Thread: Timing, which one is correct?

I have a set of UR pullies, and I've also just received my ecutalk (ebay) cable - I've always wondered which run of pullies I have because the lines indicate I'm either at 15 or 17 degrees. My question is, regardless of what the pully states, is the calumsult software more correct than the pully? Reason I ask is the software states 15 degrees when warmed up/base timing mode, and I'm unsure if I should advance it the 2 degrees.

Any help would be appreciated

You're reading the timing that the computer "thinks" it is delivering. That can be completely off, and depends on you setting the timing correctly using the pulley.

The pulley is correct.

dang. I was hoping it was. Guess I'll never know which line is actually correct

You could take a piece of silly puddy, or clay or something and press it against the backing of your pulley (this is a GSpec pulley, right?) and then remove the silly puddy and the lettering on the back of the pulley should show up in the puddy. This way you can tell if you have a Version 2 pulley or not, and you can know which timing mark you need to use.

it's the unorthodox racing pully - same deal?

The guy who made the pulleys for Greg also made them for other companies. It wasn't explicitly stated, but it is very likely the unorthodox VE pulleys suffered from the same problem. I don't know if they ever got a version designation like Greg's did though, so I'm not sure what you'll be able to tell from the markings on it.

I have a new idea.

Put cylinder 1 at top dead center by any of a few methods. I'd probably take out the spark plug and put a wooden dowel down to rest on the top of cylinder 1 and turn the crank by hand until the cylinder reaches the top making use of the dowel follow it's movement. Once you are confident you have the engine at TDC, look at the timing marks on the pulley and see if the marker peg is pointing at 0 degrees exactly or if it's off some. This will let you know how far off your pulley is.

problem I see with that is, it's easy to be wrong by 5 degrees when rotating the crank because it will be at that 'transition' point on the piston ie, on it's way up, transition, on its way down. anywhere in that transition could be 5 degrees, no?

Is there a way to tell on the ur pullies what run date they were? early ones started at 0 degrees instead of -5, thus making one line either 15 or 20 lol

You have a point about getting the engine at TDC, it is tough.

I'm not familiar enough with the Unorthodox Racing pullyes to give you a good answer to that question. I know that by looking at the marks on the GSpec pulley (it starts at 0 degrees BTDC) you can tell that the first two marks are 5 degrees apart, then another 5 to the next mark, then 3 degrees to the next mark, then 2 degrees to the next, then 2 again, and finally another 2 to end up at 19 degrees BTDC.

You might be able to tell if yours starts at 0 or 5 just by looking at the marks and using a little power of deduction.