Ihasfip

iTrader: (5)

I was thinking about a single Walbro. Is that plenty for spraying about 150 shot and running a comp cams 306? I had been spraying an 80 shot through it and it was working fine, my A/F was right on the 11.5 . Well now on the 150shot it was 13.5 with a 62/N and 33/F jets. So I upped the fuel side to a 41 and it dropped to 13.0 at WOT. Leads me to believe the pump is too weak. I haven't stuck a fuel pressure gauge on it while at WOT, but at the point I don't think there is much point in it. What do you think? Single Walbro or more? And where is a good walkthru on exactly where to cut up my floor to get to the pump? I saw a real good one somewhere that even had measurements to exactly where to cut. Thanks guys.

D

moehorsepower

iTrader: (3)

Go with the Walbro GS 340, it pumps out a little more than the 255

ss.slp.ls1

iTrader: (36)

A Racetronix kit with a Walbro 255lph pump is more than sufficient for a 150 shot.

I did the trap door method, it's easy. Here is the write-up I used:

http://www.geocities.com/formulapower2/fuelpump.html

Ihasfip

iTrader: (5)

Is that still a drop in style replacement pump? And which one of our sponsors carries it?

D

Ihasfip

iTrader: (5)

Yea that is the one I was looking for. Thanks man. Who is the best sponsor to purchase a Walbro and hotwire kit from?

D

Ihasfip

iTrader: (5)

Now its not working? WTF! Anyways, I am sure it will come back up.

ss.slp.ls1

iTrader: (36)

This is what I bought:

http://www.racetronix.biz/itemdesc.a...PA-003&eq=&Tp=

You pull out your fuel pump assembly, remove the old pump, install the new one, and drop the assembly back in. The write-up shows everything. Its easy. There is really no need for the hotwire kit.

koolaid_kid

iTrader: (21)

I would suggest Lonnie's Performance. He carries the Racetronix kit for the same price, and he will answer the phone if you have questions. Racetronix doesn't even list a phone number.
Opinions vary on the hotwire kit. I have one, and the difference in quality, construction and power supplied to the pump is not even in the same state, much less the same ballpark. Remember, you are putting in a pump that is more powerful (hence the increase in volume). The stock wiring is marginal, at best, for the stock pump.
Quote from their site:
"Simple voltage and current tests show the heavy loss in factory wiring and the dramatic increase in pump performance with the Racetronix Plug & Play harness! Voltage differential increases to over 2 volts with increase in line pressure / pump current draw @ W.O.T. This equates to as much as a 30% increase in pump volume based on Walbro specs and Racetronix flow tests!"
Take part of it as advertising hype. Much of it is not, however. Call Lonnie and let him give you the skinny.

Stroked96Bowtie

iTrader: (22)

Single walbro should handle those power levels fine. Im not a big fan of the A/F gauges...just read the plug...it never lies. I ran a 165 shot on a 383ci through a duel nozzle kit just fine on a 255. Do some searching around, you might be surpised about what looking at a plug can tell you.

Ihasfip

iTrader: (5)

Hm, ok. I will look into it. What about problems on running the tank below a 1/4. I have heard with some of the aftermarket pumps it isn't a good idea. Whats the concensus on that?

D

Ihasfip

iTrader: (5)

I already pulled the plugs and changed them. I didn't cut them but they were lean as hell.

D

Stroked96Bowtie

iTrader: (22)

You just dont want the pump to get hot, thats the big thing. The gas running through it is actually what keeps it cool. Once your tank gets low more and more of the pump is sitting out of gas. I try to use the 1/8th of a tank approach, and Im the worlds worste I think about letting a car run down all the way to E.

Once that pump gets too hot or has several hot cycles pressure will start to drop.

RamAir95TA

iTrader: (2)

Here is a picture of when I did mine with supplemental measurements:

http://www.worldisround.com/articles/12533/photo14.html

Ihasfip

iTrader: (5)

Thats what i assumed. Same as the factory pump.

D

Lonnies Performance

iTrader: (16)

I stock the Racetronix kits if you are interested & also make custom dual pump kits if you are above 550rwhp.

The Racetronix kits retain the factory configuration to keep the pumps submerged with fuel.

Feel free to give me a call if I can help.

Ihasfip

iTrader: (5)

Ok well I will give you a call. It will be about two weeks. I don't think I am above 550... But maybe eventually I will be. I don't honestly have any idea. But thanks, and I will call you soon.

D