Future upgrades questions.

[Jaxstang]

I never did much for my cars in the past so I don't know much about it.

If I understand it correctly, I can add a CAI and cat back exhaust without needing a tune. I don't want to put a tune in the car so this is important. What about putting a full exhaust (including headers ) and a CAI? Is that stil ok without a tune?

My second question is somewhat related. I read somewhere the ideal AFR is 14:6. I notice my car idles at 14:0 - 1 and when driving it goes below that so it seems to be running a bit rich. Will adding the CAI and exhaust make the car run closer to 14:6 or no difference?

Thanks for the info. I'm not making changes yet just gathering info first and waiting a bit for other options including Roush since my dealer is a Roush dealer as well. :clap2:

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[SVTFreak]

You can do headers and full exhaust as long as you leave cats and all O2 sensors.

Ideal are is 14.7 on 100% gas (ethanol changes but don't recall off my head) but that's not what's best for the motor. Especially at wide open. 14.0 is slightly rich. But not enough to make a difference. And actually, on 10% ethanol, that might be ideal mix (I don't feel like looking it up, sorry lol). The moral is, don't worry about afr. Especially stock. Find a different screen to toy with. Afr isn't something that needs constant monitoring.

 

[Tele5.0]

Some CAI's require a tune, some don't. Just make sure you pick what you want.

As for upgrading the entire exhaust system and CAI, If it was me, i would get a tune regardless so that you can take full advantage of your upgrades. Just my .02 though.

 

[Ryudo83]

Some CAI's require a tune, some don't. Just make sure you pick what you want.

As for upgrading the entire exhaust system and CAI, If it was me, i would get a tune regardless so that you can take full advantage of your upgrades. Just my .02 though.

agreed. If you dont want to put a tune on the car but are interested in parts that either could "require" a tune or would see the full potential with a tune, then ultimately you would be wasting money. If its sound ur after a cat-back or axle back should suffice.

 

[Grimace427]

If you don't want a tune skip the CAI. If you want headers, you pretty much need a tune to not only eliminate the check engine light but also to remove cat overtemp protection and a few other things that would prevent the engine from running optimally.

Optimum a/f ratio depends on a lot of factors. For a long time, the "ideal ratio", aka stoichiometric ratio, was 14.7:1 which means 14.7 parts air to one part fuel. For the 2011 model year Ford changed the ECU stoich programming to 14.079 to account for the increasing ethanol content in pump gas.

At idle and cruise you will often see 14:1+ a/f ratios because the engine is not demanding as much fuel. During WOT acceleration the ratio will drop to as low as 11.5-12:1 which means more fuel is being injected into the engine. The lower the number, the more 'rich' the ratio is. The higher the number(like at idle and cruise), the more 'lean' the ratio is.

 

[Grimace427]

You can do headers and full exhaust as long as you leave cats and all O2 sensors.

Ideal are is 14.7 on 100% gas (ethanol changes but don't recall off my head) but that's not what's best for the motor. Especially at wide open. 14.0 is slightly rich. But not enough to make a difference. And actually, on 10% ethanol, that might be ideal mix (I don't feel like looking it up, sorry lol). The moral is, don't worry about afr. Especially stock. Find a different screen to toy with. Afr isn't something that needs constant monitoring.

At WOT a 14:1 ratio is extremely lean and could lead to potential engine damage.

I agree with your second point though. Unless you are tuning, the stock air/fuel ratio is not important.

 

[BoomBoy]

If you don't want tune, I would skip CAI and just add a catback.

 

[Jaxstang]

Thanks guys for the quick replies. Makes sense now that things are more explained. I guess I will be looking at a cat back only when I go for an upgrade in a month or two. I might add one of the CAI that do not require tune just to help the car breathe better. I am not interested in huge HP gains because for my type of DD it would be a waste. I just want better sound, slight MPG increase if possible, and a better breathing car. The rest of the mods will be appearance, lights (already got some from Diode Dynamics), and sound when decent replacement speakers are available.

 

[TeddysStang]

Thanks guys for the quick replies. Makes sense now that things are more explained. I guess I will be looking at a cat back only when I go for an upgrade in a month or two. I might add one of the CAI that do not require tune just to help the car breathe better. I am not interested in huge HP gains because for my type of DD it would be a waste. I just want better sound, slight MPG increase if possible, and a better breathing car. The rest of the mods will be appearance, lights (already got some from Diode Dynamics), and sound when decent replacement speakers are available.

Yeah, I thought about doing a CAI as well and didn't want a tune but since this isn't my DD, I probably will just get a Roush axleback exhaust and maybe a K&N filter. I also got the Diode Dynamics LED lighting for the interior lights and trunk.

 

[Diode Dynamics]

Thanks for the support @Jaxstang

Congrats on the new 2015 Mustang GT!

Nick C.

 

[[email protected]]

I wanted to go aftermarket exhaust when the service manager at scarsdale ford told me car will not pass emmisions in ny due to o2 sensors not getting hot enough,he said you must put factory exhaust back on to pass inspection.Still recearching

 

[Grimace427]

I wanted to go aftermarket exhaust when the service manager at scarsdale ford told me car will not pass emmisions in ny due to o2 sensors not getting hot enough,he said you must put factory exhaust back on to pass inspection.Still recearching

Anything after the catalytic converters has zero effect on emissions. This means catbacks and axleback exhausts. Only cat-deletes or headers would affect emissions.

 

[[email protected]]

he is telling me that the o2 sensors will not heat up enough due to less back pressure from modded exhaust,I am still looking into this as others have told me the same

 

[obk787]

he is telling me that the o2 sensors will not heat up enough due to less back pressure from modded exhaust,I am still looking into this as others have told me the same

He is 100% wrong. If that was the case you would have a check engine light on all the time because the O2 sensors arent communicating with the ecu.

Back to the main thread. May I ask why you dont want to do a tune? Is it because you are afraid it will void ur warranty? If thats the case then many dealerships will void ur warranty for simple thing such as catback and they will 100% void ur warranty for headers.

 

[Fomoco15]

[ame="[MEDIA=youtube]id=DGh8jDlEEG8;list=UUybGghyc0ShFVb0SXhYnAQA[/MEDIA]"] This is going to be my first mod. Best sounding to me so far!

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