The power gained from E85 is mainly in the timing however because theres more of it it also cools the combustion air further.

And yes it burns cooler. EGTs are about 200-250 degrees cooler than what you'd see with regular gasoline.

As far as requiring special shit to run E85.. The only thing not compatible in a miata is the injectors. The rest of everything holds up fine. You dont even need a special O2 sensor, just run the regular wideband and tune for 12-12.5 afr instead of 11.5 for boost, 13.5-14 for spool up at atmosphere, and 16-17 in cruise and you're golden.

After switching to E85 it's actually normal to see your entire exhaust turn golden color while all the black carbon build up strips away. And at last alcohol smells much tastier than the soot of gasoline.

Some power gain is expected from switching to E85 on a NA engine, due to the higher energy content in the combustion.

( 81,800 BTU/Gal E85 / 9,8 AFR) / (114,000 BTU/Gal gasoline / 14,7 AFR) = 7,6%

Stated BTU/Gal for gasoline varies from 111.000 up to 114,500

Real life on non knock limited engines we've seen 0 to 10% gain.

Tommy

lets talk more about how SCers suck. or cats.

Turbos suck because if you run out of exhaust, the turbo stops spinning. Superchargers are better because if a belt snaps, the supercharger has enough momentum to keep spinning until you stop the car yourself.

Just in case you push the direct exhaust injection too hard you mean?

wtf are you talking about? e85 has much less energy content.



Ok I feel obligated to do this:

IF YOU DON'T HAVE PERSONAL EXPERIENCE USING/TUNING E85 PLEASE STFU AND DON'T POST ON THE SUBJECT.
KthxBi

Nope Pizza is right. It has a lower energy content per volume, but you need more of it. Look at the fucking numbers dumbass. He's showing e85 as having 30,000 less BTU/gal but you need a lot more of it, so it works out to having more total energy in the combustion chamber than normal gas. Chemistry.

Ting is I have experience.

And as is evident from The calculation, you need to calculate for the amount combusted.

Tommy

Listen dickwart, just sit back and let men talk.
You have proven your asshattery way too many times and not one single person on this forum actually takes your shitstained drivel as credible information because you're a fucking moron.

Get back in the kitchen bitch.
except your "calculations" are way off

I dokn't know wtf you're trying to accomplish bringing afr into this.....You don't need a consistent 30% e85 to replicate gasoline consumption. Unless you're a internet "expert" and really think that its consistent like that and have never tuned a car on e85 before.
The energy content of 1.0 US gallon of ethanol is 76,100 BTU, not 81,800.
Tuning strategies are different for the 2 fuels, and only boosted applications or ones with ultra high compression really take advantage of e85. Not a stock low comp BP. I KNOW you won't back up this stupid ass claim that Leafy and yourself keep trying to make, but I'll let you try:
How about posting said charts you speak of showing a 10% gain in power on a BP motor with n/a bolt ons...internally stock?

We're talking about BP's here. N/a BP's to be specific. Don't be a bitch and speak "generally" like the idiot posting above you.

The motor flows like ass. And isn't high compression or has trick cams. It has nothing to push said extra amounts of e85 (vs gasoline) and air through itself and take advantage of running cooler in the process due to the larger amount of fuel being vaporized.

I have personally tested ramping up the timing to kingdom come on e85 on an n/a engine and the gain was something pathetic like 3hp.




Don't pull a Leafy.
Its the fastest way to losing credibility on here.

Here dickface, Schenker's newest engine 93 vs e85.

http://forum.miata.net/vb/attachment...9&d=1332537353

13 hp gain up top, but the torque gain everywhere is more telling. Yes thats also 175 hp on an internally "stock" engine, N/A, without ITBs.

(114,000x0,15)+(76,100x0,85)=81,700

And I did not say BP

Will see about dyno chart next week.

Tommy

:rofl:

175-167=8
fail#1, dumbass

fail#2 dumbass

d00000000000000000ds.

Dammit, couldn't pull that fast one with the 13. Was hoping you just couldn't do math after disputing pizza.

That's what I thought.
And why I'm arguing this. We're discussing mazda BP motors here, not some fancy dual vvt honda motors running 11.5 compression. And even with those 10hp would be a good gain and 15 would require a lot of massaging of the tune.
What are you tuning next week?

:fael:

Was going to look trough the test run's we did when E85 first became available localy.

Don't have axcess to the graphs when not in the shop.

Tommy

You lose all credibility due to your poor grammar.

Let's see how good you do in Norwegian ;-)

Tommy

Let's not.