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Originally Posted by EuroPete
Using 10W-60 may be one of the reasons for the car not to run very fast until it reaches 2000-2500 RPM. I don't know how to explain, but if you hit the gas it doesn't accelerate progressively, it feels as if there were some kind of jamming or something. Maybe the ignition system is not working properly so I'm thinking about changing spark plugs, spark plug wires and even the distributor rotor.
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As far as torque below 2000 rpm goes, mine is "soft" there too. It builds quickly tho and as you noticed by 2500 rpm it starts pulling hard. Looking at torque curves for the LT5 seems to verify what I'm feeling in the seat of my pants too. I love the LT5, but it doesn't pull down low like my '95 LT1 did. (I noticed this right away as 6th gear below 2000 rpm is quite "doggy" for the LT5, whereas it was "OK" for the LT1.)
My point is, I don't think the oil has anything to do with the torque below 2000 or 2500 rpm for a couple reasons:
It has more to do with the design of the plenum, etc as to where the torque curve "kicks in".
The effects of high viscosity would be more prevalent at higher rpm than at the "off idle" speeds. So, way down low the effects would be much less severe.
As for changing the distributor cap and rotor on the LT5...it will be hard to do, as the ignition is 100% solid state. - A spark control module under the plenum handles most of the timing chores with inputs from crank position sensor.
As for Amsoil AMO (preferred by Marc Haibeck - one of the ZR-1 gurus), or Mobil 1, just say the word, and I or most others here would be happy to send ya a case, if your US contact can't be reached.
P.