1000Ccs Maxed Out At ~500Hp? E85 + Walbro 460

[kaneryan]

what he said ^^^

mine were gonna be getting around the 100% around the 360kw mark with an E85 walbro pump so i upgraded to 2000cc inj. food for thought

[Ben C34]

what he said ^^^

mine were gonna be getting around the 100% around the 360kw mark with an E85 walbro pump so i upgraded to 2000cc inj. food for thought

Did you check and monitor fuel pressure on the dyno?

[kaneryan]

not sure man, Tuner did it all. what he says i would trust as his work is the best!

[TheGeniusMoose]

So I've just taken this ryco filter out..

Cannot blow through it. It's clogged so bad it's not funny. As in, air goes in and doesn't come out the other side clogged .

[TheGeniusMoose]

Replaced filter, 80% duty in 3rd at 7500 rpm. Not sure how that compares to 4th gear on dyno however.

[kaneryan]

from my experience hearing from people running E85 i dont think you get much change from 1000cc inj, after about 350kw

[TheGeniusMoose]

The guy that built my car is running same injectors at 440kw in an r32 GTR and a T88 which has me confused.

[kaneryan]

from my experience hearing from people running E85 i dont think you get much change from 1000cc inj, after about 350kw

**** running E85.

is the guy that built your car running E85?

correct me if im wrong but running more fuel pressure you can use less duty cycle??

[iruvyouskyrine]

Correct as more fuel gets injected for the same period the injectors are open.

[kaneryan]

well makes sense as i was running high around the 360kw range on e85 20psi so i swapped out my 1000cc for 2000cc standard FPR

[Kinkstaah]

Replaced filter, 80% duty in 3rd at 7500 rpm. Not sure how that compares to 4th gear on dyno however.

This was my exact experience.

I have heard other people run into walls at ~330-370kw with mysterious fuel problems on R34's when everything else seems ok, replace the filter. At least on E85.

I upgraded to 1400's thinking my 1000's had maxxed out but found out that wasn't the case. 1000's on e85 seem to really get hairy at 400, though some people reckon they've done 450+ on them? Can never really have too much injector headroom nowadays anyway. Good enough excuse to upgrade

[Simon-S14]

if your car was tuned with a partially blocked filter and you have now replaced it, then the fuel map will be out on the tune. will probably need a touch up

[scotty nm35]

Correct, the entire map will probably be rich now.

[cobrAA]

Exactly, that is how we found the flow was dropping off. You have no idea what is happening without a gauge on the feed line, and you need to be on a dyno if the gauge is in the engine bay.

Speaking of which, it seems some factory regs can be too small for the 460L pumps, they don't bypass enough. The S15 I worked on recently was tuned at 60psi at idle, no wonder the car wouldn't idle well with twice the fuel pressure it should have had. It is definitely an important test that should be checked after any major fuel system mods.

are the nismo considered factory reg ?

[scotty nm35]

No, they seem to work fine. I only realised the SR regs were too small after having idle issues on petrol after installing a 460L intank. Checked the pressure and found it way too high. Perhaps the RB's will be fine as there are 2 more injectors bleeding fuel pressure off...

[ltcree]

Not sure how big the lines are on a r34 but my 33 had 6mm id lines (stock) and I had too upgrade to 8mm id line as it was restricting flow.

[TheGeniusMoose]

Confirmed all good now!

[PranK]

Confirmed all good now!

What was the final silver bullet? Was a retune required?

[TheGeniusMoose]

Retune will be required but that'll be a next week thing. Whole map is rich now.

[Kinkstaah]

holy shit someone benefitted from my various miseries

karma come at me

any time now