E46 Rev-Matching On Upshift
Discussion
So.. Lets say my car is at approx. 70 degrees celsius (coolant), and I rev up to in 1st to get into 2nd, the RPMs fall quite quick and I don't really know how/when to release the clutch to get that rev-match good if you know what I mean.
But whenever the oil warms up, I get a good bit of rev hangs, so I have time to shift, and then start slipping the clutch, but it always ends up as either me letting go to early and it bucks it down, or either too late and it's all shakey and rough. Any help please?
2002 316i N42B18A (DOHC Engine)
But whenever the oil warms up, I get a good bit of rev hangs, so I have time to shift, and then start slipping the clutch, but it always ends up as either me letting go to early and it bucks it down, or either too late and it's all shakey and rough. Any help please?
2002 316i N42B18A (DOHC Engine)
As I have said before, try clutch-less gear changes to improve rev matching. That will teach you about loads on gears and synchromeshes. Try on up and down changes.
So, lift off, pull/push lever out of gear into neutral. This will teach you the revs going out of gear that will minimise load on gear teeth, to enable the out-of-gear disengagement. In neutral, rev-match to the gear you are moving to, and pull/push gear lever to that gear, the synchromesh will baulk the change unless the revs are matching sufficiently.
So, lift off, pull/push lever out of gear into neutral. This will teach you the revs going out of gear that will minimise load on gear teeth, to enable the out-of-gear disengagement. In neutral, rev-match to the gear you are moving to, and pull/push gear lever to that gear, the synchromesh will baulk the change unless the revs are matching sufficiently.
Thing is, I can't down-shift rev-match because my throttle response is bad. (Either the MAF is bad or something else) i blip the throttle and it's iffy. Instead of it going to like 1.4k RPMs, it goes to 1k or so and hovers, meaning blipping does like nothing.
- And clutchless shifting? What... you mean gear floating? It won't really help me.
Edited by Longitudinal4Cylinder on Sunday 27th May 16:32
aka_kerrly said:
i preaume even the non 6 cylinder bmws still have the clutch release delay valve fitted which is to help make s
t drivers good and good drivers appear like amateurs
Kinda smart of BMW, but does this mean I can't really rev-match unless It's a lucky shift?t drivers good and good drivers appear like amateurs I experienced this thing where i have to start letting go of the clutch early and then the clutch fully out about like 100 RPMs before the desired gear's RPM. Is this the clutch delay?
I’m not quite sure I understand the problem, but I have a solution:
I think perhaps you are granny shiftin' not double clutchin' like you should
On a more sensible note, as others have said try changing gear without using the clutch-this will allow you to get a feel for the gearbox
Re clutch delay valves, most BMWs have them, the name or a Google search explains what they do. According to the internet they are the work of the devil. I have no problems with them in 25 years of driving/owning/fixing BMWs.
Re throttle response on the N42/3/5/6 engines even when working perfectly none of them are renowned for their amazing throttle response. Why do you think your air mass meter is faulty?
If you want to improve your driving maybe take some advanced training, there are plenty of ex Police advanced drivers offering training. Going past the limits of grip is a different proposition and is best learnt on a track with a suitable instructor.
The E46 is a well balanced car thought the N series 4 cylinders are not BMWs finest hour.
I think perhaps you are granny shiftin' not double clutchin' like you should
On a more sensible note, as others have said try changing gear without using the clutch-this will allow you to get a feel for the gearbox
Re clutch delay valves, most BMWs have them, the name or a Google search explains what they do. According to the internet they are the work of the devil. I have no problems with them in 25 years of driving/owning/fixing BMWs.
Re throttle response on the N42/3/5/6 engines even when working perfectly none of them are renowned for their amazing throttle response. Why do you think your air mass meter is faulty?
If you want to improve your driving maybe take some advanced training, there are plenty of ex Police advanced drivers offering training. Going past the limits of grip is a different proposition and is best learnt on a track with a suitable instructor.
The E46 is a well balanced car thought the N series 4 cylinders are not BMWs finest hour.
helix402 said:
I’m not quite sure I understand the problem, but I have a solution:
I think perhaps you are granny shiftin' not double clutchin' like you should
On a more sensible note, as others have said try changing gear without using the clutch-this will allow you to get a feel for the gearbox
Re clutch delay valves, most BMWs have them, the name or a Google search explains what they do. According to the internet they are the work of the devil. I have no problems with them in 25 years of driving/owning/fixing BMWs.
Re throttle response on the N42/3/5/6 engines even when working perfectly none of them are renowned for their amazing throttle response. Why do you think your air mass meter is faulty?
If you want to improve your driving maybe take some advanced training, there are plenty of ex Police advanced drivers offering training. Going past the limits of grip is a different proposition and is best learnt on a track with a suitable instructor.
The E46 is a well balanced car thought the N series 4 cylinders are not BMWs finest hour.
Re throttle response, i can send you a video of how dodgy it is, if it isn't the MAF nor the throttle body, then what is it? I can guarantee you it isn't normal as i can't revmatch.I think perhaps you are granny shiftin' not double clutchin' like you should
On a more sensible note, as others have said try changing gear without using the clutch-this will allow you to get a feel for the gearbox
Re clutch delay valves, most BMWs have them, the name or a Google search explains what they do. According to the internet they are the work of the devil. I have no problems with them in 25 years of driving/owning/fixing BMWs.
Re throttle response on the N42/3/5/6 engines even when working perfectly none of them are renowned for their amazing throttle response. Why do you think your air mass meter is faulty?
If you want to improve your driving maybe take some advanced training, there are plenty of ex Police advanced drivers offering training. Going past the limits of grip is a different proposition and is best learnt on a track with a suitable instructor.
The E46 is a well balanced car thought the N series 4 cylinders are not BMWs finest hour.
Don't try clutch less shifting unless you know what you are doing.
Try resetting the drive by wire throttle. Key in, foot to the floor on the accelerator, turn ignition on (keep engine off, left foot off the clutch!) and hold foot down for 30 seconds. Turn off ignition and release accelerator. Then start as normal and the throttle response will be a little bit more keen.
You should also give it the beans when fully warm to blow out the cobwebs every now and again. Google Italian tune up.
Try resetting the drive by wire throttle. Key in, foot to the floor on the accelerator, turn ignition on (keep engine off, left foot off the clutch!) and hold foot down for 30 seconds. Turn off ignition and release accelerator. Then start as normal and the throttle response will be a little bit more keen.
You should also give it the beans when fully warm to blow out the cobwebs every now and again. Google Italian tune up.
thebraketester said:
Longitudinal4Cylinder said:
No throttle input on gear changes, that would only make things worse
How?(unlesd you mean revmatching like when rpm falls too low blip it and let go of clutch
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