Anyone tried these HEADERS? - Defender Source
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  #1  
Old October 26th, 2005, 01:42 AM
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Arrow Anyone tried these HEADERS?

Hey, these could ROCK. Anyone?

http://cgi.ebay.com/ebaymotors/ws/eB..._BIN_Stores_IT
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  #2  
Old October 26th, 2005, 02:21 PM
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I've seen those on ebay as well, I'd love to add a pair to the supercharged 4.0 but certainly would like to hear some experience first
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Old October 26th, 2005, 06:43 PM
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Hmmm, don't look too bad. I'd prefer a tri-y style, but these don't look too bad at all. I just wonder if it's really going to fit in all the listed vehicles, and if the O2 sensor bung is the correct threads.

Oh, and don't forget to budget a new exhaust as well, since it's definitely not compatible with the factory Y-pipe.

-Hans
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  #4  
Old October 26th, 2005, 07:15 PM
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1/4" flange seems kinda thin.
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  #5  
Old October 26th, 2005, 09:30 PM
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Quote:
Originally Posted by wicks
Gems compatability? From the minimal research I have done the GEMS system will try to get the truck back to stock settings regardless. . . (rpiv8.com source here. Not much else out there on the sagem)
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Old October 26th, 2005, 10:20 PM
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Is it a matter of cost? JanSpeed in the UK has been making Rover V8 headers for years. There is apparently an issue with left-hand drive trucks like our NAS about getting them to fit properly...
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Old October 26th, 2005, 11:40 PM
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With a GEMS system you would need to also add the 2 post-cat O2 sensors. It doesn't measure anything else in the exhaust other than the oxygen content before and after the cats in order to set the mixture. Since they are all heated O2 sensors, you should be fine.

1/4" flanges should be fine in this application, since each exhaust port gets it's own pair of dedicated bolts and the area is small. Not like on a SB Chevy where the central ports are siamesed and have a longer distance between bolts, and less to go around.

-Hans
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  #8  
Old October 27th, 2005, 12:22 AM
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Quote:
Originally Posted by Hans

1/4" flanges should be fine in this application, since each exhaust port gets it's own pair of dedicated bolts and the area is small. Not like on a SB Chevy where the central ports are siamesed and have a longer distance between bolts, and less to go around.

-Hans
Started thinking about that myself after I made my comment. I wonder what the HP increase is with headers over manifolds. I am planning a new cam in the next few months and may look into these headers as well.

Kevin
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Old October 27th, 2005, 05:12 AM
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Those look pretty interesting... but I still think you'll run into issues with heat and warped flange.
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  #10  
Old October 27th, 2005, 08:29 AM
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Quote:
Originally Posted by Doug
Is it a matter of cost? JanSpeed in the UK has been making Rover V8 headers for years. There is apparently an issue with left-hand drive trucks like our NAS about getting them to fit properly...
The Janspeed headers will fit LHD LRs. Dan Chapman has them on his Discovery along with a few other customers. The Headman's need to be "adjusted" to clear the steering shaft.

Another pic, and one more.
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Old October 27th, 2005, 10:35 AM
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Nice. John, what do your customers say about the results of the change to Janspeeds?

DW
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