setting up my throtle pots

[Jooles81]

Thanks, this confirms what I thought : a badly setup car will run fine at low rpms because the ecu will compensate, but will run poorly at high rpms because it will not compensate any more. That's a strange decision to setup the car this way from tvr!

I still don't have the answer to one question (I'm stubborn, am I?):is it normal that the adaptatives go high at lift off, when they are usually pretty low?

Julien

[Jabbah]

One of the important reasons to make sure you have set up your TPSs so that the adaptives are between 0 and -10 (ie running slightly rich) is so that when you hit the open loop areas of the map the correct cells are used and the engine doesn't run lean under load. If the ECU thinks the throttle is more closed than it actually is then it will under fuel in open loop too potentially causing knocking.

[Jabbah]

Jooles81 said:

I still don't have the answer to one question (I'm stubborn, am I?):is it normal that the adaptatives go high at lift off, when they are usually pretty low?

I have noticed this when I supercharged my MX5 and replaced the ECU, on lift off the fuel and spark were cut leading the wideband to see a very lean condition and change the equivalent of the adaptives to increase fuelling. I expect the same is happening here as spark is cut and fuelling is altered (although some is left for the pops and bangs ). The adaptive calculation will always be running though so will see the lean condition and increase the expected fuelling until throttle is applied again restarting the spark. So yes, this is normal.

[Englishman]

Jooles81 said:

I still don't have the answer to one question (I'm stubborn, am I?):is it normal that the adaptatives go high at lift off, when they are usually pretty low?

Julien

Not sure if TVR ECU's actually cut the spark on overrun, but my S6 Cerb certainly behaves in the same way as your V8.

[Jooles81]

Thanks again for those answers. It confirms what I thought, which is fine. I will set the car on the rich side, and don't worry any more on the high adaptatives on liftoff. I fully understand why it should be setup rich on open loop and will do so.

Thanks again.

Julien