RENNtech 335iS DCT Acceleration Demo

BQTuning · 10-30-2012, 04:51 PM

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

marv85 · 10-30-2012, 05:14 PM

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?

enrita · 10-30-2012, 05:28 PM

nice gearbox and yes what happens at 1:38? that was weird.

ragingpanda · 10-30-2012, 05:30 PM

Car seems quick, what do you hope to run the next time you go to PBIR?

Wedge1967 · 10-30-2012, 05:52 PM

The glitch at 1:38 is concerning. Can't really tell, but did the engine over rev on downshift?

ihc95 · 10-30-2012, 05:58 PM

The way the DCT shifts

BQTuning · 10-30-2012, 06:22 PM

Quote:

Originally Posted by marv85

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

nice gearbox and yes what happens at 1:38? that was weird.

Quote:

Originally Posted by Wedge1967

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.

BMWnation · 10-30-2012, 08:04 PM

Quote:

Originally Posted by BuraQ

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

BQTuning · 10-30-2012, 08:39 PM

Quote:

Originally Posted by BMWnation

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

Fully_Bolted · 10-30-2012, 09:01 PM

I could totally take you.

Laid Black 335i · 10-30-2012, 09:33 PM

Damn those DCT shifts are fast.

BQTuning · 10-30-2012, 10:58 PM

Hmm I am getting couple of hints of Vacuum leak ?

marv85 · 10-30-2012, 10:59 PM

Quote:

Originally Posted by BuraQ

Hmm I am getting couple of hints of Vacuum leak ?

what makes you say that?

BQTuning · 10-30-2012, 11:08 PM

Quote:

Originally Posted by marv85

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

BQTuning · 10-31-2012, 11:01 AM

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

marv85 · 10-31-2012, 11:11 AM

Quote:

Originally Posted by BuraQ

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

marv85 · 10-31-2012, 11:12 AM

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

chsbmw · 10-31-2012, 11:38 AM

Running real strong! Still waiting on that launch tutorial video.

TwinTurboIS · 10-31-2012, 11:48 AM

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?

BQTuning · 10-31-2012, 12:18 PM

Quote:

Originally Posted by TwinTurboIS

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.

AK 335i · 10-31-2012, 02:07 PM

Quote:

Originally Posted by BuraQ

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

10-30-2012, 04:51 PM	#1
BQTuning Banned 469 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	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
marv85 Colonel 70 Rep 2,626 Posts Drives: '07 E92 335i MT Join Date: Jun 2010 Location: Bay Area iTrader: (7)	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? __________________ '07 E92 335i 6MT- HP650, inlets/outlets, ER FMIC, VRSF CP, LPFP stg2, CSF rad, 'is Aux rad, ER OC, Ohlins, M control arms, eibach front sway bar. '05 C55 AMG SOLD - '22 Tesla M3P \| '10 E92 335i M, 6MT COBB, FBO, st2 LPFP, Mfactory LSD \| '07 E90 335i, PTF COBB E50, FBO, HFS4
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10-30-2012, 05:28 PM	#3
enrita Major General 161 Rep 7,378 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	nice gearbox and yes what happens at 1:38? that was weird. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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10-30-2012, 05:30 PM	#4
ragingpanda Banned 321 Rep 751 Posts Drives: 135i Join Date: May 2012 Location: Florida iTrader: (0)	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
Wedge1967 Banned 125 Rep 2,172 Posts Drives: '07 e92 AT Sport Montego Blue Join Date: Sep 2011 Location: Portland, OR iTrader: (3)	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
ihc95 Major 145 Rep 1,314 Posts Drives: 2021 X3 M40i, 2018 Mustang GT Join Date: Jul 2011 Location: NJ iTrader: (1) Garage List 2007 BMW 335i Coupe [0.00]	The way the DCT shifts
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10-30-2012, 09:01 PM	#10
Fully_Bolted Banned 11 Rep 442 Posts Drives: E92 335i Join Date: Sep 2012 Location: USA iTrader: (0)	I could totally take you.
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10-30-2012, 09:33 PM	#11
Laid Black 335i BMW 71 Rep 974 Posts Drives: 2007 BMW 335i (6MT) Join Date: Mar 2011 Location: MD iTrader: (7)	Damn those DCT shifts are fast. __________________
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10-30-2012, 10:58 PM	#12
BQTuning Banned 469 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	Hmm I am getting couple of hints of Vacuum leak ?
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10-31-2012, 11:01 AM	#15
BQTuning Banned 469 Rep 4,392 Posts Drives: 2012 Z4 sDrive35i M Sport 6MT Join Date: Nov 2010 Location: bq@bqtuning.com iTrader: (0)	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 Last edited by BQTuning; 10-31-2012 at 11:10 AM..
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10-31-2012, 11:12 AM	#17
marv85 Colonel 70 Rep 2,626 Posts Drives: '07 E92 335i MT Join Date: Jun 2010 Location: Bay Area iTrader: (7)	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 __________________ '07 E92 335i 6MT- HP650, inlets/outlets, ER FMIC, VRSF CP, LPFP stg2, CSF rad, 'is Aux rad, ER OC, Ohlins, M control arms, eibach front sway bar. '05 C55 AMG SOLD - '22 Tesla M3P \| '10 E92 335i M, 6MT COBB, FBO, st2 LPFP, Mfactory LSD \| '07 E90 335i, PTF COBB E50, FBO, HFS4
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10-31-2012, 11:38 AM	#18
chsbmw Private 1 Rep 83 Posts Drives: 2011 335is coupe Join Date: Aug 2011 Location: SC iTrader: (0)	Running real strong! Still waiting on that launch tutorial video.
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10-31-2012, 11:48 AM	#19
TwinTurboIS New Member 1 Rep 18 Posts Drives: 335is Join Date: Aug 2012 Location: L.A. iTrader: (0)	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? __________________ BMW 335is \| e92 \| A96 \| LCD3 \| ZCV \| ZCW \| ZPP \| 2TC \| 217
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