Re: [DMCForum] Turbo
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Re: [DMCForum] Turbo



Hi Dick

Here's the thing: I talked my good friend into buying a twin turbo 
before I knew anything about them. He is actually the person responsible 
for "finding" Darren Bowker. A long time Renault mechanic, kit car 
builder, owner (and breaker) of several Renault 30's, and consours 
competitor with his own R30, Darren was able to supply Rich with a 
required crankshaft pulley. When I got my project car with a blown 
engine, I gave the job to Darren to build me one. As a consequence, 
Darren found out all he could about the DeLorean version of the PRV. 
We've benefitting from this knowledge a very great deal now!

But back to Rich. His engine was pretty much in pieces when the car 
arrived. it's doubtful the engine ever ran with the Turbos before it 
left the US.The engine was stripped down to the block to do the head 
gaskets, and on rebuild, the turbo kit was assembled as per Island 
instructions, supplied by Dave Stragand.

However. Rich's car has never even been as fast as a stock DeLorean 
automatic. His turbos are set to 5psi which according to Darren is as 
high as they should be set without at least low compression pistons. We 
kept trying to get Darren to explain what we could do with the engine, 
and what might be wrong, and his answer was always along the lines of 
"get a different engine, if you want a turbo engine, get an engine that 
was designed for it in the first place". However we finally managed to 
pin him down over it by pointing out that it should at least be faster 
than a stock engine. Which it isn't. So finally we've started to get 
answers, some of which provide a fascinating new path for fuel 
enrichment under boost, timing curves, you name it. He agreed that the 
engine should be able to produce more than it is.

Thanks to Gary (checksix3) I now have a better understanding of the CPR 
and accelleration enrichment systems on the DeLorean engine (basically 
there isn't any). The mickey-mouse method of disconnecting the lambda 
sensor under boost is limited to say the least, but I'm looking forward 
to playing with Rich's engine son and seeing if we can't fiddle the vac 
enrichment on the CPR to deliver a nice amount of fuel proprtionately 
under boost. Then the only problem left is the ignition, whre welding up 
the bob-weights and going for Emerald EFI and having it mapped ona 
rolling road will be the answer. Then it's a Milford K-Star for proper 
mapped fuelling

They weren't meant for it, are a bad bit of engineering, but provide a 
lot of fun for a tinkerer like me!

Martin

Dick Ryan wrote:

>Martin
>
>I was shocked (pleasantly) to see your begrudging,
>semi-complimentary comments about a turbo'd DeLorean. 
>
>
>Having owned two twin turbo equipped D's and having
>put over 100K on them driving in all sorts of
>conditions here on the wrong side of the pond, I can
>tell you that they are great fun.  Heck, they might
>even provide more thrills than your 170HP.    
>
>In "proper" tune, you should easily get 187-192 HP. 
>So, 200 should not be hard to do.
>
>Disadvantages?  Of course, no coin has only one side. 
>They do have to be taken care of and an occasional
>rebuild is in order.  But, properly serviced, even
>that is very infrequent - I've had ONE rebuild.  And,
>engine has never apparently suffered from 7-7.5 lbs.
>of boost.
>
>Not to start any long dissertation, just glad to see
>you've got a twin turbo to play with.
>
>Dick
>
>  
>





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