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UK Luke 72
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Joined: September 07, 2011
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Location: Little Britain
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 Posted: Thu May 14, 2020 1:29 am Post subject: Re: Megasquirt my 2276 |
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Yeah I can, I was just pointing out to John that seeing as I have no vac signal hooked up, the engine has no idea if we're overrunning. Also the fuel cut isn't enabled. So I expected it to still hold the target AFRs... Odd one, at no other point did it do that .
I've made a crude little vac manifold up anyway so I can run it in speed density if I get a useable vac signal.
I feel like it may need to be a bit bigger volume but we'll see.
Does it matter how much vac it pulls?
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UK Luke 72
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clonebug
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| Posted: Thu May 14, 2020 2:50 pm Post subject: Re: Megasquirt my 2276 |
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60 kpa is fine for idle.... I barely get that.
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My Megasquirt Fuel Injection Turbo Buggy Build
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UK Luke 72
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Location: Little Britain
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UK Luke 72
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gprudenciop
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Joined: July 06, 2008
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Location: portland or
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| Posted: Thu Jun 04, 2020 5:20 pm Post subject: Re: Megasquirt my 2276 |
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If you want to email me your tune and a data log,I will check it out. [email protected]
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UK Luke 72
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gprudenciop
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Joined: July 06, 2008
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Location: portland or
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| Posted: Fri Jun 05, 2020 9:06 pm Post subject: Re: Megasquirt my 2276 |
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Starting to dig thru your log and you are at 17 degrees spark advance at 100 map! You have enough of a vacuum signal to run speed density......you are also going very lean with part throttle...
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UK Luke 72
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gprudenciop
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Location: portland or
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| Posted: Sun Jun 07, 2020 8:15 pm Post subject: Re: Megasquirt my 2276 |
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for some reason your tune didnt allow me to change your accel enrich so you will have to set it. your min tps dot was under 20 and you had it activating at 200, so it wasnt adding fuel during part throttle. those are your lean spikes. also if your tune isnt set you dont want ego control active cause it just causes more issues.
for auto tune this is what i do.
1. turn off ego control
2. set auto tune to easy
3. turn accel enrich off (give it a high activation number)
4. give your mat air density table all 100's
5. when auto tuning dont change elevations
6. remember the mat for the day you are tuning.
now whatever the weather you are tuning in, that is going to be 100 in the air density table. so the next day when it is colder or hotter instead of changing your tune you will add or remove to the air density table on that temp.
example : you tuned yesterday at 80 degrees(100 density table) today its 95 and it is running lean you would add to the density table till it was good again without retuning.. it may look like 102 density table at 95..repeat for all temps.
forgot to add that you want to roll in to the throttle try not to mash on it till the tune is close. than turn on your accel enrich and change auto tune to normal...
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UK Luke 72
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| Posted: Mon Jun 08, 2020 3:38 am Post subject: Re: Megasquirt my 2276 |
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Thanks for the tune!
I did what you listed, went for a 30 minute drive. No mashing the throttle.
Not sure I fully understand why the MAT needs fudging like that, guess it's to prevent the autotune from correcting itself for variations in temp and chasing it's tail?
Today was average 68ºF MAT set to 100
Driving it seemed to swing heavily from 8.8 afr to 22 and popping.
I tried fixing a couple of cells at really low vac ~35kPa with a higher VE which worked to keep the overun richer but unlocked them again to let the software do it's thing.
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gprudenciop
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Joined: July 06, 2008
Posts: 606
Location: portland or
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| Posted: Mon Jun 08, 2020 7:34 am Post subject: Re: Megasquirt my 2276 |
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| UK Luke 72 wrote: |
Not sure I fully understand why the MAT needs fudging like that, guess it's to prevent the autotune from correcting itself for variations in temp and chasing it's tail?
Today was average 68ºF MAT set to 100
Driving it seemed to swing heavily from 8.8 afr to 22 and popping.
I tried fixing a couple of cells at really low vac ~35kPa with a higher VE which worked to keep the overun richer but unlocked them again to let the software do it's thing. |
it seems the ideal gas law isnt ideal for every engine. you can have two identical engines and they will need different timing and fueling.you are basically giving your engine what it wants and will avoid auto tuning all the time. i just worked on a guys mustang that would auto tune 3 or four times when he would cruise around for the day.....
if your fueling is way out auto tune will only allow so much change before it stops fixing it. easy way to fix is shut down tunerstudio and restart auto tune (what i do) or change auto tune authority limits.i can see that happened on your tune.....
the tune you sent me looks better and we can start fixing some of the cruise timing and fueling. we also need to drop 5 on the kpa map becouse you are hitting over run sometimes (popping)......
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UK Luke 72
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Location: Little Britain
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| Posted: Mon Jun 08, 2020 1:20 pm Post subject: Re: Megasquirt my 2276 |
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| gprudenciop wrote: |
| UK Luke 72 wrote: |
Not sure I fully understand why the MAT needs fudging like that, guess it's to prevent the autotune from correcting itself for variations in temp and chasing it's tail?
