Timing question

[91Bomb]

I just swapped my CAS and was wondering about a few things..

Chilton says before install to line up the thing that moves in the cas with a mark that's in there. Is that necessary since you're going to be moving CAS when you set timing so it's going to move off that mark anyway? Reason I'm asking is because I didn't check to see if it was lined up before I put it back on but after setting timing car seems to idle good.

Chilton says set timing 5 degrees tdc. Is that where a free modded 1g turbo guy running about 15 lbs boost wants to be ? Is 5 dtdc where you'll get the smoothest running engine though?

Which cylinder is # 1? When you open the hood is it the one all the way on the left or right? Somehow I forgot so I put the timing gun on each one and it looked to me like timing was the same on 1 and 4. Is that possible?

 

[92AWDHX40]

http://www.dsmtuners.com/forums/newbie-forum/354891-adjusting-timing-cas.html

 

[bryanwheat]

The reason that you are lining up the marks on the cas is so that you install it in the right orientation. It can go in 2 different ways. you need to set the engine to tdc with the dowels on the cam gears pointing up. From there install the cam angle sensor with the marks lined up. Next you can ground the timing connector on the firewall and set the base timing.

 

[91Bomb]

The reason that you are lining up the marks on the cas is so that you install it in the right orientation. It can go in 2 different ways. you need to set the engine to tdc with the dowels on the cam gears pointing up. From there install the cam angle sensor with the marks lined up. Next you can ground the timing connector on the firewall and set the base timing.

Little bit confused. I thought all you need to do is install CAS leaving bolts loose, start car, put timing light connector on spark plug wire #1, point timing light on crankshaft pulley, and move cas until you see 5 DTDC? That's the only way I've ever done it.

 

[WES_393]

Chilton says set timing 5 degrees tdc. Is that where a free modded 1g turbo guy running about 15 lbs boost wants to be ? Is 5 dtdc where you'll get the smoothest running engine though?

Yes, 5* BTDC is what you want base timing to be. This is not the constant timing, it's just the "default" amount of timing. The ECU has final control of actual timing.

Which cylinder is # 1? When you open the hood is it the one all the way on the left or right? Somehow I forgot so I put the timing gun on each one and it looked to me like timing was the same on 1 and 4. Is that possible?

Cylinder 1 is closest to the timing belt. DSM's use what's called a Waste Spark Ignition which means cylinder 1&4 fire together and 2&3 fire together. This simplifies the ignition system as well as reducing emissions. So yes, it's possible and completely normal.

 

[bryanwheat]

Little bit confused. I thought all you need to do is install CAS leaving bolts loose, start car, put timing light connector on spark plug wire #1, point timing light on crankshaft pulley, and move cas until you see 5 DTDC? That's the only way I've ever done it.

You have to verify that the cam sensor is installed in the right orientation. It can be installed 180 degrees out if you don't and the car won't run like that.

 

[92AWDHX40]

http://www.dsmtuners.com/forums/electrical-tech/394020-how-test-1g-cas.html

make sure its lined up with the notch.

 

[91Bomb]

Yes, 5* BTDC is what you want base timing to be. This is not the constant timing, it's just the "default" amount of timing. The ECU has final control of actual timing.

Are you saying where you set base timing makes absolutely no difference for driving since ecu has final control? Just wondering because my car seems a hair slower (since resetting timing) excellerating WOT in 4th + 5th gear pulls at 50+ mph

 

[bryanwheat]

Are you saying where you set base timing makes absolutely no difference for driving since ecu has final control? Just wondering because my car seems a hair slower (since resetting timing) excellerating WOT in 4th + 5th gear pulls at 50+ mph

No, he is saying that you must set the base timing to 5 degrees btdc because the ecu controls the timing assuming that the base is set to 5. If you don't set it to 5 than the ecu will assume that it is at 5 and you can end up with too much or not enough timing.

 

[91Bomb]

No, he is saying that you must set the base timing to 5 degrees btdc because the ecu controls the timing assuming that the base is set to 5. If you don't set it to 5 than the ecu will assume that it is at 5 and you can end up with too much or not enough timing.

I didn't get that from what he said in his post but I hear what you're saying right now..

So maybe before I set timing correctly at 5 degrees btdc it was either ?advanced or retarded? a bit and explains why car felt slightly stronger on WOT pulls than it does now?