Edd,
OK, I'm following. You were describing it's limit as a % of the
total drivetrain rating. While I personally wouldn't take the risk,
it could probably go higher, as the inertia of the MG at a standstill
would be far less load on the system than a heavier car. T-5
transmissions, rated at ~230 ft-lbs in Ford Mustangs have handled well
over 300 ft-lbs in MGs and light kit-cars.
V/R
James
edd.rogers@GM.COM wrote:
James, In an AWD vehicle there is a central differential that doles
out the power to front and rear of vehicle. Typically there is 60%
alloted to the main axle and 40% to the secondary. If the
vehicle's basic design is FWD then the majority of power goes to
the front axle. So, all I am saying is that one needs to exercise
due diligence before going forward. If the rear diff is only
designed for 40% then it probably will be massively overstressed if
100% of the torque is applied since the V-8 at least makes similar
torque to the Rendezvous' engine. This would be bad. In research
on internet it appears that it is a varaible system that will allow
up to 70% of torque to a particular axle so not as bad as I was
thinking initially. The engine used made about 250 lbs/ft so, you
are within design when no more than 175 lbs/ft go to the rear diff.
There is probably a safety margin built in of some amount. I just
don't want to see someone go to all the work and R &D and then blow
the diff.
Edd Rogers
A Unistaff employee representing General Motors
Sales Engineer
MD Business Center
31 E Judson St
Pontiac MI 48342
Ph: 248.874.3503
"James J." <m1garandusa@verizon.net>
01/12/2009 07:36 PM
To
edd.rogers@gm.com, mgb-v8@autox.team.net
cc
Subject
Re: [Mgb-v8] [Mgs] Miata rear end
Edd,
What does that mean? That one has to de-rate the drivetrain's
max
safe torque rating by 40% when calculating if it is strong enough
for
the MG, or are you describing some kind of clutch mechanism in the
input
of the rear differential that decouples/unlocks above a certain
torque?
If it's the former, we would also have to take in account the
MG's
light weight vs. a Rendezvous (~2500lbs vs. ~5000(?)).
T-5 transmissions are typically rated at a much lower torque than
they
can actually handle in a British car.
Does anyone know if it shares internals with another common
design?
V/R
James.
edd.rogers@gm.com wrote:
> I don't believe that the Rendezvous rear is capable of full
torque. It is
> an AWD based off FWD set up. I think it only is designed for
about 40% of
> torque.
>
>
> Edd Rogers
> A Unistaff employee representing General Motors
> Sales Engineer
> MD Business Center
> 31 E Judson St
> Pontiac MI 48342
> Ph: 248.874.3503
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