Rev range

[alangorst]

Hi there as some of you may know I prevent ly purchased a e30 with a m52b28 in it. My question is why does it hit the limiter at 5700 revs as this seems to be pretty low. What way will I Beable to change this? Would I need to chip the ecu?

Cheers alan

[kam-325i]

At the Rev limit, Does it........

A, Bounce Regular

B, Stay Stable @ 5700

C, Splutter

[alangorst]

it stays stable buddy

[kam-325i]

Has it got a standard ECU fitted ?

[Rancid]

Does the m52b28 have a "limp home" mode that could be causing that?

[kam-325i]

Does the m52b28 have a "limp home" mode that could be causing that?

Most "limp home" modes limit to around 3000rpm.

[leeparkes]

M52 limp mode is around 5.5K.

[ajay]

Sounds like your ecu is not reciving a road speed signal, the effect is the exact symptoms you describe. Def worth checking, i forget the exact pin/ cable but im sure some on here could help.

[kam-325i]

M52 limp mode is around 5.5K.

Really ???

[alangorst]

would the road speed signal be received from the front left hub by any chance? as ive got the front suspension in pieces the now and there is a cable there but it wasnt attached to anything :/ and didnt seem to have any where to plug into

[alangorst]

Has it got a standard ECU fitted ?

yeah its the standard seimens ecu as far as i know

[ajay]

Best bet is to get the fault codes read and see what comes up and take it from there.

[alangorst]

Okay thanks for the help on this lads....does anyone know of anyone one on here based in Scotland that knows a good bit on the m52b28 conversions that I could to look the car over when I have it on road to check all is correct with it?

Cheers