Nicest/best way to tune fuel on the DISI motors?

[9Hooker]

Greetings.

I'm new to Mazdas. I've been wrenching on Hondas for a long time now, culminating in a 12 second all motor daily driven Civic.

My questions is this:
After looking a the dyno graph of the top mount intercooler upgrade, something came to my attention. The a/f ratio with the upgrade is considerably leaner than before the mod.

Is there a reliable way to tune a/f ratio on the Mazda DISI motor? In Hondaland we could do many things, but the tried and true method (both forced induction and NA) was using something like the Apex SAFC/VAFC to add or take away fuel at certain points along the rpm band. It looks like the DISI motor is running too rich even for a turbo setup. Lean it out a bit, recoup minimal gas mileage, but make more power more efficiently. AND I've got more than a little to complain about the fact that Mazda uses a MAF...

BTW, I just purchased a Platinum AWD base model without any frills.

 

[9Hooker]

editing not working here? website censoring? What gives?

http://www.street unit.com/product_p/420-a904.htm

 

[Platonium]

Don't know too much about how to tune these motors, but I agree it runs rich. Wait a week or so and look at the inside of your exhaust finishers....black as coal. I think because of the DIsI/High compression ratio/Turbo combo they throw more gas in the mix to keep the charge cool to avoid ping and knock. Playing with that ratio is something you may want to look on the Mazdaspeed3/6 forum...they may have some tricks.

 

[9Hooker]

I agree that they have added fuel for the uninformed person that would just go out there and plug away with 87 octane. The reason the DISI can get away with higher compression ratio is mostly because of the direct injection vice multiport injection. Must go troll MS6 forums....