bigmikespec

No worries mate, I dont know about the slightly amusing part about it! Still no PM...

PM me.

Under the assumption that the external wastegate is vented to atmosphere your theory is incorrect.

Sorry mate you are wrong there on your first paragraph. Yes, you want response choose small turbos like HKS GT-SS or N1 upgrade (which means high exhaust manifold back pressure) and chosing short duration camshafts with little or no overlap.

Fair enough... was a bit cheeky though! I am a bit of a nerd especially when I don't know something, come hell or high water I want to know exactly what and how happens. To rob82 my comments were more to suggest that an internal wastegate creates more back pressure on the exhaust side. I also think you answered your own question as well... why would you have a large frame single turbo on a small capacity engine with small cams? Engine would choke before the turbocharger even came into its own.

Ryan give me a call man happy to discuss. I do my own research... I am disappointed you think that. Might just keep the information to myself in future.

Don't forget me Brad

There an echo in here?

It is funny how pople blindly believe what people tell them without any understanding as to why certains things occur. It is no magic Racepace trick that stock camshafts work well with small internal wastegate turbocharghers like any of the common low mount upgrades on a GTR. Exhaust manifold back pressure is significantly higher than boost pressure is most of these scenarios... big duration camshafts would cause reversion of the exhaust due to the pressure differential and overlap that the camshafts give. Thus very short duration camshafts are ideal for small (ish) low mount turbocharger upgrades because of the compromised turbine housings, internal wastegates, etc. On the other hand tubular single turbo manifolds with large external wastegate turbine housings create a much lower exhaust manifold back pressure. Once the ratio of exhaust manifold back pressure and boost pressure get close to 1:1 then is the time for big duration camshafts with appreciable overlap. What will occur is almost a scavenging of the exhaust ports as both inlet and exhaust valves are open at the same time; in short, with a sacrifice lower in the rpm range higher power is achievable and it will come on earlier as guys like Red R Racing have proved. I would be measuring exhaust manifold back pressure before choosing cams. Also, instead of people choosing small cams with the belief that it will bring on bigger turbochargers earlier they should be getting more head work, extrude honing OEM manifolds and get a decent twin 3" exhaust!

S300SX... for $900 cant go wrong.

Just build a twin charged engine and you will get higher boost pressure to turbine back pressure anyway... done!

What is happening Bobby? You still going with the Turbonetics turbo for this build?

PM sent

Just to add again this stuff looks so good. Even Seibon carbon parts use a fibreglass skeleton. This is top shelf!

Brad, check your emails dude! Here is some Daily Engineering magic to keep this thread moving: http://www.daileyengineering.com/vq_35.htm

Those doors are amazing! Any scope for R33 GTR parts?

Who is this mate you speak of???

If no one wants the "old tech" T517Z 10cms then throw them my way!

That is what an engineer at Auto Verdi told me.

Hard as they would go with stock head?

That would be a neat setup... the only reason I am thinking tank in boot is because the GTR is such a fat pig at the front I need to move as much weight to the back.

Do you have a set of baffles in the tank Brad? What capacity is the tank? Looking at the D.E. or Verdi pump with an air/oil separator the design of the tank can be a lot simpler which owes itself to a custom built tank that can be made to fit out of the way somewhere. As long as there a some baffles to slop the oil sloshing around then that is fine. Shoot me your details Brad via email and will get it sorted!

10/10 Brad, looks great buddy.

Is that for an RB25? That is a very common design... looks consistent with what I have seen; looks good.

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