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Old 04-11-2013, 12:04 PM   #1
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Question DIY MS2E misfire weirdness

Ok so I'm helping Ryan dial in his MS, and we've run into a weird issue that I can't seem to figure out, or maybe I'm just going full retard.

Here's the breakdown:

Built 1.6 T3 churbo GM coils with NGK irridium plugs gapped to like .25
DIY ms2e built by Ryan and checked on the bench by Mr Braineak himself. AEM uego wideband. FIC ev14 injectors. E85. stock tb. no idle valve. Stock cas and other sensors. Some sort of vtps (will have to clarify with Ryan)

I think that's all that's relevant, feel free to tell me if I'm wrong.

Anyways, here's the issue:

The car stumbles when going into boost abruptly. I'm almost positive its a massive mis-fire. That's what it feels and sounds like.

All the vitals: boost, afr, etc seem to look ok when this happens. When going into boost slowly and part throttle, its fine. Boost cut is raised way up so its not that. Fuel and timing are good and smooth, no issue there at all.

Log attached.

*RYAN: please chime in here with as many details as possible so we can resolve this before Tuesday*


Any help is appreciated. I'm probably missing something or some other type of retardation, but that's what I have you gayz for


*edit: oh and PS - this might not even be a tuning or MS issue, but I want to make sure and rule that out before doing anything else. Ryan is going through all the connections, grounds, and other stuff with a fine-toothed comb now to rule out the possible hardware issue.
Attached Files
File Type: msl 2013-04-08_12.45.40.msl (736.3 KB, 55 views)
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Old 04-11-2013, 12:42 PM   #2
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I do believe it is a mechanical issue. The car is going up as jackstands tonight and going to be gone through. Check all my grounds, check all my connections. I ran this by Vlad also, but I'm wondering if I could have a faulty solder inside the MS itself.

When leaving a stop sign, if I release the clutch too quickly and the car chatters it'll hiccup, stumble on it's face. Then it cleans up and runs fine. Also when getting into boost if I just punch the throttle it sort of does the same thing. If I really baby it and don't hammer it it doesn't do it. I have the exhaust turned down underneath the car and I believe it is a cause for my major vibration. I'm wondering if rubber mounting the MS will help anything. Right now it's ridged mounted up under the dash.

It has a wells tps mod that I did following brains write up.

Listed grounds, maybe I have one missing.
-battery to inside of trunk
-ppf
-driver side head to shelf
-coils to head
-there is a factory ground on the intake
-ground block by the clutch master cylinder

Those are the ones I have hooked up, cleaned up, no rust or paint on them.
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Old 04-18-2013, 12:51 AM   #3
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The misfire was the stupid fake GM coils.
Switched to toyota cops and all is well
Now to address the tps issue
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Old 04-18-2013, 09:17 AM   #4
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weird.

yes running on mapdot sucks compared to vtps with tpsdot + eae
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Old 04-18-2013, 10:09 AM   #5
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Not as smooth and consistent? Or what?

We're gonna keep trying to figure this crap out. Its clearly a bunch of hardware gayness, much like his "GM" coils which everyone seems to rave about lately, but ended up sucking big time. Or maybe they don't suck and he just got a bad batch. Who knows.
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Old 04-18-2013, 10:13 AM   #6
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mapdot is reactive; it has to read what happed with the MAP sensor and THEN react to it.

tpsdot reacts to the rate of throttle change.
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