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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > RENNtech 335iS DCT Acceleration Demo



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      10-30-2012, 04:51 PM   #1
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2011 BMW 335is  [3.03]
RENNtech 335iS DCT Acceleration Demo

Just doing some prep last night for tomorrow at the track. I have been waitng 8 month here in Florida for the temps to drop

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      10-30-2012, 05:14 PM   #2
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Cool runs man. Car is running strong.

btw, what happened 1:38? Does the car actually downshift if it's too fast for that gear?
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      10-30-2012, 05:28 PM   #3
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nice gearbox and yes what happens at 1:38? that was weird.
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      10-30-2012, 05:30 PM   #4
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Car seems quick, what do you hope to run the next time you go to PBIR?
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      10-30-2012, 05:52 PM   #5
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The glitch at 1:38 is concerning. Can't really tell, but did the engine over rev on downshift?
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      10-30-2012, 05:58 PM   #6
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The way the DCT shifts
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      10-30-2012, 06:22 PM   #7
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Quote:
Originally Posted by marv85 View Post
Cool runs man. Car is running strong.

btw, what happened 1:38? Does the car actually downshift if it's too fast for that gear?
Quote:
Originally Posted by enrita View Post
nice gearbox and yes what happens at 1:38? that was weird.
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Originally Posted by Wedge1967 View Post
The glitch at 1:38 is concerning. Can't really tell, but did the engine over rev on downshift?
No it didnt down shift, I let my foot of the gas peddle instantly. It only happens when in sport mode when pulling off the gas peddle suddenly.

Something to do with throttle closure and back pressure that causes that surge.
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Last edited by BuraQ; 10-30-2012 at 07:17 PM.
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      10-30-2012, 08:04 PM   #8
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Quote:
Originally Posted by BuraQ View Post
No it didnt down shift, I let my foot of the gas peddle instantly. It only happens when in sport mode when pulling off the gas peddle suddenly.

Something to do with throttle closure and back pressure that causes that surge.
That appears to be the DTC slipping, then regaining itself
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      10-30-2012, 08:39 PM   #9
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That appears to be the DTC slipping, then regaining itself
DTC, or do your mean DCT ? It has nothing to do with the transmission. DCT slippage doesnt occure from the reverse application of power
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      10-30-2012, 09:01 PM   #10
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I could totally take you.
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      10-30-2012, 09:33 PM   #11
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Damn those DCT shifts are fast.
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      10-30-2012, 10:58 PM   #12
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Hmm I am getting couple of hints of Vacuum leak ?
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      10-30-2012, 10:59 PM   #13
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Hmm I am getting couple of hints of Vacuum leak ?
what makes you say that?
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      10-30-2012, 11:08 PM   #14
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what makes you say that?
Just an up in the air thought, dunno. Will wait for my tuner to respond on what it could be
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      10-31-2012, 11:01 AM   #15
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I got an update for my tune to fix this. Its an over rev caused by the DCT when it disengages the engine after releasing the gas instantly cause the tach to over read the RPM. This would explain why other BMW owners never experienced this issue as I am currently the only one with RENNtech on a DCT N54, and also why it only occures when I have the Sport button enabled
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      10-31-2012, 11:11 AM   #16
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Quote:
Originally Posted by BuraQ View Post
I got an update for my tune to fix this. Its an over rev caused by the DCT when it disengages the engine after releasing the gas instantly cause the tach to over read the RPM. This would explain why other BMW owners were not have this issue as I am currently the only one with RENNtech on a DCT 335iS
What you're saying is there is no actual over rev, but rather wrong reporting of that variable? if So then keep it it looks cool
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      10-31-2012, 11:12 AM   #17
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Although it should be easy to know whether it is an over rev or not just by engine noise. It's not that clear in the video but you can tell for sure
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      10-31-2012, 11:38 AM   #18
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Running real strong! Still waiting on that launch tutorial video.
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      10-31-2012, 11:48 AM   #19
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Always enjoy your input/testing with the n54/dct!
Since you're the only one with a RENNtech tune on this platform, is it available to all now or under testing?
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      10-31-2012, 12:18 PM   #20
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Always enjoy your input/testing with the n54/dct!
Since you're the only one with a RENNtech tune on this platform, is it available to all now or under testing?
Its available to all now....taking car in sometime next week for the update. I have been running like this for 8 months, no issues, so it could wait one more week after track today.
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      10-31-2012, 02:07 PM   #21
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Quote:
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Its available to all now....taking car in sometime next week for the update. I have been running like this for 8 months, no issues, so it could wait one more week after track today.
you sir, are going to smoke me tonight
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