Ignition timing and afr tuning - developments

[Trakx 0]

Anyone outhere tuning the g60?

 

what afr to target?

 

What boost / ignition are you using?

 

I'm running a g60 turbo. Stock head with 268 symmetric cam. The turbo is a Garrett GT28R.

Trying to run 1.2 bar.

AFR is 11.8 to 12.2 and ignition is 14.7 degrees total advance at 4500 and 15.5 at 6500 rpm.

 

Comments?

[Trakx 0]

Anyone tunning the g60 ?

[Trakx 0]

NO ONE??

[dirtytorque 0]

are you using a wideband?

What fuel managment system are you using then mate?

When I do my g60 on megasquirt I will just be trying to establish LBT with the most advance that I can get away with without any discernible knock.

Are you tuning on a dyno?

I think I have a ignition advance table for a g60 somewhere that maybe you can use as a ballpark guide?!?!!?

[Trakx 0]

I'm using a LC-1 wideband and the stock digifant engine management.

I've also have a knocklink to monitor knock.

I do have the stock g60 ignition table.

[Trakx 0]

so .. developments

 

couldn't use 14.7 at 4500, always had a dip in afr which i couldn't get rid off by leaning out. This dip was caused by the ecu pulling timing. So reduced ign to 12.25 at 4500 rpm and increased fuel and no more dip.

(ecu pulls timing at 3 degrees at a time)

 

Has for ign at 6500 rpm it's now at 13.8. My previous value was 15.5 which was ok pulling a 3rd and 4rd but tried 5 gear to redline and it started pinging.

Engine temps were ok. water - 85

[Kevin Bacon 5]

I would invest in an EGT (Exhaust gas temp) gauge. It will tell you far quicker than knock sensors if you're pinking.

 

Try some Tesco 99 Octane if you're UK based, or Shell V power, which will help a bit.

[Trakx 0]

i think you're right. i should get an egt. the reason i didn

[dirtytorque 0]

i think you're right. i should get an egt. the reason i didn

[Kevin Bacon 5]

Correct /\

 

The normal EGT temperatures on cruise, idle, full throttle won't be known in advance for your engine.

What you're looking for is consistency, give or take 50 degrees here and there.

 

As dirty says, if you floor the boost and the EGTs suddenly drop from say a normal, 800 deg C, to say, 600 deg, then that indicates a rapid reduction in flame temperature - e.g. pinking!

 

It happens so quick with EGT, so is a really good visual warning.

 

IMO it's a must have gauge for turbo engines.

 

It's also a good tuning tool too because if you're cruising on part throttle at a steady pace and the EGTs slowly climb, you know you're running too rich, and / or too little timing ;-)