Does the flash eliminate the need for having an SAFC or other fuel controller? or is it still a good idea to have one?

 

With the Dyno Flash its tuned to achive a target a/f ratio of apporx 11.1 / 1. There is no need to use a SAFC II or other piggy back device.

However - MANY of our customers have used a SAFC II or other piggy back for one of the follow reasons

1 - To fine tune a through the mail flash to better match a individual car (with wideband 02 sesnor or dyno)

2 - To run a slightly leaner a/f when running race gas

3 - To adjust for modifications added after the Dyno Flash is set

4 - As a monitor

Hope that answers your question

 

yeah thanks,
Im trying to decide on the SAFC or just a flash. What other advantages does the flash have? Like you said, The SAFC is adjustable with new mods whereas the flash isnt without getting it again.

 

the flash can control timing as well, the s-afc doesn't

 

You'll have a very nice fat torque curve in the middle of the power band till redline with the flash. Very ideal for everyday spirited driving

 

The main issue with the afc and piggy back type devices is that in order to adjust a/f ratio they alter the LOAD reference

The problem arises when you need to correct the super rich a/f of the stock evo ecu then you need to make significant percentage corrections to dial in the proper a/f target. When you put such high correction percenatges you also move the reference into a new zone of the IGNITION timing maps. The problem is that the ecu recognizes this altered load signal as a PARTIAL load and hence those areas of the map have significantly advanced timing numbers.

In most cases with SAFC II tuning we see significant knock activity as a result of this overly advanced timing.

The problem with SFAC II tuning is that it is generally very unsmooth and lacking in trq

With the reflash we can keep the same load signal - rewrite the a/f targets and not have an unitended effect on ignition timing.

Obviosuly with the ability to INDEPENDANTLY alter a/f and timing we can achive a much better result than a device that effects both at the same time.

Hope that answers your question

Just for your information - on this page you can see a direct comparision of the SFAC tuned very lean to the Buschur Flash tuned to a 11.5 a/f and see how much harder and stronger the tq comes on with a reflashed ecu vs. the AFC

http://www.buschurracing.com/EVO_Stage3.html

 

Why does the torque curve above 5500 look better on the Buschur SAFC dyno?

 

Those sheets were done on different days - different weather and differnt conditions. The SFAC II curve was also done a bit leaner if I recall.

While the Buschur Flashed set up was made extra conseravative as we were designing it to be used for through the mail flashing - with a huge margin of error.

The main point of the comparision is to note the general shape of the trq curve and how the reflashing effects when the trq comes on.

Here is another example of the same type of comparision between SAFII and reflash

http://www.buschurracing.com/EVO_Stage4.html

 

I use the afc with my flash to lean out the a/f on race gas. Works great!

 

you will be much happier with al flashing your car than a afc.al definately makes more power throughout the powerband than a afc.much more torque as well.