CHRGDUP Denali
Oct 30, 2017 | 07:42 PM
#11
Thread Starter
On The Tree
Joined: Nov 2016
Posts: 191
Likes: 7
From: Baton Rouge, La
so my stock air box and tb are a bigger set back?
Oct 31, 2017 | 06:18 AM
#12
TECH Addict
Joined: Nov 2015
Posts: 2,101
Likes: 558
From: Coastal NC
Those manifolds were designed to flow a lot more than a set of truck manifolds that were designed for torque. He has a blower, torque isn't a problem anymore. When I added my kooks it unlocked an instant 30 or so rwhp. You will make more power with less boost, if you can't get the air out that your shoving into the motor you will just make heat. Get a set of long tubes and a y pipe and you won't believe how responsive it becomes! It really woke my truck up, besides the blower it's by far the best mod so far...
Oct 31, 2017 | 07:15 AM
#13
Thread Starter
On The Tree
Joined: Nov 2016
Posts: 191
Likes: 7
From: Baton Rouge, La
Those manifolds were designed to flow a lot more than a set of truck manifolds that were designed for torque. He has a blower, torque isn't a problem anymore. When I added my kooks it unlocked an instant 30 or so rwhp. You will make more power with less boost, if you can't get the air out that your shoving into the motor you will just make heat. Get a set of long tubes and a y pipe and you won't believe how responsive it becomes! It really woke my truck up, besides the blower it's by far the best mod so far...
Oct 31, 2017 | 11:21 AM
#14
Super Chevy did a test with a 427 stroker with a 2.9 kenne bell blower on it, they did both tests stock manifolds and long tubes on a engine dyno. The end results between the two was like 20hp and 5-6 ft/lbs just from the header swap alone. Of course results vary with application.
If someone just adds headers to an already supercharged engine they shouldn't be expecting the world from them. The scavenging effect of long-tube headers does help but someone shouldn't expect to see 30-50whp everytime.
There is likely another cause if you did see such an increase, like clogged cats, restricted exhaust past the manifold.
It's just why I commented and said they aren't the biggest player in the horsepower race. There can be more gain in other parts in the engine like camshaft, cylinder heads, compression ratio and tuning.
If someone just adds headers to an already supercharged engine they shouldn't be expecting the world from them. The scavenging effect of long-tube headers does help but someone shouldn't expect to see 30-50whp everytime.
There is likely another cause if you did see such an increase, like clogged cats, restricted exhaust past the manifold.
It's just why I commented and said they aren't the biggest player in the horsepower race. There can be more gain in other parts in the engine like camshaft, cylinder heads, compression ratio and tuning.
Oct 31, 2017 | 03:01 PM
#15
Thread Starter
On The Tree
Joined: Nov 2016
Posts: 191
Likes: 7
From: Baton Rouge, La
Super Chevy did a test with a 427 stroker with a 2.9 kenne bell blower on it, they did both tests stock manifolds and long tubes on a engine dyno. The end results between the two was like 20hp and 5-6 ft/lbs just from the header swap alone. Of course results vary with application.
If someone just adds headers to an already supercharged engine they shouldn't be expecting the world from them. The scavenging effect of long-tube headers does help but someone shouldn't expect to see 30-50whp everytime.
There is likely another cause if you did see such an increase, like clogged cats, restricted exhaust past the manifold.
It's just why I commented and said they aren't the biggest player in the horsepower race. There can be more gain in other parts in the engine like camshaft, cylinder heads, compression ratio and tuning.
If someone just adds headers to an already supercharged engine they shouldn't be expecting the world from them. The scavenging effect of long-tube headers does help but someone shouldn't expect to see 30-50whp everytime.
There is likely another cause if you did see such an increase, like clogged cats, restricted exhaust past the manifold.
It's just why I commented and said they aren't the biggest player in the horsepower race. There can be more gain in other parts in the engine like camshaft, cylinder heads, compression ratio and tuning.
Last edited by CHRGDUP_Denali; Oct 31, 2017 at 03:15 PM.
Oct 31, 2017 | 04:36 PM
#16
Staging Lane
Joined: Oct 2014
Posts: 97
Likes: 11
From: Saskatoon, SK Canada
Intake first, then headers. I put Kooks headers with performance cats on my stock truck. The stock airbox was definitely a restriction. Personally what I did was cut a hole in the factory lower airbox behind the headlight. I still have the factory catback exhaust.
Oct 31, 2017 | 09:01 PM
#19
Thread Starter
On The Tree
Joined: Nov 2016
Posts: 191
Likes: 7
From: Baton Rouge, La
I cut holes in the air box of my old truck. I can do that free mod you suggested for now if I wanted, but I will eventually be doing otherwise anyways. appreciate the suggestion.