jimmyg

Trying to fig out what fuel pump to use for my whippled ly6. I was thinking a walbro 450, but @ 60 psi it only flows 323lph @ 12v or 381@13.5v. Will this be enough for 600rwhp? Using fast 65lb injectors.

JoeNova

Highest I've seen is ~850whp.

NitroFumesAteMyBrain

Theyll make 600 on e85 850 on gas

jimmyg

Nice! Thanks for the reply.

dburt86

iTrader: (2)

depends on what dyno your talking about but mine was tapped at about 720 on a mustang dyno, which is right around 800ish on a DJ

denmah

iTrader: (2)

yep i agree, i made 644whp on E85 with 80s and im out of pump cant get any richer than 12.2 afr area, and on pump fuel i made 740whp also running out of pump.

4l80e unlocked

denmah

iTrader: (2)

i am currently going to install a second 450 and see what happens, if i can run them both at idle with stock truck intake regulator or if i have to stage them and then how far can i go?

Rawr256

Not sure about just one but I'm running two with my Squash setup and 80# injectors. Did 720 on pump gas and 14#'s with my AFR pegging my wideband at 9:1 and was at 72% idc. Couldn't tell you for sure how rich it got but when I leaned it out a couple weeks later and did 743 at same boost and mid 10's afr I was at 65%. This is with a hobbs switch setup.

jimmyg

I have a racetronix 340 set up with the the g7 sender for turbo buick. I would really like to make this into a dual pump set up . How hard is this? Really don't want to shell out another 379$ for the 450 set up and need to go bigger down the road.

denmah

iTrader: (2)

take it out, and throw in two 450s however you have to
Attachment 721500

git R done

jimmyg

jimmyg

I was thinking something like this . I'm just unsure about wiring maybe 2 hot wire kits 1 on a Hobbs @4-5 psi? Just drill a hole in the top of sender and sneak the other pumps wires thru ?

jimmyg

Lol that harbor freight 3 way is pretty slick.

bigmandengo

iTrader: (21)

You could also sell what you have and buy a bolt in racetronix double pump sender and harness.

I installed dual 450s in my g-body tank. Check out my build thread for some ideas.

jimmyg

I check out your set up . Love your car. The racetronix 340x2 set up is 799$ I was hoping to make mine a dual set up a little cheaper than that lol. 800$ is a lot to pay for a pump, coupler, and some wiring .you can buy the twin 340 with the coupler and bracket for 249$ I'm hopeing I can retro this onto my sender

bigmandengo

iTrader: (21)

I've bought the dual pump mount and coupler before from racetronix to adapt two pumps to their single pump sender. I'm not sure if they still sell those parts seperately.

Are you planning on running e85? Why not just buy the walbro 450 pump and it'll easily max out your injectors and give you enough fuel for 550-600 rwhp on e85. Of course, like said in other posts, It'll support 800+ on gas, if you're not on e85. Then, you have a more reliable pump than the 255/340 and don't have to dick around with wiring. You're existing hotwire setup will work fine.

jimmyg

Your probably right, twin 340 s is a little over kill for my set up. I live in mass so no e85, just 93 e10. The 450 should be fine.

Racetronix

iTrader: (2)

The standard RFPK-001 with a KB BAP is enough to support 600RWHP FI and at the same time will maintain the module's functionality.

We recommend a FM FPR with FI apps running 550RWHP+ to stabilize fuel pressure and extend HP support with smaller injectors.

jimmyg

My car is a g body . The pump I have now is g7RXP340MAN I would like to upgrade to a walbro 450 using your pump mount, pump, and grommet. I was told I would be better off selling my set up and buying the g7 450 set up. I'm wondering why this can't be done. I would rather buy a big enough pump instead of going the bap route. My plans are -8 split to -6 feeding both rails. -6 coming out of rails to reg, -6 return

Racetronix

iTrader: (2)

It can be done but the cost in parts and the labor involved does not justify the effort especially considering the resale value of what you have.

The mount and electrical connection on your hanger are not compatible with the Walbro 450. So you have a choice... you can try to break the welds holding the pump mount, install a new DCSS pump mount, DCSS grommet, 450 pump, filter sock, feed tube, clamps and electrical connector. This will void the three year warranty on your hanger assembly.

or...

You can sell the hanger you have and purchase the FPS-G7W450EAN.

You can view the configuration of each hanger in our web store.

The G7 hangers are only available and supported through authorized Racetronix / Buick dealers. There are only a handful available for sale at this time.

We are making changes to the Buick product line so availability will be scarce to non-existent for a while.