Exhaust cutouts?
 

I did a search to see if any one had brought them up. Has any one tried putting electronic cutouts before the cats, plugging up your O2 sensor hole, putting your O2 sensors before the cut outs and then tuning?

Probably would be horrible for noise on the street and get you tickets in CA but for off road when with noise canceling head sets on...:rolleyes:

Let me know if some one knows any thing on the subject. Also, maybe wide band O2s?

ALSO: this would be behind a supercharger.

Thanks!

Something like this?
The Gotts O2 mod with pics - F150online Forums

Interesting. Thank you. Now how do you tune for that? Kinda seems like a mod for the untuned? Yeah? no?

It's for the rears only and can be done with or without tune.
Preferably if you are going to go catless you shoud tell the tuner.

Yeah, I will end up doing that for sure. I have tried calling PHP 300x and sent an email last night. My engine goes in this weekend so if I can't get a hold of them soon I am going to have to get tuning done some where else :( I know they have been crazy busy with unexpected issues so I am holding out as long as I can!

Unexpected issues led to being closed this week(out of office) and then next week is manditory monthly phone closure week. :shrug:
So I don't know what your turn around time needs to be?
Try to fax them? And see what kinda response you'll get?
If you are really in need of expidited tuning you can try VMP Tuning Inc. Justin uses SCT products like the Xcal3.
I don't want PHP to lose a customer but if you need tunes that fast that's who I'd recomend.

Yeah, VMP and Troyer both only do the SCT tuners. I am going to try and hold out as long as I can. I told her in the email that I really like that they are a family based company. My family as well as my self both own our own businesses so I know how speed bumps in life can play a tole on the business. A few years back my little sister was had to have 2 unexpected brain surgeries. You can only imagine what that did to there business. I haven't driven the truck in 3 months so whats a couple more weeks right? :cheesy smile:

Maybe this will help?
http://forum.gopowerhungry.com/lates...ss-3-15-a.html

That would be cool! Thanks for the heads up!

I am stuck on this again.. I am trying to figure out how to design the new exhaust so that I can have a tune with cats for on the road and a tune with out cats for off road.

My problem is where do I put the O2 sensors and do I do any thing to them?

It seems that if I have the cut outs before the cats that I should have the O2 sensors before them both right? If so, do I do that O2 sensor modification in the thread posted ^? :hmmm:

Give me a couple of days to think about what your asking?

Bypass maybe? If it would fit you could weld a bypass with a similar machenism to the throttle body. With that closed the exhaust will be forced to go through the cat and o2 sensor. When it is open the majority of the gas will take the bypass because of it having the least amount of resistance. You would probably have to have 2 different tunes though. One for when the plate is closed and another when it is open because the second one will have to not only take care of the better flow but also the lack of your o2 sensor's input to adjust A/F ratios. You could also set up the bypass like some chevy exhaust that has the two pipes welded to 2 plates and the plates are bolted together. Just stick a piece of flat metal next to the seal to keep the exhaust from taking the bypass. :shrug:

That is basically what I am going to try and do except my new question was what do I do with the O2 sensors. There will be 2 different tunes but you cant really tune one with O2 sensors and the other with out. Now what I am trying to figure out is if you relocate the O2 sensors before the exhaust cutouts will I need to modify the O2s or can I just leave them. 2 different exhaust set ups are not really a common thing for a tuner to have to tune for. At least 2 "quick" exhaust changes. Not just an "unbolt this one and put on a completely new one". I guess it really just depends on how sensitive the O2 sensors are and how effected they will be.

If he is making 2 different tunes, the first will be as if the truck had a regular exhaust system and the second would be if the truck was straight piped from the headers. If you straight pipe the exhaust the O2 sensor is going to go crazy anyway if you were to leave it in there. You could probably relocate the sensor to be after the bypass. Whenever you open or close the bypass you switch tunes.

Yes, you must have your O2 sensors before your cutouts. I would place them around 8-12'' before the cutouts to eliminate any false reading caused by the negative exhaust pulses. Do not use the anti-fouler's on them either, they need to be in direct exhaust flow to be accurate and responsive.

As for the rear O2's, I would just leave them alone, no anti-fouler's.

Then all you would need is a "no cat" program designed to ignore the rear sensors to eliminate and P0420 codes, and a "cat" program that will watch the sensors.

Should be no sweat for Bill to handle.

That is what I was hoping for. So it is doable to "turn off" the rear O2 sensors? Was not sure how that worked on the OBD2 systems. That would be amazing! The power...the sound :drool2:

Yeah buddy.........sounds like a cool project!

Regardless of what tuner you go with can you let us know how everything works out?

I am going with PHP. I have gotten to much help off of these forums to go with some one else. Also, I am just feelin the family owned and operated business thing. Usually they give you the better service and take the time to make sure things are done properly.

But for sure I will keep you updated. I will post some videos as soon as I get it done.

The family business feeling kinda grows on you doesn't it? It's like a disease that you WANT to spread. :giggle:



It'll sound goooood. :2thumbs:

Ok, I just ordered the dual 3" exhaust cut outs. I got them with out the remote openers for now just to make sure every thing works as planned. If I like them and all goes correctly I will get remote openers so when I turn off the truck to set it to the "offroad" tune I can open the cut outs at the same time with out leaving the privacy of my own truck :cheesy smile:

Hey wow! ^ my sig finally decided to show up :shrug:

Holy hell! That looks bada**!

