Retarding Timing On Ex Gear Cheap Way

[Evasion]

Hi

Putting this up for mate, I know a few people on here have put exhaust cam gears on their cars with stock cams and retarded/advanced the timing a bit for good results.

Now is this possible to do with out using a ex gear, motor in question is a rb25det.

Can he just go one tooth backward or forward as opposed to stock, He said to me tooth but I myself not 100% what the timing belt section up there looks like as im a timing chain person.

Any info people can shed with results they have experienced and maybe some theory behind why a certain setup works well would be greatly appreciated.

Thanks

[djr81]

From memory the gear has 48 teeth or there abouts. Which gives you 7.5 degrees change in timing. Which is too much for a good result.

If you are handy with the tools, you can make up something like the attached. Works & is cheap. Just not pretty.

Edited July 13, 2006 by djr81

[Evasion]

Ah k, no worries thanks

Roughly how much timing are people adjusting 2-3 degress?

and is advanced or retarded,

So its basically better to leave it where it is then to move that 7 degrees off

[The Dan]

Ah k, no worries thanks

Roughly how much timing are people adjusting 2-3 degress?

and is advanced or retarded,

So its basically better to leave it where it is then to move that 7 degrees off

2-4 degrees retarded is usually the case but these things are best set up on a dyno. JHH engineering can make your standard cam gear into a vernier set for $170.

[Evasion]

Excellant thats all the info I needed

Thanks