Advancing Timing On R33 Gts?

[D33J]

Gday guys I was wondring if any1 has advanced the timing on an rb25de, does the variable valve timing have any effect? will it make much difference? cheers

[R34GTFOUR]

Gday guys I was wondring if any1 has advanced the timing on an rb25de, does the variable valve timing have any effect? will it make much difference? cheers

i've done it on a few rb25de's and its a nice little improvement. For something that cost nothing but 5mins of your time its great

Just loosen the 3 10mm bolts holding the cas untill you can turn it. and turn it ANTI-CLOCKWISE, you'll notice the idle will jump up a few rpm. You dont need to take the bolts all the way out. If the rpm drops you are going the wrong way, ie dropping timing. If the idle is sitting too high afterwards, just adjust the idle screw a few turns, but you might not even need to touch the idle.

Mine is probably 2mm from being "maxed" out, since theres only so far you can turn it. My brothers on the other hand is fully clocked across haha...

Take it for a spin afterwards and listen out if it pings, if you can hear it pinging drop it back a notch and try again. The best time to check for ping is during the day when its warmer and under full load (ie 1500rpm in 2nd then floor it). You should be running 98 ron fuel normally, but if your arent, you definately should once you've increased the timing, otherwise you'll knock the engine to death. If you dont know what ping is or what it sounds like, get someone that does to go for a drive with you.

Like i said its free hp and you should notice an increase in fuel economy aswell, win win.

The rb25's dont have variable valve timing, but they do have variable cam timing, but bumping the ignition timing wont effect anything to do with it.

Edited December 24, 2008 by R34GTFOUR

[D33J]

i've done it on a few rb25de's and its a nice little improvement. For something that cost nothing but 5mins of your time its great

Just loosen the 3 10mm bolts holding the cas untill you can turn it. and turn it ANTI-CLOCKWISE, you'll notice the idle will jump up a few rpm. You dont need to take the bolts all the way out. If the rpm drops you are going the wrong way, ie dropping timing. If the idle is sitting too high afterwards, just adjust the idle screw a few turns, but you might not even need to touch the idle.

Mine is probably 2mm from being "maxed" out, since theres only so far you can turn it. My brothers on the other hand is fully clocked across haha...

Take it for a spin afterwards and listen out if it pings, if you can hear it pinging drop it back a notch and try again. The best time to check for ping is during the day when its warmer and under full load (ie 1500rpm in 2nd then floor it). You should be running 98 ron fuel normally, but if your arent, you definately should once you've increased the timing, otherwise you'll knock the engine to death. If you dont know what ping is or what it sounds like, get someone that does to go for a drive with you.

Like i said its free hp and you should notice an increase in fuel economy aswell, win win.

The rb25's dont have variable valve timing, but they do have variable cam timing, but bumping the ignition timing wont effect anything to do with it.

thanks a heap man, just what i needed. btw cas = camshaft sensor? and where do u adjust the idle does t has an adjustable needle on the throttle body or sumthing? cheers

[JonnoHR31]

idle screw on the back of the plenum

[_bobo_]

can anyone show pics of where this is located. i have a 33gts series 2 rb25

[_bobo_]

can anyone tell me how to do this?? or find instructions or pics on what to do???