JoeNova

He's not running out of pump. He's being restricted by the stock rails. To increase the flow through a certain diameter tube, you increase the pressure.

Voltage boosters for pumps are cheap. For $150 you could turn those 450s into 550s and not have to plumb another pump.

You can tap the ends of the truck rails, the aluminum there is 1/4" thick. Then you could have more than one feed for those massive rails, and it would solve your restriction problem.

This is sloppy mechanics, afterall.

M_Minnick

iTrader: (1)

That is definitely possible, as it now appears that after further inspection, all of the rods on that bank are bent. That side of the motor may just be a little leaner than the other.

gsxrred1000

iTrader: (3)

I'd say fuel line and rails need to be up sized. I'm sure those pumps can handle 1k hp but fuel rail is probly at its limit. Has to be a restriction because there is no way he is outta injector or pump being one of those pumps supports 7-800hp. What does that leave.......

pantera_efi

iTrader: (1)

Hi, I would use my heads studs @ 80.lb/ft.
I would fit a FelPro 1041 gasket.

Would you like my help ?

I have a great deal on Forged Rods with ARP @ $500.00 to your door.
I would fit my Forged Pistons with Steel Rings.

The chance to MATCH weight is possible with a lite piston/pin.

Lance

SLOW SEDAN

iTrader: (13)

I wouldn't run 1041's especially when they cost more then 12622033.

Molnar rods? Last set I got was about $500 shipped and they seem to hold up well. Just don't opt for the lightweight rods they aren't as strong and a few grams makes no difference when trying to make 1000+hp.

aggie91

I fully understand that increasing the pressure would increase flow.

BUT, if he is still using the stock truck regulator that is not referenced to boost, how does increasing the voltage to the pump increase the flow when the pressure the regulator is set at does not change?

JoeNova

Funny you mention that considering your vote was to just add a 3rd pump. Doesn't solve the regulator issue. I was offering the voltage boosters as an alternative to the third pump, not to increase pressure.

I still vote for tapping the truck rails and running a pump to each side, or swapping regulators.

gsxrred1000

iTrader: (3)

Matt never uses boost referenced regulators..

69-chvl

iTrader: (11)

I think he should make sure his alternator is putting out full voltage at high rpms before touching any fuel system component.

I had an issue with a couple of alternators cutting out above 5500+ rpms and fuel pressure starting dropping quick...

denmah

iTrader: (2)

ill check voltage on my logs, but i had planned on butchering some rails

brandon6.0

iTrader: (32)

couldn't u just install some cheap ebay fuel rails and regulator and be done with it? thin we can see where that s480 maxxs out at! I mean you have pushed that stock rail setup pretty far. I would say u have proved your point. We all know they are capable of 990whp now lol!

Forcefed86

iTrader: (4)

I'm at 43psi at the rail on stock LS1 rails (same diameter feed as the truck, smaller diameter rails, and no return). The rail feed isn't the issue. I've run over 20lbs through a 370" motor... same heads, similar cam, same turbo on 85% ethanol with no fuel supply issues. 1 4303 pump with a voltage booster on 1/2 fuel line with good voltage. 160lb injectors.

Get a regulator. Easy to run the return off the regulator as well. This $150 mallory unit works great and is the cheapest I've found with 1/2" ports. Used on several cars now.

https://www.summitracing.com/parts/msd-29389

aggie91

Yeah, that was a statement my son made, I was not even thinking about the pressure thing at the time. I realize the regulator/rails would still be the restriction.

Thinking it thru a bit more, your idea of tapping the end of the rails for fittings and having a less restrictive set up would be a better solution.

It will be interesting to see what Matt chooses to do with his set up. I think we all learn from watching him and his methods.

forcd ind

iTrader: (7)

What was the engine build he had in it for the latest dyno session-was it stock rods/pistons-I dropped something on my eye so wearing a patch, makes it hard to go back thru and read it all again, lol

Black89Z51

iTrader: (2)

SBE Gen IV

denmah

iTrader: (2)

TrendSetter

did a search and only found stuff for 350-400. care to share a better source?

TDagen

Already back in the truck haha!!! Go Matt!

TDagen

The kenne bell boost-a-pump is $266. Thats what I would use for a pump booster. Never used the boost a pump but a friend of mine has, I used their boost a spark for some spark plug blow out issues I had years ago above 24psi and it worked as advertised.

JoeNova

Casper electronics voltage boosters are only $78. They add 2.2V, which is a lot for a Walbro 450 since they are fairly sensitive to voltage/pressure.