Exhaust Pops and A Failed Race

[KUgrad13]

Question for you guys with the Cobb accessport, how do you switch to the different modes? I just installed mine and can not figure it out.

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[DanFish]

I don't have mine yet but I think it's cruise control cancel and then you use the up and down arrows.

 

[KUgrad13]

I don't have mine yet but I think it's cruise control cancel and then you use the up and down arrows.

Thanks, I will try this on my way home from work. I have mine mounted to the dash to keep it plugged in at all times. When I do what you said above will it show me on the screen what mode I am switching to?

 

[DanFish]

From what I understand yes it should. Watch this video of the focus at and it should give you an idea.

 

[wireless]

While your cruise is off... press the "cancel" steering wheel button.

You can then use the "SET+ and SET-" buttons to scroll down.
1 is the high performance
2 is med/high
3 is med
4 is low
5 is economy

 

[5TAR5CR3AM]

It takes some technique to get the revs and boost up without spinning.

Wait... without spinning tires? I have a manual. I'd roast my clutch lol. I can't do what you are doing.

 

[stormtrooper]

Ive actually seen mine spike to 44. It showed it on the AP. My cousin was holding the accessport and he was like it just went to 44. I was like no way. And sure enough it showed a top reading of 44.

 

[DanFish]

So that means that it was very lean? Could that spike cause problems?

 

[5TAR5CR3AM]

Mine does that too between slow shifts and engine braking. I don't think its actually hitting 44:1 but it's just a number that the accessport defaults too. Maybe Cobb or one of the other tuners can chime in.

If it's doing that while under throttle or boost... well that's not good.

 

[mizer67]

So that means that it was very lean? Could that spike cause problems?

I'd like to see Cobb or another tuner chime in.

Running too lean can be harmful to an engine, just as running too rich is not desirable either.

Too rich, you burn more fuel yet don't generate good power and have unburnt fuel possibly causing issues, but a little rich usually has a cooling effect. Generally, running rich is less serious than running lean.

Too lean, the engine operates too hot and in extreme cases, a lean condition can cause detonation, usually cracking expensive stuff like sleeves and blocks. You can lean out an engine and make more power with a good tune, up to a point, but if you cross the line you start to degrade reliability or cause major issues. Older 2-stroke engines could actually sieze from running too lean.

However, I'm not qualified to articulate the effect of spikes like this on the operation and reliability of a 2.3L turbo automotive engine.

 

[5TAR5CR3AM]

I'd like to see Cobb or another tuner chime in.

Running too lean can be harmful to an engine, just as running too rich is not desirable either.

Too rich, you burn more fuel yet don't generate good power and have unburnt fuel possibly causing issues, but a little rich usually has a cooling effect. Generally, running rich is less serious than running lean.

Too lean, the engine operates too hot and in extreme cases, a lean condition can cause detonation, usually cracking expensive stuff like sleeves and blocks. You can lean out an engine and make more power with a good tune, up to a point, but if you cross the line you start to degrade reliability or cause major issues. Older 2-stroke engines could actually sieze from running too lean.

However, I'm not qualified to articulate the effect of spikes like this on the operation and reliability of a 2.3L turbo automotive engine.

While you are right, these lean spikes are happening between shifts and off throttle. What you are talking about is going to lean under throttle and boost. It's two completely different situations.

 

[mbreinin]

There is no way you are seeing a 44:1 AFR under power. You would have melted it down to an ingot by now, LOL.

It is very common OEM practice to pull the fuel out under light load conditions, like decel. It does no harm.

Mike

 

[stormtrooper]

It only spike when braking hard that ive seen.

 

[COBB Tuning]

There is no way you are seeing a 44:1 AFR under power. You would have melted it down to an ingot by now, LOL.

It is very common OEM practice to pull the fuel out under light load conditions, like decel. It does no harm.

Mike

Correct, this is the DFSO (decel fuel shutoff) occurring to save you from wasting fuel. You'll see this occur during tip-out, and lift foot shifting. Under normal operation you will not see AFR spike that high.

Cheers,
-Braden @ COBB

 

[DanFish]

COBB no more goodies or sneak peeks for us?

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