Lockjaw Posted July 24, 2002 Share Posted July 24, 2002 I was talking with Clark at JWT the other day and they have completed work on a turbo cam for the L series 6. It was completely computer modeled, and they cleared up all the harmonics issue's, and it is ground on a billet that is slightly harder than the stock billets.They put a lot of R&D into it. They also have a single valve spring that will control the valves up to 7500 rpms, and you have to do some retainer work, or buy retainers from them. The springs and retainers are around 120, and the cam is 600 bucks. It has 256 degree's duration at the way the Japanese measure the cam, and around .480 lift. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 24, 2002 Share Posted July 24, 2002 That sounds like a pretty good cam. I'm all ears if someone wants to fork over the $$ and evaluate it In short order, I intend to re-install my P90 with the 270/280 Schneider cam - that has about the same lift, and I love the way it pulls...is the 256 duration on the JWT at .050" lash? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted July 24, 2002 Share Posted July 24, 2002 That sounds like a great cam, its about time! I'm all for it in the future when I can afford one, I'd want to get some positive reinforcement from somebody who has already tried one... -980mak Quote Link to comment Share on other sites More sharing options...
SHANE Posted July 24, 2002 Share Posted July 24, 2002 nathan, where did you get your rockers and for how much? shane Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 24, 2002 Share Posted July 24, 2002 Hey Shane - The guy who built my head bought the rockers for me, not sure where, but they set me back a bit. Try $18 each (thanks, may I have another?) I think that's the right number (I can check my old receipt - Brian Schillinger built the head) Quote Link to comment Share on other sites More sharing options...
yo2001 Posted July 25, 2002 Share Posted July 25, 2002 I think I got 12 single ones (not a set)from MSA for $12 or something. Still expensive. I'm going to balance them when I take the head off. Quote Link to comment Share on other sites More sharing options...
Kennysgreen280zt Posted July 25, 2002 Share Posted July 25, 2002 I had my rockers re sufaced at Delta Camshaft , I think it was like $2-3 a piece. They have been a great company to deal with , my dad and I have had maybe 10 cams including some really wierd 30's era cars (pierce arrows , packards that sorta thing) here is thier web site Delta Camshaft EDIT~ JUN also makes cams for L series motors , cant remember what wierd catalog I was looking in for that one...... Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted July 25, 2002 Author Share Posted July 25, 2002 I am not exactly sure about the duration. I seem to remember Clark saying something about 5 thousandths, so I would say that the duration is at 50 thousandths would be somewhere around 210-218. Just a guess. That Scheider cam, if it is NA is one I tried in a turbo car since I had one, and it ran like junk. I knew Jun had a turbo cam, and so does Gude and Schneider. What I think sets apart the JWT cam is all the R&D they put into the design of the cam and fixing the harmonics. They also cut a head apart and took measurements and all sorts of technical stuff that is over my head. Suffice to say, I would bet money it is the best thing out there. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted July 25, 2002 Share Posted July 25, 2002 Originally posted by Lockjaw:I am not exactly sure about the duration. I seem to remember Clark saying something about 5 thousandths, so I would say that the duration is at 50 thousandths would be somewhere around 210-218. Just a guess. That Scheider cam, if it is NA is one I tried in a turbo car since I had one, and it ran like junk. I knew Jun had a turbo cam, and so does Gude and Schneider. What I think sets apart the JWT cam is all the R&D they put into the design of the cam and fixing the harmonics. They also cut a head apart and took measurements and all sorts of technical stuff that is over my head. Suffice to say, I would bet money it is the best thing out there. I'm looking at the spec sheet on the Schneider cam. It's definitely NOT an N/A cam, as it goes like a bat out of hell. I will hopefully get a better comparison, by swapping it and not modifying my boost level, and just run it at the strip again. The duration is 240/230 at 0.050", which is a bit more than the JWT. With this duration, at 0.050" this cam has -7* overlap, so obviously the ramp angles are fairly extreme. I don't doubt the JWT cam will be good, especially if they start with a new billet, instead of a regrind (like mine). Quote Link to comment Share on other sites More sharing options...
