| ||||||||||||||||||||||||||||||||||||||
| ||||||||||||||||||||||||||||||||||||||
|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: Reprogramed GM400
Michael wrote:
<< Does anyone know the specifics? What exactly was done, and what were
the benefits? >>
The Factory modified GM400 came as standard on the 6.0L XJR-S from '89
to '93 Part no. SPE 1027.
The owners handbook say "JaguarSport modified shift points" In my car
('89) I would consider under normal driving the shifts to still be quite
soft, under hard acceleration they are by no means harsh, but seem to be
a little quicker.
From what I can remember the shift speed points are not much different
from my previous car '88 V12 XJ-S. However, what is noticeable is it's
ability while in drive to kickdown into first at higher road speeds,
(up to about 38-40 mph) this is quite useful.
I may be wrong here, but I *think* Jaguar revised the tranny a few times
throughout its history My '88 car shifted much faster with less "slurr"
than my friends '84.
Getting off the subject a bit here, anyone have any experience of the
overdrive units manufactured by American Overdrive Inc. designed for
autoboxes, GM400 included ? This effectively changes your GM400 into a
six speed.Have not heard this mentioned on the list before, any comments
?
Two possibilities here would give much better acceleration The unit can
be supplied with the internals reversed so you have underdrive first,
underdrive second and underdrive top. Or install a lower axle ratio and
leave the overdrive in and switch it out for "sport Mode".
John Goodman
'89 Jaguar Sport XJR-S 6.0L
'88 Range Rover
'84 VW Camper
|
                           
| ||
 |
Improve your Jag-lovers experience with the Mozilla FireFox Browser!
  View the latest posts from our Forums via an RSS Feed!
 ©Jag-loversTM Ltd / JagWEBTM 1993 - 2024 All rights reserved. Jag-lovers is supported by JagWEBTM For Terms of Use and General Rules see our Disclaimer Use of the Jag-lovers logo or trademark name on sites other than Jag-lovers itself in a manner implying endorsement of commercial activities whatsoever is prohibited. Sections of this Web Site may publish members and visitors comments, opinion and photographs/images - Jag-lovers Ltd does not assume or have any responsibility or any liability for members comments or opinions, nor does it claim ownership or copyright of any material that belongs to the original poster including images. The word 'Jaguar' and the leaping cat device, whether used separately or in combination, are registered trademarks and are the property of Jaguar Cars, England. Some images may also be © Jaguar Cars. Mirroring or downloading of this site or the publication of material or any extracts therefrom in original or altered form from these pages onto other sites (including reproduction by any other Jaguar enthusiast sites) without express permission violates Jag-lovers Ltd copyright and is prohibited |
|
