Crockpot
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| posted on 10/2/26 at 05:12 PM |
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Using VE analyse in TunerStudio
I am at the point of starting to get my project driving. The current fuel mapping in Microsquirt is now at the point
where it starts and runs but applying throttle it stumbles. Can I use VE analyse to get the stationary running when revving up
better, or is it's use confined to driving? There's been no initial map, I've started from scratch.
The engine is a Ford Granada I4 8v, completely rebuilt, tubular exhaust manifold, cleaned up head and the distributor
has been deleted and replaced with a lost spark coil pack. No comments about the engine choice, the project has been rather long term
and it's meant to be a reliable and economical cruiser for wifey (it's in a Ford Pop).
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scudderfish
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| posted on 11/2/26 at 04:48 PM |
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You can, but it's really better for polishing a tune rather than sorting out fundamentals. Your engine needs to be running for it to be able to
take readings over a period of time. When you say it stumbles, does it cut out? Can you increase engine speed if you add throttle really slowly?
email me some MLG log files at dave@smithfamily.org.uk and I'll see if I can see anything obvious. Log the engine starting, idling for about 30
seconds and then various attempts to get it to run faster.
Regards,
David
P.S. Full disclosure, I'm developing my own tuning software for Speeduino/Megasquirt ECUs 
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Crockpot
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| posted on 13/2/26 at 03:37 PM |
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Thanks for the reply. Also sorry for the late reply, been away for a couple of days.
It will be a week or so before I get back onto sorting the engine out.
I may well take you up on your offer if I find myself struggling.
Cheers,
Paul
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scudderfish
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| posted on 13/2/26 at 06:24 PM |
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No worries, I'm after examples of MLG log files anyway for testing my software. If I can help someone out at the same time that's a win/win
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coyoteboy
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| posted on 17/2/26 at 11:47 AM |
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As mentioned, you really need to have a passable map because misfires really mess with the feedback - lean or rich misfires are read the same way.
But having a passable map is quite easy on a NA engine, they're usually pretty accepting of a wide operating range - to get mine running I just
used the wideband feedback to get the unloaded rows close to stoic, then extrapolated by intuition to get the off-boost areas drivable (but awful).
From there, autotune got it a lot closer. However, your timing map is far more important, mainly because a 5 degree timing change can make a 14:1 AFR
change to 16:1 if you were miles off ideal.
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Crockpot
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| posted on 22/2/26 at 12:00 PM |
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Thanks Coyoteboy, that was pretty much going to be my strategy.
The timing is a bit of an issue as I have been unable to find an ignition map for this engine.
I have used a zetec one but even at that I'm not sure if it was for a modified or stock plus it's still not really an equivalent.
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Crockpot
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 posted on 23/2/26 at 04:11 PM |
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Started it up today to make a start. It hasn't been started in about 18 months and started pretty much instantly.
The idle hunts, revving up and dying back. Quickly applying throttle stalls it but steady application and it revs fine.
Also once it is revving a bit it will take quick throttle application fine. I had to abandon it when I had a big water leak.
Turns out that there is no point buying top quality hose clamps if you don't tighten them :-(
[Edited on 23/2/26 by Crockpot]
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gremlin1234
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| posted on 23/2/26 at 04:45 PM |
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quote:
Originally posted by CrockpotTurns out that there is no point buying top quality hose clamps if you don't tighten them :-(
I think the word is damn
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scudderfish
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| posted on 23/2/26 at 06:32 PM |
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quote:
Originally posted by gremlin1234
quote:
Originally posted by CrockpotTurns out that there is no point buying top quality hose clamps if you don't tighten them :-(
I think the word is damn
Hopefully it wasn't a big enough water leak to need one of those!
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scudderfish
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| posted on 23/2/26 at 07:46 PM |
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quote:
Originally posted by Crockpot
Quickly applying throttle stalls it but steady application and it revs fine.
Probably Accel enrichment not keeping up, engine goes lean and dies. Send me some MLG log files.
dave@smithfamily.org.uk
Regards,
David
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Crockpot
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| posted on 25/2/26 at 09:56 AM |
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Thanks again for the offer David.
No offence but I would like to do as much as possible myself first off, I like to learn the hows and whys of things.
I had another play yesterday. Without any changes the idle has now settled down, no idea why at the moment.
I have one last small coolant leak to deal with (there's a few home machined components in the cooling system, it was always on the cards).
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scudderfish
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| posted on 26/2/26 at 08:24 AM |
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No worries, fully understand. Can you still send me MLG log files though please as I need them for my own purposes 
Regards,
David
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Crockpot
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| posted on 27/2/26 at 03:53 PM |
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I've had some more time playing with it and learned all about tps.dot% settings.
Turned out it wasn't going lean as I thought, it was drowning! Injector pulsewidth at tickover is around 2.1ms, blipping
the throttle was taking it to 46+ms! having watched a YouTube vid on setting accel enrichment I have got it to pick up well.
Holding the revs steady at various speeds showed it was lean just off idle and up a bit. I got these to stoich or just a touch richer.
It was a noticeable improvement.
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scudderfish
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| posted on 27/2/26 at 05:03 PM |
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Good stuff!
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