RE: Anyone using a aftermarket fuel boost valve?

[Aleksander Mierzwa <alex@matrix.com.pl>]

Gerard,
Please, don't think that I'm flaming you, treat it just like a piece of
good advice.
It seems that you are just trying to put as much as possible "bells and
whistles" into your car without even thinking how they work or if
they're really needed. I'm also getting the impression that you believe
in everything you read in ads. "to give more fuel pressure..." "It
increases power and acceleration, cause it just feeds more fuel...".
Bu***it. Supplying more fuel does not make you go faster. It makes your
engine run rich, actually _hurting_ the performance. To make your engine
run efficiently and at top of it's performance you need the fuel to air
ratio to remain in a specified range. Ideal ratio is, if memory serves
me correct, 14.7:1 and is called "stechiometric ratio". It is sometimes
altered a little depending on engine's operating conditions. The
injection map can be reprogrammed in the process of "tuning" the engine
to make engine run a _little_bit_ richer at full throttle, you'll never
get much power increase that way, though. And it's accomplished by
simply reprogramming the stock ECU, no need for aftermarket controllers
for that. As you see, the key to increasing the performance is to
increase the _mass_ of _air_ entering the engine. It can be done by
several methods, the ones that are most useful to you are: making the
intake system less restrictive, increasing boost pressure (but remember
- the fact that you are running higher boost _does_not_ necessarily mean
that you are feeding more air) and increasing intercooler's efficiency
(yes - colder air mean more air).  Still the stock injection system is
good for 300HP or so. You'll never be able to use such power on a FWD
car, though. 

Aleksander Mierzwa
Warsaw, Poland
mailto:alex@matrix.com.pl
87 Audi 5000CS turbo (mine)
88 Renault Medallion wagon (mom's)
91 mountain bike (just in case both cars broke at the same time :-)

> -----Original Message-----
> From:	Gerard [SMTP:gerard@poboxes.com]
> Sent:	Monday, November 03, 1997 1:15 PM
> To:	quattro list
> Subject:	Anyone using a aftermarket fuel boost valve?
> 
> Hi!
> 
> I'm asking a whole bundle of silly questions these days. Here's
> another one.
> 
> Has anyone fitted an aftermarket fuel regulator/boost valve? These
> replace the stock fuel regulators and are used to give more fuel
> pressure as needed. I'm looking at one made by FSE. It smooths out
> flat spots, increased power and accelleration 'cos it just feeds more
> fuel. Supposedly it is quite good, works better for turbos than for
> normally aspirated vehicles. I'm thinking of putting it on my list of
> future mods to do to my 1990 200T. So has anyone here fitted such a
> thing in place of the normal accummulator/regulator on 200T? If you
> have then I'd like to hear what you think of it? Oh yes, I'm not
> talking specifically about the FSE model, I'd like to hear from
> anyone who has any sort of aftermarket power valve.
> 
> Thanks.
> 
> Cheers!
> 
> G.
> -- 
> "a thousand miles from here, there is another person smiling"
> name   : gerard van vught
> tel    : +27-57-912 2658 (w) / 082 923 9609 (cell)
> url    : http://www.acenet.co.za/homepages/gerard/
> e-mail : gerard@poboxes.com  / han.solo@galaxycorp.com
>          gerard@acenet.co.za / van_vught@frg.issi.co.za
>