3" dp/full exhaust question

[drewkeen]

good/bad news guys...i looked at and asked again if that price was for mandrel bend...it was the pipe that gets a tad smaller from the bender smashing it, it did not have kinks in it however. is this still a good price for this or will mandrel make a lof of difference?

[Adambomb]

PROBLEM: Pipe diameter reduction is a common problem with OEM style bent tubing. In a sharp bend, this reduction may be as much as 20%. A 2" diameter pipe may see a flow reduction equivelant to a 1-3/4" diameter pipe. In effect, this reduces the entire system's flow capacity to the smaller dimension and increases backpressure.

SOLUTION: Mandrel bent tubing maintains its diameter throughout the length of tubing regardless of the bend. The flow capacity in the bend is the same as the straight-away. No reductions equals no added backpressure. All MagnaFlow system tubing is mandrel bent to assure system-wide high-flow.

Does this help at all?

[Adambomb]

here are examples

[Adambomb]

here are examples again

[drewkeen]

yeah, its oem bends...should i go mandrel or is the money better spent elsewhere?

[svobud]

Adambomb - what is your point of posting those ICONS? They're not examples of the exhausts we're discussing and don't illustrate your statements. They're ICONS ... with typed print stating the exact same words you're typing ... IOW, you're wasting our TIME and BANDWIDTH by posting them.

Sorry - but I'm not taking you're word of percentage loses from different types of exhausts. Nor am I buying your word about how the cat system you have installed on your car has dramatically improved performance. Especially without changing the diameter of your DP. Nor do I believe a turbo engine NEEDS backpressure to improve exhaust flow.

Drewkeen - if you want to know FACTUAL data about how much improvement you may see from an exhaust upgrade - take a look at my dyno results that were posted in the forum. I have a 3" DP - no cat - to 2 1/2" tails. 17rwhp gain.

[drewkeen]

thanks for the help Bud, i have seen you results, but thats is with mandrel bend, correct?

how much difference will i see in mandrel and "OEM" bend?

[svobud]

Originally posted by drewkeen
thanks for the help Bud, i have seen you results, but thats is with mandrel bend, correct?

yeah.

how much difference will i see in mandrel and "OEM" bend?

well ... if you want to 'assume' adambomb's percentage calculations are correct - you could expect a loss of 3 to 4 hp over what I gained. You're really not going to know factual results without a back to back testing of the two examples on the same car.

For the price your friend is offering to build an entire 3" setup - I'd say get it and don't worry about a possible 4hp difference.

[lonchair]

Originally posted by svobud
.....Nor do I believe a turbo engine NEEDS backpressure to improve exhaust flow.......

I'll have to ask my Dad to tell me the specifics again, but on some type of turbos used on industrial engines (military and other) that he worked on, some back pressure is needed for proper operation. Is this true for our engines, nope (their too tiny and wrong kind).

[drewkeen]

it may have to to with the fact that those much larger turbos are a lot mroe efficient than our small turbos.

[svobud]

Originally posted by lonchair
I'll have to ask my Dad to tell me the specifics again, but on some type of turbos used on industrial engines (military and other) that he worked on, some back pressure is needed for proper operation. Is this true for our engines, nope (their too tiny and wrong kind).

hehehe ... well, that statement of mine reflects that my turboing knowledge is limited to what works on a 2.3 .... and back pressure ain't part of it.

That and I was getting tired of his constant need to make reference to this exhaust of his in multiple threads.... as it almost started sounding like a "product pitch"

[svobud]

Originally posted by svobud

That and I was getting tired of his constant need to make reference to this exhaust of his in multiple threads.... as it almost started sounding like a "product pitch"

let me rephrase that ... he has stated the EXACT same thing in 3 different threads.

I've got an 85 and I was looking to do something about the cat and the pre cat back set up. I looked around and by chance I found a direct fit system from the turbo up untill the after cat flange. www.car-sound.com is were I found it. It increased my power with its high flow cat and it's manderal bent tubing. I love it. It also had no problem passing SMOG. The part number is # 23363. Call them at 1-800-990-0905.

yes, that's annoying.

[SVOeric]

and don't forget this little tidbit...

Adambomb: We've got 5 manderal benders at my work.
SVOeric : let me guess... you work for www.car-sound.com ???
Adambomb: NO, but we have made stuff for them in the past.
Thats how I heared about them.
I do get hook ups from them though, exept on my svo system.

[svobud]

Originally posted by SVOeric
and don't forget this little tidbit...

ohhhh.... I musta missed that one. This guy work for a company that SUPPLYS the awesome, neato, tight, dabomb Catalytic company? Or more - Adam is IN the exhaust buisness? And he's here pushing one of his customers ... I get it, IN a round about way (trying to stay under the radar ) he IS product pitching.

Funny how someone in the exhaust biz isn't smart enough to add a 3" DP to their 85 SVO for improved performance and think we're going to buy his cat because he installed it and "felt" an increase.

If this ain't the case Adam - then you need to start talking. Otherwise, you're about 2 steps out the door. READ our rules. You're a vendor .. and you're telling everyone how great a product that's made by one of your customers is. He sells more - you sell him more of your stuff ...

[Adambomb]

I'm sorry. I wasn't pitching. I did work with car sound 2 years ago but not anymore. This is a forum correct? I only wanted to state a product wich I thaugt worked great for me. Maybe it could work for others. I was exited about something that helped me and I was under the impression that nobody knew about it. It's too bad that you got the wrong idea about me but I just wanted to help. And in return I thaugt somone could help me out by giving me ideas on wich suspension would be good. I'm not here to make enemies, I'm here to seek out friends and better knowhow on a car that has the ability to bring us all together. Don't hate me for trying to help. If you don,t ever want me here again just let me know. But please be civil about it. Thanks