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Will 800Cc Inj On Rb26 Be Big Enough For E85

Mark-32

By Mark-32,
in Engines & Forced Induction

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Mark-32 Community Regular

Mark-32

Posted
Posted

I have done a search but cant find a definate answer....Engine is rb26dett.

If using twin 044's, with twin entry rail etc, will 800cc injectors be ok if i just bump up the rail pressure, and If so to what power level?

My 800s are pretty much brand new sards so If I could keep them instead of having to buy new ones that would obviously be the go.

Any help is much appreciated. Cheers

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Given he asked what power level - estimated you'd say 400rwkw would be the limit. Maybe a tad more, maybe a tad less.

With bumped rail pressure my 700cc Sards are @ 65% max duty with 360rwkw on PULP (20psi).

So 400rwkw on 700cc/E85 (allowing for 35% extra fuel) would be 100% duty with the bumped rail pressure.

So you could say the 800cc on a 2.6ltr might just scrape in. But you won't know till you get there.

The Dan Grand Master

The Dan

Posted
Posted

We have seen a couple now max 1200's at 600hp on the nose at the wheels. That is tuned logging individual cylinder EGT's.

The others that we have done seem to come in at around the same ratio so I would say 400hp at the wheels would be a fair guess as to what you could make safely on 800cc injectors but as N1 said, every setup is different and it will all come down to fuel flow and the rest of your setup.

The car we just had tuned on 1600's made 610 on 22psi and uses just over 9L/min of fuel at peak power. Not sure on the duty cycle yet but I can report back if anyone is interested (could calculate also but not sure on the exact L/min rate right now).

We are also about to wind 2 bar into it and crack 700 at the wheels. I can report findings on fuel flow and injector duty if it will help you guys out?

The Dan Grand Master

The Dan

Posted
Posted

Yeah cause as we've seen, some tuners love 10:1 AFR's lol.

That is certainly going to damage the duty cycle.

And rightly so. If you can't run 10:1 in places of your tune then your fuel system is inadequate.

Every car we have tuned runs 10:1/10.5:1 at some point. Usually at peak torque or there abouts. But then again, none of the stuff we have tuned anymore ever blows up....ever and it's only since using this tuner

Mark-32 Community Regular

Mark-32

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Ok well I wasn't really after a smart arse answer, I realise every setup is different but anyway the car is running dash 5-s, vipec, cams, etc.

At the moment it only has single 044 intank at 320rwkw

I have a fuel system for it consisting of 2x 044 twin entry rail and at the moment only the 800cc injectors fitted.

rob82 Mentor

rob82

Posted
Posted

We have seen a couple now max 1200's at 600hp on the nose at the wheels. That is tuned logging individual cylinder EGT's.

The others that we have done seem to come in at around the same ratio so I would say 400hp at the wheels would be a fair guess as to what you could make safely on 800cc injectors but as N1 said, every setup is different and it will all come down to fuel flow and the rest of your setup.

The car we just had tuned on 1600's made 610 on 22psi and uses just over 9L/min of fuel at peak power. Not sure on the duty cycle yet but I can report back if anyone is interested (could calculate also but not sure on the exact L/min rate right now).

We are also about to wind 2 bar into it and crack 700 at the wheels. I can report findings on fuel flow and injector duty if it will help you guys out?

Wow have you got a flow gauge that does 9l/min - where do I get one of those?

The Dan Grand Master

The Dan

Posted
Posted

Wow have you got a flow gauge that does 9l/min - where do I get one of those?

You trolling me or are you just clueless?

Calculated fuel flow based on the EXACT ms open time of the injector at peak power. The injectors are being told to deliver that exact amount of fuel. So where to get one? windows has a calculator or you can buy one from any newsagent

Gav Mentor

Gav

Posted
Posted

I'm now seeing 620 rwhp on E85 with CDI ignition allowing/accepting much more fuel. This is despite my modererate 2860-5 low mount turbo setup. My HKS 1000 CC injectors are at full duty cycle at max torque.

In hindsight, I would have gone to ID2000 (2000cc) injectors as the HKS units weren't "plug and play" in any case.

I'll take the opportunity again to express how impressed I am with the billet.net.au CDI kit (M&W CDI + bracket + harness etc). The spark strength allows bullsh*t amounts of E85 fueling midrange and just wakes up the turbo response. Forget your Splitfire/Twinpower combo.

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