Wideband o2 Tuning

[Gregs99eclipse]

For those of you that have done wideband tuning what are your A/F #'s that you were shooting for? I'm sitting at around 11.5:1. Anyone talked to a crazy good DSM tuner like Sean Glaser or David Buschur?

 

[RocketBoy]

Haven't talked to either one of them. But 11.5:1 is pretty safe. I'm running my car (or was before i started the swap) at 12:1 and it ran great. Once you start to go leaner than that you begin to take risks without proper logging/management.

 

[TSi92]

I shoot for 12:1. 11:1 is a bit rich but safe.

 

[Redsand187]

12.5:1 is generally the good range for a DSM. But you must remember on the dyno you are running between .3-.5 points more rich then when you are actually on the street, thanks to the ram air effect. So tuning for around 12.0:1 on the dyno is good for getting your 12.5:1 ratio when you are actually moving.

 

[GalantVR41062]

well I would say run what your car likes if your on the dyno start rich and work your way leaner, I would say start at high 11s and work your way leaner to what you car likes for power or tune by traps at the 1/4 mile where it counts... I would say 11.0:1 for pump gas so the little varence in fuel does not destroy said motor..

Good luck

 

[Hal]

It has been shown that you can make MORE power with timing than you can with mixture.

Set the car up for 11:1, then adjust the timing for 22 - 24 degrees under full boost (3rd & 4th gear). Once you can do this, then lean it out (if you can).

If you don't have timing control, invest in it.

Hal

 

[Violater101]

So for a daily driver, 11:1 and pump gas(93 Octane here in Texas) ...and say 21-22 degrees of timing is typically okay. Yes, I know each car is different and by no means this is the law as every car is different, but as a rule of thumb. I'm just curious just how accurate are front O2's. I've always heard that you want to shoot for O2's around .92 on a 2g. I know the A/F ratio on the DSMLink is not that accurate, but more like a ballpark figure. I think when I hooked my car up to a wideband it was around .6 low (wideband showed 10.8 vs 10.2 per the dsmlink). So more importantly, typically .92 would be around what A/F ratio. I'm going to be investing in one of those $300 widebands real soon, but I was just curious in the mean time.

 

[RocketBoy]

Your stock oxygen sensor is not really good for anything specific. It can basically tell you rich, stoich, or lean. The voltage values vary so much depending on temperature that it is near impossible to nail down a certain a/f ratio using voltage.
If you're trying to tune your car you'd be much better off with an EGT and a logger.

 

[RocketBoy]

For more information on widebands and why stock o2's don't work, check out alamomotorsports FJO page. It won't give me a direct link to it, but scroll down the left side and it's under gauges.

http://www.alamomotorsports.com/products.html

 

[taylorspl]

Originally posted by Hal
It has been shown that you can make MORE power with timing than you can with mixture.

Set the car up for 11:1, then adjust the timing for 22 - 24 degrees under full boost (3rd & 4th gear). Once you can do this, then lean it out (if you can).

If you don't have timing control, invest in it.

Hal

By timing control do you mean an ITC or something like that?

 

[rdrkt]

Originally posted by taylorspl
By timing control do you mean an ITC or something like that?

Or a standalone ex. Haltech.

 

[Enigma_Man]

I've read that the most power from the air/gasoline mixture comes at a ratio of 12:1, and that the most efficient burning of the gasoline occurs at 14:1 (that's why our O2 sensors aim for that).

I don't have any real experience on what is powerful and safe or not, but 12:1 theoretically makes the most power.

-Jesse

 

[taylorspl]

12:1 read as safe power on pump gas.

 

[Gregs99eclipse]

Do you mean 12.0:1??? There are 10 points in 12:1 A/F ratio. specifly

 

[taylorspl]

Yes SORRY I FORGOT TO TYPE .0, also thanks for breaking down the decimal system I get confused sometimes. I really hope that the way I read your message wasn't the way it was intended when you typed it or you will find nobody wants to answer your questions or help you.

 

[Gregs99eclipse]

No, I'm very sorry if that's the way it came across. I should have re-read it. I guess I was just kinda frustrated because while tuning your car 11:1 does not help me ;-) again I'm sorry

 

[taylorspl]

It's okay its hard to tell tone from freaking words on a screen. I would say keep it 12.0:1 - 12.3:1 for safe power on pump but I don't trust the pump around here maybe some people go leaner. Also if you havent already check out the DIY Wideband Project, build your own wideband. Take it easy.