Jump to content
SAU Community

Recommended Posts

My tuner just did some before and after pulls with HKS Vcam and shared on his Facebook.  I would like to share that here for those thinking about Vcam.

His car is still running on stock R32 turbos with steel turbine wheels.  The pulls were done on E60 ethanol mix.

https://www.facebook.com/houston.zauto/posts/1368728369930762

 

Edited by TXSquirrel
  • Like 1
  • Thanks 1
Link to comment
https://www.sau.com.au/forums/topic/475195-hks-vcam-before-and-after-on-r32/
Share on other sites

image002.jpg.f622681b2cabe2ce0325f1d96ad1733e.jpg

I extracted more info out of him, really hope he doesn't mind me posting this.  RPM across the top and load on the left.

Question for you folks about how camshaft degree translates into cam gear degree.  His HKS exhaust camshaft has a centerline of 110, and he gained across all RPM range by retarding his exhaust cam gear by 2 degrees.  My Tomei has a centerline of 115, to get the same effect how should I adjust my cam gear?

Yeah the difference from 3000 to 5000 rpm is astonishing.  My tuner made his pulls on stock R32 turbos, so with any decent aftermarket turbos the improvement should be more pronounced.  He has actually pushed hard on those stock turbos and intends to blow them up as he has a pair of 2530 waiting to go on, but they are surprisingly tough.

When you say on vs off, do you mean activated vs not activated? or optimal vs sitting at base conditions?


Its still a slightly misleading comparison as your off isn't going to be as optimized as a normal dumb cam. 
Still, I wants it.

 

  • 3 months later...
On ‎10‎/‎26‎/‎2018 at 1:26 PM, r32-25t said:

44D1F837-CFAD-4BE9-9F56-7CBFBF112A88.thumb.jpeg.6da56bba0d835cbf55f7c97858eab354.jpegthat is a difference with vcam turned on and off my car, this is a very conservative 98 tune before we swapped to e85

But look at all that top end power it lost! That 1.5kW is a huge price to pay... :10_wink: :4_joy:  

  • Haha 2
On 10/25/2018 at 11:55 PM, TXSquirrel said:

Question for you folks about how camshaft degree translates into cam gear degree.  His HKS exhaust camshaft has a centerline of 110, and he gained across all RPM range by retarding his exhaust cam gear by 2 degrees.  My Tomei has a centerline of 115, to get the same effect how should I adjust my cam gear?

Camshaft and gear degrees are identical.  2° is 2°.

That may not answer your question.  And the lesson learned by retarding the HKS cam by 2° may not be applicable to your cam.  Those sorts of changes really come down to what effect the change has on the overlap of the in and ex lobes.  As your centrelines are so different, then it is quite likely that the overall profiles of your cams are quite different and you may end up with a different result.  You might need more retard, or possibly less, or possibly gain from a little advance.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hi all. So one of my major issues at the moment is my rear turbo leaking oil on the exhaust (and the general area). I presumed it was the rock hard super old drain hose, which it was not. So now I am in the midst of removing the rear turbo to get access to the banjo bolt that goes into the turbo oil feed. As one of the previous owners accidentally? tore off the OEM oil feed hardline that reaches behind the turbo, they ran braided lines directly to the turbo, presumably PTFE. Now, regardless if the line has rubber or teflon inside, is it just generally a bad idea to do this? I imagine these lines get quite hot being between the engine, turbo core and exhaust manifold. I suppose it's not too far fetched to think the line may even have melted. I'd love to hear your opinions on this as as the replacement OEM hardline piece is 130 per unit. And cutting open the currently mounted line to see inside will mean I just have to get a replacement either way. So far I am hoping maybe the bolt just loosened or (god forbid) they forgot one of the crush washers.
    • If it's a factory 20de manual probably has the 6 bolt flywheel in which case the det clutches won't work as they're 9 bolt.
    • All RB push clutches are interchangeable. AFAIK, the 4cyl ones are not. Different flywheels. The RB small box is not identical to the 4cyl boxes. Just very similar.
    • Hi. I need a new clutch for my gearbox. It is a factory smallbox behind RB20DE NEO. What options do i have? If iam not mistaken the gearbox should be the same as in R32 GTST and Nissan S14/S15? I found some Xtreme Clutch Stage 1 for S14/S14 (i dont know if you know the brand) (UK) OR...is the clutch same as in the bigbox from RB25DET?   Thank you!  
    • Listening to an artist called "the flashbulb". Not bad. Makes some fairly well researched youtube vids in various things.
×
×
  • Create New...