LadaTrouble
Automotive
I the case of a defective wastegate,can a blow off valve be used for boost control?
Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
Blow off valve for boost control
- Thread starter LadaTrouble
- Start date
- Status
- Thread starter
- #3
LadaTrouble
Automotive
Someone has been tampering with the wastegate controls,and some are in the bin,never to return.I have no information on the vehicle,and parts supply is nonexistant.Just looking for an easy way out.
I would set it up like a friend of mine did - a seperate exhaust system complete with muffler,that should control the noise.Anyway,it has to be noisy so I can hear over the boom box!
The vehicle in question is a 1987 Daihatsu Charade GT ti,DOHC,3cyl.Not totaly rare,but thin on the ground in my market.
I would set it up like a friend of mine did - a seperate exhaust system complete with muffler,that should control the noise.Anyway,it has to be noisy so I can hear over the boom box!
The vehicle in question is a 1987 Daihatsu Charade GT ti,DOHC,3cyl.Not totaly rare,but thin on the ground in my market.
Your fuel/spark system will probably hate you. You will also wear out your BOV quickly (using it alot more than you normally would) and if its not adjustable you will probably need a smaller one anyway (unless you are planning on upping the boost to where it blows off anyway).
-=Whittey=-
-=Whittey=-
If the wastegate is still intact, and just not hooked up, then you can rig up a manual controller that will work very well.
A bov can regulate boost to some extent, but it doesn't do a good job of it. With an inactive wastegate (closed) the turbo will generate as much boost as possible. The engine will most likely not be able to handle the boost pressure. If you have the BOV vacuum port connected to the intake manifold, it will maintain compressor pressure x psi above manifold pressure. It will bleed off the extra boost, but if you floor it, you'll still get full boost. Using the throttle to control boost like this is a bad idea, you'll end up wiping out the thrust bearing in the turbo because of the large pressure differential across the turbo. (happened to me a few times until i figured it out)
So... if the wastegate can is still there, and you can move the arm, then i can help set up a boost controller for you.
A bov can regulate boost to some extent, but it doesn't do a good job of it. With an inactive wastegate (closed) the turbo will generate as much boost as possible. The engine will most likely not be able to handle the boost pressure. If you have the BOV vacuum port connected to the intake manifold, it will maintain compressor pressure x psi above manifold pressure. It will bleed off the extra boost, but if you floor it, you'll still get full boost. Using the throttle to control boost like this is a bad idea, you'll end up wiping out the thrust bearing in the turbo because of the large pressure differential across the turbo. (happened to me a few times until i figured it out)
So... if the wastegate can is still there, and you can move the arm, then i can help set up a boost controller for you.
- Thread starter
- #6
LadaTrouble
Automotive
Thanks for the help,the wastegate is opperating,but I am concerned about missing electical valves,I don't know what they were or what they did.I will drive it with a guage on today and see what it's doing.
- Thread starter
- #7
LadaTrouble
Automotive
10psi boost,this motor outs 100hp from 1000cc.It's getting up there,but not tooo high a boost.
- Status
Similar threads
- Question
