so ive done almost every bolt on so far besides FI, headers, under drive pulley, ported intake manifold, test pipes to a full exhaust. Was starting to research the idea of upgrading my cams before i got my tune. ive found some cams that arent over the top 10.8mm or 10.2mm. with stock being 9.2mm. at what point do i need to start diving into the valve train? should i just go into the valve train while im there....

any help would be great.



---03 350z Touring Edition

 

my initial thought - if youre going to take the car past 6500rpm regularly and for long/longer/long'ish periods of time than I'd look into it.

My after thought - if youre doing cams and have already invested this much time and money into the car than do the valve train while youre there. Maybe pass on cutting the valves any bigger but consider valves, bronze valve guides/seals, upgraded springs/retainers.

All these will go well with FI down the road if you choose to go that route!

 

Have you not already had the car tuned ?

I have JWT C8's on my DE (12.01mm lift), doesn't require head-work but does require you use their springs of course.
Plenty of posts in this section of the forum, read and read and read a bit more.

Check this:
http://jimwolftechnology.com/wolfpdf...INCL_REVUP.pdf

One thing I'd say.
Figure out what you want from using the car (track driving, racing, back roads etc), and select exactly the right cam for the job and build the rest of the engine around that.
JWT have been excellent for me, especially in regards to communication. It's worth asking people that make the cams once you know what you're trying to achieve.

 

Could you drop in Revup valve train?
valve and retainers?

 

all good points

I, too, run JWT C2s (10mm lift) and like them.

Also, what are you tuning with? Might be wise to match your cam selection to the ability of your tuning software - meaning if your tuning platform cannot tune variable valve timing it may not be as big of a benefit.

 

I have the Tomei 264s with stock valve springs and they work good for my current setup. There wont be much difference between equivalent Jwt and Tomei cams...jwt cams will make a touch more midrange and the tomei will make a touch more top end.

6600rpm limit- 25x duration cam
7-7200rpm limit(stock de max)- 26x duration cam
7200-8000rpm(upgraded rods and oil pump)- 27x duration cam

This is assuming all the supporting mods are already done. I don’t think the factory style intake manifold will effectively support more than a 272 cam without serious mods regardless of how high you rev.

Also, I dont think there is any benefit to titanium retainers as the stock forged aluminum retainers are lighter. Basically pick your cam and run the manufacturer recommended valve springs. You are likely going to need to change or move valve buckets around to chase the proper clearances, so if you have the funds, look into the DLC coated HR retainers for less friction.

 

The valves and retainers are the same. The only difference is the springs are slightly stiffer (not enough to be worth swapping). The HR valve springs would make a decent upgrade for a smaller cam. It was rumoured that they are identical to the Nismo valve springs.