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Old 05-17-2012, 02:23 PM   #1
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Default Issues under load. Diagnose my log!

Hey guys,
I'm trying to figure out an issue with my car. Under high load (4th, 5th, 6th WOT) I sometimes get loss of sync with issue code 38 or 39. I have opto-isolator circuit.

There are 3 of them right here. This is in 5th gear (on a 6spd).


log - http://s95367906.onlinehome.us/photo...20-%20Copy.msl

I don't have my exact tune but it's this https://www.miataturbo.net/attachmen...4&d=1336600059
The only thing I changed since was boost duty - 20% instead of 55%.

Ignition is Toyota COPs (all seem to be working. I had 1 die, but right now all are working). Wasted spark. BKR7E plugs gapped down to 0.030. 2.2ms dwell with correct voltage adjustment curve.

My ideas:
- Detonation? (will retard timing)
- Dying CAS? (will try a spare one)
- Weak spark? (resistorless NGK Race plugs arriving today)
- ?????
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Issues under load. Diagnose my log!-datalog.jpg  
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Old 05-17-2012, 02:24 PM   #2
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I have no help for you, except to say GODDAMN the power linearity in that log. TPS and MAP rise at almost the same rate.

6258 > *
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Old 05-17-2012, 03:50 PM   #3
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Could you capture a composite log of the loss of sync?
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Old 05-17-2012, 04:08 PM   #4
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Quote:
Originally Posted by Matt Cramer View Post
Could you capture a composite log of the loss of sync?
Will do!
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Old 05-17-2012, 06:07 PM   #5
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Opto circuit? wtf use the vr circuit and then the expan.der for cam in.
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Old 05-17-2012, 06:31 PM   #6
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Quote:
Originally Posted by Braineack View Post
Opto circuit? wtf use the vr circuit and then the expan.der for cam in.
Oh this is MS2 that I bought from you in 2010, partially assembled.
MS3 will go in after track day because I want to rip out the whole wiring harness.

I'll be also using 36-1 wheel and castrated CAS so that will be a whole different topic. I just need to get THIS ---- running NOW.
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Old 05-17-2012, 08:55 PM   #7
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heres the sync loss composite log. 2 events in it. I don't know how to interpret.

this was with my old timing map, so I guess I can rule out pre-detonation. Going to try with my spare CAS now.
Attached Files
File Type: csv 2012-05-17_19.47.11.csv (22.3 KB, 49 views)
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Old 05-17-2012, 11:35 PM   #8
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I'm pretty sure the issue is in my MS2 mod wiring. It's a clusterfuck.

So I decided to just finish my MS3 (which is a joke to build) and run it with my old wiring/harness/whatever. Flashing firmware on it right now
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