evochongi

iTrader: (7)

Im building 4 inches titanium exhaust and I don't find a 4 inches titanium muffler and v bandband help please

Bhsj13

is there a reason you are building a 4" exhaust? 3" should suffice for most.

evochongi

iTrader: (7)

Yes my friend put one on his car but aluminum and pick hp
I have 3 inche know

llDemonll

iTrader: (21)

You won't pick up HP going from 3" to 4" unless the 3" is restricting flow. Unless you're making 600-700+ whp, it's not

Bhsj13

a different tune could easily bump you up in power.

evochongi

iTrader: (7)

Bump help

llDemonll

iTrader: (21)

We did help. We told you to build a 3" exhaust because 4" is useless for 98% of evos

awhit17

iTrader: (6)

I have a friend who builds Ti exhausts...you're probably going to have to make your own muffler with that diameter

e_kobz

iTrader: (36)

If you insist on going bigger in diameter just order the ETS 3.5" Titanium Exhaust and never worry about it again.

ETS Michael

iTrader: (91)

There is always this exhaust

nemsin

iTrader: (19)

ETS offers a 4" Ti exhaust for the supra. Maybe they will sell you the "pieces" you need separately.
http://www.extremeturbosystems.com/E...st-System.html

D1andonlyantman

I'm no expert on this but isn't maintaining gas velocity important as well, especially on a turbo charged engine?? In a perfect world you'd want an exhaust that creates minimum back pressure so it doesn't restrict the engine but keeps the gasses flowing as fast as possible. Having a huge exhaust would lower the gasses speed making you lose power generated by the turbine I believe

nemsin

iTrader: (19)

I am no engineer, but I have always heard back pressure = bad.

I am sure the math is all very complex and all, but the Bill Nye example would be put a banana in your tail pipe to increase back pressure and watch the power drop.

Remove the exhaust and add a dump tube and watch the power go up.

D1andonlyantman

I agree back pressure is bad but high gas velocity is good, and to keep the velocity high there needs to be a certain amount of restriction in the exhaust. Like I said, I'm no expert but I think it's all about finding the right balance between keeping the backpressure as low as possible while keeping the gas velocity high. Keep in mind it's the exhaust gasses that spin up the turbo and it's not going to spin very fast if the gasses are barely moving.....

llDemonll

iTrader: (21)

The exhaust gasses play virtually no part in turbo spool after they've been exited from the turbo