Re: [DML] Continued: Renault Input Shafts

[Martin Gutkowski <webmaster@xxxxxxxxxxxxxx>]

Ok, I'm not going to go beyond this message. Bill, You can believe what 
you like. I _have_ an "Alpine" engine to fit into my DeLorean. I write 
that in inverted commas because what I have is a Renault 25 turbo 
engine, which has a slightly different crank case (interchangable with a 
DMC's) and different intake pipework (which is nothing more than a 
couple of pipes which are a different shape on the Alpine).

You have clearly had very little experience with after-market tuning. I 
won't pretend I do, however I have several friends who have, and I'm 
learning as much as I can at the moment, and I'll begin by replying to 
your last point. Quote "250 HP is the more reliable number. You're going 
to be very hard pressed to get much more than that from a 3 liter 
gasoline engine, even turbocharged." - this is complete and utter 
nonsense. I've ridden in several fast cars - a Subaru Impreza Turbo (WRC 
champion several years running) which has a twin turbo 2-litre flat 4 
and my friend's puts out over 330hp. Another friend's Nissan Skyline 
with a single turbo 2 litre strait 6 putting out nearly 400hp. (and the 
modern 2.6 litre twin turbo equivalent can be tuned to over 600hp). I've 
also got a friend with a 550 hp 6 litre V12 normally aspirated 
Lambourgini Diablo, who also took me out in the Gallardo he had as a 
loan car recently..... and the Skyline is quicker than all of them.

Just because Renault tuned these cars to 250hp out of the factory, 
doesn't mean they aren't capable of a lot more. The top end that should 
be considered for boost is 20psi. Purely in air flow alone, you're 
talking equivalent displacement of over 7 litres (rough maths) - in an 
engine capable of 7000rpm. It doesn't matter how much torque you put 
through the gearbox, as long as the ratio is such that the tyres let go 
before you reach the limit of the gearbox, you won't break anything 
apart from traction.

I've also delved into the engine management on the Z7U and suffice to 
say that this is one area where Renault really were the envy of the 
world, in the mid 80's they were mapping these engines to a level of 
detail that even Cosworth could only dream of. And that's my final word 
on the subject: I was taken for a spin in a Sierra Cosworth last week. 
That's about 300hp from a 2 litre single turbo inline 4.

Martin


content22207 wrote:

>This same topic (Alpine HP) apparently made it way through the DML
>several times in 1998 with the same conclusion: 250 HP is the more
>reliable number. You're going to be very hard pressed to get much more
>than that from a 3 liter gasoline engine, even turbocharged.
>
>Bill Robertson
>#5939
>





To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/dmcnews/

<*> To unsubscribe from this group, send an email to:
     dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/