also mike W im intreseted how did porsche reloacte it? where did they move it? im intrested in any info youd have as well.


aloha

 

I designed the circuit on a web based circuit simulator. Open http://www.falstad.com/circuit/ and Import my circuit:

$ 3 5.0E-6 1.5 74 5.0 50
R 416 136 416 72 0 0 40.0 5.0 0.0
r 416 136 416 168 0 47000.0
r 416 168 416 216 0 47000.0
g 416 216 416 248 0
a 448 184 560 184 0 5.0 0.0
w 448 200 448 248 0
w 448 248 480 248 0
w 448 248 448 280 0
w 448 280 544 280 0
r 480 248 512 248 0 100000.0
r 544 280 576 280 0 56000.0
w 560 184 560 248 0
w 560 248 512 248 0
r 560 184 592 184 0 100000.0
w 592 184 624 184 0
w 624 184 624 136 0
w 624 136 640 136 0
c 640 136 672 136 0 3.3E-8 0.00866109236859014
w 672 136 688 136 0
w 688 136 688 200 0
a 624 200 688 200 0 5.0 0.0
w 576 280 688 280 0
w 688 280 688 200 0
w 432 264 608 264 0
w 608 264 608 216 0
w 608 216 624 216 0
w 720 280 688 280 0
g 864 280 864 328 0
R 864 96 864 64 0 0 40.0 5.0 0.0
w 864 248 864 176 0
w 600 408 640 408 0
t 536 344 568 344 0 1 -3.120988324771716 -5.019480019980018E-5
a 440 408 528 408 2 5.0 0.0
L 384 416 320 416 0 false false 4.5 0.5
w 440 376 440 400 0
w 704 376 704 408 0
w 704 408 640 408 0
a 464 344 504 344 2 5.0 0.0
r 536 344 504 344 0 100000.0
g 568 360 576 368 0
r 568 328 608 360 0 50000.0
a 304 352 368 352 2 15.0 -15.0
w 368 352 464 352 0
w 368 352 368 320 0
w 368 320 304 320 0
w 304 320 304 344 0
L 264 360 216 360 0 true false 3.5 2.0
c 640 360 640 328 0 4.9999999999999996E-6 3.1209381349715164
w 640 360 608 360 0
g 640 328 640 312 0
x 232 380 248 380 0 15 MAP
w 864 96 864 136 0
x 355 435 371 435 0 15 TPS
x 173 328 189 328 0 15 Boost Setpoint
w 416 168 432 168 0
w 432 264 432 168 0
w 432 168 448 168 0
a 744 264 832 264 3 5.0 0.0
w 704 376 704 256 0
w 704 256 744 256 0
w 720 280 744 280 0
w 744 280 744 272 0
f 832 264 864 264 0
r 304 360 264 360 0 100000.0
r 440 416 384 416 0 100000.0
w 440 376 528 376 0
w 528 376 528 408 0
d 640 408 640 360 0
w 464 336 160 336 0
r 160 336 160 280 0 50000.0
r 160 336 160 384 0 50000.0
g 160 384 160 424 0
R 160 280 160 240 0 0 40.0 5.0 0.0
162 864 136 864 176 0 1.0 0.0 0.0
r 568 464 520 464 0 50000.0
r 568 464 608 464 0 50000.0
g 608 464 648 464 0
R 520 464 472 464 0 0 40.0 5.0 0.0
w 600 408 568 408 0
r 568 408 568 464 0 100000.0
x 543 497 559 497 0 15 TPS Adjust
r 544 408 568 408 0 50000.0
w 544 408 528 408 0
o 22 128 0 10 10.0 4.8828125E-5 0
o 36 64 0 3 5.0 9.765625E-5 1
o 73 64 0 2 5.0 0.1 2


You will have to maximize the window to see it all. I designed it to use TPS and MAP input to control boost. At low TPS the vanes will be open(low boost) and at high TPS the vanes will be closed(high boost). With TPS there is no delay in the contol(as soon as you step on the throttle the vanes close). The MAP input it to control max boost pressure. I set it up to slowly change vane position to prevent it from overcompisating. This might need some tweaking depending on how fast the vanes respond. There are also two POTs. One is to control the boost setpoint(Max boost pressure desired) and the other is a TPS adjust(to change at what TPS position to start closing the vanes. The LED light is to Simulate the Turbo control valve. You can run this circuit in this program and see how it resonds to to changes in TPS and MAP by clicking on the large H and L.

 

the only issue I am seeing with what you have explianed is that with the at high engine revs and high throttle demand with the vanes closed you would create too much exhaust backpressure for this to work. The diesel engines use an exhaust backpressure sensor to keep this in check

 

Once the desired boost pressure is reached the vanes start opening to maintain the desired boost pressure. At high revs/high throttle the vanes will only be closed as far as nessisary to maintain that boost level. The diesels use the exaust backpressure sensor as the primary input to control the turbo to eliminate turbo overspool incase a charge air hose blows off. You could use an exaust backpressure sensor to control the boost level instead of the MAP senor, but since there is already a MAP senor on the car I just used that as an input. Using a MAP sensor as the primary input also will maintain a more constant boost level because exaust backpressure is not proportinal to boost pressure. At Higher RPM there is more backpressure at the same boost level, so if you use the exuast backpressure as the input, your boost pressure will drop of at higher RPMS.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kauai96 &raquo;</TD></TR><TR><TD CLASS="quote">also mike W im interested how did Porsche relocate it? where did they move it? im interested in any info you'd have as well.


aloha</TD></TR></TABLE>

The turbo didn't move. the mounting bracket was redesigned with more points actually touching the engine. Just that i am told was enough to keep the heat at a manageable level.
The workshop manual has huge warnings about bolting down all mounting points and having them torqued properly just for this reason.

 

Couldn't one of the outputs from an aem box be configured to run this? Perhaps the output usually assigned to the boost solenoid (also pwm if I remember correctly)?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KeyserSoze &raquo;</TD></TR><TR><TD CLASS="quote">Couldn't one of the outputs from an aem box be configured to run this? Perhaps the output usually assigned to the boost solenoid (also pwm if I remember correctly)?</TD></TR></TABLE>

Sounds like it could, using the inputs that already go into this computer