Just had a question. I jsut purchased an 04 EVO and looking at doing a few things to it in the very near future. I am considering a dynoflash and an SAFC, but a few people I know said I could get 95% of the power with only an SAFC vs SAFC+flash. Any input? Also do I need to get EGT+Wideband O2 like Zeitronix to use the SAFC. I only ask this because I know people who are using only the stock o2 and knock sensors to tune the SAFC. Also how necessary is a 255 fuel pump?

 

hands down dynoflash will overpower an afc anyday. after al tunes your car you will be all set, no need for purchasing o2 sensors. a 255 pump is always a good thing to have . especialy if you plan on more mods

 

is that even if it is a mail-in flash?

 

That is debatable at best.

the advantage a flash has over and AFC:
adjustment of ignition timing
raising of rev limits...not an advantage with stock turbo at all
removal of fuel cut...that is an issue unless you buy larger injectors.

the advantage an AFC has over the flash:
use adjustability
the ability to tune to conditions
ability to have seperate maps for different octane fuel
abiltiy to change settings to accomadate different injectors/fuel pressure change on the spot.

I highly doubt a flash will overpower a correctly tuned afc in any condition. That's just "Cheerleading" without any test data.

 

al's base flash is 110% better than any afc tune. not only does dynoflash make more power. but the factory ecu won't learn als reflash like it will the afc settings. just a far better product and no time retuning.

 

Ok either way gonna pick up the SAFC-do i need the wideband and EGT to tune it correctly? Or is there some I can do with the stock sensors?

 

The main advantage of the afc is it puts the tuning ability in your hands, and it's not a done once and that's it situation.

a flash tune might work great and be spot on in 90* heat in the summer on 93 pumpgas, but that flash is going to be worthless on 116 gas in the winter at 5psi more boost. The flash is also a detriment in that the tuning cannot be changed without hassle as your modifying the car. you want to be mailing your ecu around every time you change a part?

 

last time i checked an afc was a fuel controller. al definately is doing a little more than an afc. but then again you already know everything so you can explain it.

 

Just looking for info, not a fight. What about doing the both of them? And still wondering about the sensors lol. Thanks for the help.

 

to tune it as well as a "professional" flasher can on a dyno with a wideband, you need to have the same information as they do

wideband
OBDII dataloger.

with those items, you have the capability to make every bit of power a flash can under the same conditions.

AND the greatest thing: you get to learn about how your car works, vs trusting that someone else does.

 

Last I checked the ECU bases it's timing curve of the mass airflow meter.

The AFC simply adjusts the airflow signal from the mass air meter.

so the AFC adjusts fuel delivery and ignition timing at the same time inversly.

Im not looking for a fight by any means, and I dont know everything.

I do however know alot, as Iv been around the block modifying turbo mitsubishi's for 6+ years.

Im not going to argue with you, Im simply giving correct and accurate information. It may not be what you want to hear, but it's true and accurate.

 

doing both gives you the best of both worlds. you get the removal of fuel cut which is probobly the best feature of the flash. Raised rev limit. And added ignition timing.

The afc gives you used adjustability to fine tune your car to the currect conditions/modifications.

only downside is paying $ for "redundant" stuff.

 

Cool, jsut ordered the safc and logger should be here in a few days. In your opinion with just the SAFC, KN filter, and 3" exhaust how necessary is te fuel pump?

 

not needed at all. Im running the stock fuel pump still at 340whp.

 

Lol, thanks-anyone want to buy a 255 walbro lol. Do you still have stock injectors? And what do you reccomend after SAFC, wideband and EGT? Or is it just preference then? Also any tips on KN drop in filter vs power intake setup?