2.5" or 3" for a TT

G35guy84 · 12-09-2009, 06:09 PM

Quote:

Originally Posted by Togo

Tony had mentioned tackling a TT kit at some point. I think right now though he is still finishing up orders and his LTHs. I'm really interested to see what he'd fab up and I'm sure he'd custom make a 3" exhaust for a TT setup

And give us guys who've already bought the 2.5" exhaust a huge discount on the 3".

Togo · 12-09-2009, 06:27 PM

Quote:

Originally Posted by G35guy84

And give us guys who've already bought the 2.5" exhaust a huge discount on the 3".

Dude he probably would just for the repeat business!!

Minicobra1 · 12-09-2009, 07:43 PM

My 2 cents, and I'm not a Turbo expert, but I know that on alot of smaller 4 cylinder motors such as my Turbo Mini Cooper, we went with a 3" exhaust because of the amount of boost we were running on the front end, which is 18psi.
I think all the Turbo aps for the 370z from Greddy, AAM, GTM, etc. are in the 6 to 9psi range, because of the hi-compression pistons in our motor. I know a lot of the experts out there recommend running 3" in anything that is pushing over 300whp. how much more power you could get out of the 3" is to be seen, IMO I think you could probably get to 500whp with a 2.5 exhaust that has good flow. There is a lot more to flow then just the diameter of the tubing, cats, resonators, mufflers, tubing bends all play a role. Bottom line is if you are going to be for sure boosting the car later on, you should probably talk with whoever is going to be supplying the kit and building it, most of them are designing the exhaust around that application.

kannibul · 12-09-2009, 09:40 PM

Quote:

Originally Posted by Minicobra1

My 2 cents, and I'm not a Turbo expert, but I know that on alot of smaller 4 cylinder motors such as my Turbo Mini Cooper, we went with a 3" exhaust because of the amount of boost we were running on the front end, which is 18psi.
I think all the Turbo aps for the 370z from Greddy, AAM, GTM, etc. are in the 6 to 9psi range, because of the hi-compression pistons in our motor. I know a lot of the experts out there recommend running 3" in anything that is pushing over 300whp. how much more power you could get out of the 3" is to be seen, IMO I think you could probably get to 500whp with a 2.5 exhaust that has good flow. There is a lot more to flow then just the diameter of the tubing, cats, resonators, mufflers, tubing bends all play a role. Bottom line is if you are going to be for sure boosting the car later on, you should probably talk with whoever is going to be supplying the kit and building it, most of them are designing the exhaust around that application.

That's kind of screwy since I'm approaching 300WHP without Forced Induction...

Less boost = less pipes. Also consider that 3" exhaust on a 4 banger is 3/4" per cylinder. For the Z, that'd be 2.25" per side...

12-09-2009, 07:43 PM	#3 (permalink)
Minicobra1 A True Z Fanatic Join Date: Nov 2008 Location: Orange County, CA. Posts: 1,205 Drives: 370Z Tour, Spt, 6mt Rep Power: 646	My 2 cents, and I'm not a Turbo expert, but I know that on alot of smaller 4 cylinder motors such as my Turbo Mini Cooper, we went with a 3" exhaust because of the amount of boost we were running on the front end, which is 18psi. I think all the Turbo aps for the 370z from Greddy, AAM, GTM, etc. are in the 6 to 9psi range, because of the hi-compression pistons in our motor. I know a lot of the experts out there recommend running 3" in anything that is pushing over 300whp. how much more power you could get out of the 3" is to be seen, IMO I think you could probably get to 500whp with a 2.5 exhaust that has good flow. There is a lot more to flow then just the diameter of the tubing, cats, resonators, mufflers, tubing bends all play a role. Bottom line is if you are going to be for sure boosting the car later on, you should probably talk with whoever is going to be supplying the kit and building it, most of them are designing the exhaust around that application. __________________ 370z Tour\| Spt Pack\|Navi\|BERK CBE\|Berk HFC's\| Eibach Springs\| Hotchkis Sway Bars\|SPC Camber Arms\|15mm Ichiba Wheel Spacers\| 19"Factory Nismo Wheels-Matt Black\|Stop Tech Rotors\|TWM Shifter\|3M Tint\|Black Fangs\|Black Rear Valance\|JDM Fog Light\| MY BAND-www.myspace.com/petroleum

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