Low rpm acceleration jerk

ahtim · 02-05-2018, 02:30 PM

Hi my csl is 28000miles, barely drive it, and recently when I drive it, during low rpm, 2k ish rpm, when I try to full throttle it, eg:6hear low rpm full throttle, it jerks once at 2k ish rom to 3k rpm, any idea please, when it goes over hat, it is perfectly fine.

Thanks

Will

**Mike R** · 02-05-2018, 03:30 PM

Has the induction flap been removed?

ahtim · 02-05-2018, 04:26 PM

Strangely, it’s gone after Reving it few times. But for the flaps, no, it is fully stock, and Bmw did all the service. My last service I think it’s 2 years ago

**Mike R** · 02-05-2018, 04:47 PM

Probably just needs an "Italian tune-up"

.

ahtim · 02-05-2018, 05:26 PM

My car is fully stock on cup 2 , but I still do feel the body roll on the corners, especially on the S turns, do you guys upgrade the anti roll bar or the suspensions? I have ohlins on my 1m, and I love the quality, any you guys using it on csl?
Thanks,

select · 05-05-2018, 03:21 AM

In my opinion its best not to accelerate in such low rpms and in such a high gear, the csl has rather sharp camshafts and it in general doesnt like that. In my opinion its best to not go below 3000RPM for hard accelerations.

If it still happens on moderate acceleration then it sounds like the Vanos is not up to speed. If you have DIS you can carry out a Vanos test and go from there.

Re the flap, the car works the same with flap removed. If at all, it is slightly more prone to hesitate under those circumstances. I have proven in the past that the flaps sole reason is to meet EU noise emissions.
It was added in the last minute by BMW. The car was designed without a flap in place.

Trawler · 05-05-2018, 08:21 AM

What select says. Keep the revs up. When I forget to change down after cruising to pass something easily I get the occasional jerk. Happens in 5/6th gear at around 2500-3000 rpm.
Done it ever since I bought the car over 12 years ok so I should know better by now.

02-05-2018, 02:30 PM	#1
ahtim S2 - Picking it up Join Date: May 2011 Location: Hong Kong Posts: 45 Casino cash: $1066	Low rpm acceleration jerk Hi my csl is 28000miles, barely drive it, and recently when I drive it, during low rpm, 2k ish rpm, when I try to full throttle it, eg:6hear low rpm full throttle, it jerks once at 2k ish rom to 3k rpm, any idea please, when it goes over hat, it is perfectly fine. Thanks Will

02-05-2018, 03:30 PM	#2
Mike R S6, Sport On, Traction Off Join Date: Dec 2010 Location: Norwich Posts: 1,582 Casino cash: $17548	Has the induction flap been removed? __________________ Mike R Sarcasm is just a free service I provide. Nordschleife, there's only two barriers to worry about - the ones on the left and the ones on the right . CSL number 044

02-05-2018, 04:47 PM	#4
Mike R S6, Sport On, Traction Off Join Date: Dec 2010 Location: Norwich Posts: 1,582 Casino cash: $17548	Probably just needs an "Italian tune-up" . __________________ Mike R Sarcasm is just a free service I provide. Nordschleife, there's only two barriers to worry about - the ones on the left and the ones on the right . CSL number 044

05-05-2018, 03:21 AM	#6
select S5 - Full Throttle Join Date: Oct 2014 Location: Germany Posts: 475 Casino cash: $6813	In my opinion its best not to accelerate in such low rpms and in such a high gear, the csl has rather sharp camshafts and it in general doesnt like that. In my opinion its best to not go below 3000RPM for hard accelerations. If it still happens on moderate acceleration then it sounds like the Vanos is not up to speed. If you have DIS you can carry out a Vanos test and go from there. Re the flap, the car works the same with flap removed. If at all, it is slightly more prone to hesitate under those circumstances. I have proven in the past that the flaps sole reason is to meet EU noise emissions. It was added in the last minute by BMW. The car was designed without a flap in place. __________________ Greetings, Julian. Last edited by select; 05-05-2018 at 03:25 AM.

02-05-2018, 04:26 PM	#3
ahtim S2 - Picking it up Join Date: May 2011 Location: Hong Kong Posts: 45 Casino cash: $1066	Strangely, it’s gone after Reving it few times. But for the flaps, no, it is fully stock, and Bmw did all the service. My last service I think it’s 2 years ago

02-05-2018, 05:26 PM	#5
ahtim S2 - Picking it up Join Date: May 2011 Location: Hong Kong Posts: 45 Casino cash: $1066	My car is fully stock on cup 2 , but I still do feel the body roll on the corners, especially on the S turns, do you guys upgrade the anti roll bar or the suspensions? I have ohlins on my 1m, and I love the quality, any you guys using it on csl? Thanks,

05-05-2018, 08:21 AM	#7
Trawler Driving it like I nicked it Join Date: Dec 2008 Posts: 2,213 Casino cash: $25916	What select says. Keep the revs up. When I forget to change down after cruising to pass something easily I get the occasional jerk. Happens in 5/6th gear at around 2500-3000 rpm. Done it ever since I bought the car over 12 years ok so I should know better by now.