Re: [DMCForum] Turbo Bosch X-Jet?

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

Hi Dave

> Ah, but then it would be better to reinvent the air flow path than the 
> fuel
> injection system.  Assuming I go with a Porsche 930-type setup, I'd much
> rather have the turbos push through the throttle plate than straight into
> the manifold sides.  

Excellent, glad to hear it - this will of course mean you'll need a dump 
valve but you won't be blowing oil seals on the turbos either.

> I have no problems re-piping this, since I am going to
> be putting in twin air-to-liquid intercoolers anyway.  

You too? :-) They're called Chargecoolers BTW and pioneered by Lotus. I 
don't know if you've seen the photos of matie who's dropped an Esprit V8 
in his D - he's done chargecoolers too but the placement of his pre-rad 
is totally wrong (IMO). I've already had a pre-rad made that mounts 
behind the front grill - there's anough room there for a pre-rad about 
twice the size of the Lotus ones. Would you like to buy one? :-) I'm 
going to be going to Pace products for a 4 core chargecooler and 
probably twin 2-core coolers for the esprit V8 we're doing.

http://www.paceproducts.co.uk/

> Again, not
> reinventing the wheel, what do you think of a Legend-type V design?

I like it - and in fact it could have been made for the Renault turbo 
PRVs because the throttle body sits directly in the middle pointing up. 
The only snag is the length of pipwork - are you going to turn the 
turbos around?

>
> Assuming that I do change the airflow path as you mentioned, do you forsee
> any issues using the Porsche K-Jet setup?  It's also a 3.0l engine btw.

I am not the expert here but I can certainly put you onto a man who is. 
The theory is sound. You'll probably find that a trip to a rolling road 
with some primary pressure regulator shims will allow you to fine-tune it.


> Oh, and I'm fortunate enough to have the only J&S spark controller in the
> new design.  Mine was the last he made if I understand correctly.  That's
> another reason why I would like to stay with as much of the current 
> setup as
> possible.

Though you do realise that setting the timing on the knock sensor is a 
ham-fisted way of doing things to say the least....

BTW the TEC3 does support electronic ignition for an odd-fire engine. 
You could weld up the bob-weights in the dizzy and simply run the ecu 
"in the background" - it'd all look exactly the same.

Martin

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