06-27-2012, 12:25 PM | #1 |
Drives: 2010 Camaro SS L99 Join Date: Apr 2012
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difference for the LT headers in 1 7/8 or 1 3/4
I need to know if you guys know the difference and which one is better, because I just buy the 1 3/4 LT HEADERS and I see other brands who make this in 1 7/8 to.....
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06-27-2012, 01:07 PM | #2 |
crazier than a coconut
Drives: 2010 2SS/RS LS3 Join Date: Jul 2010
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1 3/4 if you don't plan on making ridiculous HP...1 7/8 for ridiculous HP...and 2" for INSANE HP.
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06-27-2012, 01:12 PM | #3 |
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Generally when you use a header that is to big for your application you lose some torque down low. For LS3 applications a 1 7/8 tube seems to be a great blend for top end power and torque and doesn't seem to lose anything down low. The 1 3/4" seems to be lost to the LS3 Camaro's but would actually be suited just fine for a bolt on car but at the same price you'd be better off with the 1 7/8". I wouldn't recommend the 2" header to anyone under 800 HP or so.
Last edited by Juiced1; 06-28-2012 at 09:26 AM. |
06-27-2012, 01:18 PM | #4 | |
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Quote:
The only drawback to larger primaries is cost (and fitment to a lesser degree). You do not lose low end with these cars with increases in primary diameter.
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06-27-2012, 01:35 PM | #5 |
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I have 1 3/4" because I got a smokin' deal on a set of used ones. No way I could've turned them down. I don't have true back to back comparison because I've never switched them out. However, I can say my car still runs good at the track. I've even beat other Camaros that had the same basic bolt-ons but with 1 7/8" headers (difference being that I had suspension work and they didn't). My car dynoed about 3 less HP than the average 1 7/8" on the same shop's dyno.
All in all there is nothing wrong with 1 3/4" headers. You'll never notice or feel the difference in 3 or 4 hp. That being said, if I were to buy brand new and money not being an issue I would still lean towards 1 7/8" just in case you were to add a big cam or super charger down the road. If you know for sure you won't do that or you found a good deal on 1 3/4" then stick with that.
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06-27-2012, 01:40 PM | #6 | |
Drives: 2010 Camaro SS LS3 Join Date: Sep 2010
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Quote:
I went from SOLO cats to 1 7/8 headers and immediately noticed a difference. The way to maximize testing this, would be to cruise down the hiway at 65 mph in 6th gear (LS3), quickly increase the throttle position by a very small percentage and not only pay close attention to how much squat you feel but how quickly the mph increases. There is a noticable difference. Once you move up in the rpms it no longer is noticable and the opposite happens. It is hilly around and I noticed I had to give it more throttle to maintain a climb or downshift where-as before the headers it would climb no problem. Don't get me wrong, once up in the rpms the headers really shine.
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06-27-2012, 03:23 PM | #7 |
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if you have ported heads, go with the bigger ones. i went with 1 7/8 because that is how big the exhaust ports were. stock heads, go with 1 3/4.
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06-27-2012, 03:29 PM | #8 | |
Quit being a pu$$y
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I think 1 3/4 are a waste on these cars unless you get them for a CRAZY good price, like $100. I went with 1 7/8 but would swap to 2" on my bolt on car in a heartbeat if they weren't so expensive.
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06-27-2012, 03:54 PM | #9 | ||
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06-27-2012, 03:57 PM | #10 |
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No one really runs 1 3/4" on these cars. 1 7/8" are pretty much the same powe wise, and give you room to grow. The only exception is stepped headers. When designed right, a 1 3/4" stepped to 1 7/8" header can out perform a straight 1 7/8" header.
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06-27-2012, 04:02 PM | #11 |
chevy pride
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i seen test from someone i think it was jannetty racing that did a comparison
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06-27-2012, 04:30 PM | #12 |
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Yep, and that test showed that bigger primaries had higher tq and hp all the way through the rpm range. I want to see a single dyno that shows otherwise. Back pressure is a myth on modern fuel injected cars.
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06-27-2012, 05:02 PM | #13 |
Look into Kooks stepped headers if you can't decide. They start at 1 3/4 and step up to 1 7/8. My tuner showed me several dyno sheets with the same mods compared to mine on one sheet. Mine did better than the others in HP and TQ.
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06-27-2012, 05:05 PM | #14 |
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ARH 2" wouldn't be bad on a all out Heads Cam build like I see shops run on big builds!
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