Kickdown problem

misguided_will · 05-29-2020, 10:01 AM

Hi all

When I kickdown either from standstill or when rolling the car feels like it's struggling and doesn't go. Feels like it's being held back whereas I'm expecting it to just take off.

Can only has a Dinan elite, cat back and CAI.

Is this fuel cut or something else?

Car is relatively low mileage. 17000 km. Never really driven hard until recently when testing the dinan

Ideas?

G.Newt · 05-29-2020, 11:02 PM

Quote:

Originally Posted by misguided_will

Hi all

When I kickdown either from standstill or when rolling the car feels like it's struggling and doesn't go. Feels like it's being held back whereas I'm expecting it to just take off.

Can only has a Dinan elite, cat back and CAI.

Is this fuel cut or something else?

Can is relatively low mileage. 17000 km. Never really driven hard until recently when testing the dinan

Iideas?

Probably the shitty Dinan piggyback lol.

davidr3 · 05-30-2020, 04:37 AM

Is it leaking boost at all? Check CAI and make sure that's secure too. If you're stumped i'd probably try logging a few runs and posting them here.
I'd also check CP for whatever reason if that came lose when working on other components.

Try checking the car for shadow codes too.

maatt · 05-30-2020, 06:59 AM

Quote:

Originally Posted by misguided_will

Hi all

When I kickdown either from standstill or when rolling the car feels like it's struggling and doesn't go. Feels like it's being held back whereas I'm expecting it to just take off.

Can only has a Dinan elite, cat back and CAI.

Is this fuel cut or something else?

Can is relatively low mileage. 17000 km. Never really driven hard until recently when testing the dinan

Iideas?

feels like half a second delay right?
yeah i get that.

misguided_will · 05-31-2020, 02:26 AM

Just feels like resistance.

Rpms going but car just isn't pushing ahead and ripping up the dial

Quote:

Originally Posted by maatt

feels like half a second delay right?
yeah i get that.

CrushJelly · 06-04-2020, 04:34 AM

What drive mode are you in?

I'd wager that it could be Traction Control kicking in. Try the same in DSC OFF mode.

Ifellapart · 06-04-2020, 10:34 AM

Quote:

Originally Posted by misguided_will

Just feels like resistance.

Rpms going and all but car just isn't pushing ahead..

Either that piggyback as the other user said...or your traction control kicking in hard and limiting power. Have you tried it with DSC OFF?

misguided_will · 06-14-2020, 09:10 PM

Tried it out again and seemed ok. Not sure why it was playing up so thanks for all the tips guys.

misguided_will · 08-14-2020, 09:19 AM

I never had this problem in my 435i which would rip hard in all drive mods. Is there some differences in the lcis and b58 to preemptively hold the engine back from revving up quickly like it should?

BMWILUVU · 08-14-2020, 09:59 AM

There are protections in place and maybe Dinan did not run their tuning against a scenario where the sudden kickdown was used. I would call Dinan.

Wires · 08-14-2020, 07:48 PM

I'd say you are having wheel slip. Have you tried what others have said about turning DSC off or trying sport+?

eksigned · 08-18-2020, 10:33 AM

honestly, i'd also point fingers to the piggyback as well. hows it feel with the piggyback uninstalled?

misguided_will · 08-18-2020, 03:45 PM

Quote:

Originally Posted by eksigned

honestly, i'd also point fingers to the piggyback as well. hows it feel with the piggyback uninstalled?

I haven't removed and tried again but definitely didn't notice it when stock.

It also happens when full throttle, not just kickdown, at rolling start.

Feels like the car is restricted. Like blowing through a straw half closed.

Wondering if a bungled dp and exhaust install could be the problem.

eksigned · 08-18-2020, 09:57 PM

Quote:

Originally Posted by misguided_will

Quote:

Originally Posted by eksigned

honestly, i'd also point fingers to the piggyback as well. hows it feel with the piggyback uninstalled?

I haven't removed and tried again but definitely didn't notice it when stock.

It also happens when full throttle, not just kickdown, at rolling start.

Feels like the car is restricted. Like blowing through a straw half closed.

Wondering if a bungled dp and exhaust install could be the problem.

Are you sure it's not throttle closure because of
torque limitations from the trans?

05-29-2020, 10:01 AM	#1
misguided_will Second Lieutenant 57 Rep 299 Posts Drives: 2018 BMW 340i M Sport Join Date: Jan 2009 Location: Sydney iTrader: (0)	Kickdown problem Hi all When I kickdown either from standstill or when rolling the car feels like it's struggling and doesn't go. Feels like it's being held back whereas I'm expecting it to just take off. Can only has a Dinan elite, cat back and CAI. Is this fuel cut or something else? Car is relatively low mileage. 17000 km. Never really driven hard until recently when testing the dinan Ideas? __________________ 2018 F30 BMW 340i M Sport Injen EVO intake, OEM 437m rims, Catted VRSF dp, Magnaflow catback, Activ8 piggyback, Pedalbox. Last edited by misguided_will; 08-14-2020 at 09:15 AM..
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05-30-2020, 04:37 AM	#3
davidr3 Captain 448 Rep 909 Posts Drives: 335i Join Date: May 2019 Location: Riverside iTrader: (1)	Is it leaking boost at all? Check CAI and make sure that's secure too. If you're stumped i'd probably try logging a few runs and posting them here. I'd also check CP for whatever reason if that came lose when working on other components. Try checking the car for shadow codes too.
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06-04-2020, 04:34 AM	#6
CrushJelly Private First Class 102 Rep 128 Posts Drives: M140i Join Date: Dec 2016 Location: Australia iTrader: (0)	What drive mode are you in? I'd wager that it could be Traction Control kicking in. Try the same in DSC OFF mode.
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06-14-2020, 09:10 PM	#8
misguided_will Second Lieutenant 57 Rep 299 Posts Drives: 2018 BMW 340i M Sport Join Date: Jan 2009 Location: Sydney iTrader: (0)	Tried it out again and seemed ok. Not sure why it was playing up so thanks for all the tips guys.
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08-14-2020, 09:19 AM	#9
misguided_will Second Lieutenant 57 Rep 299 Posts Drives: 2018 BMW 340i M Sport Join Date: Jan 2009 Location: Sydney iTrader: (0)	I never had this problem in my 435i which would rip hard in all drive mods. Is there some differences in the lcis and b58 to preemptively hold the engine back from revving up quickly like it should?
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08-14-2020, 09:59 AM	#10
BMWILUVU Lieutenant Colonel 809 Rep 1,597 Posts Drives: 340ix Join Date: Mar 2017 Location: The Boibs iTrader: (0)	There are protections in place and maybe Dinan did not run their tuning against a scenario where the sudden kickdown was used. I would call Dinan.
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08-14-2020, 07:48 PM	#11
Wires Brigadier General 1646 Rep 4,876 Posts Drives: 2016 340i xDrive Join Date: Apr 2008 Location: Calgary iTrader: (0)	I'd say you are having wheel slip. Have you tried what others have said about turning DSC off or trying sport+?
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08-18-2020, 10:33 AM	#12
eksigned Lieutenant 139 Rep 467 Posts Drives: 4er Join Date: Oct 2011 Location: WA iTrader: (0)	honestly, i'd also point fingers to the piggyback as well. hows it feel with the piggyback uninstalled?
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