Hi Zach,

Agreed on the turbo/non-turbo incompatibility, although I couldn't say for certain you would not be able to start and maybe even drive a car with such a swap -- leading to the compatibility claims.

I never get too far looking over this chart because the reference to "LH 2.1" gets me hung up every time. I'm quite sure there's no such animal on a 240, but I see a lot of mention on TB implying it was a real Bosch number used on early 740 turbos. However, those same folk insist on designating various ignition systems with "LH" numbers, so I don't give much credence to the talk. In any event, I don't believe the -016 AMM was invented back then, and question whether a -510 ECU would be anything other than LH2.0. Some rumor said the 84.9 LH2.0 with the HO2S was LH2.1, but I don't believe it.

My opinion on the "pink label" reputation is well known on this board: Having a pink label only means the fuel pump relay driver is likely to fail totally and completely. All the other foibles attributed to these ECUs are unrelated to the label color, but may exhibit some correlation due to the age differences.

The move from 556/561 to 933/951 in LH2.4 NA cars eliminated the cold start valve, so the backward compatible 9xx series used 92/93 where no CSV is installed should not be replaced with a 5xx ECU, however maybe in Florida they work just fine.

--
Art Benstein near Baltimore

A bicycle can't stand alone because it is two-tired.