A&Q about 350Z
Q:
i have a 1986 golf gti 8v ev with a 276 cam fitted an was woundering if any one can tell me how far to advance the timeing to improve bottom end power
A:
It's really an exercise for a rolling road set up. Try advancing a couple of degrees at a time from the recommended setting (which would probably be 110 or 108 degrees). A setting of 106 or 104 would probably do the job. Though it's more than likely ok, piston to valve clearance should be check after each adjustment before starting the engine.
A:
is the setting of 106/104 degrees taken from tdc
A:
is the setting of 106/104 degrees taken from tdc
Yep, whatever setting you go for it's xxx degree's after tdc, which should be full lift on the inlet valve.
Start advancing by 2 degree's from whatever the recommended setting is for that cam and take a power curve at each setting to give you a picture of whats happening. I doubt you'll need to go more than 4 degree's past the recommended setting. Bear in mind, you dont always loose peak power when you advance or gain low end, you may get to a setting where low end and/or mid range comes up for no loss of the top end... thats the setting i'd go for, but only playing on the rollers will tell. Use a good rolling road man thats happy to fiddle around and has an interest in trying what you want.
A:
It's really an exercise for a rolling road set up. Try advancing a couple of degrees at a time from the recommended setting (which would probably be 110 or 108 degrees). A setting of 106 or 104 would probably do the job. Though it's more than likely ok, piston to valve clearance should be check after each adjustment before starting the engine.
Depends on the cam.
You need to find out where max lift on the cam is. Generally the optimum is around 110 deg if you move the timing to 108 or less it will move the power up the rev range. Most decent cams for road use, will not give any power gain below 108.
You may need a softer cam say a 272 or a 268 if you are looking for low end go.