Sard 800cc Injectors On Rb26

[Mark-32]

As the title states

[The Dan]

Big enough for what?

[The Dan]

What HP are you making now, what fuel pump or pumps are you using, do you have a surge tank.....more information is required

[R31Nismoid]

let me get my crystal ball out to find out the setup mods... or...

you could tell just us.

Can't expect us to answer if you don't tell us the constraints/parts etc.

for all we know you have stock turbos

[Mark-32]

Sorry im currently makes 330rwkw on 13.5psi on a built 26 with all the fruit on 98 octane.

Only have a single 044 intank at the moment but if its possible to run e85 with 800cc injectors i will build the fuel system to suit.

[Mark-32]

also its got -5 turbos and vipec ecu if that helps

[jangles]

more boost??

[R31Nismoid]

well those turbos on 98 will do 380-400rwkw.

so around 420-440on E85 you'd assume (roughly).

800 should just make it if not a minor pressure bump will get over the line.

[N1GTR]

I disagree, i had 1000's maxed at 403rwkw so i dont think 800's will cut it

Mind you thats 400cc bigger engine

Try it and see

[Mark-32]

more boost??

Yeah thats the plan. But to run more boost I have to build a fuel system, and if 800's are going to be big enough for e85 fuel then I would build the setup with e85 in mind. If they aren't big enough i wont worry about it. I was just hoping i would make more hp on E85 at 18-20psi than i would on 98ron on the same psi.

[Mark-32]

what about a 50/50 mix of 98 and e85?

Any point?

[R31Nismoid]

I disagree, i had 1000's maxed at 403rwkw so i dont think 800's will cut it

Mind you thats 400cc bigger engine

Try it and see

mmm… Well just doing some rough numbers - and I repeat, rough

700cc = 700hp/521kw (take off 70kw, drivetrain loss, yes I know that’s again, rough guess)

~440rwkw @ max/380rwkw @ 85% (PULP)

Then 800cc … ~530rwkw max/450rwkw @ 85% (PULP)

Friend of mine had ~300awkw E85 in an EVO with 1000’s and they were not nearly maxed – remembering AWKW so easily over 500hp @ the motor.

So ye it would be line ball. I’m surprised you had 1000’s maxed @ 400rwkw.

50/50 mix would be a ok though either way you'd assume.

I'm planning on getting Sard 800's myself, -5s and then going E85 if needed and rough numbers did suggest the 800's with a bit of a rail pressure increase would get me there.

If i max then so be it lol, I'll just go a 50/50

[jangles]

if you can build it to suit E85 why not build it that way??

Edited November 10, 2010 by jangles

[Mark-32]

thanks for that man thats what i was after.

I spose i just build the fuel setup so i can use both.

Now all i gota do is find out if an intank 044 feeding a surge tank then twin 044s will work with e85

[R31Nismoid]

Just for shits I just did the 1000's

1000/745kw ~675rwkw @ 100% (PULP)

People are quoting what, 25% extra for E85?

1000’s based on 25%... (675-170=505)

So 500rwkw max, 450rwkw @ 90%, 425rwkw @ 85% (roughly)

30%

470 max, 420 90%, 400 85%

Just theory of course. And not taking into account any rail pressure bumping and so on.

Real world would indeed prove otherwise

[N1GTR]

mmm… Well just doing some rough numbers - and I repeat, rough

700cc = 700hp/521kw (take off 70kw, drivetrain loss, yes I know that’s again, rough guess)

~440rwkw @ max/380rwkw @ 85% (PULP)

Then 800cc … ~530rwkw max/450rwkw @ 85% (PULP)

Friend of mine had ~300awkw E85 in an EVO with 1000’s and they were not nearly maxed – remembering AWKW so easily over 500hp @ the motor.

So ye it would be line ball. I’m surprised you had 1000’s maxed @ 400rwkw.

50/50 mix would be a ok though either way you'd assume.

I'm planning on getting Sard 800's myself, -5s and then going E85 if needed and rough numbers did suggest the 800's with a bit of a rail pressure increase would get me there.

If i max then so be it lol, I'll just go a 50/50

Dont worry, there were a lot of people surprised at that fact on the day (happened at SAUNSW dyno day)! Remember torque eats DC so im sure that played a part

Nonetheless that didnt work so 2000's went in and its all good now.

Using numbers from when we did the switch, it needed between 35/40% (cant remember the exact) more DC.

So 800's at 85% is 680cc, safe bet of 30% extra needed for the e85, that leaves 476cc - before drivetrain loss.

I wouldnt worry about an Evo result, its all guess work but we can at least use the same maker/cylinder count to try and get an outcome. Here's a spanner in the works; VR38's using 990/1000's are pulling big numbers and are seemingly ok for DC

EDIT: On E85 the temptation to screw silly amounts of boost and timing in is pretty hard to resist. Mine wouldnt knock, so before the end of the month its back on the rollers Its a good thing you've got Chris down there to stop you getting too overboard with it

[N1GTR]

thanks for that man thats what i was after.

I spose i just build the fuel setup so i can use both.

Now all i gota do is find out if an intank 044 feeding a surge tank then twin 044s will work with e85

A simple search will tell you that fuel setup answer.

[The Dan]

You need to know how many ms your injectors are open for at their highest. Then you can work out how much fuel you are using......exactly to 0.1 of a L and then you will be able to determine if you double it, you'll have enough. General rule.....if your injectors are more than 50% duty now, then no they won't cut it

[The Dan]

To give you an idea...Noel's setup makes 550rwhp and he chews through 7.8L/min of fuel at 7500rpm. He has 1600cc injectors at 81.25% duty cycle

[R31Nismoid]

410rwkw with 1600's on 80% ... holy fk...