Bullydog GT Gas - A/F Ratio Survey

[nurseryboy]

I'm curious to see if / how the new Bullydog Triple GT Gas tuner changed the A/F ratios for our cars. It sounds like our cars may be running on the rich side even after the tune, but I'd like to see if that's the case for everyone (or if there are any other trends we can find). If you have the new tuner, please post the following:

Year Engine TransmissionStock or Tune Level (+ any other adjusted settings like timing)Average A/F Ratio while full throttle

Mine is:

2008 3.5 CVTPremium tune, +1 timingAround 12.2 - 12.4

I don't know if other mods (like intake) could effect this or not as well, if so, my upgrades are in my sig.

[razah9]

http://www.youtube.com/watch?v=109JwkoOAJM

Well I love it. From top down, A/F, Throttle, Intake temp, Coolant temp.+1 Timing, Premium Tune. Think 70ish outside.

[nurseryboy]

http://www.youtube.com/watch?v=109JwkoOAJM

Well I love it. From top down, A/F, Throttle, Intake temp, Coolant temp.+1 Timing, Premium Tune. Think 70ish outside.

Great vid. From what I can tell from it:

2008 3.5 CVTPremium tune, +1 timingAround 10.7 - 10.8

[Dexion]

12.2-12.5 is optimal range for a stable A/F ratio. Normal is usually low 11's or high 10's.Technosquare said that pre-reflash a stock ECU reported 10.8 for its A/F ratio. Looks like this thing is the real deal!

We just need guys who can take advantage of the rev limiter removal to post their results now (ie: the 6-speed guys )

[BrianAdams03]

I've been getting on average 14.2 A/F so far. There is a way to modify the ratio btw but can't remember exactly what it was called in the setup. It comes on setting A and you can put it on B but I wouldn't recommend it. I had mine on B for 1/2 tank of gas and got 3+mpg worse and my A/F ratio was around 22!! on average. And saw it peak at 26 once.

2008 3.5 CVT+2 timing, Premium Tune14.2(I do have ingen intake too btw)

[rich2342]

BUMP for 1/4 mile times with the advance and premeium tune. or dyno 6m/t's..

mchedhi.. any results yet?

[nurseryboy]

12.2-12.5 is optimal range for a stable A/F ratio. Normal is usually low 11's or high 10's.Technosquare said that pre-reflash a stock ECU reported 10.8 for its A/F ratio. Looks like this thing is the real deal!

Nice!! So it looks like mine is in that "sweet spot". I'd like to see what everyone else is getting (that's why I started this thread) so we can have a better idea of what exactly Bullydog did.

I've been getting on average 14.2 A/F so far. There is a way to modify the ratio btw but can't remember exactly what it was called in the setup. It comes on setting A and you can put it on B but I wouldn't recommend it. I had mine on B for 1/2 tank of gas and got 3+mpg worse and my A/F ratio was around 22!! on average. And saw it peak at 26 once.

2008 3.5 CVT+2 timing, Premium Tune14.2(I do have ingen intake too btw)

Whoa! 26!! I don't know how lean our engines can take, but that seems really, really lean. But, you're getting around 14.2 at WOT?

[SHIFT_confucius]

08 2.5 6MTReg tune, +1, 6500rpmk&n intake...

Firstly, if you haven't tried it, drive your car around for awhile, then download back to stock. I did today before stopping at the dealer for maint and it validated my original impressions.

I also had time to drive out to the boonies and try some different readings. (Sorry if it's too much more than just A/F numbers)

outside temp 83f(*the driving steady 65mph tests were in 6th gear, mostly flat roads)

intake at idle 111fintake at steady 65mph 102fintake accelerating full to 85mph 95f

A/F at idle 14.6-14.7A/F at steady 65mph 14.3-14.7A/F accelerating full to 85mph 12.9

throttle at steady 65mph 20%throttle accelerating full to 85mph 83%

Had time\place to try one performance run (First and only try. Could certainly be improved with cooler day and launch practice to stop wheelspin...)

0-60 8.6sec1/8 10.5sec @ 67mph1/4 16.3sec @ 83mph

[grv575]

So, special functions -> wideband sensor setting (A or B) chooses which A/F ratio you want.

It seems A uses ideal A/F (safer for say turboed cars, and maybe for non-turboed, not too sure. maybe an expert can chime in) of 12.5 average A/F.

B seems to use the stoichiometric A/F ratio of 14.7. Supposedly, this is the optimal A/F ratio (theoretically enough oxygen to burn all the fuel).

B is definitely faster, but not sure if I would run it 24/7 (fear of melting pistons & engine knock).

[nurseryboy]

So, special functions -> wideband sensor setting (A or B) chooses which A/F ratio you want.

It seems A uses ideal A/F (safer for say turboed cars, and maybe for non-turboed, not too sure. maybe an expert can chime in) of 12.5 average A/F.

B seems to use the stoichiometric A/F ratio of 14.7. Supposedly, this is the optimal A/F ratio (theoretically enough oxygen to burn all the fuel).

B is definitely faster, but not sure if I would run it 24/7 (fear of melting pistons & engine knock).

Great find! Anyone else able to chime in and let us know if option B would be safe or not?

[dldjros69]

Great find! Anyone else able to chime in and let us know if option B would be safe or not?

I wouldnt run b at all. Especially if it burns that stoich blend. i read on wiki that it produces alot of heat and isnt always the best plan.

B is definitely faster, but not sure if I would run it 24/7 (fear of melting pistons & engine knock).

[BrianAdams03]

Whoa! 26!! I don't know how lean our engines can take, but that seems really, really lean. But, you're getting around 14.2 at WOT?

No, sorry, at WOT it's at 10.5 and I've seen it get to 10.1.

[razah9]

I get 10s too, avg is prob 14 something & when I let off the gasit climbs to 18ish.

[Dexion]

No, sorry, at WOT it's at 10.5 and I've seen it get to 10.1.

this is really what I was concerned about 10.5 is rich. Optimal tune for performance is 12.5 @ WOT. Guess its different for everyone

[razah9]

http://www.youtube.com/watch?v=RSVPgYHttko

[Zerep]

well im getting an average 14 to maybe it has to do with the intakealso it really hot down here2.5 cvt14ishpreformance tune +2 timing

[migs7585]

So this is a stupid question but idk s*** about this stuff. What does this thing actually do

[DReed86]

So this is a stupid question but idk s*** about this stuff. What does this thing actually do

Sorry guys can someone exlpain all of this A/f stuff Im assuming that it is increasing the amout of air into and gas intake??? But Im not sure...

[crayzitalian3]

the last time i selected B, I was averaging mid 20's and hit over 30 way to many times. That was the first and last time I will use it again

[wade001]

I'm pretty sure all this is doing is adding more fuel into the combustion chamber. which gives a bit more power. while this does give you more there are some drawbacks. you would notice your mpg go down a fair bit, and you will have more unburnt fuel going into the cats. this is bad because it burns up the cat and it wont last as long because it is overheated and the internals will melt away over time and cause a hallow cat. this can also result in a clogged exhaust and that can really damage your engine. Stoke (optimal air/fuel ratio) is 14.7:1, so a 12:1 or 10:1 is a lot of fuel compared to the same amount of air that you get. A/F ratio sensors are meant to range im estimating around 12:1 WOT but up to 20:1 when cruising in an attempt to increase mpg.