I just purchased a used 03 evo 8. I had a buddy of mine hook up a data logger, and we did a few pulls while making some adjustments with the safc that I installed. My friend said that the ecu is not advancing the timing like it should. In addition, the car does not feel like it is pulling as hard as it should. At the track I'm all out to hit a trap speed of 103mph...and that's with a full 3" exhaust, intake, and 21psi. I was looking over the receipts that the previous owner gave me, and I noticed that the ecu had been flashed by Al from dynoflash.

The conclusion I have come to after having a few people look at my car is that the flash is bad. It was a mail in flash, which I know is bad to begin with. Has anyone heard of bad flashes coming from Al at dynoflash?

Any info you guys can give me is greatly appreciated. Thanks.

 

At 21 psi that seems to be about right. I reflashed NDGsx's car at PIR saturday and before his best was like 13.3 @ 101. There was a prelimn flash that him and I had done (I usually only mess with IX's since thats all I have) that wasnt quite on for 23psi, but after flash he ran 12.7 @ 105. What timing were you seeing and lets go from that?

Remember to that S-AFC adds timing when you pull fuel, so your timing curve not looking right will be directly related to where you have added or pulled fuel. A proper flash shouldnt need a S-AFC actually.

 

may I ask what mod do you have?

 

NDGsx has all the same stuff as what Djd24 has with the addition of a Hallman. I believe the breakdown is UR 3" DP, Megan Cat back. K&N drop in, and his and my flash for his car.

My car has Full TBE, hacked airbox w/ K&N, LICP, and my custom flash. I also have 275's which led me to bog on almost all my launches. I managed a 12.41 @ 109.1 with a 1.70 60', and a peak mph of 111.8 on a 12.62 run with a 2.02 60'. Everything else being equal if I had the same 60' I should have run a 12.3 on my peak mph pass.

 

My mods are:
Full 3" Buschur exhaust
Injen CAI
Hallman boost controller
Dynoflash ecu reflash
SAFC-II

I also have an AEM wideband in there too.



QUOTE: Remember to that S-AFC adds timing when you pull fuel, so your timing curve not looking right will be directly related to where you have added or pulled fuel. A proper flash shouldnt need a S-AFC actually.

What do you mean by this? How does the S-AFC have any control over timing?

From what I've seen other evos with similar mods do at the track, my trap speed just seems off.

Thanks for the comments...keep 'em commin...im tryin to learn

 

What the AFC does is "change" the airflow signal. When you go negative you are pulling out fuel and the computer sees a smaller quantity of air. With the lower amount of air the computer wants to add timing. You do not directly change the timing. Did I answer your question?

 

The safc tricks the ECU by changing the MAF HZ, therefore moving into different load columns. Negative fuel, it moves to the left, Adding fuel, it moves to the right.

 

Yes. I thought you were implying by your previous post that the safc directly changes the timing. I understand how the safc works...thanks for the clarification.

I'm going next week to get my ecu reflashed and road tuned. Hopefully I can sqeeze out a few more ponies and get this thing trappin around 108 or so...where it should be.

 

What kind of timing #'s were you seeing during the log?
What were your reading on the wideband during the runs?
Were you holding psi during the runs?
Compression check
Boost leak check
ect..

You think you have a base flash but that doesn't mean that it's tuned to the parts it has now since you bought it used. Unless you know the previous owner.
.

 

So it begins

 

 

Yeah, it could be that it was a base flash...who knows. Either way though, I still think the car would be running better right now on a stock ecu. We'll see how it acts next thursday when I get it reflashed.

 

def. do a boost leak test first! i was in the same situation and had multiple boost leaks! from now on thats the first thing i will always look for when power feels down...

 

Dont blame the flash - it's very minor.

You just basically bought a slowass 03 evo and need to add cams and alcohol to compete with like an 06. Sorry, didn't you test drive it?

 

Without my safc, my afr's were all over the place during a pull....the flash blows...it's way off. But, then again, it was a mail-in flash that was done possibly assuming no mods.

The car pulls very good 1st through 3rd. At the track, it seems to kind of die out in 4th. Somehing seems screwy with the timing...we'll see.