Understanding Timing

[Monsterbishi]

ok, following a discussion regarding the meaning of TDC,BTDC, etc, I have a question regarding my timing, when we checked it last weekend, it was set to 0 degree's (Green dot in my picture) on the balancer. Now it was originally my understanding that this meant the timing was retarded 10 degree's from stock, since the car rolled up a whopping 137.5hp on our local Dyno. I re-set the timing to 10 degree's (red dot) and the car has got a lot stronger, surely this wouldn't be the case if I was actually retarding the timing?

Or am I all back to front with my understanding of TDC and BTDC?

 

[Synned]

Its supposed to be 10* BTDC? Whats the problem? The red dot is correct, judging from the pic.

 

[Monsterbishi]

Well, it was originally set at 0 degree's - shouldn't that have made the car quicker since it was advancing 10 degree's beyond where it should have been?

 

[HISSIN50]

Double check your perceived definition of ATDC and BTDC - I think you might have misunderstood.

Your red dot advanced the timing from 0.

 

[wytstang]

You retarded your timing to 0 not advanced it.

 

[88stangnut]

Now my ? is... where do you set that 10 mark to?? Theres like a little bracket that goes over the balancer... Where do i set it?

 

[SeventyMach1]

Now my ? is... where do you set that 10 mark to?? Theres like a little bracket that goes over the balancer... Where do i set it?

There.

You can't see it in the pic, but I think that line (which is not present on my car) is centered on a point. The metal forms a point there. Use that point.





Monsterbishi, you're timing was "retarded 10*" when it was set at 0*. It is now at 10* BTDC (stock) ... so you advanced it 10* from where it was. My car was like this a little while back, too. Now it feels like a totally different car.

 

[blksn955.o]

like said the 10* red dot is adv. from the 0. 10* is the stock timing btw.

Bumping my stock timing to 14-15* was worth 3-4tenths in the 1/4 over teh stock 10*