Why no more inline 6
Lexus Test Driver
Joined: Sep 2006
Posts: 1,230
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From: WA
I'll just post them again for good measure:
http://youtube.com/watch?v=TJr0fxZE5...elated&search=
http://youtube.com/watch?v=1Wa4RwVlc...elated&search=
http://youtube.com/watch?v=mr6pnkbXM...elated&search=
http://youtube.com/watch?v=szMUTv9VR...elated&search=
http://www.youtube.com/watch?v=W_0RQ5oV0vI&NR
http://www.youtube.com/watch?v=5ibm7dDkPps&NR
http://www.youtube.com/watch?v=q3uJT...elated&search=
http://www.youtube.com/watch?v=8nGxH...elated&search=
http://www.youtube.com/watch?v=pIDzCK-InXo
http://www.youtube.com/watch?v=q77w0...elated&search=
http://www.youtube.com/watch?v=MXReG...elated&search=
Not saying they're king of the hill, but they were and are very, very good engines.
Last edited by mavericck; Jan 13, 2007 at 07:23 PM.
It's obvious you are very knowledgeable about the 2JZ heads. On a related topic, will equal length headers like these OBX ones make any difference in low end torque and hp for the 2JZ-GE?
I've heard that in NA engines, all its does is lose low end torque and make the exhaust very loud and noisy. Also you may fail emissions testing.
In other words, is this mod worth the trouble?
I've heard that in NA engines, all its does is lose low end torque and make the exhaust very loud and noisy. Also you may fail emissions testing.
In other words, is this mod worth the trouble?
Headers don't make the exhaust noisy. Lack of effect sound abatement makes the exhaust loud. Again, peak numbers prefer loud exhausts and peak numbers sell product, so we get these really loud and only marginally useful bits. I'd personally prefer to have 95% (or more) of peak torque from 2.5k rpm to red line and give away a few ponies at peak power because I am so rarely there while driving on the street. I'd have a completely different perspective if its a race engine, and I'd probably be building the engine to make best torque over the last 3k rpm of operation and let the rest fall where it may (and hope I can get it to idle with some civility, but not lose sleep over it.)
There are lots of things you can do to improve exhausts, but you won't find them on those made in Thailand headers you find from so many shops today. They're primarily focused on making the outside of the header pretty (again, that's unfortunately what sells), and not too worried about getting the merge zones clean on the inside. You really do get what you pay for and often you can't see why something costs what it does until you install it and run it.
Pole Position
Joined: May 2004
Posts: 2,602
Likes: 89
From: Singapore
Entirely untrue. Headers can be tuned to make good low end torque as easily as they can be tuned for good high end torque. Marketing has a harder time selling them because the peak numbers aren't big (it's a trade off), and peak numbers sell. The unfortunate thing is, for a street application, the better low end torque is almost always more funt to drive and feels more responsive.
Headers don't make the exhaust noisy. Lack of effect sound abatement makes the exhaust loud. Again, peak numbers prefer loud exhausts and peak numbers sell product, so we get these really loud and only marginally useful bits. I'd personally prefer to have 95% (or more) of peak torque from 2.5k rpm to red line and give away a few ponies at peak power because I am so rarely there while driving on the street. I'd have a completely different perspective if its a race engine, and I'd probably be building the engine to make best torque over the last 3k rpm of operation and let the rest fall where it may (and hope I can get it to idle with some civility, but not lose sleep over it.)
There are lots of things you can do to improve exhausts, but you won't find them on those made in Thailand headers you find from so many shops today. They're primarily focused on making the outside of the header pretty (again, that's unfortunately what sells), and not too worried about getting the merge zones clean on the inside. You really do get what you pay for and often you can't see why something costs what it does until you install it and run it.
Headers don't make the exhaust noisy. Lack of effect sound abatement makes the exhaust loud. Again, peak numbers prefer loud exhausts and peak numbers sell product, so we get these really loud and only marginally useful bits. I'd personally prefer to have 95% (or more) of peak torque from 2.5k rpm to red line and give away a few ponies at peak power because I am so rarely there while driving on the street. I'd have a completely different perspective if its a race engine, and I'd probably be building the engine to make best torque over the last 3k rpm of operation and let the rest fall where it may (and hope I can get it to idle with some civility, but not lose sleep over it.)
There are lots of things you can do to improve exhausts, but you won't find them on those made in Thailand headers you find from so many shops today. They're primarily focused on making the outside of the header pretty (again, that's unfortunately what sells), and not too worried about getting the merge zones clean on the inside. You really do get what you pay for and often you can't see why something costs what it does until you install it and run it.
There was no dyno documented improvements in torque or hp :
https://www.clublexus.com/forums/sho...d.php?t=219863
Is this a problem with the design of the headers itself or was the installation not done properly?
Or is it that the 2JZ-GE doesn't respond well to exhaust mods short of turbocharging?
Last edited by natnut; Jan 14, 2007 at 07:21 AM.
Thread Starter
Pole Position
Joined: Mar 2004
Posts: 296
Likes: 0
From: Florida
also i don't think anyone would be hoping for 50mpg out of a TT 4L I6 sports car, people would be more interested in seeing if it can follow the reputation of it's smller 2jz, so without your foot in it 75% of the time you drive 30mpg+ out of TT 4l should be acceptable, look at the mpg of the LS series of engines.
According to this stickied thread on installation of aftermarket headers for the 2JZ-GE GS300, there was more smoke coming from the exhaust pipes and the exhaust sounded really loud after the OBX headers were put in
There was no dyno documented improvements in torque or hp :
https://www.clublexus.com/forums/sho...d.php?t=219863
Is this a problem with the design of the headers itself or was the installation not done properly?
Or is it that the 2JZ-GE doesn't respond well to exhaust mods short of turbocharging?
There was no dyno documented improvements in torque or hp :
https://www.clublexus.com/forums/sho...d.php?t=219863
Is this a problem with the design of the headers itself or was the installation not done properly?
Or is it that the 2JZ-GE doesn't respond well to exhaust mods short of turbocharging?
The perceived performance improvement is from removing the cats, not the header's design. It could be done far better, but not for eBay pricing.
Lexus Test Driver
Joined: Sep 2006
Posts: 1,230
Likes: 0
From: WA
Thread Starter
Pole Position
Joined: Mar 2004
Posts: 296
Likes: 0
From: Florida
Thread Starter
Pole Position
Joined: Mar 2004
Posts: 296
Likes: 0
From: Florida
well.......
Check this out: http://videos.streetfire.net/video/c...5a00b6f8b3.htm
i envy the 3.8 though, but put it in a sc, i was never much of a bmw fan, it just is'nt me.
he cant hook up for s#!t though...
Last edited by sc3boost; Jan 15, 2007 at 02:48 PM.
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