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Aug 13, 2023 16:22:59 GMT |
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OK, had a bit of time on it this afternoon.
I checked the MAP sensor and with a suck it registered on the gauge in TunerStudio. However it shows little movement when connected to the manifold and the engine is turned over. I checked for any possible blockage but all was clear.
I tried reducing the values in the VE table and did get it to run for a bit longer and the pulse width did seem to be coming down but the wideband readings were not consistent (not surprising given how rich it is)
The lack of any real MAP reading would seem to be the issue but I cannot see why I get no reading when I know it works. The cam timing was checked twice (I'm not sure even if it was wrong there would be zero vacuum) and the engine has good compression.
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Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup
1953 Pop build (wifey's BIVA build).
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Aug 13, 2023 18:42:13 GMT |
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I wouldn’t expect to see much/any vacuum when cranking.
The running range does depend somewhat on the engine characteristics (especially cam) but will typically be between 100 (full throttle) and about 30kPa at very light cruise and a bit less still on the over-run. Idle usually between about 45 and 70, the wilder the cam the higher the number. The point you take the vacuum from can also be a factor. Some ports on throttle bodies don’t give true vacuum.
Also, quite alot of the Ford regulators are 3.8 Bar so if you’ve put flow figures in based on 3 Bar you’ll be over-fuelling. Should be stamped on it but a gauge tells what is actually happening!
BTW, you can lean/richen the whole table by changing the “required fuel” number. Smaller number gives less fuel.
What VE table are you actually using? I first got my Vitesse running on the MS default table which was for a small block Chevy!
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Last Edit: Aug 13, 2023 18:48:43 GMT by vitesseefi
1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Aug 13, 2023 18:59:07 GMT |
Thanks again vitesseefiIt's an inlet plenum setup and the vacuum take off is from that. Cams are stock, the only engine mods are a clean up of the head (ports etc) and a decent exhaust manifold. Fuel pressure for these is listed as 2.5 bar but it's a vacuum referenced regulator, I believe 3 bar is the maximum. It's the long injector pulse width that puzzles me, I just can't seem to find a reason. I have tried reducing the required fuel but it didn't help, I still had a large pulse width. The VE table was from one of the sample projects in TunerStudio, it looks similar to other 2 litre maps I have found online. |
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Last Edit: Aug 13, 2023 19:03:00 GMT by crockpot
Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup
1953 Pop build (wifey's BIVA build).
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Aug 13, 2023 19:00:33 GMT |
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I'd check you have a clean vacuum take off and nothing's blocked on the manifold.
If it's not seeing the manifold signal it will think you are at wide open trottle and dump loads of fuel in .
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Last Edit: Aug 13, 2023 19:03:01 GMT by kevins
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Aug 13, 2023 19:05:20 GMT |
Done that kevins found nothing but I am going to recheck along with going over previous checks eg timing etc. Thanks for the reply. |
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Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup
1953 Pop build (wifey's BIVA build).
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Aug 15, 2023 13:22:22 GMT |
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All sorted!
Basically, if you think you have worked out the trigger wheel tooth angle, double check it and also make more effort to see if the information is available elsewhere.
I had the setting at 110 degrees, it should have been 80 degrees (turns out lots of Ford 4 cylinder engines use this value) so the timing was 30 deg retarded! No wonder it wasn't happy.
Reset it to the correct figure and it started and settled down to a slightly fast (and rich) tickover. Quick blip of the throttle and it revs very nicely, nice sounding exhaust too. Not too loud but a nice growl.
Happy days.
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Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup
1953 Pop build (wifey's BIVA build).
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Aug 15, 2023 18:39:02 GMT |
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I've just re-read the first page of this thread and noticed that I said that I was certain that 80 deg was correct for the trigger wheel offset. I have no idea where the 110 degrees came from.
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Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup
1953 Pop build (wifey's BIVA build).
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Aug 15, 2023 20:56:44 GMT |
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Well done. I wouldn’t have guessed that as the cause of your problems.
You can have fun tuning it now 🙂
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Aug 27, 2023 11:00:52 GMT |
I thought I would keep this thread going as it may be of some use to anyone thinking of using Microsquirt and TunerStudio. I now have the engine ticking over nicely at a very steady 790rpm with an afr of 12.4:1. This was another steep learning curve but I have found this Youtube channel to have some really useful hints and tips on getting a basic setup established www.youtube.com/@turbineresearch/videosAnother thing that helped was establishing what the IAV was doing. I'm using a Bosch 2 wire IAV (a common choice) which has a rotating segment that passes over an opening giving a variable air bleed for starting and idle. It is PWM control and I had no idea how the Microsquirt output related to its opening %. I took it off and ran through the % output to establish a relationship. The off position is actually a small opening, fully closed requires a % input. In this case my valve was fully shut at 33% and fully open at 68%. This was hugely helpful in setting the idle and start/warmup as otherwise you are making stabs in the dark. Sorry for the long waffle. If anybody is interested I post other stuff up as I learn although that will be a bit in the future now. |
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Last Edit: Aug 27, 2023 11:02:11 GMT by crockpot
Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup
1953 Pop build (wifey's BIVA build).
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Darkspeed
Club Retro Rides Member
Posts: 4,471
Club RR Member Number: 39
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TunerStudio and MicrosquirtDarkspeed
@darkspeed
Club Retro Rides Member 39
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Aug 27, 2023 20:10:26 GMT |
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Count me as an interested party - I have an old OMEX in a box to do something with, and two MS that I should have fitted years ago - delays to projects have meant zero progress.
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Sept 27, 2023 21:57:56 GMT |
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I'm interested too, I think I'm going to go Speeduino, but it'll be tuner studio to set it up, and I'm sure alot of the info is similar.
Well done for getting it this far👏
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Sept 28, 2023 0:56:15 GMT |
I'm interested too, I think I'm going to go Speeduino, but it'll be tuner studio to set it up, and I'm sure alot of the info is similar. Well done for getting it this far👏 Thanks. We are still in the States at the moment so it will be a while before I get back on it. Speeduino uses TunerStudio so a lot will be relevant. Whether anything I do will be relevant is another thing altogether. |
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Last Edit: Sept 28, 2023 0:57:09 GMT by crockpot
Proton Jumbuck-deceased :-(
2005 Kia Sorento the parts hauling heap
V8 Humber Hawk
1948 Standard12 pickup
1953 Pop build (wifey's BIVA build).
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LIKE 
