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Old 03-01-2012, 04:32 AM   #1
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Default Boost, Stumbling, No Power

One issue fixed, another surfaced.

What is happening is once i get into boost, especially WOT, the car just stumbles as RPMs climb and has no real power.
My N.A NA6 actually feels faster than my Turbo.

I thought it could be Ignition based so I put colder range plugs, BKR7E in and Gapped them down to 0.030" but the issue is still there.

Could someone kindly look at my 3rd gear short pull LOG to see if it tells the story better than me?
One thing i noticed was the RPM in the log gets very SAWTOOTHED in boost. is that normal??
I would appreciate any help!!

http://www.mediafire.com/?727qe7go2y4xwmg


Thanks in advance.
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Old 03-01-2012, 05:04 AM   #2
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What's your afr gauge saying? Can't see log on phone.
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Old 03-01-2012, 05:07 AM   #3
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Its a very short run, but they sit at 12.3/12.2 quite solid.
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Old 03-01-2012, 05:13 AM   #4
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What's your setup? Age of plug wires?
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Old 03-01-2012, 05:17 AM   #5
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Td04
Intercooler
1.6
MS2 Brainy
NGK Blue leads bit over a year old, can try another set.
8PSI
New Plugs
Original Coilpack and Ignitor

Last edited by dweezle; 03-01-2012 at 06:01 AM.
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Old 03-01-2012, 10:31 AM   #6
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What wideband is it, and does it have a display on the wideband controller to verify AFR that is datalog is correct?
Also 16 degrees of spark timing in that area correct?
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Old 03-01-2012, 10:43 AM   #7
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.030 is still a fair amount of gap. Recommended is a bit tighter (.020-.025).

Have you listened with a det can?
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Old 03-01-2012, 10:52 AM   #8
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I had issues with spark plug gaps at .045 so I gapped them to .034
stock 1.6 ignition
This was at and above 1 bar of boost (14.5psi) on a t3 60 trim. My rpms weren't doing the weeble wooble like that though.
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Old 03-01-2012, 11:14 AM   #9
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What is your overboost protection set to?
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Old 03-01-2012, 11:34 AM   #10
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I had a look at the log - it's not overboost protection. Strange thing is I can't find anything other obvious in the log... AFR's do look good (did you recheck them on the WB gauge?)

Did you set the base timing correct?
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Old 03-01-2012, 12:11 PM   #11
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the ignition isn't still locked after the initial sync is it?
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Old 03-01-2012, 12:14 PM   #12
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Ignadvance in the log shows reasonable values...
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Old 03-01-2012, 01:03 PM   #13
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k
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Old 03-01-2012, 03:27 PM   #14
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Sorry for the lack of reply.
Damn Earth being dark on my side

Ignition is set to 10', verified with Timing Light.
Haven't used det cans.
The car starts to boost fine then becomes bogged and starts "vrrrm bat bat vrrrrmmmm bat vrrrrrmm" for lack of a better description.
As if spark stops.
When i was using the standard plugs i did not notice this but it was not as cold as now and Brain said i had too much timing to be safe ... oops.

If i use half throttle it feels better.

Wideband is LC1.
I have a innovate g5 gauge and it reads 1/4 point different but looks solid.
Checked the plugs and they look a bit rich.
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Old 03-01-2012, 05:48 PM   #15
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datalog with part throttle in boost and full throttle in boost?
also tune file
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Old 03-01-2012, 06:04 PM   #16
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Sounds like a bad coil.
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Old 03-02-2012, 07:29 PM   #17
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Another thing that hit me over night is i noticed at idle a 'misfire'.
Every second or 2 it would sound as though it missed a spark event.
I did not notice this before and i think i put it down to my idle not being fine tuned yet but maybe it is the same issue under boost @ WOT.

I think i have another coilpack floating around and different leads so i guess i will go give that a crack.
I will also bring the spark gap down to 0.025.

Thanks for everyone's advice so far.
Much Appreciated!!
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Old 03-09-2012, 03:21 AM   #18
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so i changed coilpack, regapped plugs to 0.025 and newleads.
Issue still there but perhaps slightly less.

But still weird power loss issues.
Thought about it and i am pretty sure it started after i made a cheap intake with a JustCrap silicone 130' hose.
I had a look and it is so soft, it just collapses with slight pressure.

My question is :
Under load/boost would there be enough vacuum to suck this closed??
Or is that a dumb thought??


http://www.youtube.com/watch?v=3YJMb...ature=youtu.be

Here is a vid of how easily it collapses.
I am using almost no pressure.
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Old 03-09-2012, 04:54 AM   #19
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.25 seems awful close. I'd try .30 or at least .28 for a start.
My initial reaction leads to secondary ign. That's the least reliable part of the system. Usually.
Are you using 'normal' plugs? Or something 'exotic'?
Also, if your 'intake' was collapsing, wouldn't your O2 show this? (rich?)
A Loss of power could be a lean condition. Intake leak maybe?

BTW, This post is influenced by no slight amount of inebriation, So,take it with that in mind..
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Old 03-09-2012, 05:44 AM   #20
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Its the pipe.

Dann
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