Empire performance exhausts

[Jayking851]

Hey
For $500 I can buy a 3" exhaust for my ss. By the brand of empire performance. I haven't heard of this brand and usually cheap means ****.. You get what you pay for.. But the specs sound pretty good! 3" mandrel bent, tig welded 304 grade stainless steel.
Has any one heard of this brand, any one had experience with it or just know what it's like
Cheers

 

[Not_An_Abba_Fan]

Couldn't find anything apart from a Facebook page, the parts are definitely imported. Buy it and see, you can be the first to do a product review.

 

[PIR4TE]

One percent not happy, to be expected, but the eBay comments tell a tale:

 

[Not_An_Abba_Fan]

4 negative out of 199 is 2%....

 

[PIR4TE]

4 negative out of 199 is 2%....

Nah there's over 600 sales, thanks for checking my math! I've got a maths tip for ya: review Vizard's formula again... and riddle me this: Why does a 350 HP car that outputs 126-136 CFM need a 2.5" dia pipe (when 115 CFM / in^2 is all that's required) or were you referring to some sort of core flow sizing for mufflers?

 

[ari666]

are you chasing NAAF around JC looking for a shitfight?

 

[PIR4TE]

are you chasing NAAF around JC looking for a shitfight?

Naah, he's chasing me! :tease:

 

[Not_An_Abba_Fan]

Nah there's over 600 sales, thanks for checking my math! I've got a maths tip for ya: review Vizard's formula again... and riddle me this: Why does a 350 HP car that outputs 126-136 CFM need a 2.5" dia pipe (when 115 CFM / in^2 is all that's required) or were you referring to some sort of core flow sizing for mufflers?

I was referring to muffler flow capacity.

Where do you get that CFM figure for 350hp car? 350hp requires ~770 CFM. Even if you use the formula of engine displacement x max rpm / 3456 you still get ~620 CFM for an LS1.

Not chasing you at all lol, I'm just commenting in the threads that I have already replied to.

 

[PIR4TE]

I was referring to muffler flow capacity.

Where do you get that CFM figure for 350hp car? 350hp requires ~770 CFM. Even if you use the formula of engine displacement x max rpm / 3456 you still get ~620 CFM for an LS1.

Not chasing you at all lol, I'm just commenting in the threads that I have already replied to.

Ah, that's maximum theoretical intake CFM @ 100% efficiency, not what a stock GM V8 produces at the exhaust port.

Think about it, stand alone L92 heads and manifold combo on the flow bench @ 28" won't reach 310 CFM @ 0.600" lift (x2), and a stock VE lift at valve is 0.480" allowing 285 CFM (x2). So while the LS3 intake is better than previous models, the physical CFM limit is 570 CFM max, by the manifold.

A GenIV 6.0 makes 350 hp according to Holden, with Trapped Volumetric Efficiency of 85%
so using conversion of 1 x CFM = 1.67 HP, the intake is 178 CFM @ 28".

Given a stock cam, the GenIV exhaust to induction ratio is 72% - 74% so max exhaust CFM = 130 CFM @ 28"

 

[Not_An_Abba_Fan]

Add to that thermal expansion and you get a much higher CFM requirement of the exhaust than you would ever see in a bench flow test.