Hi. just installed gsc s3, after a drive, when its idling, AFR is most of the timeon 14.5-15.2, but sometimes it rocks from 11.5-19.0, and knocksum is allways 0.
ive raised the idle, made it a little richer, and advanced timing a little bit, nothing seems to work here
any suggestions what to adjust in ecuflash ?
im looking for steady AFR and the rumble sound

 

How did you make it richer? Are you idling in open loop?

What does the rpm do when the AFR swings rich or lean?

 

You may want to disable closed loop, add some fuel and timing and rise your idle at least to 1krpm in the idle tables and adjust you BISS screw. You may use that example settings.

As for me, my car idles in closed loop at 1K, shooting for 14.7, but swinging sometimes maximum from 14.5 to 15.5. But I have less agressive cams (272).

 

^^^^^ agree.. turn your car in open loop at low rpms, and then let us know.

 

i will try these settings. and let you guys know. thanks for the help

 

let us know guy!

 

hi, i tried it out, but timing at idle is 7, now the afr is steady 14.6-15.3, and it rocks sometimes down to 11.5, but i think that is all right

now its time to tune some WOT !

 

Try 12 or so degrees of timing at idle.

 

thanks. i will try that. but i loose the rumble ? hehe i love that aftermarket camshaft sound
i´ll make some video for you also

 

Yes it will smooth out the rumble a bit. I would just try it as a test first to see if it stabilizes your AFR.

 

defenently.. When you tune WOT, do you add timing until you get knock and then back out a little, in what order do you tune WOT ?
afr>timing>afr ?

 

You may go that way on a limited octane fuel such as pump gas up to ron98 (93octane).

On e85, alcohol, methanol, racing fuels like c16, q16 etc. you can go add so much timing without any signs of knock that you will go past mbt - stress the engine and start loosing power.

 

thanks, im running 98oct. ron 98
what afr do you recommend?
12.5-12 during spool up,11.7-11.5 during peak boost and taper off at 11-10.9:1 at cutoff ?

 

Yes something like that as a starting point.

I usually hold a relatively stable 11.8-11.3 after peak torque, depending on setup and do not taper it much if temperatures allow. 12.8-12 during spool and part-throttle mid-boost (~8-17psi) tapering with rpm, 14.7-13 at lower boost (~0-8 psi) tapering with rpm about 0.5-0.8 point, 15.5 during cruise (2-4krpm up to 0psi) .

More carefull choice of AFR depends on your setup, boost, application and generally what does your engine like best )

 

here it is at idle, afr 15,5-17, timing 7 and 900rpm

here are two videos before camshafts


aaannnd one here

www.youtube.com/watch?v=DdIRFnAFm4M