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Getting Comfortable
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About Belle400

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  1. Im still on the original Rover valve. I would expect the graph to start near 200 steps and gradually decay down to roughly 25 steps if all was working correctly.
  2. What I'm trying to work out is why my stepper graph is as below. I have verified on the can test section that 200 steps is fully open and its working the right way. Base idle screw on the 14 cux was wound out about 2 and 1/2 turns to achieve 600 rpm. If I try to achieve 600 rpm base idle on the Megasquirt I'm out about 5 turns. Seems a lot but maybe it's what it needs.
  3. OK thanks, I wasn't sure if the throttle stop screw was adjusted before the bypass screw. I'm guessing the throttle butterfly needs to be closed as the idle valve controls the air. Procedure for setting base idle on the 14cux was engine warm, clamp/plug bypass hose and set to 600 rpm.
  4. Hi All, Ive just finished an Ms2 conversion to a 3.9 Tvr Chimaera (be gentle with me!) Car has been road mapped too. I thought id ask here as you lot seem the most knowledgeable on Megasquirt. Im trying to fine tune my cold start, my question relates to the plenum butterfly. How do you set the butterfly to start off with, ive read it needs to be fully closed and also it needs to be set to bring idle to 800 rpm ish. Not sure on this one. I have the standard RR 14cux plenum fitted, all be it an enlarged one. I have the throttle stop screw accessible from the top. Engine uses the standard 4 wire stepper. Any pointers are much appreciated.
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