Race header vs. Race header
#1
Racer
Thread Starter
Join Date: Feb 2005
Location: Grand Haven, Mi
Age: 57
Posts: 448
Likes: 0
Received 0 Likes
on
0 Posts
Race header vs. Race header
I have noticed people commenting on how race headers are bad for our cars and "you'll lose a bunch of bottom end", "4-1 headers are bad for torque, and 4-2-1 headers are better for the street", "4-1 headers are only good for top-end power, and not the best pic for our long stroke TSX."
Well, I've been modifying Hondas/Acuras since 1989, peaking in 2002 with a 227 whp B18C5 engine in my '92 Civic CX race car.
Regardless, through many years of testing and experimenting with B16's and B18's I've found opening up the intake and exhaust have always helped. I remember running a JDM Spoon header with a 3" back exhaust and had gains EVERYWHERE!
So, taking this info, and applying it to a larger displacement engine I thought opening up the exhaust would be beneficial.
My first race header dyno was with the Weapon R race header, which has a 2.5" collector, see dyno.
I also had a spare Skunk2 header laying around. It is a 4-1 race header with a 2.25" collector.
The results are as follows:
Here we compare the Weapon R header 4-2-1 w/2.5" collector to the Skunk2 Race header 4-1 w/2.25" collector.
Look at that low end torque! It's huge!
Remember the difference between the two is only time and I added a Bilstein B12 suspension kit. Now the question is stick with 2.5" and build a custom 2.5" exhaust, or go with the 2.25" and build that. Not sure yet, we'll see.
Car mods are,
Intake resonator removed, stock paper filter.
Non-Stop tuning pulleys
Suspension:
Bilstein B12
That's all.
Well, I've been modifying Hondas/Acuras since 1989, peaking in 2002 with a 227 whp B18C5 engine in my '92 Civic CX race car.
Regardless, through many years of testing and experimenting with B16's and B18's I've found opening up the intake and exhaust have always helped. I remember running a JDM Spoon header with a 3" back exhaust and had gains EVERYWHERE!
So, taking this info, and applying it to a larger displacement engine I thought opening up the exhaust would be beneficial.
My first race header dyno was with the Weapon R race header, which has a 2.5" collector, see dyno.
I also had a spare Skunk2 header laying around. It is a 4-1 race header with a 2.25" collector.
The results are as follows:
Here we compare the Weapon R header 4-2-1 w/2.5" collector to the Skunk2 Race header 4-1 w/2.25" collector.
Look at that low end torque! It's huge!
Remember the difference between the two is only time and I added a Bilstein B12 suspension kit. Now the question is stick with 2.5" and build a custom 2.5" exhaust, or go with the 2.25" and build that. Not sure yet, we'll see.
Car mods are,
Intake resonator removed, stock paper filter.
Non-Stop tuning pulleys
Suspension:
Bilstein B12
That's all.
#2
where is my garage?!
iTrader: (2)
Join Date: Oct 2006
Location: nassau county, ny
Age: 47
Posts: 1,857
Likes: 0
Received 1 Like
on
1 Post
holy cow at that skunk2 header. i remember reading on the 'other' board that someone got the hondata reflash with the skunk2 and had a huge pop in their hp/torque on the dyno.
cool results, cool comparison.
cool results, cool comparison.
#4
Racer
Thread Starter
Join Date: Feb 2005
Location: Grand Haven, Mi
Age: 57
Posts: 448
Likes: 0
Received 0 Likes
on
0 Posts
Here are a couple photos of the Skunk2 race header. I took off the 2.25" merge collector and will be buying a 2.5" merge collector (as JTSo suggested) to put on, then sending it out to get coated.
BTW at the collector the 4 main pipes are 2" in diameter...much larger than I expected, I thought they were gonna be 1 7/8" max.
Notice how the header comes off the head nice and straight, taking advantage of the usable space in the engine bay. Nice header.
BTW at the collector the 4 main pipes are 2" in diameter...much larger than I expected, I thought they were gonna be 1 7/8" max.
Notice how the header comes off the head nice and straight, taking advantage of the usable space in the engine bay. Nice header.
Thread
Thread Starter
Forum
Replies
Last Post
rp_guy
Member Cars for Sale
9
07-16-2017 07:33 AM
lanechanger
Member Cars for Sale
4
10-13-2015 10:56 AM