AFRs

[pormgb]

Hi All,

I'm doing some tuning before the winter comes and I'm trying to get a handle on ideal AFRs. Since the temperature has dropped I'm experiencing some popping and hesitation when I go hard on the gas under 3K RPM, I've done a RAFIG + Calc VET. Her are some images of my AFRs, does this look normal?

Motor specs;
LS6 Block
Camshaft 226/229 .575/.578 116 LSA
LS6 Intake
85mm Professional Products Throttle Body
Hooker Headers
No Cats
Denso Iridium plugs gaped at 40

[5.7ute]

Post your tune there is something majorly wrong there.
You do not appear to have commanded a rich enough AFR at high map (judging by a ben of 1.00 where 14.7 is the actual AFR)

[pormgb]

Post your tune there is something majorly wrong there.
You do not appear to have commanded a rich enough AFR at high map (judging by a ben of 1.00 where 14.7 is the actual AFR)

OK, I've attached my tune.

I've also been chasing some knock retard around 4k, I suspected i was running a bit lean.

Thanks!!

[Gregs]

wow ve table needs some help! why do you have the ve table jumping up like that after 4000 rpm?

[pormgb]

wow ve table needs some help! why do you have the ve table jumping up like that after 4000 rpm?

This is the VE table I've had for a while, I've done multiple Calc VETs so I suspected the table was OK.

[pormgb]

Update,

I just went through the below thread an I think I know whats going on;

http://forum.efilive.com/showthread....ighlight=b3618

I have been following the Calc VET tutorial including additional tips, I had B0120,B3618,B3605,B4205 setup incorrectly. I have returned those settings to stock and will test the car tomorrow, here is what I now have.

[Tre-Cool]

that last tune you posted wouldnt help you in tuning the ve table as it would be in closed loop.

try this one.
OS12212156.tun

[pormgb]

that last tune you posted wouldnt help you in tuning the ve table as it would be in closed loop.

try this one.
OS12212156.tun

Ok, I took a look, can you explain the changes. Does this tune disable O2 sensors and use only MAF+VE?

Installed the new tune, car will idle but almost stall when revs try to return to normal, I need to readjust my idle parameters. Idle AFR reads around 13.9 to 14 when cold, Is this OK?

[n8dogg]

B3618 PE based on RPM, shows AFR set at 17.03? Very lean here, for 100% gas 12.5-12.7 would be ideal. The main VE does not look that bad, could use some more smoothing but in the WOT areas it shouldn't matter much.

[pormgb]

B3618 PE based on RPM, shows AFR set at 17.03? Very lean here, for 100% gas 12.5-12.7 would be ideal. The main VE does not look that bad, could use some more smoothing but in the WOT areas it shouldn't matter much.

I'm now running the then provided by Tre-Cool, it addresses B3618.