Tuning with ssafcv2

[Dr0]

I have not hooked anything up for datalogging yet since my car is in the body shop atm, but once i get it up and running can someone explain to me an effective way of adjusting the maps.

Or is it pretty much .1 change on some cells then re-write the tune and test it and watch logs and make more adjustments?

idk im just excited to get this car in perfect daily mode, i know this car has more potential. the stocksupermap is just a taste!

and additionally let me know iirc
10.1 leaner
10 stock
9.9 richer

i appreciate any suggestions!

 

[Spiced MSP]

Opposite...values higher than 10 are richer. Lower than 10 are lean

 

[Dr0]

ty for the quick reply (thumb)

 

[Installshield 2]

what does that '10' represent?

I'm just asking because in terms of a true AFR...the air number being higher is LEANER; lower is richer...as 14.7:1 is stoichiometric (equal amounts for complete burn)...17:1 is very lean, 12:1 and lower is very rich...but thats a generic assessment for gasoline engines, not these specific engines...and this is how most AFR gauges display the mixture...

Just seems weird that that piggy back would reverse that constant...an AFR, by definition, is the amount of AIR related to FUEL...more air (higher number) is leaner, less air (lower number) is richer...and the fuel amount remains constant at 1...I know its confusing, as the computer is adjusting the amount of fuel delivered, not the amount of air...but if that thing gives an arbitrary '10' as something fuel related...just seems weird, thats all...

 

[Spiced MSP]

with the ssafc, values of 10 reflect the stock tune. So to pull fuel from the stock tune, you gradually lower the value and to add fuel to the stock tune, you gradually increase the value. It's not the same as you would think with AFRs where lower is richer and higher is lean. Think of the value of 10 being the base. To lean out, pull from the base number. To make it more rich, add to the base number. If that makes since. The ssafc is a signal calibrator. 10 equals no change to the signal; ie: stock tune. Lowering the number lowers the signal and vice versa. Don't think of it in terms of AFR. Think of it in terms of signal output. I can post a screenshot of a map from the afc if you want so you can physically see what Im talking about.

edit: figured I would post them anyway..lol
here ya go:
In this pic, you see all values of 10 across the board since you don't need to adjust anything at idle.

As boost increases, the values decreases from 10(stock tune) to pull fuel since the stock tune is rich.

 

[BRIAN_MP5T]

The idea of a modifier is not uncommon on a piggy back system.

Tuning is always Trial and error.

You isolate the place you want to work on, observe what it is doing, modify the behavior then verify the result.

 

[Dr0]

yeah its a weird set up but i guess it really doesnt matter much if you datalog a few runs after your adjustments and adjust accordingly.

i take it 11-12 afr in boost is good since you always want to be a tad richer in boost to prevent detonation correct?

 

[BRIAN_MP5T]

The general rule is that adding or removing fuel will not make or loose power, It changes fuel economy and cylinder temperature, which reduces the chance for detonation.

Adding or removing timing advance is what changes the torque so... "The target AFR is different for each car"

A target of 11 is very safe unless you are on stock rods, then it is a good target.

I am running Silly Ignition and high boost, but I am also running lower compression pistons and a very efficient flowing turbo (and High Octane Fuel)

 

[Preferio]

Once I went forged, full exhaust, and maxxed out the GT25 at 16psi, the stock tune actually gave me pretty good AFRs.

I sold my V1 for a V2 so that I could datalog. Trying to do it without datalogging made it much more time consuming. It's all about trial and error. I've made adjustments that I thought were okay, but once I road tested it and watched my AFRs I knew it was too much- pull over, make more adjustments, drive. REPEAT!