Newb FI question

fuct

;-)

sorry OP, back on topic

Mr.Squeeze

It is true you dont need a 3 inch to make 550whp on these cars, it has been proven with plenty of turbo cars out there. But now that there is a 3 inch exhaust available it just makes more sense to jump straight to it.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

bldg636

Thanks everyone for all the information.... Looks like, although not absolutely needed, it might make sense to go ahead and purchase the 3" exhaust now if I have my mind set on big power gains later down the road.... Anyone have any suggestions on good 3" exhaust systems? I looked at the greddy T IC exhaust system, but wasn't all too thrilled with the sound. Anything else out there worth looking at? Also, based on my research, I looks like I'll be opting for a GTM twin turbo kit, so any exhaust I get would need to be compatible with that. Thanks again for all of the help.... It's very much appreciated!

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Ross
'11 370z
Just getting started . . .

Mr.Squeeze

Get the Fast Intentions 3 inch exhaust it's the same one I have on my car. I use to have the Greddy TIC and now have the F.I exhaust, the link to my thread has dyno video's of both, on page 4 it's the F.I exhaust.

Real Auto Dynamics built and R/T tuned built motor TT


Fast Intentions 3" (Twin Turbo) exhaust is here!

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

bldg636

That would be a great option! I love the look and quality of the fast intentions systems. Would this be compatible with my current NA stock setup? Also, would I need to get any tuning done after install since the 3" system is a lot more open with less backpressure?

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Ross
'11 370z
Just getting started . . .

theDreamer

Please share who has done it and let them know to add to this thread: Forced Induction Finished Builds
Really trying to get a solid book of builds together from everything, so far I only have 1 build that made almost 550whp on a 2.5" exhaust and I really do not have much info from the guy other than he cranked the boost up above 10PSI to do it.

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Boosted Performance

The car made 550whp even, and please note that the actual boost pressure at max HP is about 9psi (10psi at 6,000rpm and falling). The reason the boost is up in the early rpms was due to having a manual boost controller. Because it is a manual boost controller, there was no way to controll boost in the upper rpm's (like haveing an EBC and the option to increase the duty cycle). So it was turned up so that we can be as close to 10psi as possible at max power. As a result the boost was up to 12psi at 4500rpm.





The reason I say the 2.5" dual will make a lot of power is because of that graph. There is no sighn of it tapering off. It is just a nice linear line, with no dips, and no falling off at the top.

This is a Boosted Performance single, twin scroll turbo with a Precision 6266 billet T4 1.0 a/r. 3" down pipe to a Y-pipe going to the F.I dual 2.5" exhaust system with 14" resonators.

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750WHP starting @ $7,500 to the door
FOR DETAILS VISIT: http://www.the370z.com/members/boosted-performance.html
FB: https://www.facebook.com/Boosted-Per...6303179791462/
IG @boostedperformanceyeg

theDreamer

Did you stop at 7k RPMs? Because after there is a drop off.

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theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN
theDreamer's Silvia // URAS // GREDDY
Houston Zs // Facebook // Twitter // Instagram

Boosted Performance

This would be a result of pulling timing, falling boost and flow limitation of the 1.0 a/r turbine housing...nothing to do with post turbo turbo exhaust.

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750WHP starting @ $7,500 to the door
FOR DETAILS VISIT: http://www.the370z.com/members/boosted-performance.html
FB: https://www.facebook.com/Boosted-Per...6303179791462/
IG @boostedperformanceyeg

Mr.Squeeze

Here is a GTM TT Stage 1 with the 2.5 Fast Intentions it was my friend's car the engine has sence blown up. The care did make 550Whp without a problem, as far as other gas cars there there are countless GTM threads with cars with 2.5 inch exhaust making power.

[IMG]

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

elliotty

Not trying to derail the thread, but for informational purposes - what caused the motor to fail?

bldg636

Mr. Squeeze..... Can I use the fast intentions 3" exhaust on my current NA setup? Or is this only for cars with the turbos? I will eventually be going to FI but would like to change the exhaust prior and would rather not have to do it twice

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Ross
'11 370z
Just getting started . . .

Chuck33079

Oh crap. The eternal backpressure debate.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

Zeuz

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Advant M310 // Tommy Shifter // Swift Springs // Fairlady Emblem // Seibon // Stillen //

SS_Firehawk

Just to clarify to everyone who thinks loss of back pressure means loss of low end tq. Your wrong. Because you have an enormous tube for an exhaust, it reduces the velocity of the exhaust leaving the motor. The domino effect is it reduces the scavenging effect or more simplistically, a vacuum effect of the exhaust assisting in pulling the gasses out of your cylinder. At low rpm, it's crucial in developing low end tq. The higher rpm you move up the power band, the less effect it will have because now the exhaust velocity is up to an acceptable point to continue scavenging. Exhaust size is critical to the amount of air your trying to move. A 3" dual exhaust will really only benefit you of your pushing 650-700hp at the crank or higher. 2.5" exhausts are perfectly sized for our motors until you start pushing some serious power.

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