Cam timing of Rb26

[Mik]

What is a good starting point for Inlet and exhaust camshaft timing on a GTR, when the aim is for good mid to top end power (say about 4500RPM to 8000RPM)?

At the moment, the car is running +2 degress on the inlet and -4 degrees on the exhaust.

[blind_elk]

At the moment, the car is running +2 degress on the inlet and -4 degrees on the exhaust.

AFAIK, that's about as good as you're going to get it.

[Amaru]

To save starting another thread, id also be interested to know, I have HKS GT2530's with stock camshafts and camgears. This week Tomei 260 in/ex camshafts are being put in and tomei cam gears. I have heard people say dont adjust the Tomei stuff as you wont get power, is this true? If not, whats the most common adjustment to bring boost on as early as possible and have nice low to mid range torque.

[Sydneykid]

To save starting another thread, id also be interested to know, I have HKS GT2530's with stock camshafts and camgears. This week Tomei 260 in/ex camshafts are being put in and tomei cam gears. I have heard people say dont adjust the Tomei stuff as you wont get power, is this true? If not, whats the most common adjustment to bring boost on as early as possible and have nice low to mid range torque.

The Tomei Poncams 256/260 in GTST's haven't needed timing adjustments in my vast personal experience of 2 cars. But the Tomei's in GTR's ALWAYS need adjusting. As someone else posted, advanced 2 degrees on the inlet and retard 4 degrees on the exhaust is a good place to start. :burnout:

[Mik]

The Tomei Poncams 256/260 in GTST's haven't needed timing adjustments in my vast personal experience of 2 cars.  But the Tomei's in GTR's ALWAYS need adjusting.  As someone else posted, advanced 2 degrees on the inlet and retard 4 degrees on the exhaust is a good place to start. :burnout:

SK, is +2 degrees IN and -4 degrees EX a good place to start for standard cams too?

[Sydneykid]

SK, is +2 degrees IN and -4 degrees EX a good place to start for standard cams too?

I usually start at zero, that's REAL zero after allowing for cambelt stretch plus any head and block machining. But I always head towards advancing the inlet and retarding the exhaust first. :burnout:

[Nismo 34]

Is that + 2 and - 4 actual crank degrees or notches on the cam pulleys ?

Thanks.

[Sydneykid]

Is that + 2 and - 4 actual crank degrees or notches on the cam pulleys ?

Thanks.

Depends on the brand of cam pulley. Easy to check, each tooth on the cam pulley is 15 degrees crankshaft. Just count the notches for one tooth. :wavey:

[discopotato03]

SK , does this also work for the 26/30 single turbo RB30 .

Thanks A .

[Sydneykid]

SK , does this also work for the 26/30 single turbo RB30 . 

Thanks  A .

Are we talking camshaft timing? If so, the +2 inlet -4 exhaust is a place to start if you are running standard cams. I have seen some different timing work better with large duration cams. I have a pair of Jun 272/280's with 10.5 mm lift going in my new RB31DET, so I will be most interested in where the timing ends up for best average power using those.

[DRIFTER]

just thought i'd do some thread reviving to see what people suggest these days?