I am running out of fuel at full boost with my A1000 pump, would dual 255 high press. pumps solve my problem?
I am using a sumped fuel cell, so I would use the inline pumps.
My car went 10.67 @129 (not wot on the complete run) and weighs 3620# with me in it. Guessing about 600-625 rwhp.
What do you guys think?
Steve

 

Twin 255's should outflow the Aeromotive. I've replaced a few Aeromotive pumps with twins for the same reason you are mentioning.

 

How much rwhp would these support? I want to overdue so I can grow.
Steve

 

I don't believe twin inline walbros would help your situation. You would get more fuel if you installed another fitting on your sump and ran the two walbro externals in parallel utilizing a y fitting into -8 or -10 fuel line. A fuel system setup like this utilizing -8 fuel line is good for ~800rwhp. A fuel system setup like this utilizing a -10 feed line and -8 return line is good for over 1000rwhp.

 

I agree with 96VortechSS. The A1000 will do more than a pair of 255's in series. However, a pair of 255's in parrallel will support more than the A1000.

Mike

 

I 3rd the last 2. You definitly don't want to run them inline (or series). Parallel is what you need. If you don't run them in parallel then i believe it will only flow as much as 1 of the 2 pumps. Which ever is the highest flowing of the 2. I'm running the racetronix dual 255's i got from Lonnie and it's supporting 800rwhp now. 175hp of that being a dry nitrous shot which is upping the fuel pressure and the pumps are still keeping up. Still on factory fuel lines also but i'm probably going to go with larger lines and run my fuel rails parallel also.

Ken R.

 

Parallel is what I meant, I just stated "inline" so guys would know I did not have intank pumps.
That being said, This would supply enough for 1000 hp with my -10 supply, -8 return? These pumps just seem too good to be true at thier price, inlet/outlet sizes as well as thier overall size.
Thanks for the replies, Steve

 

The 1000 will supply enough fuel for your set-up no problem. You have another problem you should be looking for. I would guess your voltage is dropping a Boost-a-pump or pump controller will fix that.

 

The A1000 will not support 1000 boosted hp. They run out of steam at around 750 flywheel. Twin external 255's are also reaching their limits at 1000hp.

 

You are right it won't support 1000hp but he said he is making low 600s and it won't have a problem supporting that. If you want to make 1000HP and you stay with aeromotive you will have to step up to the bigger pumps.

 

The next step up from the A1000 is the Aeromotive Eliminator. I don't know exactly how much better it is though. It's supposed to be good to 1100 HP.

 

I've made over 900 fwhp with an A1000, but it was on a carb'd setup running a maximum of 24 psi fuel pressure. The capability will be lower with injection because the fuel pressure is higher.

Mike

 

I should be over 700fwhp (625+ at wheels) going through an auto (no lockup) and 9" rear end. My wiring consists of 75a relay with 8ga wire and datalog shows over 13.5v on complete run. My base pressure is 50psi and I'm seeing 19+ psi boost (69 psi). My afr's were well into the 12's to start and the fuel pressure only rose about 15psi and would flatten out, as we added fuel in the ve table the pressure started dropping under boost.
I'm convinced the pump is past it's limit.
I am also looking at the Magnafuel Pro Tuner 625 and twin Bosch 044's. I could turn on the second Bosch above a set amount of boost so I don't overheat the fuel under cruise conditions, but I don't know if the Bosch's have an internal check valve (or walbro's for that matter) or not.
Also, I don't want to use a boost-a-pump as I think it is a band aid solution-plus, I would like to have a big margin for error (more power someday).
Thanks,Steve

 

What size injectors are you using? I personnaly found the limit with the a1000to be higher with th400 loose converter 9 inch etc. I yanked mine in the mid six hundred range because of similar problems. I installed the eliminator pump and had the same issue it turned out to be voltage drop at the pump I fixed that with a boost-a-pump. I only use it to keep a constant voltage at the pump I don't use the voltage ramp up features. Eliminator Supports over 800RWHP on my car and I have seen it support over 900RWHP on another car. I should have my new set-up on the dyno next week I'll let you know if it supports what should be over 900RWHP on my car.

 

I am using 8-55lb injectors as primaries, and 4-72's as secondaries staged.
It is possible I have low voltage problems, but Aeromotive says these pumps are good for about the same power I'm at now. Also, when I look at the pumps flow at 70psi it goes way down.
My reason for looking at the Walbro/Bosch pumps is thier continous duty rating.
Let me know how your dyno session goes.
Thanks, Steve