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Cylinder Head & Short Block Cams, valvetrain, pistons, rods, stroker kits, swaps, etc. Advanced modification discussions only.

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Old 12-10-2005, 06:13 PM   #1 (permalink)
 
Registered: Nov 2005
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cam / engine timing/ aftermarket ecu

hello,
I had a set of cams installed today, when we fired the car up afterwards the timing was 17 degrees higher than the spark map in my Hydra ecu.
The mechanic checked cam position and it was correct. New to me is the idea that the engine timing is derived off the cam end.(?) The Hydra must be getting its timing from the crank sensor? So I either have a set of cams that is not "keyed" correctly for my car or the mechanic miss set the timing reader( ?)

as you can see I am over my head here, any clarifiers please.
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Old 12-10-2005, 08:48 PM   #2 (permalink)
 
Registered: Feb 2005
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I'm not too familiar with your hydra ecu, but i know on my AEM unit I'd only have to re-set the base timing when I use adjustable cam gears that are adjusted from factory specs on the evo since the CAS is non-adjustable unlike the 1g dsm's.

Are you using adjustable cam gears?
Which cams are you using?
Have you checked the literature that comes with the ecu to see if you need to re-set the timing in that unit?

I highly doubt that your cams were keyed improperly, it's more likely installer error, though you did say that you double checked all the timing marks after the cam install, correct? This is to say that you've made certain that the crank and oil sprockets match the cam marks with the dowels at 12 o clock right?
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Old 12-11-2005, 06:10 AM   #3 (permalink)
 
Registered: Nov 2005
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thanks for the input,
I did not personaly check the timing marks. I did ask the mechanic to.
These are stock centered lobed cams, with stock cam gears, set straight up.

Is it possible he keyed the cam sensor wrong, would that effect timing? That plus a bit off on the exhaust cam, is all I can come up with on how this could happen.

I guess it is common for timing light timing and emc timing to not be the same, how far off is normal, I do not know.
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Old 12-13-2005, 08:03 AM   #4 (permalink)
 
Registered: Feb 2005
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if the cam sensor was reinstalled improperly after the cams, it would either be 180 degrees off or in phase. no other possible way to do it.

My guess is that if it is installer error and not the ecu, which I'm not claiming is definately the case... then the cams are off a tooth. With the dowel pins on the cams at 12 o'clock, the marks on the cam gears should line up directly with the valve cover. This is easily checked by simply removing the upper timing belt cover and turning the engine either by the access hole through the fender liner or bumping the starter.

I think you need to check the mehanical side first, then read any literature that comes with the ecu as far as needing to set base timing and so forth.
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Old 12-13-2005, 11:17 AM   #5 (permalink)
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Quote:
Originally Posted by pezzonovante
... then the cams are off a tooth.
That's the only thing I can think of. Maybe the belt slipped during the install.
How's it running?



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Old 12-13-2005, 04:12 PM   #6 (permalink)
 
Registered: Nov 2005
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got the car back and it is fine, I think, the lap top took it's que and went dead right when I picked up the car
but the car runs better and there is no sign of over timing.

great shop by the way
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