B_ROCKS_IT

Okay so I found a few threads on this, but they were older, wanted to see if anyone feels like they have the best solution; I need to get a second pump (likely WB400) running off hobswitch above 6psi. DO I need to do surge tank or can I make it work intank etc...


Thanks

Here are threads I was looking at:

https://ls1tech.com/forums/cadillac-...uel-pumps.html

https://ls1tech.com/forums/cadillac-...ank-pumps.html

FuzzyLog1c

iTrader: (4)

And now begins the $1000+ adventure...

B_ROCKS_IT

Cmon dont say that... I am about to drop 5+ on clutch and 8.8

DMM

Welcome to the club!

B_ROCKS_IT

- I should have a copy of my tune for you to look over today...

FuzzyLog1c

iTrader: (4)

One thing that might help you cheaply mitigate those fuel pressure transients is larger diameter fuel tubing and better filtration.

Did you see the -8AN parts that I posted up earlier? Summit Racing sells 100 micron pre-pump, 10 micron post-pump, and a 20 foot stainless steel hose kit.

While it won't solve the problem in and of itself, the additional volume carried in the lines will slightly reduce the severity of the initial surge.

Skidmarcx

You may as well do a fuel cell at this point

vmapper

iTrader: (8)

Just wondering how you are obtaining 770+ rwhp and you are now inquiring about fueling?
what do you currently have for a setup?

FuzzyLog1c

iTrader: (4)

Probably because he went to get his car tuned with 114 octane in the tank.

B_ROCKS_IT

Yep fuzzy said it, I'm running a walbro 400 and 70# injectors... Ran 110 on the dyno day - just did another dyno today with 110 on a dynopro and got 725 on 12psi...

So after speaking with many people at the dyno, my builder and 98Cobra from on here, it sounds like the most cost efficient way to run dual pumps will be to bulkhead the second wb400 off the passenger side of tank, run new line up to passenger fuel rail, and run the whole second pump off of hobs switch.

I will need new injectors also though, any one wants my 70's let me know.

FuzzyLog1c

iTrader: (4)

Buy ID850s and be done with it.

vmapper

iTrader: (8)

You bet! and the best part is you get all the data to run these...

vmapper

iTrader: (8)

As for most efficient way, I can not suggest anything.. the route I took was an extreme pita...
Bought two buckets, put one on each side (drivers and passenger) with plenty of pump to cover 1000+, using a X pattern for the pump jets, using 1/2" I.D. 100% Fluoroelastomer tubing.
Ran twin -6 feed lines to the FST performance fuel filter block then -8 to the front rail, then through an adjustable regulator and -6 return back to a Y then -6 return to each return (5/16" - reducer)...
yea, lots of line, lots of tinkering... but I wont have to worry about gunning it on a low tank...

You could probably get away with what you already have in mind...

itsslow98

iTrader: (18)

Fixed

ColeGraham

iTrader: (8)

ID850s $900 new...ID1000s $950 new...

Like itsslow98 "fixed"...get the 1000s...850s start running high on their duty cycle at 700+.

runsfromdacops

just get the FIC1150s so you have room for e85.i have them in my car and i love them and they are cheaper then the ids

as for the fuel pumps
if i still had the stock tank in my car i would have gone to a small surge tank in the trunk.
for pumps id go with 2 bosh o44s or 2 wd400.

vmapper

iTrader: (8)

This is a good point.
I always forget about E85, its not available anywhere near here.

s-cam

I did exactly above- small surge tank, 2 bosch 044s ( surge tank mounted outside of truck behind rear passenger wheel) -8 feed, -6 return, aeromotive regulator etc.

B_ROCKS_IT

Thanks for all the help guys!

rcotillier

I know this thread is old, but vmapper how reliable was the dual fuel pump bucket adn do you have a write up on ow you did it?