Chimaera idle speed
Discussion
You realise many owners would be happy to have a stable idle speed around 950 rpm? it becomes an issue for many, including myself in the past. 
Faulty stepper motor or components in the ignition system all contribute to issues.
But anyway, it is controlled by the ECU. So it can't be altered unless you change the ECU I'd have thought. Unless anyone knows differently?
Faulty stepper motor or components in the ignition system all contribute to issues.But anyway, it is controlled by the ECU. So it can't be altered unless you change the ECU I'd have thought. Unless anyone knows differently?
I think big cam = higher tickover due to bad wear rates and possible hunting which is actually normal for big big cam use but not what customers of Tvr were after as they were wanting a more sophisticated ride 
Cam timing especially advanced is limited using a distributor system.
You can indeed get a tickover down to about 750 using after market ecu and coil packs or maybe a modern 123 dizzy and clever use of advanced ignition timing which makes pulling off a dream as even on tickover I can move my car around with zero throttle inputs but more difficult using the CUX and old stepper system as it’s only just reliable at 900 revs.
Times have changed so regular use is far less likely so having after market is a luxury but done well it’s well worth it for an engine that runs almost like a very modern unit and mine responded marvellously to an ecu change.
Not much faster top end but useable power everywhere and more of it and so smooth to drive but that’s on a 4.6 on smaller induction pipes so a 5.0 should respond slightly better bhp wise I’d expect
Cam timing especially advanced is limited using a distributor system.
You can indeed get a tickover down to about 750 using after market ecu and coil packs or maybe a modern 123 dizzy and clever use of advanced ignition timing which makes pulling off a dream as even on tickover I can move my car around with zero throttle inputs but more difficult using the CUX and old stepper system as it’s only just reliable at 900 revs.
Times have changed so regular use is far less likely so having after market is a luxury but done well it’s well worth it for an engine that runs almost like a very modern unit and mine responded marvellously to an ecu change.
Not much faster top end but useable power everywhere and more of it and so smooth to drive but that’s on a 4.6 on smaller induction pipes so a 5.0 should respond slightly better bhp wise I’d expect
Roverguage will tell you what the target RPM is written into the Eprom and it can be changed quite easily with a quick reprogram of the chip. It's very unlikely however unless some 14cux meddler has been in there already that it will have been changed. It's far more likely the base idle screw is too far up and letting in too much air. It's the hex screw next to the throttle plate area on the top of the plenum. Try winding it down a turn?
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