Jump to content


Getting Comfortable
  • Content Count

  • Joined

  • Last visited

Community Reputation

5 Neutral

About Belle400

  • Rank
  1. Thanks both, I will do some testing over the next few days and report back.
  2. Thanks, will give it a go. Current cranking table looks like this, i thought it was a little high but maybe it needs more. I have seen some other examples as high as 500% though.
  3. Thanks. Im using slightly different Injectors, Bosch red type but the cc value should be right. Ve table is a generated one with a few good Autotune runs, car seems to run reasonably well on it. idles around 13.8 Afr, 47 Kph map.
  4. Im trying to tweak my cold starts a little and wondered what sort of values i should see in the priming pulse table. My engine turns over for about 3-4 seconds before bursting into life which may be a little long. Do these look ok? MS2,Tvr 3.9 engine.
  5. Thanks, I’m inclined to leave it alone if it looks reasonable. I will get it on a dyno in the new year as I think it’s the best approach and it will stop me constantly fiddling!
  6. Hi Guys Id like some help with a base ignition map, ive posted up what i currently have which is a guess and not dyno tuned. I plan to dyno tune it next year after the christmas period. Its in a light Tvr so maybe a Range Rover map etc isnt that suitable, although i doubt they are much different. Im running Speed Density. This is one ive found that looked good but im having a hard time trying to understand how to turn it into a Map based one. https://forums.lr4x4.com/topic/84065-rover-v8-39-ignition-map/ Any tips are much appreciated, car likes to idle around 14 degrees and from what ive read needs 32 degrees max. Im idling at around 45 Kpa. I used to run it at 18 degrees idle on the old 14cux and to be honest the car loved it and throttle response was great, i used the full manifold vacuum method as the ported method was very erratic.(a popular Tvr modification) I will post up my current igniton map below. car has the 3.9 engine with nice heads, cam and intake work. Thanks in advance.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy