initial wideband-less tuning

[zachsEVO3]

So I'm making sure by the time I get a new battery an alternator in I can at least drive my car to get it tuned properly now that I have installed the new computer setup.


I had keydiver convert the stock boost gauge to a knock-sum gauge and set for my 660cc injectors.

To that I added a GEN 2 MAF translator that works like a better SAFC I can also adjust timing with, again thanks to keydiver. It also does that cool wideband reading and tuning thing but I don't have a wideband yet so anyway...


Would I be safe making lil' adjustments using the knock gague and simple narrowband a/f gauge I have on my A-pillar?...its just one of those red-yellow-green-red light bar ones haha.


Amongst the folder-o-stuff from previous owners I just found a chart plotting Air/Fuel & boost psi (y axis left an right) vs RPM (x axis) from a base dyno run I guess. It goes from 2500rpm to beyond 6500. Would this be of any use to me?...looks like i could at least need a new MBC because the psi drops from 20 at 4k an drops to somewhere around 17 at 6.5k. Is this something I should address?

 

[jrohner]

There's plenty of us who tuned at one time without a wideband.

The chart you're talking about won't be of much use to you unless it's with your current setup.

 

[JayRolla]

Yes you can make adjustments but how would you know to add fuel or pull fuel. Did keydriver set you up with a new WOT fuel map. If so its most likely 11.1 afr. If not you will still be pig rich because the stock afr is real rich meaning you would need to pull fuel at wot. A lot of people dont understand but when you start to run high boost the fuel pressure also increases causing you to run even more rich with more boost. So what happens is people set up there injectors and start to add fuel thinking they need to because they added boost. But this is usually wrong.

At 30+psi I have to pull about 25% fuel to get a good 11.5 afr. If I run stock boost I have to pull less fuel, about 12% due to the rich stock AFR.

I say get a wbo2 ASAP or bring it to a dyno.

Also you mbc is ok. The 16g's have huge issues with holding boost. I hit 32psi on my 16g and at redline its at about 26psi which is better than most. Usually these turbos fall to about 22psi by redline.