Hi Jim et al.
Any ideas regarding the use of a Spitfire (Mk 1 to Mk 3) diff together with
a GT 6 (Mk 1) engine and o/d gearbox from a 2000 or 2500 saloon? Good idea /
bad idea?
Kind regards.
Chris de Wet .
PO Box 472 , Ifafi , 0260 , South Africa .
'56 TR 3 . '64 Spitfire 4 (Mk 1) . '67 GT 6 (Mk 1) .
" Triumphs are meant to be driven .... keep them on the road "
-----Original Message-----
From: Jim Muller [mailto:jimmuller@pop.mail.rcn.net]
Sent: Thursday, 28 August, 2003 10:34
To: triumphs@autox.team.net
Subject: Re: Spitfire O/D GT-6 O/D More Info.
On 28 Aug 2003 at 13:58, Douglas Frank wrote:
> And, the speed gear ratios are wrong.
Which calls to mind another thing to consider. In the Spitfire, cars
with OD had the same diff as those without OD, so the OD gave you a
higher gear for the highway and a bit more shifting versatility. On
the GT6 they did things differently. (Lemme' see if I can get this
straight.) Cars destined for non-US had the same diff (3.27:1) with
or without OD, which gave "ridiculously high gearing". US OD cars
had a lower (numerically higher, 3.89:1) diff, so you ended up with
similar highway rpms but lower gearing when OD was off, which
translated into slightly better acceleration and lower shift points.
Now, if you do your own OD swap you don't have to follow these rules,
of course. But you probably won't be able to use factory-standard
components such as speedo drive and such. Instead, you'll have to
find your own solutions. As Doug pointed out, at the very least your
gears will be way too low. So you'll probably want to swap the diff
to something geared higher, which will change the speedo readings
too. Seems like it would be easier to find a GT6 OD gearbox (or
convert your own) and go with the Euro-style high gearing.
--
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire, '70 GT6+
"This e-mail is sent in terms of the following policy/disclaimer. Click on
this link http://www.sapo.co.za/mail_disclaimer.htm to read full
disclaimer."
/// triumphs@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|