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Re: [T3] FI on a big engine


On 3 Sep 2002, at 21:06, Hal Sullivan wrote:

> 9/3/2002 6:21:39 PM, "Keith Park" <topnotch@nycap.rr.com> wrote:
> 
> >You can go 1776 with the stock D jet and a little extra fuel pressure...
> >perhaps 1835... Keep the Cam stock or very mild.
> 
> ...why not go to 1915 or 2007 and use the 2.0L 914 injectors?

What makes you think that the injectors will make up the difference? Do we 
have any data to support the conjecture that they flow any more fuel than the 
type 3 injectors? Do we know the flow rate ratio?

What about the pressure sensor? What about the brain? What about the 
intake air runners and head flow?

All these things work together to make a system tuned to work with a certain 
engine. If you stick with the original type 3 FI parts you know that you have a 
system which matches and the ONLY question is whether that system has 
sufficient dynamic range to accomodate more flow. In fact, I think I could 
prove that with the original system you could adjust it for larger displacement 
by adjusting only the fuel pressure. Once you start changing other parts you 
make the picture much more complicated and you have reduced your odds 
of success to a totally random event.

OTOH, if we know the ratio between the flow rates for the various injectors, 
we should be able to figure out which combination of fuel pressure and 
injectors would work with any particular displacement. Anybody got some 
spare injectors from another system?

-
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA

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