I currently have one stock fuel pump assembley with a 255 walbro and another stock assembley with a walbro 255 but modified for the CJM fuel return kit. instead of buying a CJM twin pump assembly is it possible or has any one modified or made their own twin basket for twin fuel pump setup? sorry if this is a repost. if it is flame it and move on i guess lol.

 

Yes, it is possible - but will likely consume more time and money than buying the CJM twin pump. Also, the CJM twin pump uses Walbros, but not the standard 255s due to the split tank siphoning setup in the 350Z.

We have the CJ twin pump in stock if you need - give us a ring 859-230-9027 and we can ship out today.

 

Just get a Aeromotive 340lph pump and ditch the Walbro. Granted its not the flow of two Walbros, it should be plenty unless your going over 600+.

I'm running the Aeromotive with DW850's for E85.

 

My goals are Gunna be between 550 and 600 on e85. So guess il just sell the two and buy the one. Did u have to modify the aeromotive much? Are u twin or single turbo? And how far is ur injectors from being maxed with e85

 

You could also do a Aeromotive 340lph and then do an inline A1000

 

Or the Bosch 044 inline too.

 

The Aeromotive is drop in minus the mods to the stock basket, but yeah if your goals are that high, probably won't cut it alone.

I won't know for sure until I tune it, but if I did my math right I should be able to hit 450ish with a 70-80% duty cycle.

Binder ran a really similar setup with twin pumps and HKS 1000's at like 80% and made 650ish. Hopefully he will chime in.

 

I would want to stay around 60-70% injector cycle anything higher I get worried. so lets say i dont go with e85 and still wanna make 550 to 600hp on 91. I guess that gets a little scary too? i dont know. I bought my built forged performance short block from hwcustoms and he was running a single 255 walbro with 600cc injectors on pump gas and made 516hp to the wheels. I cant remember but Im pretty sure he told me he was at about 70% injector cycle with his setup. sooo..if i wanna make safe power goals i need to ditch my walbro singles and either get a twin setup or add inline pump to the mix..ontop of that get 850cc injectors for 91 or 1000-1200cc for e85. 600hp being the goal here. oh yah and an gt maf for my uprev. i have a cjm fuel return system as well that should help out

 

ended going with an aeromotive 340 fuel pump and 850cc injectors ACT streelitle act 6 puck clutch and uprev gt maf. hopefully throwing this in my setup will make and put down some better numbers.

 

Awesome man! I think you'll like the Aeromotive.

 

I'm sure I will thanks for the advice!

 

i'm here!

yes, i have hks 1000's and cjm twin pump. I was still rich (low 11, high 10's) for 652hp and 581tq. it was right at 80% duty cycle.

here's the ticket though. In order to get the injectors to supply that fuel I had to increase the base fuel pressure. Base pressure is set to 70psi so i'm sitting right about 60psi at idle. The car idles perfectly fine like this and allows me to run a "small" (for e85) injector with good power.

With the fuel pressure at 50psi base (40 at idle) i didn't get to dyno it but i was in the 80% duty cycle around 16psi. It would have maxed out a lot lower on power. I was at 22psi with the 652hp.

The thing about this is when you increase your fuel pressure the fuel pump will have more resistance therefore flow less. So bumping up the fuel pressure on the aero 340 would probably reduce it enough that it would'nt be able to supply the correct fuel. You can see one of their flow charts and have a look at what it would flow at higher fuel pressures. Remember to add boost on top of that to get a final pressure number. Mine would be about 92psi at max boost so quite a bit of pressure on that twin pump.

 

e85 going though 850cc injectors will be about like petroleum fuel going through 600cc injectors.

100% duty cycle for those injectors will use about 304 LPH of fuel so you will have a little overhead with the fuel pump as those injectors max out.

The ratio of increase in your fuel pump as well as injectors would flow about the same fuel as 600cc injectors on a walbro 255 on petroleum. Walbros can max out anywhere from 500-550hp depending which dyno and all that jazz (my single stopped at 507hp). I would expect the 850cc and 340 to max in that same ballpark with e85.

Again, all theoretical and with the error rate on fuel pumps it could be higher or lower. If you use a twin pump you could increase base fuel pressure and get those 850's working harder.

 

^ see you're a pro with that ****.

 

Ok so I am better off not running e85 with the aeromotive340 and 850cc injectors? sounds like I should stay with gas to make more power with that setup? What are you suggesting i do with what i have? i don't want to to buy a twin pump. if I make 500 to 550 hp i will be more than happy.

 

you will be able to make 550 whp with the aeromotive and the 850cc's. with a dw 300 pump and 850 cc injectors i was making 530whp on a dj and it had some room left still.

 

Which 340 PN do you use for it? Is it the universal one that fits in and just needs the stock basket modified? There's 3 PN's that i see for the 340.

 

Get the walbro 400 pump granted u have to modify the basket but it will supply more than enough fuel .

 

already have aeromotive 340 on the way..and I still have two walbro 255's and a stock pump to sell to get some money back lol.

 

I don't remember off hand but I can look it up when I get home.