My bad. Description on parts list said there was an S-pipe included. This looked like an S and it connected to the exhaust so just assumed that's what it was. Heh, shows what I know. :/

 

No worries. Just some new information you are armed with now.

 

Indeed! Thankies!

The PTuning exhaust looks great. The straight-through design makes me want it more. If it goes into production, I may have to swap the descendant out for it. Which means another tune and more $$$.

I'll soon be out of garage space, lol. Stock exhaust, TRD Muffler, and descendant exhaust will be taking up space, along with a slew of other stock parts and wheels. No more room for a car, hehe.

 

Time forbade classifieds ad

 

My apology in advance, I am new to the turbo world..I have a question for P-tuning or any other one with extensive boost knowledge, regarding exhaust sizing. Why 3" or 3.5" on such a small engine? I am old school edumacated on exhausts with V-8's. Plus I have extensive 2-stroke exhaust theory crammed in my head too. A strong 350 Chevy engine only needs 2.5" exhaust to make great power. Built BB engines need 3" to 3.5" exhaust for the massive air pumping. It seems to me you would have a broader, more useable power curve with 2.5" sized exhaust on a 2.5L engine running average boost, let's say 20psi or less. I could see where the huge piping would benefit someone running massive boost for racing apps. Larger than necessary exhaust kills power where you need it most, 1k to 3k rpms for a fun D.Driver. Bigger is not always better or so I thought?!

 

a jig is what you create after you make your first exhaust, so you no longer need the car to recreate the exhaust... Basically the Jig is something that is shaped like the exhaust tunnel under your car, so you can throw the pipe into and know where the bends should be. 1 Jig makes multiple exhausts.



20PSI is retartedly high in a stock 2.5L motor.

Basically, turboing a 2.5L engine, is the same idea as putting a big block in a car that came with a small block, you wouldnt keep the small blocks exhaust when using the big block motor...

 

The V8 you are describing also has 2 banks of 2.5” exhaust…that is two pipes at 2.5”.

Also, on a naturally aspirated engine, you are using the energy from the exhaust to scavenge the exhaust out of the cylinders and the smaller diameter exhaust gives a higher speed, therefore better scavenging…and more HP.

Now, on a turbocharged engine, you are using the exhaust to power a fan (compressor side of the turbocharger). Look at it this way, if you prop up a fan and choke off one side of it, you will not get the air movement and therefore not get the power to turn the compressor sided of the turbocharger. The compressor side of the turbocharger is just a fan in a duct; your exhaust pipe. The more air you get through that duct, the more power you will have to turn the compressor side of the turbocharger. The longer your pipe, the more restrictive it is…you need to relieve as much (back) pressure as possible.

The exhaust pipe on a turbo car just to direct the exhaust out away from the car, whereas on a naturally aspirated engine, the exhaust pipe is also used to scavenge the engine.

 

^^^This, or refer to my description for the simple minded answer... LOL

 

^my b. that was supposed to be sarcasm cause they were charging me over 2x the price of any other exhaust on the market even though they had plans for a project 2011 tC.

 

+1 on what's already been written. Also 20psi on a tC is in the 450-500whp range on a properly sized turbo. 450whp on a 2.5inch exhaust would be choking the turbine.

To add to this, it's already been dyno proven the 3" was the way to go, and has shown significant gains over the 2.5". 2.5" is good for say 280whp and below. You can run 2.5" up to 400whp, but you are defeating the purpose at that point.

 

Thanks guys, it all makes sense now. My only firsthand experience with a turbo car was built Grand National. He ran up to 24 psi when he really wanted to whoop butt. First time I saw that car launch I pooped myself.

 

I'm interested.

 

maybe its a stupid question but why are there no X or H Pipe exhaust system available? a '11 with a double 2x would look so awesome... :O

 

It's not a 6 or 8 cly motor.

 

isnt 2 cyl per pipe working aswell? we have alot cars that do have a double exhaust system here in germany without having more then 4 cylinders... maybe its not improving power but it looks badass

 

You answered your own question. Secondly, if you looked under those 4 bangers with dual exhaust, they don't have X or H pipes, nor do they have exhaust systems separating the banks into pairs. It's one exhaust all the way to the rear somewhere, and a second pipe is welded in for the 2nd muffler. I've never seen someone split two banks just for an exhaust system. You have a single header on the car on top of that. You would have to construct a header that separates the banks, and then somehow manage to fit to separating pipes down and under the car....for what..."A look"..There is a reason why you don't see this. It's not worth engineering.

 

Heck, even on a number of 6cyl cars it's just a 2nd pipe welded on. Watch on a cold morning and see where the exhaust is coming out. It's quite funny.

When I owned my '06 Pilot, many folks wanted to swap in the RDX dual exhaust, and one guy posted pics of one while on a lift, the weld they did for the 2nd pipe is so crimped it looks like it would restrict flow vs helping. Kinda sad.

 

 

Lustine Scion took delivery of the tC last Thursday. We were hoping to get the car back that Friday to finish up the tune. However, they have decided to keep the car til next week.

Once we get it back we will finish the tune and definitely post the final number.

Thanks,
Mike @ PTUNING

 

you guys should do a 93 pull and an e85 pull, since it has become so much more popular since the tc1 kit came out.