Rb20 Tomei Procams 260deg 8.5 Mm Lift Lash Type

[RedDrifter]

I'm now in the market to cam upgrades for the R32's Rb20.

Current mods: GT-R Injectors , Bosch 040 Fuel Pump, Z32 AFM, Front Mount 300x600x76, HKS GT-RS Turbo (18-20 psi), re-tuned ecu etc.

I was intending to go with the Poncams 256 deg, 8.5 mm lift units but I am curious on the 260 deg , 8.5 mm lift lash type Procams and am wondering if they require the valve springs upgrade.

Going on the tomei specs they are the same as the Poncams other than the extra 4 deg duration?

What is it that effects the valve springs the most duration or lift or is it a combination of both?

Cams are a new thing for me so I need the advice from others with this one.

Thanks guys.

Edited October 14, 2010 by RedDrifter

[Roy]

You mostly need valve springs when you start messing with larger lift. The ProCams have a sharper ramp as they have to be used with solid lifters. I have a set of 256s Poncams and 260/10.25mm Procams with solid lifter conversion and springs. The Poncams cost about $800, where as the Procams are $800, $500 for springs and $600 for the solid lifters....so far, far more expensive an option. But I am curious to see what the lift will do

[AD4M]

no valve spring upgrade needed up until you go solid lift cams like Roy said

I had HKS 9mm 264 cams in my rb20 but if I was to do it again I would use camtech 264's 9mm lift

http://www.camtechcams.com.au/niss_6cyl_rb20rb25nonvct.html

[RedDrifter]

no valve spring upgrade needed up until you go solid lift cams like Roy said

I had HKS 9mm 264 cams in my rb20 but if I was to do it again I would use camtech 264's 9mm lift

http://www.camtechcams.com.au/niss_6cyl_rb20rb25nonvct.html

I emailed these guys and they recommended the 426b set. I thought that the 268 deg was a little to aggressive for the GT-RS rear housing ,they recommended that I go valve springs and titanium retainers plus adjustable cam gears ,the costs involved to do all that it seemed not worth it. ( i guess the sales guys need to make cash)

Do you think the 264's would be over aggressive for the Turbo I use?

Edited October 15, 2010 by RedDrifter

[RedDrifter]

Guys thanks for your input.

At the end of the day I wish to use a set of cams that are a drop in replacement and are fairly well suited to the turbo set up i have.

I will go with cams at first and later down the track when I free up a little more cash I will go with Adj cam gears as well.

What do you all recommend?

Edited October 15, 2010 by RedDrifter

[GTScotT]

I will go with cams at first and later down the track when I free up a little more cash I will go with Adj cam gears as well.

That sounds like a plan mate, tomei poncams are well known for being excellent drop in cams. Even without gears.

Many people have said using gears on the poncams did not gain anything as they were done so well out of the box.

Poncam + retune and smile.