Little project this week....

[SuperchargedRS 10+ year member]

watch those harnesses, I was always told to keep the angle ULTRA low otherwise it can compress your spine (which isnt all that much better then eating airbag) if you impact the car.

 

[desertheat 10+ year member]

Correct on the harnesses, they are at the correct angle verified by sparco. From the pic, it is more of an optical illusion as they are sagging. They are however right on the limit angle wise and I am having a custom harness bar / chassis brace made for them //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[RedlineAccord 10+ year member]

Is that the stock exhaust on the tC? Looks like the tip of the muffler I'm used to seeing on them. Just wondering...

 

[desertheat 10+ year member]

hehehe yep totally stock exhaust from the s-pipe back....

The s-pipe itself is a 3" custom made with 3" QTP electronic exhaust diverter to a straight pipe. So when cruising the car is quiet as oem with a ton more power of course... Open up the exhast diverter to a straight pipe just below the downpipe of the turbo and good lord... efficiency goes through the roof, so much is freed up, I see almost a 2 psi gain and the dyno shows +28whp gain.

I am not into the fart can sound. The diverter open sounds soooo freakin throaty and mean. LOVE IT!

 

[RedlineAccord 10+ year member]

Yea, but you know how much more you'd gain from going to a larger diameter piping on the rest of the exhaust system? Thats always an important mod for turbocharged cars. We just threw a 3 inch single exhaust on our club's turbocharged s2k a few months ago, gained about 20 horses.

 

[desertheat 10+ year member]

Yea, but you know how much more you'd gain from going to a larger diameter piping on the rest of the exhaust system? Thats always an important mod for turbocharged cars. We just threw a 3 inch single exhaust on our club's turbocharged s2k a few months ago, gained about 20 horses.

You think i will gain hp by running a larger exhaust when I can turn it into a straight pipe right off the turbo..? *LOL* Sorry I do not see your logic. For cruisng I do not need the flow and I like the car quiet. If I want to rip it up, all i have to do is flip a switch and it is 3" downpipe off the turbo and 3" right out the diverter //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Also I run a 2" open dump off a 44mm tial wastegate, when that sucker opens, even with the diverter closed, I would say I probably have more flow than a standard 3" fart can running a cat.

 

[RedlineAccord 10+ year member]

Maybe I'm not getting you... so you're running an electric cutout basically? An exhaust dump.... if I'm not mistaken, a turbocharged engine likes some sort of backpressure. Is it really best to just dump it not far off from the turbo?

 

[desertheat 10+ year member]

A turbo does not like backpressure after the turbine housing, any backpressure on the turbine wheel only slows it down & decreases spool rate //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Backpressure after the turbine is an internet myth, now a NA motor can definitly show certain gains depending on the design from a certain amount of backpressure and by the amount of backpressure and exhaust flow you can actually vary the peak hp and tq points. Case in point, you added a very high flow exhaust and picked up hp but most likley lost bottom end of it was n/a. That is because overall flow increased in the system and the same reason actual boost changes when you free up flow or restrict flow.

You can vary velocity / backpressure on the motor before the turbine housing with the manifold design such as log styles, ram horns, semi equal length, true equal length etc which can make a difference in spool rate and were the power is focused. Some have better top end, some better midrange. All depends on design.