[Diy_efi] Intake manifold flow testing

[Hugh Keir]

This is a big problem on tuned GTR skylines.

There are several aftermarket plenums available but it is hard to judge
their effectiveness.

Simple fixes are to flow test your injectors and fit the richest at the
rear, also to increase the injector duration on injector 5 and 6 if the ECU
allows it.

Hugh


----- Original Message -----
From: "Lasse Langwadt Christensen" <langwadt at ieee.org>
To: "List for general do-it-yourself EFI talk" <diy_efi at diy-efi.org>
Sent: Friday, February 14, 2003 4:41 PM
Subject: Re: [Diy_efi] Intake manifold flow testing


> Grant Beaty wrote:
> > I've always heard the monentum of the air (there is a lot of velocity
going
> > thru the TB) causes it to not want to make a 90 degree turn into the
first
> > cylinder, and instead builds up pressure at the rear of the manifold.
Don't
> > know how true this is, its just what I've heard on other lists.
> >
> > Grant Beaty
> >
> snip
>
>
> not too long a goa there was a show about F1 on discovery, and they
> showed how a great deal of efford and simultion was put into an air bow
> design that would give an even distribution of air to the cylinders and
> not just ram it into those furthest back
>
> and I've heard that on some rallycross cars with right manifold
> design they can use as much as ½ a bar more boost before getting
> it problems with detonation. I assume, without knowing, that' got
> to do with getting an even mixture on all cylinders,
>
> -Lasse
>
>
>
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