Monty Roberts wrote:
Why reinvent the wheel? The model jet people have long since decided the
best thing to do is place a magnetic washer under the compressor nut and
place a sensor on the outside of the inlet.
See:
http://nades.net/catalog/index.php?cPath=22_25
Also note the thermocouple. You will of course have to devise your own
guage. I would use one of the new USB based data aquisition products.
You
could interface with a lap top. Or maybe a PDA. Not sure if they have
USB
ports or not.
See:
http://www.azeotech.com/products.php
Monty
Thanks for the turbo charger tach tip Monty. How far away is the sensor
from
the magnet?
I was just getting ready to design a water cooling system for the 75 C
plastic
fiber optics. We only need this thing for R&D. Once we have a handle
on the RPM we don't need it anymore.
Paul Lamar
François Badoux wrote:
We have the turbo RPM sensor which Monty talks about on both the bench
engine for R&D purposes, as well as on the Arrow for altitude testing. I
don't remember the cost of the sensor, but the very fact I don't remember
means that it is not very expensive. It is easy to install and works just
fine.
Francois--
What kind of RPM numbers are you seeing Francois?
Paul Lamar
On the original Mazda turbo, we see 105,000 RPM at max power (6,200 shaft
RPM, 42") at Geneva's elevation of 1,400'. 130,000 RPM at max continuous
power (6,200 RPM, 39-40") at around 10,000'. As we don't have the Mazda
unit's chart, we have arbitrarily set the limit at 130,000 RPM.
Anyway, we are moving to a T04E-60 compressor which fits our needs almost
perfectly (we are "riding the crest" at 76-80% efficiency, slightly on the
"safe" side, away from the surge line).
Francois
Thanks Francois that is pretty close to what we are guessing at.
I think Dave Leonard is going with the same compressor wheel and housing.
It will be good to see the new performance data. If it works out I will
get mine modified as well :) Did you have to space the turbo out to
accommodate the larger compressor wheel?
Who modified the turbo for you?
Dave who did yours?
BTW Francois got any pictures of that mounted turbo tach circuit. I can't quite
figure out how it is mounted from just looking at the pictures on the
Spanish manufactures web site.
Paul Lamar
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