powerstrokenstang
11-27-2007, 02:14 PM
ok a buddy of mine has a 7.3 w/ a hypermax turbo kit, well we buried the screw in the pump and turned the one in the fuel line all the way and backed it out 3/4. but the truck falls on its face at 2700 but pulls hard till then. it gets 11 or 12 psi of boost now that we put a holley blue lift pump on last night but it still cuts out and boost just falls when it does it. any ideas?? thanks
mattymx
11-27-2007, 03:23 PM
Sounds like it is either running out of fuel or there is a boost leak somewhere.
Cat_Rebel
11-27-2007, 04:24 PM
The timing wouldn't be off would it? Remeber that 10-12 is tops-safe zone for the old IDIs. 15lbs will blow the head gasket off. I'd check for boost leaks too & then play with the pump again as well.
powerstrokenstang
11-27-2007, 04:43 PM
well it would turn 3200 before we threw the fuel to it and i do not see how it could run out that holley blue flows 110gph
UNCOOL
11-27-2007, 06:00 PM
Undo what you did and start over taking smaller step this time. My uncles 6.9 would make 18 psi on the same charger from Hypermax.
powerstrokenstang
11-27-2007, 08:35 PM
really wow this one only made 7 before turnin the screws , and it has no uppipe leaks
Cat_Rebel
11-27-2007, 10:18 PM
really wow this one only made 7 before turnin the screws , and it has no uppipe leaks
Have you ever though that maybe you have the pump turned up too much? I know mine will really dump in fuel at the top end of the upper gears. I'd back it off a turn & see what happens.
powerstrokenstang
11-27-2007, 10:20 PM
i have yes but never could see how you could go to far on a stock pump but maybe
Cat_Rebel
11-27-2007, 11:52 PM
I know on a N/A engine half a turn is about max, most only do a quarter turn. I can go more but I know I won't pickup much more power & I'll be wasting more fuel.
powerstrokenstang
11-28-2007, 12:37 AM
well he went between 1 and 1 and a half on the screw in the side
85hauler
11-28-2007, 07:21 PM
Maxing the fuel screw (the one inside) will not cuase your RPM loss. However the one "in the fuel line" I presume this is the one in the nose cone. Adjusting that one changes transfer pump pressure. If you adjust transfer pressure incorrectly you could potentially starve the high pressure pump at higher RPMs causing the rpm loss you see. I have never found a reason to adjust transfer pressure on a otherwise stock pump. I would put that screw back to where it was originally and see if your rpms come back up.