stacks
 

im putting 7" stacks on my powerstroke. i want the miter cut stacks. i wanted to know how they are after a rainy day or night, i have a white truck and was wondering if after rain and i started it and drove it if my truck would have spots of black soot all over it??

Yep you will have soot all over... Drill a small hole in the bottom of the stack where the water can exit but you will still have soot spots on your truck...

how bad is it can anyone post some close up pictures?

its not that bad unless you have alot of power and blow alot of black smoke, the only time mine got covered in soot was after i washed it so i let it run as i washed it, i never got soot after it rained but you could do like said above and drill a hole or two at the bottom to let the water drain out, you could go with flat tops and put tractor flaps on it?

Does bigger stacks make a performance difference

nope. but anything less than 4" could decrease performance.

Stacks def. help with power, egt's, and mpg's over the stock exhaust... stacks are also really loud and sound good on 7.3's

Really, You got better mpgs and more power with just an exhaust? Must have been a Banks kit...:w2:

i know people who have had lower EGTs with stock straight piped exhaust. you don't put exhaust on planing on getting better MPG, if you do you will be very disappointed. the stacks sound good from the outside but get very annoying in the cab. i cant wait to remove my stack.

i had a single bull hauler going straight back on my 94 and you couldn't hear it in the cab. but when it's a foot above the cab i guess you won't.

some guys just put plastic coffee cans over the tips to keep the rain out.

soot
 

i have a white first gen and its covered get a coffee can or drill a hole. i use a good ol foldgers can! but remember to take it off befor u start it it bounces off my cab and dented it:argh:

oh man!

Absolutely.. in every single diesel I've put an exhaust/dp on I got better mpg's and power. Lets face it.. the stock exhaust, muffler, cat, and down pipe aren't quite what I would call conducive to good power and mpg's.

Yep a straigh-piped exhaust will drop egt's also due to less backpressure. But I know people who've had 4-5" exhaust systems, and upon putting stacks on, they dropped even more in their egt's.

hahahaha

I'd love to see some facts to back your MPG increase as well as EGT decrease when going from exhaust out the back to stacks... As well as HP increase... There is a guy running over 400hp on a stock obs exhaust with a 3" downpipe... The downpipe is restrictive but the rest of the exhaust isn't... You will gain little to no HP from doing an exhaust, your EGT's should drop but will not be significant especially when unloaded. Exhaust out the back or exhaust out stacks won't make one hell of a difference that you can monitor because you take the temperature at the manifold anyway so why would it change temps at the manifold if you have exhaust behind the tire, in front of the tire, or out stacks? I know I saw zero MPG increase with a straight piped exhaust vs stock exhaust. It has nothing to do with how much fuel you burn.

Well go post a thread on the ORG then and the guys that have personally witnessed it will post and lol at you. They've logged the egt differences between huge stacks and a rear fitted exhaust. Yes, we're talking a few hundred degrees difference.

I've personally logged my mpg increases with larger exhausts.

when i had a stack on my 94. it sounded totally different than the under body. but it will. any difference in mpg, no. power, no. did anything change other than sound, no. maybe you just think it did because it sounded different and you were coasting down more hills...

Explain to me how it can change the temp at the manifold a few hundred degrees please. Also explain how you mpg's will increase enough to calculate. Oh right.... If it's posted on the org it must be true... And again for hp, an exhaust might get you 10... Maybe...

95powersmoker, you mean to tell me you haven't heard of those super duper stack kits that get you a extra 93.599 HP? and get you a extra 20 Mpg on top of your current number, and drop EGT's 500 degrees? look on the org, they're out there! lol

Nope I haven't lol...

But if it's on the org....

the only thing i noticed with my stack was my right foot got heavier. which could mean higer EGT's :w2:

It wasn't me, but the one guy on the org, 351fifty, can tell you exactly his egt's w/ straight back exhaust and stacks. Take it up with him, not me.

Because there is less backpressure and more area for heat dissipation would be my guess.

As far as the exhaust only being 10hp, I call bs. There are systems by 42dd for Audi's (a 1.8 liter gasser, mind you) that are good for 30hp... you mean to tell me a 7.3 liter diesel is only getting 10 measly ass hp out of a larger, more free flowing exhaust setup? What kind of mileage does your truck get in city and highway driving? Maybe mixed driving?

when i first bought it, it was bone stock. i was getting about 16 mixed driving. now i'm still getting about 16 with the mods in my sig. but it runs a hell of alot better. the heat dicipation, it's 8 feet away from the manifold......

