Will A Single 450L/ph Walbro Support 400Kwatws?

[jet09s]

Hi guys first post for me,im new to gtr's.I have just recently bought a r33 gtr from Adam at JEM.It currently makes 343kws at the wheels on 20psi.

My plan is to switch it over to United e85 with an end goal of 400kws at the wheels.IT has a precision 6266 turbo and other supporting mods.At the moment it has an 044 intank,i was thinking of replacing this with a walbro e85 450l/ph pump and replacing 750cc injectors with some bosch id1000s.

I have asked Adam at jem and he said in theory this pump should do the job,but has not personally done it.

Your thoughts guys or experiences would be great.I will directly wired this off the battery thru a relay to get good volts to the pump.I have used the search function,but could not find an answer.

[JH32]

From the last page of the RB26 dyno results thread:

forged bottom end

stock cams and valve springs

metal head gasket with ARP head studs

precision 6266 0.84 T4 divided rear

3.5" dump/cat back

GFB EX50 50mm external gate

1200cc injectors with walbro e85 pump

power fc d-jetro

409rwkw @ 26psi on Caltex eflex E70, at the limit of stock cams and injectors

[jet09s]

Thanks JH32,looks promising.Appreciate it,

[jet09s]

No one else,explored the limits of this pump?

[Piggaz]

Have you found a flow chart?

[GTR_JOEY]

possibly buy bigger injectors just to give urself some more room... id2000s maybe?

[jet09s]

At 13.5v and 40 psi rail pressure it advertises 430l/ph and on 12v at 40 psi it flows 375l/ph.I plan on running a direct feed to get near 13.5 volts.So at 40psi pressure should outflow 2x 044s.I was toying with the idea of the bosch id2200cc injs.Thanks guys

[Piggaz]

What does it flow with a base plus boost?

I'm sure it'll fine. As for 2000's, just do it and forget about it. Fuel system done.

[jet09s]

Not sure on that one piggaz,i think I will go straight with the bosch id 2200cc or similar brand.Car has haltech platinum pro plug-in,should handle the big injectors ok.Thanks guys.

[Piggaz]

Not sure on what mate?

[jet09s]

Base plus boost flow,

[urtwhistle]

Have a gander at my attachment.

I wrote a pretty simple spreadsheet for calculating and comparing different fuel systems for my car. Obviously it's to suit my setup but could be easily tweaked.

I have highlighted all of the cells you need to update then see sheet 2 and graph's it all out.

IE set the highlighted cell to your desired base fuel pressure. write out your hp and boost based off a close dyno sheet. in my case when it was tuned for bp98. and then fill in the injector flows and corresponding pressures.

with this info it tells me that my injectors are too small for me to convert over to E85 and keep my same HP. unless I either run a 70PSI base pressure or go about an 80% duty.

fuel calcs.zip

[jet09s]

Thanks for the tables,

[urtwhistle]

Remember my sheet is very rough. I can't remember what % of engine efficency I based it off but I think it was pretty low.

[jet09s]

I will keep it in mind urtwhistle,thanks

[SS8_Gohan]

my fueling is a single Nismo intank pump, good for 400 - United E85

i'd have a crack with your injectors as well... you might be surprised.

[jet09s]

thanks ss8 gohan,will go with the e85 450l/ph pump.Still tossing up on the injectors.Tuner thinks 1000cc ids will do,but a lot of guys on here think the 2000cc are the go.Most suppliers will warrant the 1000cc with e85 but not the 2000cc,Will do some more research.Thanks all,for ideas and tips.

[SiR_RB]

Out of curiousty has anyone maxed out a walbro e85 intank pump?

If so: what base pressure where you running and what boost (psi) ?

[portaz]

I spoke to jem too and they hadn't done it yet which suprised me as it been done many times by others so yes it will do it in answer to the original question.

Scott

[Kinkstaah]

So, general consensus is id2000's are 'safe' for e85 now also?