i would have expected much larger gains especially going from being completely untuned

 

mcwop, did you not look at the "before" AFRs? I've never seen an untuned Evo with 11.5 AFRs across the board. The tune has to get power from somewhere, and if the AFRs are already in the mid-11s, where do you get power? Timing? Stock timing is already pretty aggressive, so that leaves boost.

 

good point, i never saw the stock AFR on my car on a dyno so I didn't even really think anything of it. I had assumed that the mail-in I had was fairly conservative and therefore ran a little rich so as to not chance running lean from car to car. Is it normal for a dyno like this to be so jumpy? My dyno from Al's mail-in and the subsequent custom tuned dyno was really smooth.

 

+1

 

No, this is very strange for a Mustang Dyno. I don't know if they have smoothing settings like Dynojets, but usually the curves on an MD are super-silky smooth no matter what the tune looks like.

Usually, our stock tunes start relatively lean during spoolup, then gradually enrichen to 5200rpm, then after that they start to fall off a cliff and go into the 9s on the top end. We usually have huge gains on the top end, which is where we see peak WHP, because we take that 9.xx AFR and bring it back into the 11s. In this case, most of his tune included ADDING fuel to make the tune safer, although it did get leaned a little up top where the boost tapers so much.

 

that explains why my gains were pretty much uniform from 4100RPMS and on.

 

they have a smoothing factor that they can input but the graph they gave me was with lilttle to no smoothing

 

oh and before this gets out of hand im not tryin to doubt AL or his tuning just posting up info to see if its normal for the a/f's or if its somethin that needs to be adressed

 

obviously there are very different ways of running a car, however, going from mid 11's to high 10's AFR isn't exactly making more power (in fact it is most likely losing power). if he richened it up to get out of the knock, it would have been just as beneficial to use less timing, or less boost. just because the octane rating of the gas is 91 instead of 93, that doesn't mean running it even richer. it just means the fuel is more suseptable to preignition. thus intake temps are to high (to much boost), or the timing advance is causing knock.

 

anyone else have anythoughts...

 

Exactly!! Look at my sig (the dynojet reference )

 

how much of a difference is it between a mustang and dynojet

 

Justin, (srt2evo9)

Thanks for calling over the phone.. Please allow me to throw my inputs regarding a Evo 9 tuned by the same tuner(Dynoflash), dynoed at the same dyno(mustang Dyno) from the same shop(Iaperformance), raced at the same track (SIR) and with similar mods.

I was present when your car was being tune, ironically you were out of town. I swear up and down your car sounded simply awesome, it ran excellent, even your father was absolutely impressed with the tuning as he drove the car as stolen.

Your numbers on the dyno are not bad at all, Evo9grl ran a 12.2 with similar power in AZ. We are in a location where the gas simply sucks. Don't be dissapointed so soon, everything can be fixable.

Dynoflash has a great policy of customer satisfaction, he is coming back in January and I am sure he will be willing to look at your car if needed. Now days you can't really say a car is slow just because of the dyno numbers, some evo members(Warrtalon,Evofunk and many others) would throw that theory out of the window.

The tune we had from dynoflash on the Evo 9 was exceptional, we gained in every single aspect and off course the car ran much faster at the track.

The AFR readings I was aware off already, I knew the Mustang Dyno AFR from Iaperformance differs about a point off. I might scan my AFR on my Evo 9 from the same dyno and shop and that would give us perhaps a starting point.


When I recommended you Dynoflash I did not ramdonly recommended him just because, I have a very positive experience, my cars are fast bullesproof daily mean street machines with zero reliability issues.

Carlos

 

the way mustangs read all depend on the dyno operator.

Warr perfectly described the way the fueling map is on the Evo VIII. From what i remember, back when the IX's first came out. There was a few different fuel maps from mitsubishi. And one was considerably leaner compared to what we were used to on the VIII. I believe all the big tuners observed this.

If the car wasn't previously tuned, then the customer did not recieve his "guarentee" that is promised.

And already pointed out, fuel isnt the only way to suppress knock.

 

The one thing that really caught my attention is that Justin's car(srt2evo9) put huge impressive numbers already without the tune giving me the sense that he put the standard high for a mustang dyno and no tune.

In other words, the margin of whp/tq improvement with a tune is smaller.

Carlos