H4Inf

Just wondering if I need an O2 sensor wired up - or if I do not have an O2 sensor, should I ground this wire?

I noticed that with no sensor connected and the wire not grounded, the o2 sensor readings can be erratic and it does seem to affect the tune.

Also does MAT (ait temp) affect the tuning or can this be disabled... I haven't got an air temp sensor wired up yet..

I have the car wired up and driveable, just making sure I am fully prepared for the dyno

I'm using the MS2 chip and just running the standard firmware, not the ms-extra as i dont think it is stable yet.. I'm running a 6port 13b. One thing I notice with my base tune is that when i go from primaries to secondaries the car really doesnt like it, im betting i need to richen this up here... the way the intake is setup is that i have bank1 injectors injecting into the primary intake, and bank2 into the secondary intake... my thinking is that it is a waste of fuel pumping fuel into the secondary ducts when there is no airflow there, so thought i would configure a table per injector bank... is there a better way to do what im trying to do?

Thanks,

Paul.

muythaibxr

Just set the O2 step % to 0, then O2 will stop affecting your tune.

You should connect an air temperature sensor, as that affects the tune a great deal... and set up correctly could keep you from needing to retune due to changes in ambient temperature.

If you are using an MS2 with standard firmware, you're using the dual-table code?

Tuning in that manner can be difficult... and it's hard to tell what the problem is on that transition without having some form of O2 sensing hooked up... it could be going lean, or it could be going too rich and bogging.

There are several ways to do staged injection, but if you're spraying into stagnant air, that will definitely cause a lean spike.

You may want to bring on the secondaries based on MAP AND rpm if using the dual-table code instead of just using one or the other...

Tuning a single table with the staged injection code in ms2/extra will be significantly easier though.

Ken

H4Inf

Thanks Ken. I am relatively new to the tuning process, and I thought maybe I should stick to the default firmware rather than the ms2/extra - although I understand the ms2/extra is much more suitable for rotaries as you can set a TPS point where the secondary injectors start firing, correct?

Would you recommend I upgrade to the ms2/extra firmware? (I am only running fuel - ignition is run from the dizzy at this point)

Cheers,

Paul.

muythaibxr

The ms2/extra firmware is still in alpha. I'm not going to recommend that you upgrade due to that. It is mostly undocumented, and different from the standard ms2 code in many places.

Running fuel only shouldn't hurt anything though, and I want to get more EAE testers.

Ken

thegoatc

sorry for the dumb question but what is EAE?

muythaibxr

"Enhanced Accel Enrichment"

It's a wall-wetting-based algorithm for accel enrichment. I've been able to tune the Corolla GTS with a 20v 4age with ITBs on this algorithm when it was difficult to get it perfect using any other algorithm. I'm talking the AFR stays almost perfect with very very very small fluctuations during normal driving, and when I blip the throttle to rev-match for a downshift, the lean-spike is only a couple of datapoints long, and 1 AFR point or less... and best of all, the engine responds almost instantly.

The math is similar to Al's X-tau algorithm in the standard firmware, but much easier to tune (I personally couldn't get x-tau to do anything useful with the ITBs).