x2,should my race gas AFRs,be ok on E-85??

 

I aim for 0.8 lambda these days, then a bit richer by redline. I used to run it richer, but 0.8 seems to make more power than 0.75 i used to have..

If your WB can change the gas type, change it, if not - use gasoline AFR. It doesn't matter. Everyone uses gas-configured widebands for the most part and uses those numbers when talking about it. So aiming for .8Lambda would mean you'd see ~11.7 on the WB.

 

but isn't lambda for Ethanol like 9:1 ?

 

Something like that, but using gasoline AFR representation is kinda becoming the norm at this point because there's less screwing around that has to be done with the WB when switching between the fuels. I've read enough now that its easier for me to make comparisons of E85 AFRs using gasoline translation of lambda. Most people are saying that 11.5-12.0 (gasoline AFR) is the sweet spot for E85.

 

so the recommended AFR for gas and E85 should be the same?

ie fuel map wouldn't change much, just inj scaling?

 

Its looking like people are getting best results for E85 when running about 0.5 point leaner than pump gas.

I'm finding that for after I've dialed in injector scaling and injector latency values for both pump gas and E85, AFR under pump gas is a bit leaner than E85 for the same fuel map. For true flex fuel, I think interpolation for injector scaling and fuel map are both needed.

 

cool.

well im still waiting for your results with the FIC's before venturing out there

 

Mr. Fred is it safe to assume you did get the e85 in and scaled? Grats if so anyway I was wondering what changes you ended up with on scaling? On my first tank i simply scaled down global but then after burning a few gallons i went and topped off and after about 125 miles total driving i ended up having to rescale my latency values and redo the global. I tend to target the negative scaling values as too much fuel is better than not enough IMO.

I have been slowly cranking up the boost without altering fuel or timing from my 91 maps and I hit 320 on 2byte load today at 4400 rpm and 300 at peak 3400 rpm no knock whatsoever 27psi peak boost and I'm holding 21 at redline but wgdc maxed out .

I use an apexi turbo timer that has o2 gauge that shows both lambda and a/f it is hooked up and calibrated to read from the lc-1 spare wideband out. You can toggle the display to read lambda or a/f on the fly. I primarily key off of A/F cuz it is what my simple brain is used to referencing.
PS for me when trims are still adjusting the car will dump extra fuel up top

 

I'm liking the SARD idea of 2 holes in each injector to minimize ill effects of larger injector. The injectors seem to be twice the money of the FIC's or RC but if I had 2 do it all over again I would venture to try the SARD's or even the HKS especially if they are based off the Denso units.

 

I've got a tank of E85 in the car now, but its probably more like E70 because there was at least 1 gal of pump gas in there. For the first cut, I reduced the injector scaling to 70% of the pump gas value. Both trims are right on the money after driving around for a few days. However, one of my injectors is probably leaking and the fuel is more like E70, so I'm holding off on any scaling comments until after I get another tank of E85 in there and make sure I have a non-leaky set of injectors (another set of FIC 1050s coming soon). I really want to get past this stuff so I can be where you're at. Based on what I'm reading, it seems like the peak power with E85 and the stock turbo is happening around 5500 - 6000 rpm where the stock turbo can still make some good boost. I can't wait!

 

Y'all are rich ain't ya? I wish I had money to have a E85 Evo! =X

 

The E85 essentials are only injectors and a Walbro. Cost is no more than $450, and both are relatively easy to install. I think an E85 setup must be the best HP per dollar option available.

 

I would love to see some MPG figures from E85...

at the moment I am averaging 12.5L per 100km's on pump (98RON)...

 

I've been averaging 3mpg on my E85 setup.

Larger Walbro
1000cc injectors
Aeromotive FPR
-6 feed lines
AEM standalone ECU

The 3mpg figure is low b/c I only use the car for racing, so that's lots of WOT driving. We have a local rally testing facility with a 2.5 mile course. I went thru 30 gallons this past weekend and did a hair under 100 miles of driving. Luckily E85 was only $2.99 when I stocked up.

Dave

 

I figure about 25% less mpg due to pumping approx. 30% more fuel and maybe 5% greater efficiency equals 25% less mpg which is almost exactly how much less E85 is than 91ron/mon in my neck of the woods.

Since I am always on boost I went from 15 to around 12.5 mpg 91 to e85 this is mostly city and backroad driving and it seems I'm on boost almost every gear.

I know I'm redundant more than usual tonight.

PS I'm still wanting to try those SARD injectors as they might make the idle smoother. It's not bad mind you,but it's not stock either