Cascade Crew

91RSVert · Posted: Tue Apr 22, 2014 3:42 am Post subject: suggested base timing

Finally got my neighbors camaro running. It has alot more motor then I am use to dealing with.

406ci
HSR
proline heads
.525/.540 224/230 112lsa 108icl I think??
headers
cloyes hex adjust chain which I think ended up getting set at 1 advance.
7730 ecm with custom chip.

I put base timing at 7deg to get it running, fill fluids and check items. Seemed like it wanted more. IIRC stock is 6? We never got a chance to check old timing due to damaged gear. What would some of you suggest?

Alphius · Posted: Tue Apr 22, 2014 6:00 am Post subject:

You have to set the base timing to what it is set to in the tune to get the correct total timing at WOT and under cruise. There's no way for us to tell you what the guy's chip is set for.

If you don't have access to the value in the tune or paperwork from the tuner with the base timing spec then it's safest to assume they left the initial advance setting stock. So look up base timing for the ECU's original year and engine and set it to that.

If you feel like experimenting, the best you can do is play around with it until you think it runs right. The tune could be arbitrarily set for any base timing number regardless of any other timing curve/max timing value. We have no way of knowing what it is set to even given all the engine specs in the world.

aaron_sK · Posted: Tue Apr 22, 2014 7:02 am Post subject:

Twilightoptics · Posted: Tue Apr 22, 2014 7:40 am Post subject:

What these guys said.

Put it at 6btdc. Put a dial back light on it. See what the timing is commanded idling warmed up from the ecm. Set you light to tgat number. If the light flashes on zero you know the base in the chip is 6. If not look and do the math. If its within 1-2deg id leave it alone.

Twilightoptics · Posted: Tue Apr 22, 2014 7:42 am Post subject:

Also thats not how you setup a cam. It needs to be degreed on the icl- intake centerline. Or you install it straight up marks pointinh at each other and hope. Cams have advance built in.if the gear is adjustable you damn well need to set it up properly and degree it. That could even be why you think it wants more timing.

91RSVert · Posted: Tue Apr 22, 2014 1:14 pm Post subject:

ok, makes sense. But there is no info on what it was before. He emailed the guy who setup the motor with many questions. He answered many of them, but this was not one of them.

The timing chain is what is adjustable. I didn't even know they made them. I tried setting it at 0, it came out to about 1.

I have it set at 7deg right now. Guess he needs to take it for a spin and see. I only have a basic timing light, nothing fancy.

aaron_sK · Posted: Tue Apr 22, 2014 2:45 pm Post subject:

I would find a new tuner if the guy wont even tell you what he speced for initial.

If you changed the cam you should have a new chip burned anyway. Speed density ftw. Cool

91RSVert · Posted: Tue Apr 22, 2014 6:06 pm Post subject:

He bought the car already built. The fact that the PO/builder answered any questions was more then I expected.

I told him new cam=new chip. He has the equipment, just doesn't fully understand it.

Alphius · Posted: Sat Apr 26, 2014 7:14 am Post subject: