Engine/Transmission (1998.5 - 2002) max flow kit Install

[911RAM]

Well I just put on the wildcat max flow kit, there Is no change In my fuel pressure Is that how Its supposed to be? I also have a leak somewhere but that will have to wait till later cause Its 1:55 am and Im tired

 

[Hohn]

NO change at all? Something's DEFINITELY not right... .



jlh

 

[mcoleman]

The leak must be eating up the added pressure.

 

[PC12Driver]

You may not see much difference 'till you put it under a load. I think I gained less than 1 psi at idle, but I gained more than 5 psi under full load. I still can't pull it under 9-10 psi or so with the Mach 2's and the Comp.



Good luck with the leak. At least it's in a nice convenient place on the truck to work on...

 

[911RAM]

Im going to check for leaks tonigt, I think It must be the same spot that Hohn had his because I did not have any sealent on the fitting



If It wasn't for Hohn on his directions I would not have been able to do this, so thank you verry much. The ones that came with the kit left out allot

 

[JStephens]

At an idle I had the same pressure as before but where I can pull fuel pressure down to 5psi with stock lines it only goes down to 10psi with the maxflow at wot. Check the needle valve for leaks if you have a fp gauge I have been through 2 of these and both leaked.

 

[DTangstrom]

Has anybody tried the fuel line kit from Jannetty Racing, how does it compare with Wildcat.

 

[Hohn]

I personally went from 14 to 17 at idle with the max flow. WOT went from 3 to 11.



I think it's the perfect upgrade for the 350hp range, because you can keep all the rest of your fuel delivery stock.



Justin

 

[911RAM]

Yes that Is a conveninent place to work, well I think I fixed the leak and now my pressure Is at 15, the day before I put It on It was at 14. 2 , at wot (which I don't know what that stands for) could only drop It to 10-11, What a difference this kit makes the throttle response Is a little better and mine seems to run a little more quite. Maybe thats just In my head but I think It does

 

[PC12Driver]

Wide Open Throttle



Which is a variation of WFO, or Wide, um "Fully" Open. Yeah, that's it...



I'm at about 450hp and this kit can still keep up with the stock lift pump and no pushers (9 psi @ WOT). A little more psi may help the top end a bit, but at least I'm not in the danger range (<6psi).

 

[Ron Bissett]

P.S.I

A pump that puts out a max 15 psi will not add psi with larger diameter pipes ,more flow less psi, flow will not cause psi restriction will cause pressure . More flow could work better but the pressure will go down not up ,stronger pump More flow same restriction more P. S. I. Ron Bissett in Metro Louisville KY.

 

[PC12Driver]

That is correct; none of these kits will develop more pressure at the lift pump outlet. The gain is seen at the other end of the hose (the VP inlet), which is where most of us have our pressure senders.



These kits reduce friction loss, which is directly proportional to the velocity of the fluid through the lines. The velocity is determined by the flow (GPH) and the diameter of the hose. By increasing the diameter of the lines and fittings, the velocity of the fuel in the lines is decreased, thus friction loss is reduced. This reduction in friction loss shows up as an increase in pressure down the line.



So the numbers we're posting aren't really caused by an increase in pressure from the pump, but by less loss in the line.



At idle, I see 16psi @ the inlet for the VP. There's very little flow, thus very little pressure loss. My lift pump would be putting out slightly over 16psi. Under full load the fuel flow increases substantially, but with the larger diameter fittings and lines the velocity of the fuel isn't anywhere near as high as it would be with the factory system (especially at the banjos), therefore the friction loss is much less. Instead of the 11+psi of friction loss I had with the stock system I now only have 6-7psi.



With the kits installed, there is probably less pressure at the lift pump outlet at high flows, since the decreased friction loss will cause the psi in the lines to be more uniform. But what concerns us is the pressure at the inlet of the VP44. So don't think of it as a kit that increases pressure, but one that reduces loss.