5 speed box (Again!)
22 posts
• Page 2 of 2 • 1, 2
Post by: stugilmour » Thu Oct 29, 2015 4:14 pm
Point taken, and might just be a bit of confusion between lower vs numerically lower? Isn't 3.54 (11/39) / 3.55 (9/32) the 'tallest' commonly available ratio for the stock Lotus diff? Not sure what is available for the replacement Ford units the Zetec guys use.
Stu
Stu
Stu
1969 Plus 2 Federal LHD
1969 Plus 2 Federal LHD
-
stugilmour - Coveted Fifth Gear
- Posts: 1942
- Joined: 03 Sep 2007
Post by: l10tus » Thu Oct 29, 2015 4:43 pm
Vince,
I think Stu is correct.
Seems the 3.54 is the highest available.
I too am searching for the Grail !
Lotus were obviously trying to address this issue by fitting the highest one available.
If it were available, would a higher ratio be restricted by physical size anyway (in the Ford unit)?
I wonder if we have to look elsewhere - perhaps other manufacturers?
Or is it the 4 speed box that is the overriding issue here?
Gearing is Just too low!
(Can't believe it has gone so many years without being addressed !)
Regards,
Phil.
I think Stu is correct.
Seems the 3.54 is the highest available.
I too am searching for the Grail !
Lotus were obviously trying to address this issue by fitting the highest one available.
If it were available, would a higher ratio be restricted by physical size anyway (in the Ford unit)?
I wonder if we have to look elsewhere - perhaps other manufacturers?
Or is it the 4 speed box that is the overriding issue here?
Gearing is Just too low!
(Can't believe it has gone so many years without being addressed !)
Regards,
Phil.
Philip.
UK '72 Sprint DHC
Sometimes my Lotus makes me cry.
UK '72 Sprint DHC
Sometimes my Lotus makes me cry.
-
l10tus - Third Gear
- Posts: 476
- Joined: 10 Apr 2008
Post by: msd1107 » Thu Oct 29, 2015 5:53 pm
I vaguely remember 3.44 being homologated, but have never seen it. Probably for use at Le Mans.
Gary Anderson at one time proposed having a special diff ratio of around 3.2 made, which would give a top gear approximately the same as the T9 5th speed. This would require using the wide ratio 4 speed in order to be viable on the street.
Most of the 5 speed conversions have a 5th gear between .87 and .8 which is useful with the normal differential ratios of 3.55, 3.77, or 3.9 depending on whether you have a FHC, DHC and the state of engine tune and what revs you want at your normal cruising speed.
David
1968 36/7988
Gary Anderson at one time proposed having a special diff ratio of around 3.2 made, which would give a top gear approximately the same as the T9 5th speed. This would require using the wide ratio 4 speed in order to be viable on the street.
Most of the 5 speed conversions have a 5th gear between .87 and .8 which is useful with the normal differential ratios of 3.55, 3.77, or 3.9 depending on whether you have a FHC, DHC and the state of engine tune and what revs you want at your normal cruising speed.
David
1968 36/7988
-
msd1107 - Fourth Gear
- Posts: 770
- Joined: 24 Sep 2003
Post by: elj221c » Thu Oct 29, 2015 9:22 pm
l10tus wrote:Gearing is Just too low!
(Can't believe it has gone so many years without being addressed !)
It's probably because you are probably the first to raise such a question except where motorway/freeway cruising is concerned.
Around 3750ish rpm at 70mph. Travelled all over at that and sometimes flat at 7k.
The gearing was suitable for the time and still is for most.
As someone else has intimated on the other thread, perhaps you are not the 'ideal' Classic Lotus owner.
To paraphrase: "Give it up".
Roy
'65 S2
'65 S2
-
elj221c - Fourth Gear
- Posts: 539
- Joined: 12 Sep 2003
Post by: john.p.clegg » Thu Oct 29, 2015 10:23 pm
"Bring back the horse and cart",that's what I say.......
John
John
-
john.p.clegg - Coveted Fifth Gear
- Posts: 4533
- Joined: 21 Sep 2003
22 posts
• Page 2 of 2 • 1, 2
Total Online:
Users browsing this forum: No registered users and 7 guests
Site map
SitemapIndex
RSS Feed