1989 sunbird turbo
I have my t3 bolted up .....
now should i run the stock vacuum line to the wastegate???
The stock vacuum line is a small plastic line that runs from the boost solenoid to the wastegate.
Or should i put bigger vacuum hose on it???
What should i do.....any suggestions are very much needed.
i ran a diff vac line simply because i thought mine was cracked
1st 1st gen on air.....
Did you run it from that nipple on the compressor housing?
And besides how does our computers measureour boost p.s.i??
And besides how does our computers measure our boost p.s.i for the boost gauge?
Boost is measured from the MAP. I am runnning mine without a boost solenoid.
Cardomain|
Myspace
Screw the boost solenoid and use a manual boost controler. like
http://www.dawesdevices.com
For boost reference I used the vac line that feeds the boost solenoid, fed that to the controller, an then used the stock hardline to go to the wastegate actuator
So the MAP tells the computer how much boost, and the computer sends that information to the boost gauge?
http://www.dawesdevices.com ........I am working my way to uping the boost...but right now i have no intercooler and and limited on money...plus i was wwanting to do a couple things before i up the boost
Gary who wrote:So the MAP tells the computer how much boost, and the computer sends that information to the boost gauge?
http://www.dawesdevices.com ........I am working my way to uping the boost...but right now i have no intercooler and and limited on money...plus i was wwanting to do a couple things before i up the boost
Correct. MAP is used for everything, and the computer powers the stock gauge (which btw is hella innacuurate, I HIGHLY reccomend getting a decent MANUAL gauge and running a vac line to it).
As far as boost controllers.. even ify ou run the stock boost level of say 9 psi you'll see a gain over switching off the stock controller. Stock controller bleeds boost a little all the time to make spool up less dramatic, and also it limits boost in 1st AND 5th gear, to limit wheel spin/ top speed, respectivly. So even ifyou aren't upping it up, still reccomend it.
I did not know that. Good stuff
But couldn't i just eliminate the boost solenoid and run a vacuum line from the intake to the wastegate on the turbo???
Gary who wrote:I did not know that. Good stuff
But couldn't i just eliminate the boost solenoid and run a vacuum line from the intake to the wastegate on the turbo???
Nope. That does two things:
1. Limits your max boost to whatever the wastegate spring strength is at. So if it's designed to fully open your wastegate at 4 psi, then you'd be limited to 4 psi. And it's actually around there or so stock. The boost controller limts the spring seeing any boost at all until you want it to open, in which case it opens it immediatly. You want a waste gate spring that's LESS then your desired max boost for this reason
2. Exerts force/boost pressure on the wastegate spring all the time. First that mkes it so that the wastegate will begin to open BEFORE your desired max boost because teh spring is seeing pressure before it should. That kills spoolup. Secondly it will wear out the spring faster cause it's always being pushed on by boost air.
Sure, in a "pinch" this works better then NOT using yoru wastegate but, no, you need a boost control of some sort.
Honestly if you can't afford a $40 boost controller you should not be modifying your car!
No i can afford it, i was wanting to put the money towards other things ...i didn't realize how much i need it...i thought i could just run off of the wastegate spring for awhile...i thought my wastegate was stock at 7 p.s.i ( saab t363 turbo wastegate).
How much boost would you consider on a non intercooled engine with high miles(160,000)?... the engine doesn't smoke...i haven't done a compression check yet.
I say around 9 p.s.i would be safe.
I just ordered a boost controller from 3bar....
