HCI build, 1 7/8” vs 2” headers
11-18-2020, 08:30 PM
#21
Instructor
Thread Starter
What heads and cam are you on currently? My car made 581whp last week with fixed/milled heads, Ragin Racing Punisher cam, and a high ram. I’m hoping the B3, ported heads, ported high ram, and the UD pulley get over the 630 mark. Ive seen 2 other similiar setups make 646whp and 654whp but we will see what happens.
11-19-2020, 10:58 AM
#23
Melting Slicks
Pro Mechanic
Member Since: Nov 2013
Location: Ex DPRK, now just N of Medford, OR
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What heads and cam are you on currently? My car made 581whp last week with fixed/milled heads, Ragin Racing Punisher cam, and a high ram. I’m hoping the B3, ported heads, ported high ram, and the UD pulley get over the 630 mark. Ive seen 2 other similiar setups make 646whp and 654whp but we will see what happens.
Planning to go with the BTR stage II cam, ported MSD, and a bump in compression TBD.
I'm thinking around 12.5:1 Oregon has 92 octane, and for as little as I drive the car, I have no problem blending in 100UL or using octane booster.
11-19-2020, 03:54 PM
#24
A guy posted a dyno of before and after 2" header swap, and gained 24RWHP. I don't see how people keep arguing this, with facts right in front of them. He lost a tiny bit of horsepower in the mid range.
11-19-2020, 05:31 PM
#25
Race Director
See my Post #5 above re the dyno runs. Unfortunately the comparison was 1 7/8" Tri-Y vs standard 2" 4 into 1. Who knows how much difference that makes. I did the back to back runs so I could provide the info to the forum as the forum has given me so much valuable info.
11-19-2020, 08:52 PM
#27
Race Director
11-19-2020, 09:49 PM
#28
Melting Slicks
Last edited by JMB; 11-19-2020 at 09:51 PM.
11-19-2020, 11:18 PM
#29
Race Director
Following this forum for ~10 years I don't ever recall anyone actually providing back to back same brand dyno runs with no other mods done at the same time. When I posted mine originally there was a lot of talk about doing back to back same brand, but no one ever stepped up and posted it.
Last edited by AzDave47; 11-21-2020 at 03:07 PM.
The following users liked this post:
JMB (11-20-2020)
11-21-2020, 02:42 PM
#30
Drifting
I think some guys saw 6-10 and decided it is not worth it if you straight swap. If you are buying new, do it.
11-22-2020, 06:44 PM
#31
Burning Brakes
I'd be willing to bet you are right in the ballpark. I did the upgrade from 1 7/8 stepped Kooks to 2" American racing because of new heads and for just the main reason i run nitrous. Obviously i gained power but i switched way too damn much sh#$ to even begin to speculate.
11-22-2020, 08:50 PM
#32
Race Director
I have followed this forum for 9 years and not seen back to back dyno of 1 7/8" 4 into 1 compared to ARH 2". That was one of the reasons I did my Pfadt/ARH back to back in 2017, lack of other info.
11-25-2020, 09:56 PM
#33
Drifting
11-26-2020, 11:01 AM
#34
11-26-2020, 11:05 AM
#35
The LG merge collector headers are a copy of the old WHEEL TO WHEEL World Challenge headers, and in my opinion, they are hard to beat. My. 02 Happy Thanksgiving all......
11-26-2020, 11:39 AM
#36
11-26-2020, 04:01 PM
#37
Race Director
11-26-2020, 09:53 PM
#38
Racer
I'm currently running the LG 1-3/4" headers on mine(on the car when I bought it, installed in 2007.)
When the car was stock I loved them, but they are most likely leaving a lot on the table since I added a big cam, mamo msd & E85.
I'm going to go with the ARH 2" headers on the simple fact that if I'm going to change headers, I'm going to go big since the other components are have been as such lol.
For reference my car made 544rwhp on a hub dyno(heart breaker dyno) w/ cam, 1-3/4" headers, milled heads, e85. - I'm hoping to pick up another 30ish-RWHP with adding Mamo MSD and ARH 2" headers.
If I had 1-7/8" already I would not switch, that is a lot of work for not much result.
When the car was stock I loved them, but they are most likely leaving a lot on the table since I added a big cam, mamo msd & E85.
I'm going to go with the ARH 2" headers on the simple fact that if I'm going to change headers, I'm going to go big since the other components are have been as such lol.
For reference my car made 544rwhp on a hub dyno(heart breaker dyno) w/ cam, 1-3/4" headers, milled heads, e85. - I'm hoping to pick up another 30ish-RWHP with adding Mamo MSD and ARH 2" headers.
If I had 1-7/8" already I would not switch, that is a lot of work for not much result.
11-27-2020, 10:54 PM
#39
Melting Slicks
I'm currently running the LG 1-3/4" headers on mine(on the car when I bought it, installed in 2007.)
When the car was stock I loved them, but they are most likely leaving a lot on the table since I added a big cam, mamo msd & E85.
I'm going to go with the ARH 2" headers on the simple fact that if I'm going to change headers, I'm going to go big since the other components are have been as such lol.
For reference my car made 544rwhp on a hub dyno(heart breaker dyno) w/ cam, 1-3/4" headers, milled heads, e85. - I'm hoping to pick up another 30ish-RWHP with adding Mamo MSD and ARH 2" headers.
If I had 1-7/8" already I would not switch, that is a lot of work for not much result.
When the car was stock I loved them, but they are most likely leaving a lot on the table since I added a big cam, mamo msd & E85.
I'm going to go with the ARH 2" headers on the simple fact that if I'm going to change headers, I'm going to go big since the other components are have been as such lol.
For reference my car made 544rwhp on a hub dyno(heart breaker dyno) w/ cam, 1-3/4" headers, milled heads, e85. - I'm hoping to pick up another 30ish-RWHP with adding Mamo MSD and ARH 2" headers.
If I had 1-7/8" already I would not switch, that is a lot of work for not much result.
11-27-2020, 10:59 PM
#40
Race Director