Converting my 635 CSI Highline from auto to manual.
Have all the necessary bits, but when it comes to a flywheel I have two choices....standard manual M30 flywheel or a lightened version.
The lightened version has been cleaned and skimmed to 6.6kgs (14.55lbs)
The car is basically my Sunday car and is really only used for occasional 'spirited' driving and a yearly high speed trip to Lemans. It is not used around town or as a main car.
The car has recently had a Fritz Bits manifold and stainless exhaust system fitted as well as the ECU remapped and retuned by Rich at Fritz Bits, I think it has gained about an extra 15 - 20 bhp.
Anybody on here had experience of a flywheel lightened to 14.55lbs....I read somewhere that this was a good weight for the M30 engine.
I am concerned that it might affect low speed drivability and give a lumpy tickover ?
Any comments ?
Optimum Flywheel weight
Moderators: GRNSHRK, ron, bfons
-
- Posts: 247
- Joined: Mon Aug 01, 2011 2:18 pm
- Location: Hampshire UK
- 86_6series
- Platinum Member
- Posts: 1073
- Joined: Mon Apr 02, 2007 10:08 pm
- Location: West Nyack, NY
Re: Optimum Flywheel weight
I think for street driving 14.55 is way to low. For the track it would be ok, but
for the street you'll always need higher revs to get moving.
17 to 18 lbs. would be my recommendation.
for the street you'll always need higher revs to get moving.
17 to 18 lbs. would be my recommendation.
86-635CSi
96-MB C220 SOLD
98-740i
71-Continental MK3
96-MB C220 SOLD
98-740i
71-Continental MK3
Re: Optimum Flywheel weight
Like I already said is not a problem. I haven't had any issues. Its not like it's a super lightwight aluminium racing job
'85 635csi JPS (RA2-66)
Re: Optimum Flywheel weight
14 lbs. is about the weight of a 533i/M5 flywheel, which some guys use vs. the stock 535/635 flywheel which weighs about 22 lbs. Most consider it an upgrade; you'll probably like the way the engine revs up more quickly. I'm using one and both the idle quality and low speed response are fine.
1985 635CSi
1987 535is
1965 Impala SS
1987 535is
1965 Impala SS
-
- Platinum Member
- Posts: 3320
- Joined: Thu Sep 28, 2006 9:28 pm
- Location: scottsdale, arizona
- Contact:
Re: Optimum Flywheel weight
My 81 Euro 635 with a dogleg trans has a 17#er That is really supposed to be the desirable one from all of the posts I have read over many years. Use the search function and see what comes up
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.
flickr.com/photos/bertsphotos.
Re: Optimum Flywheel weight
i run a 12lb flywheel in my m635csi. low speed function is fine and it revs up really nice
BMW’s
84 E24 M635csi
90 E34 M5 3.6
94 E34 540i/6 SC E85
97 E36 M3 euro SC U/C
97 Z3 2.8 widebody
OTHERS
11 Audi S5 3.0 SC
19 VW Amarok V6
84 E24 M635csi
90 E34 M5 3.6
94 E34 540i/6 SC E85
97 E36 M3 euro SC U/C
97 Z3 2.8 widebody
OTHERS
11 Audi S5 3.0 SC
19 VW Amarok V6