If so, watch the turbo inlet seals, they aren;t designed for a decent amount of vacuum on the inlet.
With some nifty plumbing, you could get a bypass to work with an AFM.
you are pushing me into a direction i tried to avoid. this sounds too difficult for me now.
we did not reach vacuum after the supercherger yet. what a pity
but this is what is going to happen in the next few month
ia am looking for some information what is going to happen in this situation.
will boost be completly uncontrolable?
is a big external wastegate a way to get bether boost control?
is it dangerous for the charger spinning 80.000 something without backpressure?
thinking of a compressor map. zerro upwards to some positive pressure in front of the turbo will result in higher boost levels as normal. only the flow will stay the same.
now we have 0.4bar left. so a bigger turbo is still an option, right?
here the facts.
1st run (1500 to 6400rpm):
-300NM from 2000 to 5000
-314NM maximum at 4100
-174kW (engine) at 6200
-lambda 0.8
-0.9bar manifold pressure
2nd run (4000rpm for 10 sec)
-0.2bar behind charger (dropping from 0.3bar after stabilization)
-0.9bar behind turbo
-90°C after turbo
-60°C after last IC
-lambda 0.79
3rd run (6000rpm for 10sec)
-0.4 bar behind charger (did i say 0.2? i was wrong) it dropped after stabilization from 0.7bar
-1.3bar behind turbo
both twitching all time
-120°C behind turbo
-behind last IC 60 to 100°C and still rising
-lambda 0.77
we are on the rich side 0.85 should be possible with good intercooling i guess. of course a programable ecu will be on the list. (a MAP sensor would give a bether option for a bypass as well )
the video cam was our data logging. so pics(right away) and videos (not yet available in appropriate size) could be sent by e-mail for the catholic out there.
Tue, 25 May 2004 22:43
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