ejin4499 Posted September 8, 2010 Share Posted September 8, 2010 I'm planning my projects for my 1990 5spd. autozone special. I was thinking I would get a new cam and rebuild the engine (178000 mls) my main question is if I am stuck with a stock exhast manifold will I get any improvement from that new cam or will the backpressure in the manifold negate any gains from the cam. As I understand it without having a good exhaust useing a performance cam can cause problems The other question is does anyone know for sure if A. There are any doug thorley headers out there left? B. would they work on my pathy C. Any other viable options for headers? Thank you oh pathfinder gods for assisting this lowly newbie. Link to comment Share on other sites More sharing options...
Precise1 Posted September 8, 2010 Share Posted September 8, 2010 Hey Bud, I'm just over the hill from you in Santa Rosa!! Ok, first off, SEARCH!!! Now that we have that covered, cams are good, headers are good but cams and headers are better. Thorley resumed production of the WD21 headers, I have a set that I put on about a year ago and they fit/work quite well. Pace Setters are another option but are generally considered lower quality, painted not coated and there are mixed reviews of installment issues. They are also quite a bit cheaper... http://www.nissanpathfinders.net/forum/index.php?showtopic=27455 Also, the cams may be an issue if you have to smog the vehicle and unless you have the ECU reprogrammed, you wont get much more out of one than a stage 1, or 1 step up from stock so no point going further. B Link to comment Share on other sites More sharing options...
Kingman Posted September 8, 2010 Share Posted September 8, 2010 There's a general rule, to upgrade sucking in you must, in turn, upgrade breathing out. A cold air intake won't benefit much unless you've got the exhaust system to go with it, and visa versa. Link to comment Share on other sites More sharing options...
MY1PATH Posted September 8, 2010 Share Posted September 8, 2010 (edited) the eurospec cams (available thru our nissan reps here), and the schneider 256H grind should both pass emissions and possibly improve your high rpm score. I do not have certified test results but there is science involved.... They will also both do well with stock exhaust, but even better with headers and such. Edited September 8, 2010 by MY1PATH Link to comment Share on other sites More sharing options...
ejin4499 Posted September 8, 2010 Author Share Posted September 8, 2010 Hey Bud, I'm just over the hill from you in Santa Rosa!! Ok, first off, SEARCH!!! Now that we have that covered, cams are good, headers are good but cams and headers are better. Thorley resumed production of the WD21 headers, I have a set that I put on about a year ago and they fit/work quite well. Pace Setters are another option but are generally considered lower quality, painted not coated and there are mixed reviews of installment issues. They are also quite a bit cheaper... http://www.nissanpathfinders.net/forum/index.php?showtopic=27455 Also, the cams may be an issue if you have to smog the vehicle and unless you have the ECU reprogrammed, you wont get much more out of one than a stage 1, or 1 step up from stock so no point going further. B Hows the weather over there? Thorley discontinued production again on those headers and are not commiting to a date to resume. I am going to get there list of vendors that they last shipped to today and start calling. If all I can get are the pacsetters then so be it, but man I have read some horror stories about not fitting or craking after only a few years of service. Ultimatly my idea was to put one of the JWT ( part numbers AZ314-000S1 or AZ314-000S2) cams along with there upgraded ecu (ED210-NMC60). exhaust it all through some thorleys and figure out a decent high flow cat and muffler. Im not sure it would smog at that point I still need to do more research. I just got the pathy a couple months ago and just got it running good and smooth this month. Seafoam is king Link to comment Share on other sites More sharing options...
MY1PATH Posted September 8, 2010 Share Posted September 8, 2010 I have a feeling both JWT cams will give you trouble with your idle scores for emissions. (especially the S2) Link to comment Share on other sites More sharing options...
ejin4499 Posted September 8, 2010 Author Share Posted September 8, 2010 (edited) I have a feeling both JWT cams will give you trouble with your idle scores for emissions. (especially the S2) Is there anything specific that makes you feel that way? I'm kinda new to all the aftermarket stuff and looking to learn as much as possible. So far I haven't found out what the math is to figure out what the cam would do to my emissions. If you have a website I should check out I would be very grateful. Any thoughts on the nissan #2 cam? Edited September 8, 2010 by ejin4499 Link to comment Share on other sites More sharing options...
MY1PATH Posted September 8, 2010 Share Posted September 8, 2010 Without getting too much into the science, the basics of it are that they draw in more air which ads more fuel and thus produces more exhaust. Ad Idle It would be like testing a bigger engine.(something completley differant happens at higher rpms) now on top of that the S1 and more so the S2 have more overlap in their valve openings these can create other conditons that your stock emissions system may not be able to compensate for. not to mention the s2 creates a very rough sounding Idle and the smog people may be skeptical of that as well. If all your smog equip is up to par you might pass with the s1, I'm just saying I have a feeing it will give you some trouble. I don't think my new cam will pass me emissions either at least not untill I figure out how to get it to stop running rich Idle. (luckly I'm in a loophole). Link to comment Share on other sites More sharing options...
