it is shown in connection with ...04 EZ-F box. It is listed in most comprehensive option list I know of as 154 Control unit for improved emissions. M151 and M154 might not be related after all but M151 engine was done to lower emissions AFAIK.

Scott M.

JS;

Going by what Errka typed, it appeared that the 1986 low compression 16v motor was a M28.45/46 maybe I am not reading correctly. Am well aware of the 'early' high comp. 16v's being M28.21/222's.

I'm aware of Bob V's (from the old Mag) and an 86 Canadian car here in Pa with the 32v's motors. Never heard of one with a 16v though. The owner wants to bring it by my place for a going over so I'm anxious to get my paws on it.

PorKen

According to the '86 Service Bulletin, between the 43/44 (US) and 45/46 (M298/299), the LH is the same, rev. 04, but the EZF is rev. 05 for US, versus 06 for the low compression engine.

John Speake

Hi Scott,
No, the M28/45/46 low octane version of the 32v was the Australian standard engine (thanks Tom for reminding me of that) and was also available as an option in Europe (lower road tax, because it was cat equipped, whereas 16v were cat-less)

M 28 43/44 was the higher comp version which was standard for US, Canada and Japan.

It appears that for 16v, high and low comp M28 31/32 were only differentiated by Swiss or Swedish market codes.

John Speake

That's quite logical, fuel requirements are the same, but ignition map is changed according to compression and emissions requirements.

Vilhuer

Lets take it one more time. AFAIK these are all possible ROW engine and gearbox combinations in '84-86 timeframe (except see below for possible optional automatics). All hp and tq numbers are in DIN. Converted to US SAE hp numbers would be 306, 272 (or 271) and 284 hp.

M151 engine use close to similar pistons as '83-84 M28/19 and M28/20 US engines. M298 and M299 use close to similar pistons as '85-86 M28/43 and M28/44 US engines. In both of these cases engines are in all other respects same as more common same MY versions. Both type pistons have more material removed at top center for higher cc number.

Its possible there were optional diff ratio for automatic available in some of these years also. These gearboxes would be A28/03 ('84 MY) and A28/06 ('85 and possibly '86 MY) then.

So there are at least 9 and possibly 11 (or even more) ROW engine + gearbox combinations for this brief three year period. No wonder Porsche wanted to rationalize production when they started making S4. And above list doesn't even mention first 596 M28/21 and 1113 M28/22 '84 MY engines which used earlier style larger cc pistons which were used in '80-83 M28/11 and M28/12 engines.

Scott M.

Great info.

Thanks JS and Errka.

PorKen

Here are the LH2.2 03 and 04 revision boards. The 04 seems to have fewer components.


click to supersize