Yes I mean to tell you that you are not getting more than ten horsepower out of an exhaust...

I get 16-20. You can not and should not compare what an Audi get's with an exhaust to what a Powerstroke Diesel gets... And to clear up an misunderstandings, the turbo creates all the backpressure your engine needs, therefore your hypothesis needs some work. Also, I don't care to take it up with mr. org, you can believe everything he tells you but I won't. I didn't change MPG when going from stock exhaust to 3" dp with 4" dual exhaust... I wonder if mr. org thinks dual exhaust would drop the egt's 2x the amount because there is 2x the exits....

As far as being 8ft away from the manifold.. it's called a heat sync. The length and diameter of the pipe relays the heat further and further out until it dies out.

I call bs on a full exhaust only giving 10hp on a 7.3psd. I understand comparing 2 different types of motors and manufacturers is rather silly, nut the point is if a 1.8liter turbo motor can pick up 30hp with an exhaust larger than a stock powerstrokes, that a powerstroke wont gain any hp ditching the same size piping that a 4banger has on it?! Thats ignorant.

351fifty on the org has verified per his pyro the egt drop.. it's not being pulled out of anybodies ass.

Ya, When I built my dual exhaust, I was really hoping to get 2x the power of regular straight pipe cuz I had two exits. I surely thought that was going to do it. Also was hoping to gain 6mpg's over the standard 3 that most people get with straight pipe...

Oh, checked out your Org buddy's post... Looks like he had his pyro in the downpipe... Also came across a post over there by a vendor that said "the stacks look and sound better but wont give you any more hp or egt drops than running a straight piped 4" kit"... Now, don't you think if they actually did do those things, He would be telling everybody so he can sell more of them...

Intake and Exhaust are important, but I just don't see them as that important to worry over a few hp gains... You won't notice it. The truck will sound better, that's about it. If you truly think you gained 30hp with your stacks and picked up mpg's, great, but I don't believe everything I read on the box my intake and exhaust came in. And I certainly don't believe a guy that dropped 300* with stacks with his pyro in his downpipe...

The gain from an exhaust comes in that you are removing the flat downpipe and possibly getting rid of a clogged catalytic converter...A 4" exhaust is not that much bigger than your 3.5" factory exhaust and your factory muffler is perfectly fine to run power through.

I gained no noticeable hp from an exhaust and intake, and my mpg's did not change enough to credit them with gaining any fuel efficiency.

well if the pyro probe is in the DP, it's probably showing cooler. i wonder why... oh that's right, it's not accurite. it can very a few hundred degrees up or down.

When I straight piped mine it had better throttle response and was maybe a hair quicker but im not going to say it gave me 10+hp more. I changed 0 on my mpg. You are taking what you read as the truth.

I gained a seat of the pants performance increase as well as better mileage from installing my 5" exhaust and 3" dp fyi.

I'm not taking what I read as the truth.. I"m taking my experience of owning 39 cars as truth.

39 CARS or POWERSTROKES' i've owned 3 powerstrokes. 2 OBS, 1 SD. not a dam bit of mileage or performance gains with exhaust, stacks OR out the back.

39 cars. 2 powerstrokes. 1 cummins. 1 tdi. Every single diesel I've done at a minimum an intake/exhaust to, and on all trucks I saw an improvement in mileage. With intake/exhaust my superduty was sitting at 21mpg city, my cummins around 20mpg city, my HD 18mpg city, and my tdi... well, it's a tdi....

don't bring the TDI into this. that doesn't even compare. thoser what? a 1.3L or something? what's your elevation where you are?

Ya I know thats why I didn't elaborate into that one :lol: It's a 1.9 btw.

But I'm about sea-level... 600ft over, if that.

1.9... dam! that's a big one there...

That could play a part tho. if i go up to about 12,000 feet. it's a smokey pig that only gets 13 mpg. at 5- 6,000 feet i get about 16 mpg.

Really?! I had no idea that elevation played that big a part in mpg/smoke!!!:s:

600 feet vs 6,000 feet. you'll get 20. i'll get 16

Dang diddly I didn't know the impact was that great