Originally Posted by thom000001

i still say, just put 3 pumps in and call it a day......can run anything then

Originally Posted by mrg1981

+1000
Hey! At least someone gets it!

The point is that some have argued that a Walbro 255 CANNOT obtain the power level. I WAS THE ONE that pointed out the other factors that they completely ignored in their factually incorrect assumption.

Binder, you have a great understanding of fuel and biochemistry. Thank you for proving our point, (though you thought you were arguing against it).

Nomyth- I'm not upset. I don't get emotional over something like this, I just wanted to clearly make my point that you were ignoring a lot of factors. For instance, the Pro-EFI will stop the head lift if the fuel pressure drops. In fact, this is exactly what was happening when I had low fuel levels. The fuel pressure was dropping from 48 to 35, but the Pro-EFI kept it from detonating and kept the A/F ratio where it should be. This is a major part of what prevented any head lift. Also, the L19's are incredible and do prevent head lift as well. Your statements were:
"the car wouldn't get two miles down the road until the heads started making their way north of the block."
AND
"you can make that # for like one pass on a dyno but you won't be albe (sic) to drive the car down the street without the engine coming apart or make multiple pass on the dyno or at the strip"

5,000+ miles over the course of 2 years
approximately a dozen (estimated from memory) 1/4 mile passes at high boost
No head lift
No detonation problems

Now...I did switch to the twin fuel pump, and I assure you it was not free! I spent a considerable sum of money on my build (over $65,000) and felt that the twin pump setup is a more reliable build and it allowed my tuner to be more aggressive with the tuning. He just called me while I was typing this to give me an update. You can clearly see massive improvements.

Previous low boost setting~ 14.7 PSI ~525WHP
New low boost setting~9PSI (spring pressure) ~450WHP (estimated, no dyno yet)

I certainly am not arguing that a single pump is sufficient for most high HP builds. I am merely demonstrating that the single pump CAN reach 700WHP, as it did for me and several others; that it can do so without head lift; that it can do so on the street and the track, not just on a dyno; and that running higher octane fuel does not mean that the single pump is now suddenly 2 pumps, rather you overlooked the details of my build before you made the contradictory statements.

It is commonly thrown around in this industry that a Walbro 255 is NOT good for more than 550WHP (insert variable number). As binder explained thoroughly, you cannot make claims like this, since there are other factors that greatly influence the WHP obtained with the same fuel pump. Maybe a more accurate way to make the same type of assertion is akin to: "On XX octane, with XXX injectors, etc, etc...a single Walbro 255 will provide reliable fuel pressure up to about YYY WHP." That's a far cry from "The Walbro can't do that! Snozzberries, You are Full of Ish! I know you are lying!...Oh wait, you put some high octane gas in your tank!?!?! That's cheating! That counts as TWO pumps!You have to use 85 Octane and blow up your engine! How dare you use common sense and go with a safer fuel!" (I keed, I keed...sort of)

BTW, Snozzberries!!!! LOL!!! I don't even know what that means, but it's hilarious!

Originally Posted by thom000001

i still say, just put 3 pumps in and call it a day......can run anything then

Originally Posted by Alberto

mrg - what did you run/trap @ 700whp?

Originally Posted by Alberto

600whp on a Greddy kit local (not me) did 132mph spinning in 1st

Originally Posted by Alberto

Thats a common misconception-at least it hasnt been that way for me in my experiences. I run faster traps when I hook and accelerate as opposed to spinning and trying to accelerate out of that.

Originally Posted by Alberto

mrg - what did you run/trap @ 700whp?