Simple Exhaust Questions

[vex]

Holy helpful posts batman!

Originally Posted by RETed

ATP Turbo?


-Ted

Yeah, I've checked with them. I will address the problems when I answer the other people below and you'll see why I'm asking for opinions on this problem.

Originally Posted by classicauto

What do you mean when you say "i'm not sure its necessary to be stainless (that close to the turbo)"

I wouldn't use anything else. If I had some mild tubing laying around and felt like it - I may use that - but stainless is where its at for exhaust IMO. I've found it can distort alot while welding though.

But yeah, ATP turbo has *EVERYTHING* you could want for building that. Minus perhaps an engine flange. IIRC, they have a T3 to 3" vband adapter they sell:

Here's one: http://www.atpturbo.com/Merchant2/me..._Code=ATP-FLS1

Another: http://www.atpturbo.com/Merchant2/me..._Code=ATP-FLS1

I have a Turbonetics 60-1 F1-62 Four Bolt T3 Turbo. If you read the bit about the first flange you posted, it's constructed out of mild steel. They do not sell an SS version of that flange which means I'd have to buy a V-Band flange and a regular T3 four bolt flange and have my friend weld it together. Not impossible but a little more work intensive than going with that mild steel flange.

The other option would be to just get the SS T3 flange and weld the pipe directly to it and avoid using the V-band at the Turbo.

Originally Posted by RotaryProphet

It does seem wasteful to go from 2.5" to 3"... with that bottleneck in there, there's either not going to be nearly enough flow to justify a 3" pipe, or there will be enough, but you'll have some serious backpressure issues in the manifold pre-turbo. Finding a T3 to 3" adapter might help, but it really depends on the size of the turbo itself.

Is it a real T3? Because they're very small turbos for a 13B, even on the smallish size for a 12A, really. Even a hybrid T3/T4 is going to have the smaller T3 exducer, which is bound to create a huge flow restriction unless you're running low boost (6 psi as a guesstimate, you'd need an exhaust backpressure gauge to find out where your "max" is) and have a large external wastegate which dumps back into the downpipe.

Turbo is a 60-1 F1-62 .77AR Turbonetics Inc Turbo. I'm not planning on running that big of boost pressure since this is HI-Compression. I'll be keeping an Eye on exactly how much boost I'm dumping into the engine.

Originally Posted by SpooledupRacing

I would say take your time and invest your money right the first time.

go all 3" and all SS piping..

and IMO (external gate that dumps to atmosphere FTW)


I also feel that a presilencer is junk.. IME (with racing beat) the presilencer only held up for maybe a month then it did not silence anything.

I'd rather have a presilencer than not as a visual inspection is still mandated by the state and a presilencer is usually mistaken for a Cat if I do not have one.

As for the Engine to Header Flange I saw MazdaTrix sells a SS version of it. I'm wondering though that with these prices if it won't be cheaper for me to just design them up in Inventor and shoot them over to the machine shop to get cut (talking about the flanges).

Would I need to worry about anything if I just made the Engine to Header flange out of a solid piece of SS? Where if you compare it to what MazdaTrix makes it looks to have some amount of relief on the back side of it, not sure if it's just for looks or actually is functional.

I also have an external Wastegate that will be dumping into the down pipe because I already get enough attention from the police. I need no more.

The other question I have would be this: Will I get a quiet enough exhaust note with just using a single 3" inlet 3" outlet muffler that racing beat sells or would I be better off sticking with a Y-Pipe and a 2.5" inlet and 2.5" outlet mufflers?