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  1. #1
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    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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    If i show-up tomorrow I want to run you.




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    nice runs... What happened @1:38? I didn;t know the DCT downshifts even if it is fast for the gear!
    SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555

    '10 E92 335i M, 6MT COBB v3, ER IC, ER CP, VRSF DP, Fuel-it st2
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    Click here to enlarge Originally Posted by E90SoFlo Click here to enlarge
    If i show-up tomorrow I want to run you.
    You have a manual right?
    SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555

    '10 E92 335i M, 6MT COBB v3, ER IC, ER CP, VRSF DP, Fuel-it st2
    installing soon: Mfactory LSD, , powerflex subrframe bushings

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    I hope I am not super tired from work tomorrow so I can come play as well...Click here to enlarge

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    Click here to enlarge Originally Posted by marv85 Click here to enlarge
    nice runs... What happened @1:38? I didn;t know the DCT downshifts even if it is fast for the gear!
    Yeah I saw that at 1:38 that was weird but looked cool lol...

    Curious to see if someone can confirm it was a downshift? Makes sense bc he let off the throttle I guess
    PERFORMANCE: Cobb AP \ JB4 \ DCI \ AR Downpipes \ CX FMIC \ ER Chargepipe \ Synapse BOV \ KW V2 \ Muffler Delete \ CDV \ ZHP Shifter \ Cyba Scoops
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    @BuraQ

    Besides the weird downshift... I saw your explanation on e90 but I guess regardless it's not something you want happening frequently, right?

    btw, can you shed some details on your tune? Boost, timing mainly
    SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555

    '10 E92 335i M, 6MT COBB v3, ER IC, ER CP, VRSF DP, Fuel-it st2
    installing soon: Mfactory LSD, , powerflex subrframe bushings

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    Click here to enlarge Originally Posted by rooringhusky Click here to enlarge
    Yeah I saw that at 1:38 that was weird but looked cool lol...

    Curious to see if someone can confirm it was a downshift? Makes sense bc he let off the throttle I guess
    Definitely cool to see Click here to enlarge I'd freak out though if I see on my car lol
    SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555

    '10 E92 335i M, 6MT COBB v3, ER IC, ER CP, VRSF DP, Fuel-it st2
    installing soon: Mfactory LSD, , powerflex subrframe bushings

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    Click here to enlarge Originally Posted by marv85 Click here to enlarge
    nice runs... What happened @1:38? I didn;t know the DCT downshifts even if it is fast for the gear!
    Click here to enlarge Originally Posted by rooringhusky Click here to enlarge
    Yeah I saw that at 1:38 that was weird but looked cool lol...

    Curious to see if someone can confirm it was a downshift? Makes sense bc he let off the throttle I guess
    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 in WOT

    Something to do with throttle closure and back pressure that causes that surge.

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    Click here to enlarge Originally Posted by marv85 Click here to enlarge
    @BuraQ

    Besides the weird downshift... I saw your explanation on e90 but I guess regardless it's not something you want happening frequently, right?

    btw, can you shed some details on your tune? Boost, timing mainly
    It doesnt throw any codes, its been doing that from since I had the tune but only when I have the Sport but turned on and I immediately let off the gas from a WOT.

    If I slowly or progressively let off the gas it doesnt happen. Its got to be some sort of back preasure that the DV's are not reacting quick enough to I suppose and it related to the throttle closure being closed too quickly

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    Click here to enlarge Originally Posted by BuraQ Click here to enlarge
    It doesnt throw any codes, its been doing that from since I had the tune but only when I have the Sport but turned on and I immediately let off the gas from a WOT.

    If I slowly or progressively let off the gas it doesnt happen. Its got to be some sort of back preasure that the DV's are not reacting quick enough to I suppose and it related to the throttle closure being closed too quickly
    That would scare the crap out of me seeing as it revs to almost 8k rpms's Click here to enlarge Good luck at the track tomorrow, hope you break into 11's

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    Click here to enlarge Originally Posted by bmw335iguy Click here to enlarge
    That would scare the crap out of me seeing as it revs to almost 8k rpms's Click here to enlarge Good luck at the track tomorrow, hope you break into 11's
    Yea I know...cant find anyone with similar issue
    Last edited by BuraQ; 10-30-2012 at 11:35 PM.

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    What's the 60-130 time? Looks to be around 10sec? Pretty cool seeing the DCT work. Good stuff!

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    Click here to enlarge Originally Posted by rudypoochris Click here to enlarge
    What's the 60-130 time? Looks to be around 10sec? Pretty cool seeing the DCT work. Good stuff!
    Look like 10 sec

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    Hmm I am getting couple of hints of a possible Vacuum leak ?

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    Click here to enlarge Originally Posted by BuraQ Click here to enlarge
    Hmm I am getting couple of hints of a possible Vacuum leak ?

    What makes you say that?
    SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555

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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

  18. #18
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    Glad that have a fix for you. I wouldnt enjoy revving my N54 to 7.5k.
    2011 E90 M3 \ Melbourne Rot Metallic

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