<VV> Pinging turbo

[Dave Thompson]

Hi Guys,

 

Well, I just passed 500 miles on my new engine and after changing the oil &
filter, I started to get a little more aggressive in my driving. When
getting onto the freeway, I GENTLY ran it up to 3500 to 4000 RPM. As soon as
the boost gauge hit zero and above the engine started to ping. I immediately
let off the peddle. I tried several more times and always got pinging above
zero. I'm running 91 octane from a busy gas station so I know the fuel is
fresh. I have never gotten any pinging below zero boost. In my water-cooed
days, pinging was caused by poor timing (in most cases).

 

In my research I have learned that the turbo distributor has a pressure
retard. I looked up the part number and that's what I have, not vacuum
advance. The hose to the intake is new and tight (should there be clamps on
the hose?). I have the Pertronix Ignighter II and a new 0.6 ohm Flamethrower
II coil (no resister per instructions), new cap, rotor, plugs and wires.
Before the rebuild I could hardly get 3000 RPM so I have nothing to compare
it to.

 

With this info, I have a few questions:

 

Am I right about the timing being the culprit? If not, what else should I
check?

 

What is an easy way to test the pressure advance without purchasing
expensive tools? I don't want to purchase a new one only to find that the
one I have works.

 

Could I be having other distributor problems?

 

I had one guy say that turbos shouldn't use the Pertronix electronic
ignition. I should only use points. What are your opinions?

 

My buddy asked if the sound is not pinging but is the turbo spooling up. It
is a rhythmic or ticking sound. (I thought turbos had a whine)

 

Any input on this will be greatly appreciated.

 

Thanks,

 

Dave Thompson

63 convertible Spyder (clone with a 64 drive train)

Westminster, Ca