Crouch Posted November 17, 2011 Share Posted November 17, 2011 I'm unsure of what lift mine are but they are 280's and i have 1000cc injectors. The idle when cold goes from trying to stall and the car shudering/rattling to 2500rpm ish, warm it idles as it should smooth at little under 1000rpm. The big thing with my cams (don't think its the turbos fault) is the power climbs and keeps doing so and feels like its still gaining power when the car runs out of revs!..it pulls harder and harder and then the shift light comes on despite still trying to surge forwards. Quote Link to comment Share on other sites More sharing options...
johnny g Posted November 17, 2011 Share Posted November 17, 2011 I'm unsure of what lift mine are but they are 280's and i have 1000cc injectors. The idle when cold goes from trying to stall and the car shudering/rattling to 2500rpm ish, warm it idles as it should smooth at little under 1000rpm. The big thing with my cams (don't think its the turbos fault) is the power climbs and keeps doing so and feels like its still gaining power when the car runs out of revs!..it pulls harder and harder and then the shift light comes on despite still trying to surge forwards. Yep, your turbo follows the cam profile. You might be better off going down to 269 or 272's, unless you want to build your bottom end for more revs? Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 17, 2011 Share Posted November 17, 2011 I'd like to know the answer to that myself actually! GSC stage 3 2jz cams are 290 duration 11.30mm peak lift. Quote Link to comment Share on other sites More sharing options...
Kris H Posted November 17, 2011 Share Posted November 17, 2011 GSC Power-Division's big and nasty cams for the 2JZ-GTE! Not for street use. 1000+ HP applications running anything from Methanol, NO2 or 45+psi. Call for more details. This is a serious cam for serious horsepower. S3 Specs gsc-6030S3 Intake 290 Duration 11.30mm peak lift Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 17, 2011 Share Posted November 17, 2011 Mine ticks over very nice with SRD 280 duration 9.9 lift cams. I like the SRD cams myself, they have been proven to work very well, cars with these cams seem to make good power for the turbo size, just look at Jamesy's car and mine, for the turbo size i cant think of any Supras in the uk close to our power. Been thinking about changing to some of the new lighter SRD billet cams with a custom profile at some point, now would have been a good time as my cams are out of the engine at present while Lee changes my car over to L19 exotic studs. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 17, 2011 Share Posted November 17, 2011 It's because the lifter buckets are quite a small diameter in the *JZ heads, so a high lift cam runs the peak of the lobe off the side of the bucket, which knackers both the cam lobe and the bucket up. On race engines , given room, you put in bigger diameter buckets to alleviate this problem. There's probably not a lot of meat in the head of a 2JZ to allow much bigger buckets, I have never really weighed one up with this in mind. Really big lift needs a finger follower design set up. Quote Link to comment Share on other sites More sharing options...
Jamesy Posted November 17, 2011 Share Posted November 17, 2011 Thise billet ones with custom profile would go nicely in yours J, especially while its going to be apart anyways! Bet your looking forward to trying out that new triple plate Quote Link to comment Share on other sites More sharing options...
Noz Posted November 17, 2011 Author Share Posted November 17, 2011 GSC Power-Division's big and nasty cams for the 2JZ-GTE! Not for street use. 1000+ HP applications running anything from Methanol, NO2 or 45+psi. Call for more details. This is a serious cam for serious horsepower. S3 Specs gsc-6030S3 Intake 290 Duration 11.30mm peak lift why not for street use? how is this going to affect the drivability. also can someone PLEASE answer my question: same duration with different amounts of lift, how does lift affect performance? Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 17, 2011 Share Posted November 17, 2011 (edited) why not for street use? how is this going to affect the drivability. also can someone PLEASE answer my question: same duration with different amounts of lift, how does lift affect performance? They dont class 1000+bhp as a street car, i do however. The higher the lift = the further the valve rises meaning more air, more air needs more fuel, both combined means more power. Edited November 17, 2011 by JamieP (see edit history) Quote Link to comment Share on other sites More sharing options...
