3inch exhaust limits?

1BADAIR

1BADAIR

Club Member
at what point does a 3 inch exhaust limit power?
Actually it necks down to 2.75 at the end of the Y-pipe for the 3 inch intermidiate pipe.
thinking about cutting the y-pipe and putting a flowmaster 3 inch merge and then maybe just put a bullet on the end for track days
 
its a daily driver. duals are race car stuff. ohh, and it will add weight.
maybe dual cutouts?
Its a single 3 inch hooker cat back now.
you think I would pick up a tenth or two with something else?
 
http://www.ls1tech.com/forums/2987587-post19.html

A 2.75” (stock) single system is good for a 310hp engine with zero loss…
A 3” Single system is good for a 370hp engine with zero loss…
A 3.5” Single system is good for a 503hp engine with zero loss…
A 4” Single system is good for a 657hp engine with zero loss…
A 2.25” dual system is good for a 457hp engine with zero loss…
A 2.5” dual system is good for a 513hp engine with zero loss…
A 3” dual system is good for a 812hp engine with zero loss…
 
1BADAIR said:
its a daily driver. duals are race car stuff. ohh, and it will add weight.
maybe dual cutouts?
Its a single 3 inch hooker cat back now.
you think I would pick up a tenth or two with something else?
Click to expand...

My car has 2.5" inch duals that don't tuck badly, and can't weigh much more than a single 3" system with catback.

I think your car is being restricted naturally aspirated somewhat. A tenth or two? I can't say for sure, but I think there would be a little bit to be gained.
 
1BADAIR said:
the 3 inch says 370 with 0 loss. any info about how much of a loss for say, every 100 above 370?
Click to expand...

That I don't know exactly. I know N/A you need 2.2cfm per horsepower for a quieter, zero restriction, exhaust with zero loss. But exactly how much of a restriction it is, I don't know.
 
PaxNovi 5.0 said:
http://www.ls1tech.com/forums/2987587-post19.html

A 2.75” (stock) single system is good for a 310hp engine with zero loss…
A 3” Single system is good for a 370hp engine with zero loss…
A 3.5” Single system is good for a 503hp engine with zero loss…
A 4” Single system is good for a 657hp engine with zero loss…
A 2.25” dual system is good for a 457hp engine with zero loss…
A 2.5” dual system is good for a 513hp engine with zero loss…
A 3” dual system is good for a 812hp engine with zero loss…
Click to expand...

PaxNovi 5.0 said:
That I don't know exactly. I know N/A you need 2.2cfm per horsepower for a quieter, zero restriction, exhaust with zero loss. But exactly how much of a restriction it is, I don't know.
Click to expand...

I was going to say those must only be for N/A or even possibly blower cars.
 
CableGuy said:
I was going to say those must only be for N/A or even possibly blower cars.
Click to expand...

I don't believe meeting the 2.2cfm/hp requirement is quite as detrimental on a Forced Induction setup as it is on a N/A or Nitrous setup. Free flowing exhaust is definitely important, I just don't think it quite as crucial on FI.
 
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