Not at the lower engine speeds we are talking about. Max EGT at this speed will be in the 1300-1400F range-- well below what anyone would consider an over-temp condition. At high engine speeds the situation changes because thermal efficiency of the engine starts to suffer more and more. This is why it is common to counteract that trend with additional fueling. But thanks for trying.

 

Nope, that's not what I am saying at all. Gradually adding fuel is different than .6 AFR sweeps in and out. You also have timing changes to keep in mind like you said. You stated that you had to add fuel at 6k ish right? That was with your SAFC right? Before you where able to make timing changes correct?

I apologize if it sounds like I am attacking you everytime Warrtalon, I really don't mean to sound like that, I realize I can sound a bit aggressive when I post. I am just glad we are actually talking about tuning now, even if it is just between you and I at this point.

I think you are right about the AFR scaling being tighter on the other chart, but my AFR only fluctuates .2 AFR. Again, is the AFR curve the end-all of tuning? No, there is also timing and boost pressure to address, egt temps, etc. I had some knock in the 6k region and I took care of it with timing control and adding a very small amount of fuel. Notice how my AFR is ramping down very smoothly and ever so slightly towards 6400 rpm? Then ramps back up.

 

With one fast dyno pull you may be correct

But what about in an agresive driving condition doing a full 3rd gear pull and then shifting into 4th comming off a corner for example ?

The work you do speaks for itself in black and white

12.0 / 1 a/f at 23 psi is certainly ONE way to tune - its just a very agressive style for 91 octane and IMHO does not leave any margin of saftey for a bad tank of gas

I choose to tune a bit more on tyhe lower boost side and richer a/f which makes the car virtually impossible to blow up on the stock ecu

 

Sure, that's fine. Again, I am not even saying that this particular tune is any good and have no basis for defending its current shape. I was just trying to bring things back into perspective. It could have been a mail-in flash, it could have been a road tune, it could have been a dyno tune, it could have been any of the above with parts added after the tune. I don't know any of those details, but they would help...

 

I don't personally tune 23 psi of boost at 12:1 AFR's either on 91 octane nothing good can come of it.

Looking at the graphs Al copied and reposted it is easy to see how one tune would make more power than the other.

Substantially more boost and subrstantially leaner AFR's on the after tune. I would hope it would make more power. I would not run that tune in my personal car, regardless of who was doing the tuning.

Guess we all have different ways of making HP. I think in this case maybe an ego got in the way doing it. I do not feel that tune is safe on 91 octane looking at the boost/AFR's.

David Buschur
www.buschurracing.com

 

The IX I am tuning on pump gas and alochol just made 503 tq and 396 whp - stock turbo. I like the IX's

 

What RPM range are we talking about here...?

In the chart, all the AFRs are similar > ~5500rpm.

 

Basic stuff really

 

I guess not basic enough from the looks of it

 

Flatterd of course that a master of tuning like yourself is now using my words in his signature, you honor me

Now will you answer the questions I have posed or will you continue to avoid discussing WHY has the car so detuned from the factory ?

BTW - do you think you are the only person on the planet who can adjust a fuel map lean and retard timing ? There is no "trick" to running a car lean. Going a bit richer does not cost you much power - but it may not get you as many bragging rights with your peak power #'s

I think most professional tuners would agree that 12/1 a/f and 23 psi at peak tq on 91 octane is a bit on the agressive side

I dont even run my race evo that goes on VP import that lean as I am the one who would have to pay to fix any blown motors - why risk popping a head gasket for another 15 whp ?

 

what mods does this car have???
stock turbo really?? totally stock or a 20G or WR??
pure alky, or water mix???
what kind of dyno??????

 

2.3L stroker
https://www.evolutionm.net/forums/sh...d.php?t=178448

 

one more question
how much has the evo 9 head been redesigned??
i have heard something about water cooling jackets being moved, but what else?

this may be off topic,, but atleast i'm not starting a flame fest.....

 

<e>

 

Never before have I witnessed such poor grammar among a group of adults..
The worst part, I do it too.
crap.