Belle400 Posted December 7, 2019 Share Posted December 7, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
lo-fi Posted December 8, 2019 Share Posted December 8, 2019 You may find that it's actually the "cranking pulsewidth" table that you want to change. Or you may find that your req_fuel setting is off, and it's actually this that wants sorting along with your fuel table. The cranking pulsewidth is calculated from req_fuel, so if that's out so will the cranking values. Its quite common to have an engine running perfectly well with req_fuel completely out of whack with correspondingly whacky figures in the fuel table to compensate. Post your fuel table and we'll soon be able to tell if I'm on the right lines Quote Link to comment Share on other sites More sharing options...
Belle400 Posted December 8, 2019 Author Share Posted December 8, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
lo-fi Posted December 8, 2019 Share Posted December 8, 2019 Looks pretty good Try modifying the cranking pulsewidth table, give it a little more juice. IIRC, it's set up as a percentage of req_fuel against coolant temp. 1 Quote Link to comment Share on other sites More sharing options...
Belle400 Posted December 8, 2019 Author Share Posted December 8, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted December 8, 2019 Share Posted December 8, 2019 I'd second the cranking pulsewidth as your 1st port of call, assuming the regular map is good once it's fired up. Quote Link to comment Share on other sites More sharing options...
Belle400 Posted December 8, 2019 Author Share Posted December 8, 2019 Thanks both, I will do some testing over the next few days and report back. 1 Quote Link to comment Share on other sites More sharing options...
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