XLR8

iTrader: (52)

I am going to put a 45dcoe on my 85 GSL-SE for a somewhat temporary setup. I am going to go with a blow-through carb setup eventually. With the blow through setup my SE fuel pump will work great. But in NA form it is definatly too much for the Weber.

If I used the WEBER Adjustable FPR from 1.5 to 80 psi that has a return line would it work if adjusted to like 3psi? I know alot of excess fuel will be pumped through the return but Will it work?

I don't want to change the pump if it will just be changed back later. I have heard it will work, and I know its not the best setup. But I just need to know the the FPR can do it...........It is a Weber product and it does state from 1.5 to 80psi......soooooo it should work.

And I could reuse it with my blowthrough setup sinces it has a rising rate option.

This is the Weber FPR http://www.redlineweber.com/html/fue...regulators.htm


Opions please

XLR8

iTrader: (52)

Anyone?

knight1976

Try it. I am using a mallory unit in my gslse and usingthe stock lines and return. It works fine and i can actually pull the fuel down to 2 psi but i run it at 3psi. Hope ya enjoy it

Rotofire

I am using a holley Red fuel pump and FPR it is set somwhere around 3.5 Psi, although i've read somwhere that a Weber45dcoe (such as ours) like to run at 4psi. I am not running a return line, alot of people don't mess with it. This on my 85 GSL, I don't know if it would be different on an SE, i'm not that lucky to own one.

Knight: I like the rims

knight1976

THx Rotofire. I have been getting a ton of compliments on em.

XLR8

iTrader: (52)

Ya, I have heard it will work OK as long as the FPR is of good quality. I just wanted to check and see if anyone here is running the setup so I could get personal experience info.

Weber recommends DCOE carbs to run a 1.5 to 3 psi range. I don't beleive 4psi would hurt for that is what I will be running. I found a post stating some jet sizes at 4psi for a 6 port 13b so that is what I will go with initially.

If anyone has jetting recommendations for my application, please feel free to share

Thanks guys

hornbm

a weber 45dcoe is too small for a 13B. You want a weber 48 dcoe.

knight1976

Not tru. It is fine. Matter of fact a lot of 13b guys are running the 45 DCOE on blowthrough setups. I thought you knew?

Rotor13B

The key word here is "blowthrough". On a N/A setup the 45 is to small.

knight1976

So i guess we are both right.

XLR8

iTrader: (52)

For a stock port 13b a 45 DCOE is fine. Mazdatrix's Weber kit for a SE uses a 45. A 45 can handle up to 200hp unmodified. Its all about what chokes and jetting you use.

680RWHP12A

the 48 weber carb works better for n/a applications as well as blow through turbo, the 48 cost is higher though...

XLR8

iTrader: (52)

double post

rx7gen2

Many people run a 45 DCOE on a NA 13b....the key is having the right choke size. Too big and you lose the bttom end, too small and you lose the top end. A 34mm to 36mm seems common.

XLR8: As far as your fuel system, a return style regulator is better since the pump dont have to work as hard since it only has to push volume which means it wont heat up as much and should last longer. I didnt have much success with the Holley pumps (Red nor Blue). I use the Mallory 4307M regulator from Summit Racing, but finding the right connectors to plumb it in was a brute. Check out this article on fuel system design: http://www.centuryperformance.com/fuel.asp

On dyno runs I have gotten best results between 3.5 lbs and 4 lbs on my weber. Setup (at 5000 feet): F11 emulsion tube, 190 Main, 175 air, 60F9 idle. Your settings will be different so this is where having a dyno and an Air/Fuel gague takes the guess work out of tuning a weber. Check out http://www.dynorad.com/

No matter what jet combo I use, my peak HP is between 6300 - 7000 RPM which tells me my choke is too big. I am trying to decide whether to come down one size or two since the chokes are too friggin expensive to buy both. Any suggestions?

KehoeAutomotive

I used the FI pump on a carb car not that long ago. I installed a good FPR on it and the car worked like a champ.

It was a V-6 to V-8 conversion on a Trans Am but I'm sure the your situation would respond the same.

However!! But!! What size is your return line and can it flow that much fuel?

rx7gen2

I have a 2nd Gen and the return line is the same size as the supply line so I am ok since you cant return fuel faster than the pump can supply it