Getting RNR turbo back, 2.5 or 3"????????

[Lordpaxin]

ooohhh...

dude knows his stuff.

 

[Libila]

Yes my grandpa informed me which exhaust size it correct, douche.

For the person in question- a 2.5 will be perfect for your setup.

 

[Groomz]

[/QUOTE]Originally posted by WhipmastaFlex
where is Doug at? he rocks the 2.5" RnR turbo-back. if you really do not plan on going over a 16g, 2.5" would sufficient. i would recommend a 2.5" downpipe to a 3" cat-back set-up. the only people that NEED a 3" DP are those running a 60-1, FP Red, etc. basically, people running two fuel rails [/QUOTE]
Exactly. We see these videos of DSMs putting down 500+ horsepower with a 3 inch full exhaust, so we think we need the same thing. There are tons of threads on this and I'm going to look for the one I'm thinking of, but I read that obviously exhaust gases travel faster at the turbo turbine exit, so the larger tubing would not come into play as much as later down the exhaust when it cools down and slows down, needing more room to expand. An exhaust that steps up the diameter gradually allows the powerband to be more flexible. All out horsepower go as big as you can, good all around, 2.5 inch to 3 inch.

( Don't want to be throwing out bogus info though, so correct me if I'm wrong )

 

[ItsStockOfficer]

Your wrong. If you were correct a 2.5 inch downpipe would boost creep more then a 3 inch, the opposite is true however. The 3 inch cause more turbine flow then the wastegate can deal with.

For the person in question. 2.5 will be ADEQUATE. 3 inch will make more power. Period.

 

[RedTurboEclipse]

if u can afford to go 3" go 3"..

yes 2.5" is good enough. but 3" doesnt hurt.. better flow.. who knows.. maybe one day ull make enough power where it does matter that u got 3"

 

[ItsStockOfficer]

OMFG. It always ####ing matters because it will always spool much faster and make more power.

 

[doug]

Originally posted by ItsStockOfficer
it will always spool much faster and make more power.

"Always" is a big word. I have a hard time believing that 3" will ALWAYS make more power, until I see real comparison test numbers.

Don't get me wrong-- I'm trying not to be closed-minded. I'd pay good money to see an A/B comparison test on the same car with both exhausts installed in turn.

 

[Lordpaxin]

well, when i get my 3 inch, you send me a 2.5 inch aswell, and ill make a comparison.

as everyone knows, you start with 190hp, pretty soon your hitting 250, then 300.... once you go that far, why stop? you know everyone is gonna want more, I know ill prob want more, its best to get 3 i imagine

 

[ItsStockOfficer]

Originally posted by doug
"Always" is a big word. I have a hard time believing that 3" will ALWAYS make more power, until I see real comparison test numbers.

Don't get me wrong-- I'm trying not to be closed-minded. I'd pay good money to see an A/B comparison test on the same car with both exhausts installed in turn.

No, always. It will NEVER make less. Perhaps on a .2 liter engine the difference would be un measureable, but on a 2 liter you will always be able to find measureable gains, even on a t25.

 

[Groomz]

Originally posted by ItsStockOfficer
Your wrong. If you were correct a 2.5 inch downpipe would boost creep more then a 3 inch, the opposite is true however. The 3 inch cause more turbine flow then the wastegate can deal with.

For the person in question. 2.5 will be ADEQUATE. 3 inch will make more power. Period.

Just speaking from experience. I had a 1G with a 14b and it would creep to 20psi. Results may vary.

 

[WhipmastaFlex]

Originally posted by ItsStockOfficer
OMFG. It always ####ing matters because it will always spool much faster and make more power.

OMFG. throw a hissy fit. until someone takes a 250whp 16g DSM with a 2.5" turbo-back and bolts a 3" turbo-back and does a comparison, the arguing will continue. Maybe then, the -foot-in-mouth- will commence. From what i have always understood, and from what has always been posted for the most part, a 2.5" will create more low, but less top end power than a 3" on a moderate set-up. but until the dyno testing occurs, let's not get our panties in a wad

 

[ItsStockOfficer]

Please, explain how?