Noz Posted November 17, 2011 Author Share Posted November 17, 2011 this will also mean more wear i assume? would anything else need to be upgraded to run say 10.3mm lift than springs and retainers? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 17, 2011 Share Posted November 17, 2011 http://www.jdmcars.com/tech/lift_duration.pdf Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 17, 2011 Share Posted November 17, 2011 ..... Just tried opening that link twice and both times my IE crashed. Quote Link to comment Share on other sites More sharing options...
johnny g Posted November 17, 2011 Share Posted November 17, 2011 Works ok for me on Firefox, folks. Quote Link to comment Share on other sites More sharing options...
JamieP Posted November 17, 2011 Share Posted November 17, 2011 this will also mean more wear i assume? would anything else need to be upgraded to run say 10.3mm lift than springs and retainers? Most likely. Depends on the power and revs you are going for i guess, If doing it i would and did go the with everything uprated in the valve train, mine has took a lot of abuse this year and Lee reported everything to look as new today so im happy. Quote Link to comment Share on other sites More sharing options...
Noz Posted November 17, 2011 Author Share Posted November 17, 2011 probably not far higher than stock rpm. stock is 6.8, so probably 7.2 and leave it there as the bhp increase wouldnt be worth the wear and tear on components i will be running. Quote Link to comment Share on other sites More sharing options...
johnny g Posted November 17, 2011 Share Posted November 17, 2011 Probably 256/264 regions would be ideal. Look at what Hodge achieved with 264's. Quote Link to comment Share on other sites More sharing options...
Noz Posted November 18, 2011 Author Share Posted November 18, 2011 what about some 312's? 10.4mm lift? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 18, 2011 Share Posted November 18, 2011 312 degrees duration is strictly race engine, and really a high revving N/A race engine at that. Car would be undriveable on the road, drink fuel with a microscopic power band. Quote Link to comment Share on other sites More sharing options...
Noz Posted November 18, 2011 Author Share Posted November 18, 2011 how do you think this would this perform on a standard NA, i assume such a high duration would cause the chamber to starve at low RPM (going on your document i read) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 18, 2011 Share Posted November 18, 2011 It's a totally unsuitable duration for a stock N/A, it's the sort of duration I run in a full race all steel 10,500 RPM Formula Atlantic 1600. Power is from 7,000 on. Quote Link to comment Share on other sites More sharing options...
Noz Posted November 18, 2011 Author Share Posted November 18, 2011 the cams will be installed after my turbo is fitted. id like to increase the rpm slightly but starting power at 7k would mean without a limit to 8k it would be pointless? Quote Link to comment Share on other sites More sharing options...
johnny g Posted November 18, 2011 Share Posted November 18, 2011 You'd also have to buy a T6 turbo to match. Seriously, get some 264-269-272 cams and your turbo of choice. Even the Whifbitz cars only have 280's - for a reason. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted November 18, 2011 Share Posted November 18, 2011 I wouldn't go over 280 degrees, less if it's mainly for road usage. Go high on lift and it becomes an interference engine, are you good at setting up twin cams? If not you could do expensive damage very easily. Quote Link to comment Share on other sites More sharing options...
Noz Posted November 18, 2011 Author Share Posted November 18, 2011 Ok make sense. So if keep the lift low but have a slightly longer duration. Say, 9.9mm lift and 300 duration, this would probably just run as well as 280 duration but choke the chamber more at low RPM, and without a seriously high RPM rev range I wouldnt see any improvement? Quote Link to comment Share on other sites More sharing options...
johnny g Posted November 18, 2011 Share Posted November 18, 2011 Unless you're going for an 8000rpm limit, I'd remove the thoughts of 280 and above from your mind 264 to 272 is where you need to be looking. Quote Link to comment Share on other sites More sharing options...
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