e30 tach with s50 engine

[Rev Engineer]

Stock s50 redline is 7200 in 1st gear, but otherwise 6500. Conforti chip redline is 7000rpm (I assume it allows 7200 in 1st?). I think the dme uses the road speed signal to control the 1st gear rev limit.

I'm using the stock e30 m3 cluster in my conversion. I'm working on a converter to down convert the tach signal from 6 cyl to 4. I actually just got to test it out today and it's working great off idle, but the tach jumps around at idle. I probbaly need to tweak the software or cirucit and it should be working better. If there is any interest in this, I can post some more details and/or offer to sell a few circuit boards once I get it tweaked a little better.

[TWRViper]

Are the 318i code plugs interchangible with the e30 m3 code plugs?

[TWRViper]

what is the revlimiter on the s50? stock and chipped? (probably depends on the chip, but it would give me a ballpark of what to look for)

[TWRViper]

Anyone do a swap to a e30 m3 cluster? Did you have to swap code plugs and tach faces?

[1990m3]

don't know about stock but with my conforti chip the redline is 7000RPM. I have a 318is with a 6-cylinder coding plug and the tach is accurate.

Good luck

[TWRViper]

Hey guys,

I need some input. I bought e30 325 with a s50 swap from a 1995 m3. However, the instrument cluster is from a e30 m3 (it says m3, and has the oil temp instead of the mpg), but the tach face (paper markings) looks like it is from an 325i since it goes to 7000 with a redline at 6500.

When i got the car it had a 4 cyl code plug so the tach would go much higher than redline. I swapped to a 325i 6 cyl code plug and it works much better.... However, the revlimiter is set between "6500" and "6700," depending on the gear, according to my current tach setup.

The car might have been chipped. What should be the stock and chipped redline and revlimiter for an s50? Somehow I got the impression it was 7000/7200rpm?

Does it sound like my tech is reading too low? Do I need to get the m3 8k tach faceplate to replace my 7k faceplate?

Thanks
Tom