DAW Posted July 25, 2002 Share Posted July 25, 2002 Nathan, with your regrind do you recall what lash pads you needed to put in? I'm thinking the stock lash pads are usually .160". I was wondering if the difference with a regrind is anywhere close to the difference in length between 280Z L28 valves and 280ZX L28 valves. DAW Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted July 26, 2002 Author Share Posted July 26, 2002 Stock lash pads are 120 to 133. Not sure, Clark and I were debating that the other day when he was telling me about the cam. I am happy to hear your Schneider is not the NA cam. As I said, I tried their split profile NA cam in a turbo engine for fun, and it ran like dookey. What I found interesting, is that these cams most people grind are copies of an original design, from the 60's. While I am sure they have computer modeled their cnc machines, technology has improved so much with computers and everything, that the new grind JWT has must really rock. I know from reading articles about stuff that run their cams, nothing makes more power than the JWT cams in a Nissan that I can recall. OF course the 600 dollar entrance fee is kind of steep. Anyway, would like to hear the results of your testing with the Schneider once you get it installed. I may have some news to report in that area myself once I get my turbo fixed. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted July 26, 2002 Share Posted July 26, 2002 3mm is the stock lash pads. You guys do the math Quote Link to comment Share on other sites More sharing options...
Guest Tom Scala Posted July 27, 2002 Share Posted July 27, 2002 When all is said and done you're gong to have about $1K in parts for a cam swap with this new JWT piece. I don't blame them for charging that much since they probably have many, many hours of R&D into the design. But to claim to people this is THE magic cam is misleading PR to say the least. If a company doesn't ask the minimum questions (compression,gearing,weight,rpm range,turbo size,cylinder head flow at what valve lift,intended use)and then tailor cam timing to your specs before selling you the cam, all you are getting is an off-the-shelf maybe. This may be the magic stick for the application that is was designed for but change any parameter and cam timing has to change too. If they had several diffent lobes for different applications it might be more believable. I'd hate to spend the time & money putting this thing in only to find it doesn't work for me and then have the seller blame me for not having the proper supporting equipment to get the most out of the part. It just sounds like more JWT propoganda to me. Quote Link to comment Share on other sites More sharing options...
TimZ Posted July 28, 2002 Share Posted July 28, 2002 Originally posted by Tom Scala: I'd hate to spend the time & money putting this thing in only to find it doesn't work for me and then have the seller blame me for not having the proper supporting equipment to get the most out of the part. It just sounds like more JWT propoganda to me. I was just thinking the same thing, Tom... Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted July 29, 2002 Author Share Posted July 29, 2002 I don't think any one ever made the claim that the JWT cam was the "magic stick". They also have cam levels or stages on alot of their other cams stating what works with them, etc. I agree a grand is a lot of money to throw down for a cam for a turbo car that may not add as much hp as spending a grand upgrading a turbo, but it is a bigger than stock cam, and I have found I would like some extra powerband, and the stock cam is just not giving me that. I guess it just depends on what you want. I just wanted to put the word out there and let everyone know it was available. Since I have a JWT ecu setup on my ZX, Clark knows if the cam would work for me. Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted July 30, 2002 Share Posted July 30, 2002 I like the sport 450(hp) kit that uses the whimpy turbo and 420cc injectors. I can't respect a companies intent when they sell programmed ECUs through the mail thinking they will properly work. 90% of people I have heard use them have nothing but problems. You CANNOT create a fuel map for a specific car without the car in front of you! Most of the time the car runs lean and the drivability sucks. By the time you are done waiting for them to remap the ECU you could have just purchased an aftermarket fuel management system. Sorry, those are just the facts. Oh well, I'll take 3 JWT cams please! Quote Link to comment Share on other sites More sharing options...