That would be fun as hell in Glamis!

I miss that place, especially around Thanksgiving or New Years!:whistle1:

Thanks! Yeah, I have never been out there. We have our own dunes here in Pismo but dunes just aren't enough for the truck lol. Makes 17" of front wheel travel and is still 4X4. The rear end has 3.0 tripple bypass shocks waiting here ready to go in when I get the new rear end. The rear of the truck will make 19" with a spring under set up. When I get bored of it and the truck isn't so new I will link the rear end and probably redesign the front end. For now it is more then enough though.

Very nice!

That is one think I have always wanted to do, build a pre-runner style truck.

Someday. :rolleyes:

Yeah, it is one of those things I never thought I would ever do lol. I have always been into racing and drifting. I bought the truck brand new, drove it for a few hundred miles and then got bored.... Now I have a prerunner :doh:

Where are you getting the remote opener things? I've been looking for them and haven't found any yet. I knew someone who could get them but I dont have contact with them anymore. :doh:

That is a pretty sweet truck...that reminds me, I need to put my sig back up. :giggle: I've been wanting to build my own but from the ground up. Planning on a go cart/sand rail design because EVERYTHING would be way cheaper. I can also make it fit on a trailer instead of the hassel of making it street legal.

You can find them at Jegs or Summit racing. If you do a search for "exhaust cutouts" you will find hundreds :cool:

So sad day kinda. I talked to Corey earlier on the phone and she was not sure if Bill would tune the truck because of the supercharger. I guess they are really finicky and it is easy to blow up the engine. I kinda knew that, that was the reason for custom tuning :D but he is suppose to give me a call tomorrow and discuss if we can do it or not. Now, if he can not is there any other suggestions on tuners? I know Troyer is a good one. I really wanted to use my edge but if I go with any one else I am going to have to buy a SCT :matt-roloff:

I put a Rousch kit on a customers truck a while back and they had me send the PCM back to have it re-flashed. Truck ran great, but I felt like there was more left in it.

I also know a guy who had the same kit but used a different company to program it, and was suppose to be bad a**, I will find out later who it was.

Thank you.

I just gave stage3 motorsports a call to see if they could do any thing for me because I basically have there "nightmare upgrade package".

2004-08 F-150 Roush Supercharger Upgrade Kit - Free Shipping

He is going to give me a call back tomorrow also and let me know if they can do it. I hope I do not have to put this thing on a trailer and pull it 500 miles to be tuned... cool thing is I could drive it home :giggle:

Thanks UNITY. I've been looking for those for months but never got the correct terms to find them.
"exhaust cutout" why didn't I think of that? :doh: :giggle:


Something tells me we'd get along just fine. I'll put up a mod list eventually because when I get bored I start making mods...just not as expensive as yours. :hehe:


You could still sport the totaly awesome PHP stickers that are good for about 20 horsepower. ;)

Yeah, that is why I usually leave the stickers on the new tires too. I heard that the adhesive from them actually works like a racing slick :cheesy smile: 20hp to the horn!

Geeez Guyz!
PHP stickers are worth 35hp!
Roush does leave some hp on the table!
You can thank the EPA and CARB/CART for that.
Troyer is probably the best out there for S/C apps if Bill doesn't want to touch it.

Peace!:)

Yeah, Troyer is still states away though haha If bill does not want to touch it I may just go with the Stage3 motorsports for now and then order custom tunes from Troyer so that way they can take there time. I have heard people say that I should plan on about 7 weeks! I am all for having patients but if $300 is the difference between driving the truck now or 7 weeks later I will go a head and spend the $300.

It's your call!
:shrug:

Ok, Ive decided if Bill can not do it I am going to just go with a dyno tune down south at a shop who seems to be pretty reputable in the mustang world. Racers Edge Tuning :: Southern California's Finest Mustang Shop
I talked with Greg the owner today and he said that there should be no problem. There is a flat rate fee of $500 for the dyno tune session but at least I will know the truck is done correctly. Cool thing is that I will be able to film it and post some thing for every one to watch.

Now, kind of off subject from this thread (but most of this has been :D ) but is there any thing I should look for or keep in mind or just any advise for this tune session? It will not be for a few more weeks so I have some time to make sure that I am prepped. Just want to make sure every thing is done correctly.

Just bring an open mind to his shop and leave any attitudes at home.
Good communication of what you want your truck to do is the key.
If they offer it make sure to get a copy of the file.

Perfect. Thank you! It should be in about 2-3 weeks is my guess. I will let you guys know when it happens.

The exhaust cutouts arrived today while I was in LA paying for my new GMR custom 9" full floater rear axle. I decided to go with a 35 spline in stead of a 40 because I wanted to run a Detroit locker rather then a spool. I also went with 5.13 gears to keep me in the game :cool: Full 3.5" chromoly housing with race truss, Wilwood brakes, hubs etc. I can't wait! Should be done in just a couple weeks.

http://ep.yimg.com/ca/I/yhst-9416767..._2090_16645019

Bad A**! That thing is gonna be fun. :2thumbs: