Header Install
Intermediate
Joined: Apr 2012
Posts: 35
Likes: 0
From: Wentzville Missouri
That one is a very crude calculator. Their are a few others that take a lot of the setup into consideration. (A few are really way over detailed for anything but track-sea level, etc)
Overly large pipes can really screw with your low end torque. I was just on Jegs tonight looking for my exhaust system (bone stock factory stuff right now) and they had a pretty good chart of staying within the bounds, and a quick breakdown of limiting the hp with too small and the loss of torque with the too large pipes. I have been shopping my area (just moved, so I want a feel of the speed shops here) for who is gonna do mine, and every one said don't go above the 2.5" on a small block unless you are pushing major rpms.
http://www.exhaustvideos.com/faq/how...diameter/#easy
This one has a chart based on cfm.
Use this for cfm calculation: http://www.csgnetwork.com/cfmcalc.html
VE is safe arround 80 for most purposes, and then add 5-10%.
I love the sound of big pipes, but I don't want to suggest them unless they are required.
Overly large pipes can really screw with your low end torque. I was just on Jegs tonight looking for my exhaust system (bone stock factory stuff right now) and they had a pretty good chart of staying within the bounds, and a quick breakdown of limiting the hp with too small and the loss of torque with the too large pipes. I have been shopping my area (just moved, so I want a feel of the speed shops here) for who is gonna do mine, and every one said don't go above the 2.5" on a small block unless you are pushing major rpms.
http://www.exhaustvideos.com/faq/how...diameter/#easy
This one has a chart based on cfm.
Use this for cfm calculation: http://www.csgnetwork.com/cfmcalc.html
VE is safe arround 80 for most purposes, and then add 5-10%.
I love the sound of big pipes, but I don't want to suggest them unless they are required.
Intermediate
Joined: Apr 2012
Posts: 35
Likes: 0
From: Wentzville Missouri
#1. Sweet vette!
#2. actually, that is about right. Your vette is pushing hard, so you are basically within bounds of the 2.5-3.0 inch. If you are racing it when you get to go WOT, 3 inch are about right. If it is a street runner stop light killer, you may even benefit from the tighter pipes. The 500+ hp is the cross over. Bigblock with mild setup (regular RPM) versus your small block(with higher RPMs) probably balance out cfm wise.
and #3. Sweet Vette! (so nicehad to say it twice)
Thread Starter
Burning Brakes
Joined: Nov 2007
Posts: 1,213
Likes: 2
From: Cincinnati oh
That one is a very crude calculator. Their are a few others that take a lot of the setup into consideration. (A few are really way over detailed for anything but track-sea level, etc)
Overly large pipes can really screw with your low end torque. I was just on Jegs tonight looking for my exhaust system (bone stock factory stuff right now) and they had a pretty good chart of staying within the bounds, and a quick breakdown of limiting the hp with too small and the loss of torque with the too large pipes. I have been shopping my area (just moved, so I want a feel of the speed shops here) for who is gonna do mine, and every one said don't go above the 2.5" on a small block unless you are pushing major rpms.
http://www.exhaustvideos.com/faq/how...diameter/#easy
This one has a chart based on cfm.
Use this for cfm calculation: http://www.csgnetwork.com/cfmcalc.html
VE is safe arround 80 for most purposes, and then add 5-10%.
I love the sound of big pipes, but I don't want to suggest them unless they are required.
Overly large pipes can really screw with your low end torque. I was just on Jegs tonight looking for my exhaust system (bone stock factory stuff right now) and they had a pretty good chart of staying within the bounds, and a quick breakdown of limiting the hp with too small and the loss of torque with the too large pipes. I have been shopping my area (just moved, so I want a feel of the speed shops here) for who is gonna do mine, and every one said don't go above the 2.5" on a small block unless you are pushing major rpms.
http://www.exhaustvideos.com/faq/how...diameter/#easy
This one has a chart based on cfm.
Use this for cfm calculation: http://www.csgnetwork.com/cfmcalc.html
VE is safe arround 80 for most purposes, and then add 5-10%.
I love the sound of big pipes, but I don't want to suggest them unless they are required.
