How do you guys decide what timing to run at idle? I was messing with my start-up and warm idle yesterday and it didn't seem to matter where my warm idle was set at. I went from 5 degrees to 28 degrees and it didn't seem to care where it was.
Cold start is a different story.
Timing
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Max Welton
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Re: Timing
Back when I was daily-driving I happened to be watching head temps during a several minute stop in traffic. I noticed that the head temp was slowly rising while I was just idling. This concerned me. At the time I was using 12 degrees BTDC and 12.5 AFR.
When I got home I started fiddling with timing and AFR (easy with Megasquirt) looking for stable idle and head temp. Wound up with advance at 11 with AFR at 13.3.
I doubt this level of fine tuning is practical with oil temp. The lag is just too great. But with head temps ... sure.
Max
When I got home I started fiddling with timing and AFR (easy with Megasquirt) looking for stable idle and head temp. Wound up with advance at 11 with AFR at 13.3.
I doubt this level of fine tuning is practical with oil temp. The lag is just too great. But with head temps ... sure.
Max
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buguy
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Re: Timing
I don't have a head temp or oil temp sensor yet, but have been thinking about adding it. Never thought about using them for turning though.
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Max Welton
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Re: Timing
At the time I had a temp sensor in the rocker galley in the left head ... so not true CHT. But it was enough to see rising vs falling vs stable.
Being able to monitor and fully control everything in real-time is a huge advantage.
Max
Being able to monitor and fully control everything in real-time is a huge advantage.
Max
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buguy
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Re: Timing
I do have a warm up sensor. So i can see it rise and fall.
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Clonebug
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Re: Timing
Warm up sensor will give indicators of head temp.....just not actual.
Stripped66 wrote:The point wasn't to argue air temps with the current world record holder, but to dispel the claim that the K03 is wrapped up at 150 HP. It's not.
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buguy
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Re: Timing
I have it under the screw that holds the head tin on #3 cylinder.
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Max Welton
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Re: Timing
That should perfectly useful!
Max
Max
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buguy
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Re: Timing
Whoa! She's running real hot. Up to 250 on my CLT. I don't remember it getting that hot before. It is also MEGA hot out today. Have to look into that. My throttle cable is real stiff and sticky too. Makes it tough to drive. Have to look at that too. Also the MAT is jumping all over. Not sure what's going on there either. So i have a few things to iron out but i went for a few drives and it made it back on its own. That's a good start.
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Max Welton
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Re: Timing
I know your CLT is not really head temp per se, but 250F at that spot isn't necessarily "real hot". If it were oil temp that would be different.
Max
Max
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buguy
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Re: Timing
Yeah i just looked through some old logs and there were several that were in the 230's. I think that was around February too. So maybe not much hotter than before. This is a new tight engine too, and the silly heat, and i stopped and was idling quite a bit adjusting the shifter.
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Max Welton
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Clonebug
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Re: Timing
Idling will raise the temperature by a quite a bit.......I saw a high of 330 degrees idling in the armpit of America....Barstow, Ca. when my buggy started pinging at cruise due to 106 degree ambient temps and intake temps of close to 130 degrees at cruise.
Lately I was seeing 250 degree cruise temps but have gotten that lowered to 210 degrees with a completely new ignition map below 100 kpa.
It's not easy finding out what your engine likes the best. They will run on almost anything but getting optimal timing takes some work.
The problem is that every engine is different too.....
What I did is take a graph of all the VW distributors and plot them on an ignition map in TS. I then ran a couple of them and tweaked them to get the best vacuum at cruise to optimize the ignition....you can feel it in the pedal when your engine likes the advance.
I like how it's running but my fuel mileage is not very good for some reason.......but the throttle pedal feel has improved by a significant amount....that and my EGT's are down and my CHT's are lower at cruise.
I have my cruise set at 15.1:1 AFR right now. I don't usually go much leaner than that due to pedal feel.
Lately I was seeing 250 degree cruise temps but have gotten that lowered to 210 degrees with a completely new ignition map below 100 kpa.
It's not easy finding out what your engine likes the best. They will run on almost anything but getting optimal timing takes some work.
The problem is that every engine is different too.....
What I did is take a graph of all the VW distributors and plot them on an ignition map in TS. I then ran a couple of them and tweaked them to get the best vacuum at cruise to optimize the ignition....you can feel it in the pedal when your engine likes the advance.
I like how it's running but my fuel mileage is not very good for some reason.......but the throttle pedal feel has improved by a significant amount....that and my EGT's are down and my CHT's are lower at cruise.
I have my cruise set at 15.1:1 AFR right now. I don't usually go much leaner than that due to pedal feel.
Stripped66 wrote:The point wasn't to argue air temps with the current world record holder, but to dispel the claim that the K03 is wrapped up at 150 HP. It's not.
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buguy
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Re: Timing
I put a new shifter in and I'm having trouble getting it adjusted where it goes into all the gears well.Max Welton wrote: ↑Sat Jun 12, 2021 8:06 pmI can't make out what you're trying to say. What about the shifter?
Max