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> Dyno day, Now with figures!!!
emerygt350
post Nov 20 2021, 02:32 PM
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Just got back from the Dyno. We were able to tune the mps reasonably well. Still have a little leanness at wot and lower rpms and richness at wot at high rpms but overall pretty smooth. Waiting to get the figures from the shop. If I remember right it was 77 horsepower and 105 lbs of torque at the wheels. I am running big 225/50r16s so I suspect I would pick up some more with lighter stock rims and tires....

I will post the graphs as soon as I get them.

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mgp4591
post Nov 20 2021, 03:18 PM
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QUOTE(emerygt350 @ Nov 20 2021, 01:32 PM) *

Just got back from the Dyno. We were able to tune the mps reasonably well. Still have a little leanness at wot and lower rpms and richness at wot at high rpms but overall pretty smooth. Waiting to get the figures from the shop. If I remember right it was 77 horsepower and 105 lbs of torque at the wheels. I am running big 225/50r16s so I suspect I would pick up some more with lighter stock rims and tires....

I will post the graphs as soon as I get them.

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What engine are you running?
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Shivers
post Nov 20 2021, 03:34 PM
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So about 93 horsepower, plenty to be fun. (+-) This a 2056?
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emerygt350
post Nov 20 2021, 03:45 PM
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Stock 73 2.0 djet. I do have an ansa muffler and a k and n filter on it. And a 123 dizzy (not Bluetooth)
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Shivers
post Nov 20 2021, 04:55 PM
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Great
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Van B
post Nov 20 2021, 05:17 PM
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That’s so f***ing cool.
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emerygt350
post Nov 20 2021, 05:42 PM
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Tom at overdrive automotive in Binghamton NY is great. Drilled a bung in my exhaust (muffler, not the stainless) for the 02, probably 8 pulls plus all the idle and part throttle tuning. He really is great to work with. I described how the mps works, the ECU idle richness, etc. I have the tangerine racing tuning kit on my mps. He just dived in and had fun with it. One thing I will mention, we tried to advance the timing a hair to see if there was more there. We lost 20 horsepower with just a couple degrees of extra advance. Crazy how bad it was.
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PanelBilly
post Nov 20 2021, 06:25 PM
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I want a video with sound!!
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emerygt350
post Nov 20 2021, 06:45 PM
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I knew I should have taken a video... Stupid not to. You will just have to imagine the vroom vroom sounds when I post the graphs.
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Van B
post Nov 20 2021, 07:51 PM
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Yes, yes you should have. And we are all very disappointed in you.

But, I get it. Most people don’t think like you tubers. We go to a shop to do stuff, not film a video lol…
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emerygt350
post Nov 20 2021, 08:17 PM
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Funny thing is everyone in the shop "knew" when we screwed up the timing. They were not paying any attention till that pull then everyone was like "ouch!" What happened!?
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Van B
post Nov 21 2021, 09:17 PM
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Deleted* I need to think more about what I was about to recommend

Question instead: what happened to the richness at high RPM WOT when you advanced and by how much did you advance?
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emerygt350
post Nov 22 2021, 08:52 AM
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It got super rich, black smoke everywhere. Lost 20 horsepower. Tom said he maybe put 5 degrees into it.

Judging by the couple hundred rpm at idle increase I think that was about right.
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Van B
post Nov 22 2021, 09:17 AM
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doesn't the 123 ignition let you create a custom ignition map; as in being able to advance at high RPM without being forced to advance across the whole curve?

I'm struggling to get my head around how advancing further causes increased richness. Unless it was so much advance that it was igniting prior to sufficient compression was reached to achieve a full burn.
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ValcoOscar
post Nov 22 2021, 09:20 AM
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I just noticed the rear FUCHS spinning

(IMG:style_emoticons/default/willis.gif)

Congrats (IMG:style_emoticons/default/beerchug.gif)

Oscar
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emerygt350
post Nov 22 2021, 09:32 AM
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QUOTE(Van B @ Nov 22 2021, 10:17 AM) *

doesn't the 123 ignition let you create a custom ignition map; as in being able to advance at high RPM without being forced to advance across the whole curve?

I'm struggling to get my head around how advancing further causes increased richness. Unless it was so much advance that it was igniting prior to sufficient compression was reached to achieve a full burn.


I think that is exactly what happened.

And I have the non-bluetooth 123 so I believe I only have the built in mapping to work with.
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Van B
post Nov 22 2021, 11:47 AM
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Maybe one step up on the plug heat range then?
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emerygt350
post Nov 22 2021, 12:37 PM
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QUOTE(Van B @ Nov 22 2021, 12:47 PM) *

Maybe one step up on the plug heat range then?


I thought that was just for chamber temperature differences. Although I have always been unsure about heat range differences in plugs.

I also have a very old coil. I wonder if my spark can keep up with the high rpm firing?
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Van B
post Nov 22 2021, 02:39 PM
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More resistance in the plug means more energy build up before the spark can jump the gap. So, a more powerful can overcome the sparkplug resistance quicker and provide more arc energy to the spark itself... but there's a lot of other assumption on that as well: plug wires, etc. But treating the coil as a constant, a higher resistance plug can alter the actual spark timing just ever so slightly. Going to Coil On Plug (COP) is what gave manufacturers the ability to really tune engines for efficiency. Even differing length of plug wires varies resistance between cylinders.

Regardless, you want to be a little rich at high RPM and WOT... the last place you want detonation is during the most stressful parameters for engine operation. Being a little lean off the bottom can give a more snappy throttle response too. The problem you run into when trying to nail the AFR is that you have no forgiveness in the fuel. I'm sure we all run premo fuel, but let's say you fill up one day and the premium is 1 octane point lower than what you used for tuning and you dialed in a perfect 14.7:1 AFR... well now you have a detonation problem.

So, there's no point in running a street engine at 14:1 AFR. I'd like to know the ratios you were seeing at "a little lean, and a little rich" for my own curiosity. But if you're even 12:1, I'd say you're just fine.
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JamesM
post Nov 22 2021, 02:52 PM
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QUOTE(emerygt350 @ Nov 20 2021, 04:42 PM) *

Tom at overdrive automotive in Binghamton NY is great. Drilled a bung in my exhaust (muffler, not the stainless) for the 02, probably 8 pulls plus all the idle and part throttle tuning. He really is great to work with. I described how the mps works, the ECU idle richness, etc. I have the tangerine racing tuning kit on my mps. He just dived in and had fun with it. One thing I will mention, we tried to advance the timing a hair to see if there was more there. We lost 20 horsepower with just a couple degrees of extra advance. Crazy how bad it was.



What wound up working the best as far as timing goes? 27-28 degrees total advance?
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