Limits of 550cc injectors running E85

[Chris32]

I've read and searched but can't find too many answers as most seem to opt for 1000cc injectors

Basic run down - HKS 2535/550cc KPM Injectors/Walbro 255 pump - 260kw at 18psi now

I never planned on using E85, however plans change My plan is just to fill it up with E85 and see where we get with the tuning

Given the turbo hasn't got much left in it, what's people's thought's on this being enough?

[Dose Pipe Sutututu]

They are too small, unless you bump up the base fuel pressure to 4 bar.

You'll need about 35% more fuel flow. Say if you're already at 80~90% DC then you won't have headroom for E85.

You'll be able to get more power out of your setup, as I can imagine you're pretty knock limited on 98RON with that small turbo. Don't expect miracles but a 10~15% gain in power is possible  

[Chris32]

Yeah I thought as much, may as well swap them out for 1000cc injectors and have some scope for further down the track/bigger turbo

[mr_rbman]

your walbro 255 will also struggle on E85, you'd need to look at changing out to the 460 while you're at it...

[iruvyouskyrine]

Bosch Motorsport/Injector Dynamics only

[joshuaho96]

ID1050x still has a very narrow spray angle, most of the fuel will go straight down the intake divider. Toyota made that work by using air assisted fuel injectors but as far as I know the RB26 has no such system and is much more reliant on the injector itself providing the spray pattern and atomization. Bosch motorsport has the 040 980cc injector which works great, just make sure you get a flow matched set.

[Dose Pipe Sutututu]

37 minutes ago, joshuaho96 said:

Bosch motorsport has the 040 980cc injector which works great,

They also don't mind high rail pressure too, at 4bar they become "1150cc" as most retailers advertise them at which is misleading. Just like how plenty of eBay retailers called the Bosch 1550 a 1650cc injector 

[statue]

I had 257 kw using 98 fuel: 525cc XSpurt Injectors and 255 LPH Pump at 20~18 PSI.

Told my tuner I just wanted E85 and see what it can do.

Tuner said not enough fuel pumping and had to upgrade to Walbro 416 LPH .

 

End of the day it made 295 kw 21PSI on E85 using 525cc Injectors at 100% duty cycle

 

In my experience, never go weak on fuel. I now have XSpurt 1000cc + 2xBosch 044's in a surge tank, the same 416 pump in the stock tank. Don't limit yourself just to upgrade it again later 

Edited October 4, 2019 by statue

[GTSBoy]

26 minutes ago, statue said:

In my experience, never go weak on fuel. I now have XSpurt 1000cc + 2xBosch 044's in a surge tank, the same 416 pump in the stock tank. Don't limit yourself just to upgrade it again later 

With the caveat that too much/many pumps leads to fuel heating problems unless you put the effort in to control the pumps properly.

[statue]

Yes, the second Bosch pump activates on high load, and I've been told the 416 pump can be downgraded since it only feeds the surge tank now.

[Chris32]

Got to 278 without too much hassle, swapped the pump out to a Walbro 460lph unit prior to tuning

As per most E85 results, picked up power and torque everywhere. Still some more left in it if I really wanted to squeeze it, but the tune was done with some upcoming track days so it's reasonably conservative

 

Happy with the results given the basic mods it has

[mr_rbman]

On 10/16/2019 at 2:19 PM, Chris32 said:

Got to 278 without too much hassle, swapped the pump out to a Walbro 460lph unit prior to tuning

As per most E85 results, picked up power and torque everywhere. Still some more left in it if I really wanted to squeeze it, but the tune was done with some upcoming track days so it's reasonably conservative

 

Happy with the results given the basic mods it has

good results, you appear to have very similar mods to my track car so will be interesting to compare, which dyno in Adelaide is this on?

 

[Chris32]

On 10/19/2019 at 10:07 AM, mr_rbman said:

good results, you appear to have very similar mods to my track car so will be interesting to compare, which dyno in Adelaide is this on?

 

Boostworx does all my tuning