E85 swap

[Griffin]

Is there any benefit in switching from caltex eflex to United e85.

I understand the e85 has a higher ethanol content than eflex. 

Will there be much of a gain after a return on United e85.

The reason on changing is more an availability issue.

[GTSBoy]

There's not really any benefit at all.  Once you get past about 40-50% ethanol the anti-knock benefits from extra ethanol are very small. 

[Kinkstaah]

I thought caltex stopped selling e85 many years ago now?

Only Vic?

[iruvyouskyrine]

Still sell it in NSW. And what GTSBoy said is correct, anything over 50% ethanol you already have most of the benefits of E85. If you question is "is the performance benefit worth driving an extra 30 mins to get united over caltex ethanol" then the answer is no. Might be 5-10kw and a tiny bit of knock resistance at best

[Dose Pipe Sutututu]

Run full flex, pour in anything. Or just tune it on United and run aggressive O2 correction (higher correction threshold and slightly higher P & I on the closed loop setting) so when it's on Caltex it's not overly rich. 

[Griffin]

I had to fill up with United. It doesn't seem to run as good as eflex. Not as crisp throughout the rev range.

[Dose Pipe Sutututu]

22 minutes ago, Griffin said:

I had to fill up with United. It doesn't seem to run as good as eflex. Not as crisp throughout the rev range.

tune related, what are your AFRs like?

I suspect it is too lean now, do you have a wideband? log it... a simple, albeit lazy way to correct this is to reduce the size of your injectors in the ECU so it sprays more. Lazy mathematics say you would need to decrease your injector size by 7% (given the lazy way to go from 98RON to E85 is to reduce the injector size by 30%)

[Griffin]

I'll just wait til I put the EFR on and get retuned. Where are u located mate?

[Dose Pipe Sutututu]

1 minute ago, Griffin said:

I'll just wait til I put the EFR on and get retuned. Where are u located mate?

Sydney, to be precise Canley Vale.

Also I only have access to RWD dynos (pre-empting the next question)

[Griffin]

I only use rwd?