Ok so obviously this has been covered before, but i just wanted to know what everybody's thoughts are on this. Ok so everybody knows that we tend to get spool up knock often. My question is what do you guys set your timing to and what AFR do you aim for between 2500 ( original lean spool starting point) and 3500 (full boost or so in 3rd gear on a flat road in an evo8). I want to know what AFR' and timing you aim for between those rpm ranges?

Also might as well tell me your peak torque timing and timing up.

Actually Cali evo8 guys throw up a 3rd gear log please



SELF TUNING IS A PAIN IN THE ***

 

reason why im asking this is, because i disabled lean spool and now i want to set up my timing/ AFR durring spool up,

the most depressing part about it, either i am use to the power, or i think the amount of timing and the lean AFR i run, didnt add as much power as it should have.

also everybody aims for a solid 11:1 AFR ratio in cali right?

 

Timing hits 3 - 2* and AFR gradually goes from stoich to 12.2, both respectively from off throttle to WOT. Boost hits 30 psi in about a sec.

The most dangerous AFR at high load is 14.7, leaner or richer is safer so try it avoid being in that window for too long while starting to spool.

 

You sir have been reading some good literature! Thank you!

Anyone who reads this, please do not argue the above point, as it is true.

 

why is leaner than 14.7 safer than 14.7?

 

Because the O2 starts to dilute the mix slowing the burn. Think of it as a bell curve with stoich in the middle with lean and rich on each side, with most power slightly rich. An easy way to get better milage is with closed loop running lean of stoich. The leaning I assume will have to be with the BE enlean map since all my previous leaning attempts with the AFR map resulted in 14.7 at WB due to egr dilution (not really knowing how much fuel is really cut).

Why is the car set to run at 14.7? Because the catalytic converter works best there

14.7 is only bad under high load

 

lc aka c6,

14.7 is the mix ratio that gives the least "pollutants" too.

oddly a leaner burn gives off undesirable gases too.



better watch c6 on this subject it is interesting.

 

Sometimes the stuff you learn from unsuccessfully fixing something unrelated outweighs the problem itself. Sure wish I had a math background though.

Like coolguycooz wrote: "SELF TUNING IS A PAIN IN THE ***" but you can pick up things along the way if you remain modest.

 

dont throw so much timing @ the start, i usually keep my afr's around low/mid 12's for spool up (lean spool disable). maybe retard some timing @ lower load cells 2 for part throttle, since the ecu will take an average between the 2 once you nail it @ the start of the pull. you may c 100% throttle and timing a little higher then you "thought" you set it 2.

 

my wideband doesnt log AFR sorry but this was when I had the stock 16g with meth, boost around 30psi. currently now I have a self ported 20g I put together aka "20G_B" timing is alot lower now LOL. hope this helps

timing for 2500-3500 is about 3-6*, i will see if I can find a stock turbo log for ya if you want it. this pull isnt what you want probably (i normally start my logs @ 3k or 3500)

 

i couldnt find a 16 log but here is a 20g it was a HOTT day

 

So, that said.. If we dont have a converter at all should we be running a different AFR in closed loop for better closed loop power?

 

bnice01, that must be some amazing gas, what fuel was that log? what psi? Your load calc seems to jump around like crazy.

 

Keep in mind timing will be different between the 8 and 9.
The 9 does not need as much timing as the 8.

 

the pull wasnt a good pull cuz I hit it until 100% throttle until close to 4k so I got full boost later thats why my max load is later (4400) but you can see it fall after that good old 16g, i dont have any more 16g logs but I have 20g ones did a little cleaning. but i run a m15 nozzle 100%meth, boost around 30, afr for spool up is 11.9 tapering to 11.6 @ redline (same for the 20g as well). the powa of meth