Thanks for the reply Josh - I think we've beat this one to death but hey, that's what it's all about! As I have the time, I think I'll insert a valve and start slow with the restriction. A few more pounds of pressure might work well.
I'll let the group know when and if I do this.
>From: "Josh Colombo"
>Reply-To:
BC-BFLegacyWorks@yahoogroups.com
>To:
>Subject: RE: [BC-BFLegacyWorks] Fuel Return Line Mod??
>Date: Wed, 19 Jun 2002 10:30:42 -0500
>
>Yeah, what you have done does make sense.
>
>You hit on a point I sorta didn't touch on, but sorta took for granted in my little examble.
>
>At some point there is a physical limitation to how much stuff you can fit through a certain sized hole, regardless of pressure. In my example I used one of those little coffee straws because they're rather small and can be "saturated" more easily in comparison to a normal straw.
>
>Pretty much same goes for the injectors. I'll use the word saturation.....there's probably a more correct term....but it works.
>
>Let's look at your Saab injector. It's rated at 210 cc/min at 2.5 bar. When doubling pressure you bumped it's flow rate up too....more then double 450 cc/min at 5 bar.
>
>The above results would indicate to me that the Saab injector's physical flow characteristics are pretty damn good. At stock they may be at 40% saturation....when doublin pressure they may be at 80-85% saturation to how much they can physically flow. At some point......with you increasing pressure......you shouldn't continue to see an increase in flow rate.....consider that 100% saturation of the injector's physical flow characteristics.
>
>Things to keep in mind......does fuel not flow as well as water? I'm not sure?
>What sort of long term affects is the higher pressure going to do to your fuel system. It may not be worth the safety hazard....or the headache of replacing all your fuel lines with higher pressure lines.....really not sure.
>
>As for the subie injectors.....Who's to say what saturation point or level they are currently running at right now. It could be 40%, could be 50%, could be 80%. I really don't know, and without doing some testing, it would be almost impossible to tell.
>
>Hope this helps clarify things.
>
>Josh
>
> -----Original Message-----
> From: Matthew Reese [mailto:
carmat76@hotmail.com]
> Sent: Wed 6/19/2002 9:50 AM
> To:
BC-BFLegacyWorks@yahoogroups.com
> Cc:
> Subject: RE: [BC-BFLegacyWorks] Fuel Return Line Mod??
>
>
>
>
> 1 ml = 1 cc of water ~=1 cc fuel: close enough for us in this discussion! I have to disagree with the flow and time explanation. Ex - My saab injector for my water injection is rated at 210 cc/min. I have a Bosch fuel pump from the Saab and when feeding the injector it put out about 450 ml/min (I have measured the volume because I wanted the volume around 175 ml/min). This injector, like the sube, is rated at a certain pressure. On the Saab the standard regulator is 2.5 bar. The pump is kicking out 5 bar but the extra is routed around the injector and returned. With my installing the pump directly to the injector I doubled it's flow. Are these principles different for the sube? Please point out my misunderstanding.
>
> Thanks for discussing this!
>
>
> >From: "Josh Colombo"
> >Reply-To:
BC-BFLegacyWorks@yahoogroups.com
> >To:
> >Subject: RE: [BC-BFLegacyWorks] Fuel Return Line Mod??
> >Date: Wed, 19 Jun 2002 08:25:11 -0500
> >
> >Adam sorta hit the nail on the head when he mentioned IPW. Those numbers 360 & 390 are in units of cc/min. That is a flow rate......meaning you can flow soo much stuff through this injector in a give amount of time. This is rgardless of the pressure...(assuming your tuning is stock...more on that in a minute)
> >
> >Think of it this way. Let's say I have one of those small coffee straws, I give it to Johny....a 12 year old kid, he blows through the straw....and get's say 5 cc of air per min through the straw with 10 psi (yes I know I shouldn't mix metric & standard units...) (numbers are completely random and arbitrary) Then I give that same straw to the Hanz.....a big body builder type guy. He blows through the straw.....maybe get's like 6 or 6 cc per min through the straw, but at 17 psi.......He's upped the pressure....however the return in flow due to the higher pressure is not really seen.
> >
> >Granted the example is not a very scientific one.....but it helps the point.
> >
> >Now back to IPW.....like Adam said.....if you make this longer, you will have more time for fuel to be squirted into the combustion chamber.....hence more volume of fuel being put in. But you do need some sort of aftermarket controller.
> >
> >Not sure if this post helps....or confuses more....hopefully it helps.
> >
> >Josh
> >
> > -----Original Message-----
> > From: Matthew Reese [mailto:
carmat76@hotmail.com]
> > Sent: Wed 6/19/2002 7:41 AM
> > To:
BC-BFLegacyWorks@yahoogroups.com
> > Cc:
> > Subject: RE: [BC-BFLegacyWorks] Fuel Return Line Mod??
> >
> >
> >
> > My purpose: I am trying to inject more fuel. I was under the impression that a larger pump would push more fuel (maybe or maybe just handle an equivalent volume doing less work) but the regulator will only allow a certain max pressure to see the injectors. I understand how the regulator works.. I've taken different ones apart and the diaphram is controlled by vaccum as you say etc... I am confident from my experimenting with injectors and pumps (working on water injection system) that if the return line was completely blocked the injectors would flow far more than 360 or 390 mls (whatever it is). That flow rate is measured as max using a certain pressure. Anyway I guess the idea I'm considering is not very clear - no problem I'll start tinkering!
> >
> > Thanks!
> >
> >
> >
> >
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