Josepi

Removing the stock ecu renders this 12v bugger useless.

Sooo, I pondering through the manual, I found myself staring at the Auxiliary output and it's capibilites.

If there is an AuxMAP_ON, it could be used to trigger the solenoid to function below certain boost, then when the desired pressure is achieved, it would shut off?

Why isn't there a AuxMAP_OFF?

SaabGuy

as I said in the mailing list, try using the intake solenoid on top of the upper manifold. it stays closed (Boost rise) until 12v is applied (w/g opens). Then all you need is some way to backvent the w/g so it will close after rise, like a vacum restrictor pill (or 2) which can be bought from advancedautoparts.

SaabGuy

I have successfully set up a primitive electronic boost control system controlled by my microtech.

What I found was one of the original stock solenoids (near the old rats nest) worked perfectly for the job. It was a solenoid with a Yellow sticker on it, not sure if that helps but heres how you can find the right one;

The solenoid only has 2 vac nipples and one vent on it. One side will remain closed unless 12v is aplied. The other side will vent to the tiny filter unless voltage is applied. Once voltage is applied the solenoid allows a non-leaking passage of air.

The side which remains closed will be plumbed to the source of wastegate control - IE the top of the turbo, high pressure. The relief side of the solenoid gets plumbed to the wastegate actuator. The solenoid works perfectly because the w/g will be allowed to vent its pressure back through the solenoid and out the venting filter. This way the w/g will close once off boost.

Now the output on the ecu was a bit tricky. its a ground signal. I had to wire an ignition +12 signal to one side of the solenoid, and the ecu output to the other side.

ECU settings are a little strange as well. You will be using the MAP_ON and RPM_ON controls for the solenoid. It kind of works like a duel switch before the solenoid actually functions. Set RPM_ON to 0060 (rpms) so that it will always be primed to come on when MAP_ON is set to whatever (do 0 psi to start!!!)

Results:

So far this system is working very well. Boost spiking may be a slight problem as it is spiking 1-2 psi past the MAP_ON point, but just set the MAP_ON settings conservitivly to start with. Boost spike is non existant with conservative throttle movements. If I floor the gas really really fast in 3rd gear the boost goes to like 8psi then drops down to 7, so thats my boost spike of 1 psi. its fine because before my w/g was opening at like 3psi which sux.

Back to the dyno for tuning now!!

Who wants a picture?

Josepi

I'm happy as hell to see one of my ideas actually work!!

Granted the email was slightly clearer to my idea...this was my first thought...then I realized that with no way to turn it off that it'd be...hmm...bad?!

One question I do have, how fast is the response?

SaabGuy

Boost rises faster than stock which is why it may tend to spike a little. I have the ecu set to 6psi and its spiking to about 8psi. its spiking I believe because the solenoid opens and the w/g actuator has to fill with compressed air. All in a milisecond but by the time the w/g is open you've hit more psi then the ecu is set for.

I do have to say that this is working quite well though!!

Are you understanding which solenoid to use now?

SaabGuy

response time from ecu?? I dont know. it would be a question for a microtech dealer.

I would assume realtime, limited to the speed of the solenoid itself. Im sure people wire in all sorts of nitrous and water injection rigs with these outputs.

jreynish

iTrader: (2)

this is exactly what i had in mind for my aux out! I am currious would this work with higher amounts of boost ie, 10 - 15lbs? This might be where i would be using this! I like the Idea of the computer controlling everything!
Can anybody tell me if this would be pratical with a lager turbo setup?

jreynish

iTrader: (2)

anybody?

jreynish

iTrader: (2)

alright? can sombody tell me if it is simply more viableto buy a digital boost controller for $400+ or would this serve it purpose and do it well enough coupled with the Microtech?
Josepi?
Sabbguy?
Anybody?

10sec rx7

i use a seperate boost controller, the turbosmart E-Boost, they work a treat and the main advantage of a good controller is they bring the boost on harder and faster!

Dale

jreynish

iTrader: (2)

dale,
could you possibly dirrect me to where i can find info on this particular boost controller, i looked but did not find much.
Thanks

10sec rx7

www.turbosmart.com.au

i can supply you one if you like, they are $749au plus shipping,

Dale