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      06-01-2013, 06:54 PM   #1
Scott B
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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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      06-02-2013, 04:45 AM   #2
bdaddylo
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Did you mean to type your oil temp was 260? To get a better response you should post this in the e90 forum on a COBB thread.
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      06-02-2013, 08:44 AM   #3
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The Cobb has built-in logging capabilities.

Without seeing your logs, it's impossible to know what may be causing the fluctuations to which you're referring.

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      06-02-2013, 03:38 PM   #4
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Quote:
Originally Posted by bdaddylo View Post
Did you mean to type your oil temp was 260? To get a better response you should post this in the e90 forum on a COBB thread.
Yes, fixed. Thank you. Good idea on the cross-post. Will do that now.
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      06-02-2013, 03:52 PM   #5
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Subscribed as have same issue
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      06-02-2013, 03:53 PM   #6
Scott B
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Thanks for chiming in! Keep me posted, please.

Posted on E90 here.
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      06-03-2013, 02:03 PM   #7
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Can't comment on the tune issue. Other than I'm not convinced any current 1M tune has extensive testing on track? I just stuck with 100 oct from Laguna's track pump - motor ran flawlessly in mid 70's temps for all four sessions I ran.

Looks like you're running 18's. What are your wheel and tire specs? And - are you running any sort of suspension modifications? Can't tell if you're any lower than stock from your pics.

Any brake mods? Pads? Fluid?

Thanks for posting up! Car looks great - gives me a glimpse of what I would have had, had I not changed my order from BSM to AW.
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      06-03-2013, 02:47 PM   #8
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Quote:
Originally Posted by Mahlzeit View Post
Can't comment on the tune issue. Other than I'm not convinced any current 1M tune has extensive testing on track? I just stuck with 100 oct from Laguna's track pump - motor ran flawlessly in mid 70's temps for all four sessions I ran.

Looks like you're running 18's. What are your wheel and tire specs? And - are you running any sort of suspension modifications? Can't tell if you're any lower than stock from your pics.

Any brake mods? Pads? Fluid?

Thanks for posting up! Car looks great - gives me a glimpse of what I would have had, had I not changed my order from BSM to AW.
Wheels are 18x9.5 ET 22 with 255x35x18 R888s on the front, and 18x11 ET 18 with 285x30x18 R888s on the rear. Suspension is all stock.

Stock pads with Castrol SRF fluid.
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      06-04-2013, 11:29 AM   #9
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Quote:
Originally Posted by Scott B View Post
Wheels are 18x9.5 ET 22 with 255x35x18 R888s on the front, and 18x11 ET 18 with 285x30x18 R888s on the rear. Suspension is all stock.

Stock pads with Castrol SRF fluid.
What wheels,... that lip looks nice and deep. Given you wide wheels I presume you don't get any turn-in 'squish' from the wider tires?
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      06-04-2013, 12:00 PM   #10
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Quote:
Originally Posted by Mahlzeit View Post
What wheels,... that lip looks nice and deep. Given you wide wheels I presume you don't get any turn-in 'squish' from the wider tires?
Volk TE37 Club Sport wheels. I've not perceived any squish.
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