jeffp Posted August 1, 2002 Share Posted August 1, 2002 So JWT has a new Turbo cam A. Well let me tell you a little about this cam. I could be wrong, but it seems they have adopted a grind I designed and now are making a few bucks off of it. That really sucks. I built my engine a year or so ago, you can look on the zcar archive and find my posts still I think. But one thing I did when I built my engine was to design a cam grind for my engine. Now I talked with Clark about their cams and they had no cams for sale, but what they did have is some old racer brown billets and two grind specs from racer brown. I decided it was time for me to come up with a grind for the cylinder head as it was at Robello being built and they needed a cam and I told them I was going with a custom grind on my car. I had Elgin cams grind a cam for me and that was installed on my cylinder head. I got the car running and took it down to JWT for tuning. This process took quite a long time, about 8 months to finally get the car completed. In the process of all this, there was another guy there getting his car tuned, Mark, and it was a little different then my car, but basically the same build and more importantly the same turbo, and the same fuel management as my car. I called Dave at Robello for something one day and he imformed me the JWT had called him regarding my engine, because they were impressed with the Hp my engine at the boost levels they were running as compaired to Marks car. I thought that was interesting at the time and it made me laugh a little. I did run some numbers by Clark on my cam design and did not get to much of a response from him on his thoughts of how it would run. Now I find all of the sudden they have a new Turbo cam grind, and I read all of your posts and it sounds like you are describing my cam. So if you want to know the exact grind of the cam here you go. All measurements are taken @.015 thousands. Intake= 21 BTC closes= 65 After BDC Exhaust= 65 BDC closes= 21 After TDC Lift intake= .485 Lift Exhaust= .485 Lobe center= intake 112 degrees Lobe center= exhaust 112 degrees Duration= 266 degrees (do the math for the lobe degrees) Overlap= 42 degrees Does that sound like what they have come up with to you?????? Sure as hell sounds like it to me. You want to see how the cam works in the engine, take a look at my web page at the dyno thumb and you will see just what this cam does. This really Pisses me off, but I got a little surprise for them, this was my proto cam grind, just to get me in the ball park of what I need to do to go to the next step with this cam grind, and believe me the final grind will be much more refined then this grind, and nobody will steal that grind, because I will have a patent on the specs. No wonder it took so damn long to get my car tuned, they were taking my design ideas and now they are making money to the tune of 600.00 bucks per cam for my investment and MY time. They may have come up with a modified ramp on the lobes to inhibit resonation in the cam, but you know what, that is what Sunbelt did with the head earlier then JWT did, and that is why I was planning on having Sunbelt do my final build, so they could flow match each cylinder and grind my cam to remove the resonance. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted August 1, 2002 Author Share Posted August 1, 2002 Jeff it sounds like your story has some merit, and maybe you should grind some cams and sell them. I don't know if the spec's are exactly the same, and I am no expert on cams, but 42 degree's of overlap on a turbo cam? That seems like a lot to me. If they stole your design, I think that sucks. I recall the recer brown story also, because I asked about a turbo cam several years ago. As for JWT, the only person I deal with out there is Clark. I have a nice relationship with him, and he has always been more than helpful with things I have asked about, beyond the ECU I got. James, I agree with you that a stand alone is a better way to go. Since I have never driven/riden in a car with a stand alone, I have no info to even make a conclusion about them. I know my set-up runs much better than the stock ZX fuel injection that came on the turboZX. The money I spent on my set up would have covered the cost of a stand alone, but I did not have a laptop, so that put that out of my reach at the time. It may not be the best way to go, but I made 307hp to the rear wheels on a stock motor with forged pistons, and T04b hybrid. I did not do any tuning on the car, just went down and dyno'd it. I am certain it is capable of more than that with a more efficient turbo, which is next on the list. Yeah it is not 400+ like you and TimZ put down, but I don't have a big T series turbo or 2 16G's. I think my car run's pretty strong for a fully loaded ZX, and feel quite certain it would have run a 12.5 or so thru the 1/4 mile with a few runs at night. I didn't and still don't have the money to spend on my toys like some of you guys, so I make due with what I have. I am sure one day I will have a stand alone, but until then, I will be using the JWT set-up. Jeff I would be interested in more info on the final design of your cam when you get there. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted August 1, 2002 Share Posted August 1, 2002 The overlap Jeff mentioned is at 0.015", which looks similar to my cam. By the time that overlap is transferred to 0.050" valve lift, there is no overlap. His cam grind is milder than mine in terms of overlap, but it has a bit more lift. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted August 2, 2002 Author Share Posted August 2, 2002 Which one do you have, the Schneider? What do you think about 218 degree's at .050 and .428 lift with negative overlap and 110 degree lobe centers? Quote Link to comment Share on other sites More sharing options...
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