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12-22-2013, 10:48 PM | #1 |
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1/4 mile performance - 35i
All,
Just wanted to share with you my experience at the track last night... Just two runs. Temperature was around 55 degrees. I did NOT use launch control. Run #1 (I'm on the right, versus a stock automatic 2008 Pontiac G8 GT): Run #2 (I'm on the right again, versus a modded/tuned manual 2011 Mustang 5.0 GT): Cobb stage 1+FMIC tune; and Wagner Tuning FMIC. Everything else performance-wise is stock (including the stock rims and tires). I didn't do any runs when I just had the Stage 1 tune by itself. But really couldn't tell much difference in driving power with and without the FMIC tune. Maybe just a little bit. I'm sure the Cobb Stage 1 by itself would break the 13 second barrier as well. But good to know the Stage 1+FMIC tune is a consistent 12.8 car! I'm hoping that after downpipes, a re-flash of the tune to Stage 2+FMIC, and new rubber, I could possibly get down to breaking the 12.5 barrier. I drive a 2011 sDrive35i with DCT, sport package, 23k miles. |
12-23-2013, 07:47 AM | #3 |
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Did you run with DTC off and in Manual Mode? I am just curious.
Those are good times. I ran about the same when I had my 135i but it was a manual and I could never get any traction. |
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12-23-2013, 09:59 AM | #4 |
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I ran with the suspension/shifting setting in Sport Plus, and the tranny in Sport.
Apparently, Sport Plus only removes about 50% of the traction control. And I found out that if I remove traction control completely, it does remove 100% of the traction control, but it reverts the suspension/shifting setting back to Normal/Comfort. So completely removing the traction control was not an option for me. Also, I did not use the paddle shifters, I just let the car shift when it wanted to. I did go through and calculate the optimum shit points for each gear, so maybe next time I go to the track (if I ever go again -as I'm moving out of state in three weeks), I will try actually shifting manually. |
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12-24-2013, 01:04 PM | #6 |
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Please see my previous post...
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12-25-2013, 08:52 AM | #7 | |
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Quote:
In S mode the car up-shifts too early in first and second gear (6.5k instead of 7k), and sometimes even double up-shifts in case of excessive wheel-spin. Also S-mode, in my personal opinion (some disagree), drops the clutch harder than in M-mode, and this would increase the risk of wheel-spin. With DSC=off you get slightly softer/better matched gear changes in both S and M mode compared to sport+. This might be a good thing especially when you start to run higher boost and all milliseconds count. I know that with the adaptive suspension you loose the firmest setting with DSC=off, but avoiding wheel spin on gear-shifts alone might mean "DSC=off"&"DCT M mode" is a faster combination than "Sport+"&"DCT S/M mode". Not just because wheel spin in and by itself is a waste of energy, but because it might trigger the ECU to temporarily "limp" the engine even in sport+ mode. This is particularly unwanted in a turbo engine like the N54. Finally you can consider dragging with the roof down to add weight over the rear wheels. And btw, it is possible to let the DCT start in 2nd gear if you really feel like experimenting... personally I am out of warranty and I wouldn't dare to..! |
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12-25-2013, 11:34 AM | #8 | ||||
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Quote:
Quote:
I left the tranny in Sport mode the whole time just to see how the computer would do on it's own. Next time, I will try to memorize these shift points, and see if I can't go a little faster shifting on my own! Quote:
Luckily, I only had slight wheel spin at the end of 1st gear, but the engine did not enter limp mode! Both times this happened. No power was cut and the engine shifted into second gear on its own both times perfectly. Quote:
It is indeed possible...but I think the performance times would be quite a bit worse. |
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12-26-2013, 12:25 AM | #10 |
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Nice times OP! Congrats
I came across this post where an N54 335 owner shared his dynos for each modification and the FMIC was the 2nd biggest gain after the chip. I think based on these dynos and your trap speed the FMIC is a nice gain over just the stage 1 tune http://www.extremeturbosystems.com/E...p-Dyno-Sheets/ |
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12-27-2013, 08:30 AM | #11 | |
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I guess my main point was that If wheel spin becomes a problem as you add more torque you can try DSC=off + DCT M-mode. BTW I am surprised that you need to upshift before red line in 1st with any N54 tune, but I believe DCT S-mode up-shifts at 6.5k by default in any gear unless you press the kick down switch. In any case, revving to 7k is another way to reduce wheel spin caused by gear shifts - if present. |
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