With winter coming Ive decided its time to let go of the stock appearing turbo setup and connect a proper turbo to my motor. Once I get a new master cylinder in my car and hope thats why I suddenly lost my clutch pedal a few days ago after MONTHS of chasing lockout/engagement issues with multiple clutches, I will be selling a lot of parts from my car.

Ultimately, the goal is somewhere in the 850-950 range for a 150-155mph trap car with either a 6466 or a 6766 (probably the 64 since I only rev to 9000 and it should be lots of fun on my 2.4L, especially in the twinscroll configuration Im envisioning)

I already have FIC 2150's, and now I have stock send and return lines with two Walbro 255's on a Buschur double pumper. The car spends 90% of its life on E85 and 93 is put in every 1000 miles just for safetys sake to clean any gunk that may grace the injector tips with its ugly presence.


So, I know I need to upgrade my pumps and I know I need to upgrade my send line.

My questions are...
A. What pumps do I go with to replace my Walbros?
B. Do I leave the stock return line OR do I replace it with a -6 return?
C. What FPR do I go with?

Again, my goal is keep this all very simple. Id like a simple set of pumps that can drop right onto the double pumper setup and clip right in without any wild modifying. As much as Id like to run a fuel cell, I dont see it happening as of now.

 

Jason (angryevo8) trapped 161 on a pair of Aeromotive 320's. Should be all you need to feed that hungry 6466/2.4 combo. As for an FPR, any of the replacement FPR setups you can buy will suffice. Such as the one from STM or MAP.

 

Akash ran dual 255s, big lines, x4 2150s and was out at 905whp. Now it has dual 450s and went from a 12.2 to a 10.1 with no other changes.

 

I'm guessing that was at lower bfp? Or 43.5? ^^^

 

Aaron, was that an -8AN feed and -6AN return?

 

This was also with hardwiring the primary pump. I ran -8 feed and the stock return with a fuel lab mini Also made 850 on Boostins mustang dyno. Not that I really like the idea of relying on a second pump to kick on but it will get the job done.

 

hmmm yes I was looking into the 450s. keeping two 255s sounds interesting but I dont want you to have to tune my injectors to like 90+ IDC Aaron :P

I was thinking this perhaps too...leave one 255 as the primary and get one 450 and use that pump as the secondary wired to my hobbs switch. Thats a little more fuel than two 340s and Ill only have to change one pump.

so I taake it is ok then to run a stock return then too? I was interested in the mini regulator for sure.

 

my guess is it would be best to run the 450 as a primary and the 255 as a second pump. either way i think you may need a FPR but at least the fuel pressure spike will be much less with the 255 as your second pump.

 

You wouldn't want the 450 to feed the 255 because the 450 is going to outflow the 255 and the 255 will basically just become a bottleneck at that point.


The 255 feeding the 450 on the other hand should work fine.

 

My fuel system is two 450s both hardwired in and both running the whole time with -8 feed and -6 return.

Why not just run both pumps the whole time? I've not had any problem with overwhelming the regulator. Just get a good one. To me, the idea of having the second pump on a hobbs switch is chancy. What if the switch fails? It will ruin your engine...

 

^^^this

 

Running them simultaneously is a better bet but its an extra load at idle.

 

How much WHP stock lines are good for with twin walbro 255?

 

The pumps run in parallel, not in series. Which pump activates first has no impact on maximum flow or volume. Having the 450 on full time lessens the fuel pressure spike when the secondary pump kicks on. For example, when my secondary 255 kicks on, my fuel pressure IMMEDIATELY spikes to 70-75psi. The factory regulator gets a bit overwhelmed at first, but then starts doin it's job.

 

Hardwired 255's, AN 8 feed, AN 6 rail and return, Fuel Lab AN 6 inline mounted at the firewall. I'm not playing anywhere near 900whp but if I were the only thing I'd have to change is putting in bigger pumps.

The fuel system upgrades cheaper than just about anything else in the car. If you're running hard wired pumps they'll be going full blast all the time. You might be able to get away with a stock FPR or return but why put the stress on the pumps? 10 feet of AN line and a good FPR is worth the controllability and longevity you'll gain from it.

The rail is the big one though. I have a friend with a 2.4 FP black and he was running stock everything except injectors and a twin 255 setup and you could see the AFR gradient across his plugs like they'd come out of different motors and different mileages.