Exhaust

[Tommy V]

Well theirs a member on here that lost about12 hp with the sw catback, rev auto took it off and with the car back on the dyno it gained horsepower back and more, someone explain that one to me, and the dyno and notes are in the thread in case my numbers are a little off.

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[USPSALIMITED]

Well theirs a member on here that lost about12 hp with the sw catback, rev auto took it off and with the car back on the dyno it gained horsepower back and more, someone explain that one to me, and the dyno and notes are in the thread in case my numbers are a little off.

For reference, http://www.mustang6g.com/forums/showthread.php/stainless-works-2015-5329p21.html

A wild guess would be that with the other modifications in place (headers, high flow cats, tune, cai ?, etc.) , the catback restriction becomes significant.

I'd really like to know all of what the timing & fuel air ratio control was doing during the runs also. Perhaps the computer controlled variables are always about equally optimized regardless of what tweaks you throw at the system, and perhaps all of the sensors are accurate regardless of the things the users changed. I would just like to know for sure.
I don't always trust computers .

 

[Tommy V]

For reference, http://www.mustang6g.com/forums/showthread.php/stainless-works-2015-5329p21.html

A wild guess would be that with the other modifications in place (headers, high flow cats, tune, cai ?, etc.) , the catback restriction becomes significant.

I'd really like to know all of what the timing & fuel air ratio control was doing during the runs also. Perhaps the computer controlled variables are always about equally optimized regardless of what tweaks you throw at the system, and perhaps all of the sensors are accurate regardless of the things the users changed. I would just like to know for sure.
I don't always trust computers .

Agreed I would love to see what the long and short term fuem trims and timiming was, the only 02's sensors that control all of those things are up stream, which leads me to my next question does the 2015 only have one 02 sensor per side since its sits right off the header.If it had 2 o2 sensors per side then taking the catback off should have not affected the air/fuel, just mayback the cat o2.

 

[beefcake]

again, comparing a dyno of no catback / open headers, to a dyno of a street car with catback isn't a good comparison

comparing the stock catback vs an aftermarket catback is what you should do. and again, a minimum of 2 runs each way

 

[USPSALIMITED]

comparing the stock catback vs an aftermarket catback is what you should do. and again, a minimum of 2 runs each way

Agreed, it would be very helpful if the aftermarket suppliers would do this.

 

[beefcake]

most exhaust manufacturers don't have dyno's, not so much the headers, but catbacks don't pick up much power, they are more for sound

 

[Tommy V]

Well then the 3 put tbeir with their 25 to 30 hp gains will have alot of explaining to do if that is true.And its not like these are joe smo exhaust companies, im going to wait and see what pans out.What gets me is comparing the the 2015 to the 2014, after hearders completely different exhaust.Different size pipe, no body knows anthing about that suitcase.So things are going toncome out soon, I never believed tthe 30 hp gain from jump but those saying 5 hp we'll see and hopefully soon.

 

[matholland618]

What does everyone think about Mac's Cat delete? I am tempted on buying it.

 

[beefcake]

What does everyone think about Mac's Cat delete? I am tempted on buying it.

I'm not a fan of "hacking" a 30-45k car personally.

but it is a less expensive option if you want something cheaper.

 

[matholland618]

Does anyone know about the quality of them? I really hate to drop 1,200 bones on headers, just to eliminate cat's so that I can get the lope tune. I've got a welder, torch...etc, and the way Mac talked is its a real straight up install.

The downfall is that it is not easily returned back to stock. It would basically have to be left alone when traded in and left tuned, programmer pulled, then paid to be unlocked, or just leave the programmer in it and trade it in...Or possibly just keep the cat and work out something with the dealer saying here ya go, here is the cat...Take my exhaust off and I will take the car if I get my old one back...Just a thought, that is the only thing that I don't like about cutting the old cat off.

Beef, I know we talked about this a bit on the phone. I have to say, that doesn't bother me too bad. Mainly because there are a lot of small exhaust shops around that make every bit of the exhaust. If I ever got into a bind, I know 1 here in town real well and they would be able to help me out. (Their shop used to be at my neighbors house and had a shop out back).

 

[beefcake]

Does anyone know about the quality of them? I really hate to drop 1,200 bones on headers, just to eliminate cat's so that I can get the lope tune. I've got a welder, torch...etc, and the way Mac talked is its a real straight up install.

The downfall is that it is not easily returned back to stock. It would basically have to be left alone when traded in and left tuned, programmer pulled, then paid to be unlocked, or just leave the programmer in it and trade it in...Or possibly just keep the cat and work out something with the dealer saying here ya go, here is the cat...Take my exhaust off and I will take the car if I get my old one back...Just a thought, that is the only thing that I don't like about cutting the old cat off.

Beef, I know we talked about this a bit on the phone. I have to say, that doesn't bother me too bad. Mainly because there are a lot of small exhaust shops around that make every bit of the exhaust. If I ever got into a bind, I know 1 here in town real well and they would be able to help me out. (Their shop used to be at my neighbors house and had a shop out back).

that's the biggest thing, not easily returned to stock. for a lot, that's a big deal.

 

[matholland618]

that's the biggest thing, not easily returned to stock. for a lot, that's a big deal.

The way I kind of looked at it, was header's seem like a pain, but it is a bolt on. I don't know how eliminating the cat would do for warranty work on the motor itself since in order for it to run right, you've got to have a custom tune. It has been since 2011 since I researched all of this. How is ford on warranty when a programmer is involved? Can they still tell if there has been a programmer on it, or are there tricks around it and such?

I've not made my mind up either way...Just brainstorming at this point and seeing what the options are.

 

[Tommy V]

Some say the tunes can be detected and some say they cant, do u want to roll the dice a d what kind of relationship do u have with ur dealer.U can get high flow cats as well.

 

[1320']

Some say the tunes can be detected and some say they cant, do u want to roll the dice a d what kind of relationship do u have with ur dealer.U can get high flow cats as well.

From a SVC writer friend of mine who works in a Ford service dept..

They cannot tell exactly "what" it was, but they can tell the ECU has been reflashed. Each time it's flashed it leaves a counter, be it from Stock to tune or tune to stock.

 

[beefcake]

its a key cycle basically

you flash, and take it in with 10 key cycles, it's obvious

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