blown 944

I like to use the petro scaling to keep things simple.

So if you are tuning for 12-12.5 now you would tune for 11.5

Some boards may be doing a conversion kindof a PIA IMO

porshhhh951

ah I see. So then i'd be looking for mid 10's on the air/fuel then. Cause I was wanting to run it a little rich.

blown 944

You won't need to be that rich. don't be scared

You will be fine between 11.0 and 11.5

porshhhh951

okay so 11.0-11.5 for E-85.

That will make tuning it easy then. I'll always just look for the same air/fuel. Im going to leave it around mid 11's on pump fuel too just to be safe. I'd rather have some safety margin with 93.

I told gabe to dial it to 17psi for 93. I think it will be fine. 22psi planned for E-85.

95ONE

wide band are lambda meters. they get the lamda reading and interpolate the afrs from there. so all things being equal..
The innovative has a pull down options list for fuel type and will read however you wan it. Its a great product

TurboTommy

Unless you guys are using a fairly healthy dose of timing, I would think you are leaving a bit of power on the table with 11.5 air/fuel. I don't think you have to go that rich for safety reasons.

porshhhh951

well if I understand sid right there is about a 1pt difference. So 11.5 is really like 12.5.

Any higher than that and you are getting into the 13's for a/f. Isn't that a little lean?

blown 944

Actually Tommy

I have dyno'd with less fuel and made less power 11.5 seems to be the sweet spot for best torque (11.0) and power

I could find that dyno sheet if you like, it went from 370ish starting at 12.2 on the top end down to 11.4ish and went to 410 hp only changes being added fuel. Over the course of 4 runs adding fuel kept adding power.

this was same dyno same day.

I have dyno'd it since and made more but the point is that more fuel = more power to a point and too much fuel didn't make more power but didn't kill it either. I haven't been able to adjust timing on this car but have been working with a couple people that can and they are able to run quite a bit of timing. At 12.0 and over thee EGTs' start to get ~ 1700 degrees so not quite safe

blown 944

just to be clear to anyone we are really talking ~ .8 lambda. The above statements are would be true with regular fuel but not E85

Weston Dillard

>>I have dyno'd it since and made more but the point is that more fuel = more power to a point and too much fuel didn't make more power but didn't kill it either.

Makes sense. I remember reading Smokey Yunick, who said engines on alcohol didn't seem to fall off as badly as engines on gasoline when you go too rich.

West

TurboTommy

Interesting Sid, thanks for sharing.
Yes, I know, alcohol can make power at quite rich mixtures. But, only if there's enough timing the way I understand it (rich mixtures slow down the burn rate guite a bit).

porschhhh951;
There isn't a 1 pt difference. The wideband sensor actually measures lamda (or equivalency ratio) and always assumes you're running gasoline and displays it as such. So, you just tune it with the same scale as gasoline.

porshhhh951

ah I see. I must have mis understood sid.

Well it looks like im looking for 11's regardless for 93 octane and ethanol. I've got to email john and ask if they v-flex software will add timing to the map automatically above 14psi on E-85 if it senses it can.

blown 944

Trying to be as clear as possible

I will just say that if you are reading regular fuel now, you do not change anything with your wideband. Just look for it to be ~11.0-11.5 .

I am not familiar with the Vittesse stuff but I doubt it adds much timing I could be wrong

porshhhh951

Yeah I just emailed john. I know its adds timing below 14psi but, I don't yet know how much and if it go's above 14psi when race fuel is used. Lord help me im actually going to try and fine tune this thing myself for E-85.

sid I might be calling you.

blown 944

Feel free

You wouldn't be the first

There are a few who don't post but just look here, that have converted and are very happy