Dump Pipe Question

[sluggerS13]

hey, question,

everyone keeps saying the best exhaust is a 3" from the turbo back. does this include the dump pipe? what if it is a split pipe with seperate wastegate pipe? anyone know where i could get a decent priced split dump pipe from?

cheers

SluggerS13,

[chrissso]

Hey sup.

"Turbo Back" includes dump pipe. A split pipe is a dual piped dump pipe, one for turbine outlet and one for internal wastegate.

Talk to an exhaust shop. I have seen stainless split dumps on eBay for skylines - however, I have had exhausts shops write them off, they crack. They recommend a mild steel version.

...

[Guest tkch55]

i've got one of those stainless split dump which you replace the stock dump with in my car, and only just installed not too long ago

in theory, it helps holding the boost at higher revs, but i could only feel a bit of difference along with the slight difference in exhaust note

maybe it's because the seperation is too short like what SK said

construction looked quite solid but i hope it doesn't crack

has anyone else bought one of these?

[paulr33]

http://www.skylinesaustralia.com/forums/in...showtopic=74022

3" split dump, works awesome.

[sluggerS13]

so this answers my original question. the dump pipe is not 3''. i already have a SS front pipe, so i am after just the dump pipe.

[rs73]

I had HKS split dump, quite old bought 2nd hand and when I bought it, it doesnt seem to crack and works well (keep exhaust still reasonably quiet)... So I guess even stainless steel is prone to cracking compared to mild steel, it also all depends on the quality of the product. Most cheaper stainless steel items on ebay looks like HKS rip offs made in china, so maybe it'll not be as strong as the original one.

[xRHETTx]

Yeah i guess the split is not 3 inch all the way but it has less exhaust flowing through it the a true 3 inch dump, plus you get the benefit of the split.

[Guest tkch55]

the measurement of the main pipe in the hks style split dump turned out to be approx 2.5 inch

but think about it this way. at high rev when the engine needs the exhaust fumes to dissipate fast, while the turbo exhaust is coming out of the main 2.5 inch pipe, the wastegate gas is coming out from the seperate split pipe.

that sounds better to me than having the exhaust from the turbine and wastegate both dumped into a 3 inch pipe, especially when you take turbulance into consideration.

[Guest tkch55]

edit: accidental repost

Edited September 5, 2005 by tkch55

[R33_Series2Lover]

Sorry for hi jacking the thread but now im interested in this stainless steel cracking business?? Is it recommended that mild steel split dump is used?? Im regards to the cat back section,would it be a good idea to get the mild steel piping with a stainless cannon muffler??

Edited September 5, 2005 by R33_Series2Lover

[Guest tkch55]

i'm interested in that too..

my exhaust sys is stainless steel from the turbo to the end

i don't want anything to crack there..

but if i remember correctly, if it cracks it's usually at the weld?

[gt-t_r34]

i hope my exhaust wont end up cracking i just got a nur spec R system i think its the bees knees thou tig welding i doubt it will be cracking soon... being cat back it wont get as hot back there thou i was looking at getting one of thos batmbl split dump and front pipes... i want stainless because all the pipes look cool as in chrome from behind!

[JeeTeeEss25Tee]

anyone know the rough gain from 3" single dump pipe to the split pipe? was told by an exhaust shop to be about 3kw gain which is not significant.

[chrissso]

From what I have been told when speaking to exhaust shops, cheap stainless steel dumps can crack.. If the ex shop were to custom make a dump, they were going to make it out of mild steel. You get what you pay for in the end. I would very much doubt that a HKS stainless dump would crack.

The exhaust temp from the cat back is alot cooler so there is far less of a problem with cracks...