NHRATA01

iTrader: (10)

Sizing up finally building a large cube all motor street setup this winter, ERL 454 ideally making somewhere between 550-600rwhp. Car is a H/C 346 that made about 430 N/A (a little less probably after the nitrous tune) and ~540 with a 100 shot plate kit. Pressure and a/f was always good running the Racetronix kit. I realize they call the ceiling of that kit about 550 rwhp. Finding non max-effort 454s doing 570, 580ish or so.

Can the 255 support that? Or do I have to go up to a 340 and convert to a return line setup?

HCI2000SS

iTrader: (2)

The 255 pump and hotwire kit can support 600-650 rwhp

tech@WS6store

iTrader: (2)

From personal experience the 255 will not handle 600. Possibly close to it but it also depends on how the fuel system is built and what AFR you are targeting.
The 340 works well and so does the 255 twin pump setup from racetronox.

We have both on our site along with rail kits etc or we can get you all the parts to custom build your own.

Let us know if we can help! That 454 will be plenty thirsty!

NHRATA01

iTrader: (10)

Thanks, I'll keep you in mind and check out your website as I'd be willing to spring for a full kit rather than cobble something together on my own.

If it's a gamble with the single 255 working with the big motor, I'd rather just upgrade the fuel system while I'm doing the motor, instead of firing it up only to find out I'm short on fuel. Or worse go dangerously lean at WOT on a brand new, nice and expensive motor!

HCI2000SS

iTrader: (2)

Just to let you know I'm near 600 rwhp and have no issues whatsoever with the 255 and hotwire kit

tech@WS6store

iTrader: (2)

^ i dont doubt your experience but ive had 3 or 4 occasions where they didnt put out what we needed above like 5000 to 5500 and felt like we were raping the maf/pe/ve tables just to get the AFR we needed. we confirmed on the dyno the fuel pressure dropping.
I believe it is a gray area and would really rather be safe than sorry from a huge lean condition.
Some of the other guys at the shop and the cars we have installed and tuned had no issues. I was sharing my personal experience and opinion on the matter.

HCI2000SS

iTrader: (2)

Fair enough. And that was with the hotwire kit as well?

tech@WS6store

iTrader: (2)

Yes. They werent just racetronix either. They were walbro 255s but 2 of the setups used a twin pump system with a hobbs switch from another company. The switch didnt work right and the second pump never turned on. So instead of relying on that, turning both on at the same time was the best option (but changing up the wiring of course) and had 0 problems after that. They were on system with larger feed lines and billet rails etc so even on the back end they required more fuel to fill. It is possible that just staying with the stock style system they will not run out of fuel as all the lines and rails are smaller and dont hold the extra volume these other systems did.

JoeNova

If you are going return style and can fit a Walbro 450, I would do that and call it done.

tech@WS6store

iTrader: (2)

The 340 or the twin 255 are good options as well. Racetronix basically has all the angles figured out on the fbody stuff when it comes to those.

WS6HUMMER

iTrader: (19)

I went sumpped 98 tank & Magnafuel MP4303. I was able to scale the 98 sender to work with the plastic tank cars.