Today was average 68ºF MAT set to 100
Driving it seemed to swing heavily from 8.8 afr to 22 and popping.
I tried fixing a couple of cells at really low vac ~35kPa with a higher VE which worked to keep the overun richer but unlocked them again to let the software do it's thing. |
it seems the ideal gas law isnt ideal for every engine. you can have two identical engines and they will need different timing and fueling.you are basically giving your engine what it wants and will avoid auto tuning all the time. i just worked on a guys mustang that would auto tune 3 or four times when he would cruise around for the day.....
if your fueling is way out auto tune will only allow so much change before it stops fixing it. easy way to fix is shut down tunerstudio and restart auto tune (what i do) or change auto tune authority limits.i can see that happened on your tune.....
the tune you sent me looks better and we can start fixing some of the cruise timing and fueling. we also need to drop 5 on the kpa map becouse you are hitting over run sometimes (popping)...... |
I checked overuun fuel cut, should that be switch on?
For the mileage I do I'd be happier I think if overun was 15-16:1 or so.
Why does the autotune not hit target AFRs in those parts?
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gprudenciop
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Joined: July 06, 2008
Posts: 606
Location: portland or
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| Posted: Mon Jun 08, 2020 8:39 pm Post subject: Re: Megasquirt my 2276 |
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over run and over run fuel cut are two different things. i am talking about decel fuel amount used at 60 kpa is also being used during accel so auto tune is fighting itself. decel needs less fuel than accel so you need to make your lowest row 55kpa. doing that allows accel to still use 60 kpa and decel over run will use 55 kpa. i also found with the last data log that you are having various sync loss. if you can send me the new tune to go with this data log we can figure out what is happening.......
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UK Luke 72
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Posts: 2867
Location: Little Britain
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| Posted: Tue Jun 09, 2020 7:55 am Post subject: Re: Megasquirt my 2276 |
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| gprudenciop wrote: |
| over run and over run fuel cut are two different things. i am talking about decel fuel amount used at 60 kpa is also being used during accel so auto tune is fighting itself. decel needs less fuel than accel so you need to make your lowest row 55kpa. doing that allows accel to still use 60 kpa and decel over run will use 55 kpa. i also found with the last data log that you are having various sync loss. if you can send me the new tune to go with this data log we can figure out what is happening....... |
Ok I'll drop down to 55kPa and retune.
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gprudenciop
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Location: portland or
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| Posted: Tue Jun 09, 2020 9:50 pm Post subject: Re: Megasquirt my 2276 |
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i smoothed out your fuel,afr and timing maps. i also added more accel enrich and turned on fuel cut. when you get the tune closer you can lower the ego active temp down from 200c for it to work.make sure your crank sensor wiring is not close to spark plug wires or battery wires. try to keep it separate from the rest of the wires.. i turned on the noise filter also. the timing map was at full advance at 2400 rpm i moved it up alittle becouse i remember getting some pinging with my 2276 when advancing to early. enjoy
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gprudenciop
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Joined: July 06, 2008
Posts: 606
Location: portland or
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| Posted: Thu Jun 11, 2020 8:35 pm Post subject: Re: Megasquirt my 2276 |
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you have something wrong with your wideband and/or o2 sensor. its impossible to have ve at 8 with kpa at 85........ did you calibrate your afr table? did you reload the firmware? exhaust leak by sensor? double check the wide band.....battery voltage is also low. did you calibrate battery voltage?
also what injectors are you running? you have it set up for peak and hold injectors but that is rare to see nowadays? it takes some moding of the ms or resistors....?what fuel pressure regulator? sure is a pain to remote tune isnt it!! 
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gprudenciop
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Location: portland or
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| Posted: Thu Jun 11, 2020 10:05 pm Post subject: Re: Megasquirt my 2276 |
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ok i found your problem! your tps is not working correctly it is dropping to zero when you are accelerating....#tpsnoworky #noaccelenrich
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UK Luke 72
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Location: Little Britain
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| Posted: Fri Jun 12, 2020 7:34 am Post subject: Re: Megasquirt my 2276 |
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Ok that's odd, I've got a new throttle linkage just arrived so Ill get that swapped out.
We've had loads of rain so I'm. Or sure if that's causing some wiring issues.
Not noticed the TPS dropping out. I'll keep an eye on it.
Injectors? Um, they're out of my old mini cooper s. 330cc. Not peak and hold.
Not calibrated the AFR table. Didn't realise that was a thing
Battery voltage I've checked, I was having some ign issues that turned out to be voltage drop thing issue
It's a racing lines pressure reg
Exhaust, can't see any soot or signs of leaks.
Inj. wires run separate to the crank trigger wires. Also the HT leads are out of the way.
I'll check for latest firmware too.
Whilst I'm at it, I'll start a new project, delete everything I have and that way I won't get confused over different saves.
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gprudenciop
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Location: portland or
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| Posted: Fri Jun 12, 2020 4:22 pm Post subject: Re: Megasquirt my 2276 |
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What brand and model is your wideband?
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