Re: [DML] Re: Turbo PRV

[Martin Gutkowski - DMC Ltd <martin@xxxxxxxxxxxxxx>]

Hi David

I fear we may have locked horns over this one before so we'll have to 
agree to disagree on these points with reference to the 5 speed 
transmission. You're absolutely correct on the 3 speed. I am in contact 
with the guy who developed the upgrade UN1 gearset as well as 
engineering the ATB diff Quaife make. His esperience comes to this:

300hp no modifications, no problem
350hp you will start to break things - on the Esprit and GTA turbos, 
it's 5th, the DeLorean (and GTA Atmo / A310) has a shorter 4th and 5th, 
which to those guys, is a strengthened part!
400hp, input coupler (which Toby does).

Cases in point:

Alpine GTA V6 Turbo - 200hp from the factory, never heard of any 
transmission failures, stronger clutch
Alpine A610 - 250hp from the factory, same transmission, even stronger 
clutch
Venturi Atlantique 300 (single turbo) 281hp & 309ft-lbs of torque, same 
transmission, but final reversed for mid-engined layout
Lotus Esprit V8 TT, again mid-engined - these DO have a habit of 
breaking the transmission at 350+ hp.
The Venturi 400GT was raced at 400hp with a stock UN1 although fewer 
than 100 cars were produced.

Someone recently (and very rightly said) that it's torque that kills 
tranmissions, not HP and while the Island kit may peak at 200hp, does it 
really put out the kind of torque the GTA turbo or indeed the Legend 
engines did? I doubt it (and have experience of one such engine running 
5psi, before it was rebuilt with Renault turbo internals and have just 
assisted with a 3 litre GTA turbo putting out over 300hp at the wheels)

Best Wishes

Martin

David Teitelbaum wrote:

>Fred Dellis (of Legend Industries) told us at one of the DMC dinner
>events that they were able to get all the horsepower out of the engine
>that they needed. I can assume with extensive internal modifacations.
>The major limitation they faced was the trasmsission couldn't handle
>the power. Legend had to consider the ramifacations of their changes
>as far as how they would honor a new car warranty. They couldn't do
>all of the upgrades and have owners coming back in droves with
>warranty claims. They needed to have a durable powertrain. As an owner
>modifying his own car this is not as important but it is a fact of
>life that the stock trans will not live long with more than 200
>horsepower. This is why the Island kit was so popular. In it's base
>form it gives just under 200 horespower with no major internal
>modifacations. Any more and the motor and transmission won't last.
>IMHO a "proper" turbocharged Delorean needs different ratios in the
>transmission to get all of the performance that a turbo can offer. I
>would do that first before trying to increase boost and horsepower.
>There are other low cost ways to improve performance too, intercoolers
>and water injection are some of the ways.
>David Teitelbaum
>vin 10757
>
>  
>







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