Noz Posted March 2, 2012 Share Posted March 2, 2012 Guys, been doing some research on increased redline. From what I've seen you need stronger rod bolts and decent cam springs. Apart from that, the rod's should be the same as the TT's, so therefore they should be ok to 8k redline? No point in getting longer duration cams if the redline isn't increased to take advantage of it. Quote Link to comment Share on other sites More sharing options...
dude Posted March 2, 2012 Share Posted March 2, 2012 Guys, been doing some research on increased redline. From what I've seen you need stronger rod bolts and decent cam springs. Apart from that, the rod's should be the same as the TT's, so therefore they should be ok to 8k redline? No point in getting longer duration cams if the redline isn't increased to take advantage of it. Power falls off on stock cams way before the redline !!!! Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted March 2, 2012 Share Posted March 2, 2012 Indeed, there's no point revving that high with stock cams Quote Link to comment Share on other sites More sharing options...
Digsy Posted March 3, 2012 Share Posted March 3, 2012 I thought the rods were different between NA and TT? Don't the TTs have squirt jets? Not that its relevant for this discussion, though. You might need stronger valve springs. but it depends on what cam profile you end up running. It syou go for a significantly longer duration without much of an increase in lift then the valve accelerations might be low enough that you can get away with it (unless you get unlucky and hit a weird valve spring resonance problem). Quote Link to comment Share on other sites More sharing options...
Noz Posted March 3, 2012 Author Share Posted March 3, 2012 I thought id leave it general before i gave specifics. il be upgrading valve springs and retainers as standard. il have high duration and more lift i wont be running a higher rpm with stock cams. I thought the rods and crank were the same. il be swapping the pistons out anyway i was hoping with uprated rod bolts i could use stock rods. if there is any doubt whatsoever il bite the bullet and do it properly and buy lighter rods. I think i read somewhere chris wilson said the stock rods dont like seriously high rpm so thought id ask what the limits were. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 3, 2012 Share Posted March 3, 2012 I thought the rods were different between NA and TT? Don't the TTs have squirt jets? Not that its relevant for this discussion, though. You might need stronger valve springs. but it depends on what cam profile you end up running. It syou go for a significantly longer duration without much of an increase in lift then the valve accelerations might be low enough that you can get away with it (unless you get unlucky and hit a weird valve spring resonance problem). Rods are the same (exactly the same, part numbers and all). the oil squirters are in the block on a TT, fed from the main oil gallery. they are also in the block of N/A's I have modified to include them Cranks are the same, too, including part numbers. Quote Link to comment Share on other sites More sharing options...
Noz Posted March 3, 2012 Author Share Posted March 3, 2012 Opinons on high rpm with rods Chris? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 3, 2012 Share Posted March 3, 2012 Google piston speed and bore and stroke, and rod ratio. The 2JZ is not a good candidate for high revs, but some forged pistons and decent rod bolts, in a balanced engine, with a stock damper should be OK at 8000 for short bursts, although it'll knock it's life between rebuilds to hell. Why rev it when you can make power with boost though? Quote Link to comment Share on other sites More sharing options...
Noz Posted March 3, 2012 Author Share Posted March 3, 2012 I don't think I'll make 600bhp on stock NA cams, so looking at getting customs made. Would need a higher range to take advantage of the duration? Quote Link to comment Share on other sites More sharing options...
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