AFM measurement/backpressure (was Turbo speed sensor)

[nacelp]

The speed varies alot, meaning from barely moving to several hundred rpm.
On, some big stuff (436 CID, turbo set up for 60 PSI od boost), you often
can count it's vanes moving, by.  On a turbo buick is just fast enough at
times to blur.
Oil temp., EGT are what spins the turbo.
Grumpy


> Has anybody actually used an optical tacho to see what sort of rpm's
> the comp wheel does at idle ? And yes I know that getting access is a prob
> due to AFM being removed - I'm just asking since I did that on my system
> in 'limp' mode (AFM off) yet could idle car and run it (very rich) up
> to 2000rpm... At least it let me see if the turbo was OK spinning at idle
> after it was re-assembled...
> I've been told its around 300rpm - though I didn't have a optical tacho
> handy - it looked about the speed of a regular floppy drive though ~`:o


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