Naptown Dave Posted July 12, 2013 Author Share Posted July 12, 2013 I definitely think you got a deal on that one. I hope to have mine finished this weekend. It would be great if there was a local LS guy with JCI mounts that would want to collaberate on some headers. There are a lot of challenges in getting these right. Shoot me some pics, we'll see what we can do. Quote Link to comment Share on other sites More sharing options...
CrayZ Posted July 12, 2013 Share Posted July 12, 2013 Will do, thanks Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted July 14, 2013 Author Share Posted July 14, 2013 Finished the primaries on the passengers side last night and the drivers side tonight. I had to put a miter in the primary closest to the mount on each side, I'm debating trying to bend a short piece of tube at work next week. It would look better for the pictures but since I'm going to have to wrap them it probably doesn't matter. The first one on the drivers side sticks out a little more than I like but my steering shaft won't let me tighten it up any more. I'll get the primaries on the drivers side cut to length tomorrow. The drivers side was a little easier than I expected, mostly becaues I offset the engine to the passengers side a pretty fair amount. Looks like I may have to rethink my 5" ride height! I think I have about 12-14 hours into these right now and probably another 6 to 8 to complete. Quote Link to comment Share on other sites More sharing options...
mattd428 Posted July 17, 2013 Share Posted July 17, 2013 Looks good to me. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted July 18, 2013 Author Share Posted July 18, 2013 Thanks Matt, I got my wrap yesterday and should finish them this weekend. Management at work has had the nerve to have me do stuff for them so I haven't been able to tig out the drivers side this week, I'll probably just have to mig them at home. I'll take some pics once welded and after wrapping. The passengers side turned out to be pretty equal length at about 27" before the collector, the drivers side primaries ended up at 36" for the longest and 24" for the shortest. I probably could have made them equal length if wanted to get crazy with some additional bends but I've read that you only lose a couple hp for unequal length and the way I ran them I can use my stock brake lines I would like to build a set for someone with JCI mounts if there is someone local that wouldn't mind helping. All in all the kit was a pretty good start and I really didn't have much trouble adapting what was there to fit my Z. I probably have a leg up on most guys by being involved in the pipefitting trade for a long time but I think anyone with some welding and fabricating skills could build these. The biggest pita was holding the pieces and trying to measure or tack weld. Quote Link to comment Share on other sites More sharing options...
mattd428 Posted July 19, 2013 Share Posted July 19, 2013 I was getting a kick out of my boss at work trying to weld some exhaust on a salt flat car today. Was pretty entertaining with him shocking himself constantly damn tig welders. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted July 19, 2013 Author Share Posted July 19, 2013 Tig welding can be frustrating enough even when you're not getting shocked. Tell him to turn off the high frequency, or not Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted July 22, 2013 Author Share Posted July 22, 2013 My wrapping job is ugly enough to be a modern art masterpiece but it's all done but the itching (fiberglass). It's definetly a tight fit and I may have contact at the subframe on the passengers side, I had about a quarter inch before wrapping. It took me about an hour to put in 8 motor mount bolts and I'm pretty sure I can get the starter in. I still need to figure out what kind of exhaust flange to weld on to the collector reducer but I should be able to do that with the headers installed and I also forgot to layout the O2 bungs while I was building them so that will be another under the car weld. I'm probably around 25 hours and $300 for these. Quote Link to comment Share on other sites More sharing options...
CrayZ Posted July 22, 2013 Share Posted July 22, 2013 I'm jealous and wish you lived in houston. A set of long tubes is all that separates me from finishing my car. Looks great! Quote Link to comment Share on other sites More sharing options...
mattd428 Posted July 23, 2013 Share Posted July 23, 2013 Send your car up to my work crayz we will build you some headers. Looks good dave now get back to work. Quote Link to comment Share on other sites More sharing options...
CrayZ Posted July 23, 2013 Share Posted July 23, 2013 PM me a price matt Quote Link to comment Share on other sites More sharing options...
mattd428 Posted July 23, 2013 Share Posted July 23, 2013 If I wasnt going turbo I would be copying you right now. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted July 23, 2013 Author Share Posted July 23, 2013 Thanks Matt, last weekend was supposed to be an all out garage jam but between me being sick and my wife changing my plans I only managed a solid 10 hours. The speedway kit is a pretty good start, I think building them with a bunch of bends would have been harder. Having to work within what was supplied narrowed down the options and kept me moving towards finishing. Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted August 13, 2013 Author Share Posted August 13, 2013 (edited) Does anyone have any thoughts on O2 sensor placement for longtube headers? I've heard 4 times the primary diameter is a good rule of thumb. Edited August 13, 2013 by Naptown Dave Quote Link to comment Share on other sites More sharing options...
mattd428 Posted August 13, 2013 Share Posted August 13, 2013 (edited) As long as yours are Id say as close to the front of the collector as possible. Too far away and they wont read properly or at all. Edited August 13, 2013 by mattd428 Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted August 13, 2013 Author Share Posted August 13, 2013 Do you think that would give an average reading of all 4 cylinders per side? Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted August 13, 2013 Author Share Posted August 13, 2013 I knew I should have taken physics in high school! They probably had a whole section on mixing variables of hot expanding gasses. Lol Quote Link to comment Share on other sites More sharing options...
Domzs Posted August 13, 2013 Share Posted August 13, 2013 Headers look great . Place your O2 bung about 6" to 8" after the collector . So you have to remove the motor to get the headers off ? And what about starter replacement , header comes off ? Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted August 13, 2013 Author Share Posted August 13, 2013 I got real scientific with it and put them where the collectors merge, mostly because that's as far forward as my drill and hole saw would fit Quote Link to comment Share on other sites More sharing options...
Naptown Dave Posted August 13, 2013 Author Share Posted August 13, 2013 Yeah dom I have to pull the engine to remove the headers and have to unbolt the headers to fit the starter in. Good times Quote Link to comment Share on other sites More sharing options...
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