Engine flat spot

[kiwi 2-11]

Help...My 2-11 has a developed a flat spot between 3-4000 rpm. The engine has a "miss" akin to an F1 car entering the pits (thats the only way I can describe it). When the engine is missing ,my T/C light on the dash is flashing!!!.

If I engage the T/C the miss disappears.

I have recently upgraded the ECU to the lastest 260hp hoping this would fix the problem, but its still there.

Does anybody know what could be causing this?

Edited November 11, 2009 by kiwi 2-11

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Just to be sure - you enable the tc the problem goes away?

I could see how it could happen with the tc on:

- what's the state of the rear tyres?

- wonder if the wheel sensors are ok - abs all working ok?

[kiwi 2-11]

Just to be sure - you enable the tc the problem goes away?

I could see how it could happen with the tc on:

- what's the state of the rear tyres?

- wonder if the wheel sensors are ok - abs all working ok?

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Yes, the problem completely disappears when the TC is on. The rear tyres are brand new, and the wheel sensors appear to be working OK, I suppose, how would I know?...the abs is working fine.

Paul

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That's really odd - the tc system shouldn't even be on...

Hmm - I think you'll have to get onto lotus motorsport guys to see what in the software can flash the tc light under power.

When you have tcdisabled do you have the variable control knob fully clockwise/off so the tc light is on in the dash?

[kiwi 2-11]

That's really odd - the tc system shouldn't even be on...

Hmm - I think you'll have to get onto lotus motorsport guys to see what in the software can flash the tc light under power.

When you have tcdisabled do you have the variable control knob fully clockwise/off so the tc light is on in the dash?

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I have raised this issue with Russel, and I also flicked a note to Nick Adams (no response).

Yes, when the T/C is disabled the knob is fully clockwise.

The car is not nice to drive unless the T/C is fully off, the flat spot is so bad its like driving an old turbo car with lag.

Paul

[Bibs]

Nick's off work at the moment, should be back soon.