Fuel Issues Blues..

[ElecTech]

Those pumps will deliver 100 psi capacity, but the 400lph is @ 40psi so if you start at a 50 psi base pressure, with 20 psi boost you have an effective pressure of 70 psi. More pressure to compensate for those injectors will only make the situation worse as pump flow drops as the pressure goes up.

calculated estimations put you needing about a 105 lb per hour based on the last dyno graph I saw for your truck. I think things have changed since then so i would say it's time to step up.

[RoadconeTuning]

Fix is good for clean and flowing but don't fall into their injector trap. The id units are a LOT better. Id1000 and id2000 are nice.

[Foose04]

Got the filter installed and FP sensor to log pressure. With a 55 base, FP never dropped below 70psi with 14-15 boost and airfuel still went near 13 with 110 duty. Pretty sure my Deka's are dirty/done deal.

Also I think the Id1000s/100lb are to small for an upgrade, so I called and talked to a few guys running the bosch 127s and all seem to like them. Also talked to John at FIC and feel pretty good about it, if I'm not happy, send them back for a refund. So well see, love to see what number this snail makes around 20psi. John split overnight shipping with me, so i got 48 hours to tune prior to dyno time lol.

[RoadconeTuning]

you can crank the pressure on the ID1000's up to something pretty stupid and get up to 127lbs IIRC

[LXtasy]

Should have told them you were foose04. The fastest turbo 4.8 truck in the world. They may have heard of you because you are kind of a big deal

[Foose04]

Yeah but why not buy the correct size to begin with when spending so much damn money for these bastards and have the fuel pumps work efficiently.

On another note John also wasn't big on the 100 micron filter only, so best I could find safe for ethenal is manga fuel filter with a 25-micron. Going to install it inline, post 100 filter. Hope to have it all running tomorrow after work with the boost a pump removed, less things involved maybe the better.

[RoadconeTuning]

nine hunned hoe powuh?

[Foose04]

Originally Posted by LXtasy

Should have told them you were foose04. The fastest turbo 4.8 truck in the world. They may have heard of you because you are kind of a big deal

Might have helped?! I usually save that crap. Normal question when buying parts is

Them: is it for a ls1, 2, 7 or what?
Me: Umm, well it's a 4.8
Them: ( their thoughts, this f'in guy, third one this week with a dream)
Me: Just send me the damn injectors that cost 3 times what my mota's worth.

Ahh well.

[Carlrx7]

ID1000's are 114.280 @ 4 bar according to the injector data. they can run up to 7 bar aka 101.5psi

[Foose04]

That's great but my walbro's don't do anything at 7 bar.

This graph was plotted using the 127 injectors with different pumps. Looks like if I want to run 20-25psi, a base pressure of 50-55 is where my injectors max flow meet my 450's max flow.

[Carlrx7]

Originally Posted by Foose04

That's great but my walbro's don't do anything at 7 bar.

This graph was plotted using the 127 injectors with different pumps. Looks like if I want to run 20-25psi, a base pressure of 50-55 is where my injectors max flow meet my 450's max flow.

Damn good graph, i need to find one for my setup.

[djfury05]

Originally Posted by Carlrx7

Damn good graph, i need to find one for my setup.

All you have to do is go to this link:

http://ls1tech.com/forums/fueling-in...pump-flow.html

1st post at the bottom there is a ZIP file that contains the Excel spreadsheet used to make that graph. You can plug in any information you want and it'll spit out the graph like above.

[spdracr0]

Throw that boost a pump in the damn trash, I can share a horror story with you on that thing

[Foose04]

My 293 should have fuel now, 8x1320cc. Hell of a tip on those bad boys, bet she'll like that.

[Carlrx7]

why did you go with the extended tip ls3 - ls7 injetors instead of the regular 1200s?

[Foose04]

Jon said it's good stuff for cathedral port heads, better distribution/atomizing or some jazz.



Extended tip

[Carlrx7]

I'd double check that with the TBSS manifold, or maybe your old one laying around just to be sure. Something about FAST manifolds they work good on. That looks like a Square L92 manifold. I may be wrong...

[WILLIAMJRDN]

Nice can't wait to see what it does. Carl that is a cathedral port, way too narrow to be l92.

[RoadconeTuning]

hmm, i didnt even know they had injectors like that. makes sense tho.

[1998ta__1991rs]

Originally Posted by Carlrx7

I'd double check that with the TBSS manifold, or maybe your old one laying around just to be sure. Something about FAST manifolds they work good on. That looks like a Square L92 manifold. I may be wrong...

thats a cathedral port Fast in the pictures