7* of Knock from 2-3 shift at WOT.

[sholxgt]

The Shell 93 around these parts is no joke.

Hunter, are you in Cali by any chance?

I think that different areas of the country pull from different refineries or get different mixes.  My neighbor, originally from IL, talks about how good Shell 93 was up there and how cruddy it is here.  He has a Silverado SS and SSR.

Growing up in South FL, no tuners used Shell.  It was strictly Amoco or Mobil for any shop I asked if running 93.

I'm just grateful to not have to deal with 91.  I feel for you guys!

[Korn2012]

How far north in Wisconsin are you? Most kwick trips have e85 now.

[hunterbabich]

How far north in Wisconsin are you? Most kwick trips have e85 now.

The closest kwiktrip is a half hour away. I actually made a run there tonight and put a half tank of 91 premium and 1.5 gal of e85. (ending with something around 93 octane e12 or e13.) Poof, knock is gone at WOT.

[AJP turbo]

Did you re log?

[hunterbabich]

Did you re log?

Yes sir. With this new log i noticed a little richer conditions under WOT. 0.76. Before it was around 0.80. And fuel pressure kinda drops off after the desired afr is achieved. ~2200 down to ~1400. Im guessing this is caused by the higher octane.

[FoMoCoSHO]

Did you re log?

Yes sir. With this new log i noticed a little richer conditions under WOT. 0.76. Before it was around 0.80. And fuel pressure kinda drops off after the desired afr is achieved. ~2200 down to ~1400. Im guessing this is caused by the higher octane.

It should only be dropping if its commanded to drop.

At WOT you ideally want to see over 2K PSI.

As pressure falls so does droplet atomization (drops get bigger)which is not ideal.

The pressure should be basically static (tiny peaks and valleys) at WOT and the amount of fuel is determined by how long the injectors stay open.

Adding E85 requires additional fuel....that combined with richer commanded AFR..... probably the cause for the dip.

[hunterbabich]

So is the pressure drop anything to really worry about?

[FoMoCoSHO]

So is the pressure drop anything to really worry about?

Worry?

IDK it is something I experienced and fought for a long time with E.

While it is not ideal I'd rather have no KR and less pressure than seeing the knock sensor pull 7 degrees, that makes me nervous.

Ideally though you want that corn being sprayed over 2K PSI.

The more it is atomized the more effective it is in absorbing heat in the cylinder which is why corn is just so damn awesome at suppressing knock in DI applications.

[Korn2012]

I'd worry at the fuel pressure drop considering you only put 2 gallons of corn in.
What did Torrie say when you sent him the log?

[hunterbabich]

He said that is that is going to happen when you add e content and the air get better.

[AJP turbo]

He said that is that is going to happen when you add e content and the air get better.

You should never have your knock sensor maxxed out...and if only 2 gallons of E85 cause your fuel pressure to dip that much the you are running too much boost or boost isnt being controlled that well

[AJP turbo]

Your new log is kinda short. You only did a 1-2 gear WOT pull.....I'd be willing to bet if you stayed WOT for a 2-3 gear change your boost spike would be worse and your fuel pressure would've fallen more...2-3 is always the worst.

So you are about 1400 psi...If the 2-3 brought it down to 1200 psi and it's summer now then maybe you are close to 1000 in the cold....And you aren't getting tq reductions during shifts, I can tell by the spark curve during downshifts

Speculating a little here but when you see those big dips early in a pull with the knock sensor and then it goes flat that usually means your spark is set that you won't get any spark added from the knock sensor...But it is good on this pull that you didn't get knock retard

[16MagSport]

This is sounding like my wife's Explorer.  I was thinking about trying Unleashed, but this is exactly what I am afraid of.  OP, did you ever log your stock tune on 91 octane?  If so, what KR did you see?  I can only get crappy 91 Cali fuel.


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[StealBlueSho]

So is the pressure drop anything to really worry about?

Worry?

IDK it is something I experienced and fought for a long time with E.

While it is not ideal I'd rather have no KR and less pressure than seeing the knock sensor pull 7 degrees, that makes me nervous.

Ideally though you want that corn being sprayed over 2K PSI.

The more it is atomized the more effective it is in absorbing heat in the cylinder which is why corn is just so damn awesome at suppressing knock in DI applications.

I hate to say it...show me an Unleashed log where they sit at 2K through the whole run... I have not seen it... But then again... He uses nothing to control boost spikes... Those kill your fuel rail... He is 100% balls to the wall all the time... No tq control and no throttle control... Not that there is anything wrong with that... It's just his style... Part of the race car feel I believe is riding out those boost spikes with no reductions...

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[BOT_ROCKET]

I hate to say it...show me an Unleashed log where they sit at 2K through the whole run... I have not seen it... But then again... He uses nothing to control boost spikes... Those kill your fuel rail... He is 100% balls to the wall all the time... No tq control and no throttle control... Not that there is anything wrong with that... It's just his style... Part of the race car feel I believe is riding out those boost spikes with no reductions...

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Is that uncommon among the various tuners?