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Old 10-01-2016, 02:43 PM   #1
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Default I found my problem.



Still wondering what caused it, only bad on 2. Im leaning towards bad injector but wondering if it could be in the tune.
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Old 10-03-2016, 01:32 PM   #2
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Post photos of the other three and we'll all tell you
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Old 10-03-2016, 02:09 PM   #3
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I have bed memories of this
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Old 10-03-2016, 03:06 PM   #4
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I have bed memories of this
'round here part, we call them dreams.
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Old 10-03-2016, 04:43 PM   #5
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or nightmares....
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Old 10-03-2016, 07:44 PM   #6
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3

1

4

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Old 10-03-2016, 08:25 PM   #7
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Post your tune so others can learn what not to do
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Old 10-03-2016, 08:52 PM   #8
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Post your tune so others can learn what not to do
Along with facts about engine (Compression Ratio) and type of fuel.
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Old 10-03-2016, 08:56 PM   #9
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It was done by fnp tuning and I had a hunch since day one tune was off.

Stock internals(9:1 comp i am pretty sure). 8.5 psi boost. rx8 yellow injectors, 91 octane is the highest we get around here.
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File Type: msq FNP91_01_ffs_lc.msq (107.6 KB, 29 views)
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Old 10-03-2016, 09:41 PM   #10
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Do you have any logs? I'm interested to hear Andrew's comments. But I will hazard a guess with what I saw.

To me, the VE table looks like it was created while "Incorporate AFR Target" was active, but that feature was later turned off. That, along with the MAT corrections makes me guess running lean. Spark does not seem that bad. Lots of EGO authority, but I'm not sure enough.
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Old 10-03-2016, 10:07 PM   #11
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this is from 2 dyno pulls after i switched to 3"
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File Type: msl 2016-06-28_19.26.20.msl (1.39 MB, 28 views)
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Old 10-04-2016, 11:34 AM   #12
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I don't see any glaring problems in the log. I guess the low atmospheric pressure (you only seem to be seeing 87kpa at FT and low RPM) is due to elevation- correct?
Also why is there this dip in your spark advance around 4400rpm? Was it knocking? Is that spark tuned on the dyno?
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Old 10-04-2016, 11:43 AM   #13
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Why doesn't your MAT change with boost?

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Old 10-04-2016, 01:25 PM   #14
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looks like it ran pretty lean...
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Old 10-04-2016, 02:23 PM   #15
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Why doesn't your MAT change with boost?
Best intercooler ever!!!!!!!!!!!!!!!
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Old 10-04-2016, 07:02 PM   #16
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Originally Posted by stefanst View Post
I don't see any glaring problems in the log. I guess the low atmospheric pressure (you only seem to be seeing 87kpa at FT and low RPM) is due to elevation- correct?
Also why is there this dip in your spark advance around 4400rpm? Was it knocking? Is that spark tuned on the dyno?
Atmospheric is due to altitude. I didn't notice any knocking. It was dynotuned.

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Why doesn't your MAT change with boost?
I have no idea. 3 inch plumbing maybe?
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Old 10-07-2016, 12:36 AM   #17
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I'm a day away from putting my built motor in and want to be as safe as possible as it wasn't the cheapest thing I've ever bought. Do I revert to the stock tune, break it in, then tow it to the tuner (probably not the same tuner) or will it be fine to break it in with the current tune and drive it over there just staying out of boost?
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Old 10-07-2016, 09:58 AM   #18
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I've never "broken in" any engine. Ever. My dirtbikes go from the dealer to the track. My built miata went from tune to autocross. Like 15 miles, maybe less. No problems ever. Althoigh with my miata, i botched the initial tune process pretty bad. So maybe that counts as a break in period? Not saying no to break in, but I don't do it.

I would go straight to the dyno- tuner. Depending on how far you are, maybe take it to the tuner with the current tune as a base. Otherwise, if you have forged pistons now, it should be safe, for a few minutes longer than the last engine....
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Old 10-07-2016, 07:34 PM   #19
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... Otherwise, if you have forged pistons now, it should be safe, for a few minutes longer than the last engine....
Kinda what I was thinking. It's 30 miles which puts it right at the edge of my comfort zone.

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Old 10-07-2016, 10:48 PM   #20
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maybe take it to the tuner with the current tune as a base.
I would tow it to the tuner. That motor was run really lean and/or knocked a lot. The tune shouldn't be trusted at all until it's verified by a good tuner.
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