jcfrx7

Will this set up work on my 13BT.

elwood

iTrader: (1)

That's a definite maybe. The routing is OK. You'll need to verify your flow ratings. Read the thread on my in-tank setup, it'll take you through that part.

Siraniko

iTrader: (13)

thats the route that most old school are taking. thats what we have in the turbo duece (sold) and 3-rotor RX-3 SP. that will ensure that you dont starve. In tank is not always the best

PercentSevenC

Should be okay as long as the -SE pump flows enough. It probably does.

jcfrx7

Thanks for the inputs. Correct me if Iam wrong I think that the SE pump flows at 30GPH. + some of the Walboro pump return is going back to the surge tank...so I think that would help keep it full.

trochoid

iTrader: (6)

Should work fine, what size is your sump tank, (needs to be 1 litre+)? Not sure where you found the flow rate for the SE pump, but it's my understanding that it outflows the Walbro, or at least the stock TII pump, but at a slightly lower psi.

Your drawing needs a little work. The line from the man tank to the SE pump should be no longer than stock and the return line from the surge tank to the main tank should be no lower than 1" from the top of the surge tank. If you mount the surge tnk under the body in the horizontal position, the return line can come out of the top of the surge tank. The feed for the Walbro should be at the bottom rearward end of the surge tank.

jcfrx7

^
very nice thanks.

Hyper4mance2k

iTrader: (40)

IIRC SE pump is 60psi @ 135lph

elwood

iTrader: (1)

The flow rate of the 'SE pump at 60psi doesn't matter. You need to know what it is at 0 psi (free flow). It will be a lot higher. The best way to be sure is to run the pump so it flows a known volume and time it. The manufacturer's specs for these things are hard to find and probably not very accurate because of all the variables involved -- especially voltage at your pump. Once you know the free flow rate, you need to calculate your fuel consumption at WOT. If your free flow is greater than or equal to your fuel consumption at WOT, you're OK.

Siraniko

iTrader: (13)

SE pump is more than enough. you can even use a non-FI pump to feed the surge tank since its just a short run

elwood

iTrader: (1)

I agree that a non-FI pump would be a good selection -- something that is designed more for flow than pressure. But I would definitely check the flow rate of that -SE pump based on expected HP. I don't think it would flow enough for my application, for example.

Hell, I'll do the calcs for you -- how much HP do you plan to make, jcfrx7?

Jeff20B

iTrader: (13)

A Carter would make an excellent choice for feeding a surge tank. They do actually fit under a first gen.

jcfrx7

Taking it to the dyno in a couple of weeks and Iam hoping it makes 300HP

jcfrx7

So the goal here is keep the pums lower than the tanks. Cause I was going to mount the serge tank in the hatch. That makes it higher than the main tank and keep the pumps low by the main tank. Or can I put the pups high by the serge tank in the hatch.

jcfrx7

I will take a couple of pictures for a better view.

elwood

iTrader: (1)

You say 300HP -- I'll assume that's rear wheel HP or RWHP. Drivetrain losses will be approx 15%, so your flywheel HP will be 345.

HP X BSFC = Fuel Consumption
(345 HP) (.70 Lb/HP-Hr) = 242 Lb/Hr
Gasoline density = 1.621 Lb/L
Fuel consumption = 149 L/Hr

So your -SE pump must deliver 149 L/Hr at free flow to keep up if you're making 300 RWHP.

If you're making 300 Flywheel HP, the pump will need to supply 130 L/Hr.

Now take that pump and test it. Take it from a guy who's popped a motor. Set up the outlet of the pump so it empties into a 5 gallon bucket. Turn the pump on and time how long it takes the pump to fill up the bucket. This will give you the free flow rating. It doesn't take long, but it will avoid a big potential problem.

elwood

iTrader: (1)

I wouldn't mount anything that holds fuel inside the car. This topic has been kicked around on many forums many times, so I'm not trying to recreate that discussion -- do a search. But I like to have metal between me and gasoline.

jcfrx7

Good point and I will reconsider and find a place outside the car. Safety first. Thanks.

jcfrx7

You are the man when it comes to fuel consumption. Thanks I will see how fast the pump pumps 5 gal.

jcfrx7

Another question... So you are saying that the SE pump needs to pump out 5 gal in 8 min. to make about 35 GHR right?

elwood

iTrader: (1)

Yes, that's about right -- to be exact I came up with 7 min, 38 sec (for 300 RWHP):

149L/hr = 39.3 Gal/hr = 39.3 Gal/60 min = 5 Gal / 7.63 min

Hyper4mance2k

iTrader: (40)

sorry i ment that the stock SE pump can pump a maximum psi of 60 and max flow of 135lph. it was in some old book i have. from what I've heard they're good to just over 250whp after that you're pushing it... the walbro 255's are good to only 300whp. DSport did a really good fuel pump test about a year ago. you might want to try and find their test numbers.

REVHED

That's what I did except I used a Carter as the filler pump and Bosch as the main pump. There's enough room under the car to shoehorn it all in.

The SE pump should be ok as you'd have to be under full load for quite some time to suck the surge tank dry.

elwood

iTrader: (1)

Nice setup. The Carter and Bosch pumps come highly recommended.

REVHED

Thanks. I have it set up a bit differently now with the Carter mounted vertically and away from the brake line.

The Bosch pumps are great. They're OE on Porches so they can't be too bad.