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Re: [T3] Fuel pump refurbishment

On 19 Dec 2002 at 10:01, Earthman? wrote:

> > > One of our conversations here a few years ago taught me that this is 
> > > occasionally a good idea, only a couple of psi, though, and only when you 
> > > understand why it is okay in this particular case.
> > > 
> > 28-32 psi max. I have never had to set one higher than 32 on a stock
> > 1600, and that is even on my own car.

If you go up to 1776 from 1594 that is an increase of 

(1776-1594)/1594 = 11.4% so I believe that you would want to increase the fuel 
pressure by the same percent, which would put you at something like 32-33 psi. 
I THINK this should work out just about right in normal driving, but the FI may 
do something special at idle which might give problems. If you do more than 
just increase displacement, like anything that improves the breathing then this 
also has an effect, too.

For larger displacements and cams and porting you would need more pressure, but 
you would probably also run into more problems at the extremes (idle and full 
throttle) so it's hard to know when things would get annoying.

I've never done any of this, except porting, so I can't make any suggestions 
from experience. I haven't changed anything when I ported my heads, but I think 
I should increase the fuel pressure about 1 psi.

Jim Adney
Madison, WI 53711-3054

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