Precise1 Posted September 8, 2010 Share Posted September 8, 2010 Same as 30 miles away, I'm guessing... Thorley has done limited runs as long as I have had a Pathfinder. Some people get them in 2 weeks like me, and others wait 6 months. I got the Throleys here. http://www.rocky-road.com/ They were drop shipped direct from Thorley, so have the sales rep call check if there are any in stock. I went with a CARB legal magnaflow high flow cat and a Flowmaster Delta60 IIRC. Should all be smog legal, I'll find out here in a month or so. B Link to comment Share on other sites More sharing options...
Tungsten Posted September 9, 2010 Share Posted September 9, 2010 The Thorley ones WILL pass ANY state inspection. The inspectors thought those were factory exhaust manifolds that's how good Thorley makes their headers. Link to comment Share on other sites More sharing options...
beastpath Posted September 9, 2010 Share Posted September 9, 2010 the eurospec cams (available thru our nissan reps here), and the schneider 256H grind should both pass emissions and possibly improve your high rpm score. I do not have certified test results but there is science involved.... They will also both do well with stock exhaust, but even better with headers and such. those are pretty much the same grinds yes? Link to comment Share on other sites More sharing options...
SteeevO Posted September 9, 2010 Share Posted September 9, 2010 (edited) DT stopped production of the headers but I can have them make a minimum run of 20 sets if we get about 15 people wanting / needing a set. I talked to them about this earlier this week. Edited September 9, 2010 by SteeevO Link to comment Share on other sites More sharing options...
beastpath Posted September 9, 2010 Share Posted September 9, 2010 DT stopped production of the headers but I can have them make a minimum run of 20 sets if we get about 15 people wanting / needing a set. I talked to them about this earlier this week. the fact everyone is stopping production of stuff for our trucks (ARB, DT) does not bode well for us. Link to comment Share on other sites More sharing options...
MY1PATH Posted September 9, 2010 Share Posted September 9, 2010 Any thoughts on the nissan #2 cam? yes, good luck finding one. The only nissan cam still available for the VG30/33 is the eurospec. those are pretty much the same grinds yes? the eurospec and the 256H are differant. the eurospec runs the same lift as stock with longer duration and more overlap for higer RPM performace. The low amount of lift results in near stock behavior in the low rpm range. Schneider 256H increases lift and duration and targets the 1500 and up range. Link to comment Share on other sites More sharing options...
ejin4499 Posted September 9, 2010 Author Share Posted September 9, 2010 DT stopped production of the headers but I can have them make a minimum run of 20 sets if we get about 15 people wanting / needing a set. I talked to them about this earlier this week. well count me in for at least one set. Link to comment Share on other sites More sharing options...
ejin4499 Posted September 21, 2010 Author Share Posted September 21, 2010 BWAHAHAHA The Nissan gods have smiled upon me. I have found a set of doug thorleys got them halfway installed and so far only broke 3 studs. Found the best way to get a stud out for us was to put a 24 inch extention on a drill, put a chuck on the extension, easy out on the chuck. then its just a straight shot through the wheel well. If we missed center on the stud we put a lefthand bit in and drilled the side of the off center hole till we crossed center then used a flat head screw driver and backed out the stud. Now I have a new problem the thorleys are 2.25 inches and my existing exhaust is only 2. I was thinking of just exhausting out infront of rear driverside wheel instead of trying to go over the rear axel. Any thoughts? thanks Link to comment Share on other sites More sharing options...
beastpath Posted September 21, 2010 Share Posted September 21, 2010 why wont they connect to your piping? mine did. Link to comment Share on other sites More sharing options...
ejin4499 Posted September 21, 2010 Author Share Posted September 21, 2010 why wont they connect to your piping? mine did. From what I understand if you have 2.25 coming out you want to continue 2.25 all the way through to preserve velocity and pressure. I am going to try and reuse the flowmaster muffler that is currently on there as it looks like they put a reducer on in it to get it to fit the 2 inch pipe but that was welded on and I'm not so good yet with a welder. Link to comment Share on other sites More sharing options...
MY1PATH Posted September 22, 2010 Share Posted September 22, 2010 the thorley 2.25 bolts to the stock 1.875" From there you can leave it stock and still benifit (irecomend at least swaping the cat) or you can re-pipe to 2" or 2.25" A smooth reducer to 2" will not harm your velocity. Just make sure whoever puts the reducer in does a clean job. Link to comment Share on other sites More sharing options...
ejin4499 Posted September 23, 2010 Author Share Posted September 23, 2010 the thorley 2.25 bolts to the stock 1.875" From there you can leave it stock and still benifit (irecomend at least swaping the cat) or you can re-pipe to 2" or 2.25" A smooth reducer to 2" will not harm your velocity. Just make sure whoever puts the reducer in does a clean job. sweet thanks for the info. Link to comment Share on other sites More sharing options...
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