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      06-01-2013, 06:54 PM   #1
Scott B
Second Lieutenant
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Drives: 1M
Join Date: Dec 2007
Location: NorCal

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Laguna Seca pics, a vid, and a question








The OBD data gets a little whacky, but it's the best time I ran all day.


Now for my question. My car's powertrain is stock with exception of a Forge FMIC, and Cobb reflash (Stg1+FMIC LT Sport IKC0S 1M v402 + Linear Throttle). At Laguna, I run a mix of about 97+ octane to prevent detonation. What I'm experiencing after about the first lap of every session is some fluctuation in power delivery at full throttle. On the first lap, as on the street, power delivery is very predictable and linear with pedal input. I suspect something is getting hot and that the DME is throttling boost in response, but I'm not exactly sure -- that's what it feels like, anyway. Oil temps look about 260* on the gauge. Ambient temps were about 85* F.

Two things I should have tried that day:
1) Reflashing to a less aggressive map (although the one I'm running fits my level of mods)
2) Datalogged the DME

Any ideas what could be going on or what might be getting hot? As you can see in the video, it isn't really a problem per se, more of a slight imperfection that I can feel while driving. Thoughts welcome.

Last edited by Scott B; 06-02-2013 at 03:38 PM..
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