where is the best spot to get it? is it better to get it from the compressor or the intake manifold? just curious

 

either one is ok. You may get a better response by taking it off the intake pipe before the throttle body. You DO NOT want to take it off the intake manifold itself.

 

thank you i was just curious also that if you take the signal from the compressor , dont you loose some boost in the intercooler, so wouldnt it be less accurate at the compressor?

 

I have my wastegate connected to EVAP Purge on the intake manifold...works fine. Why would it be bad to get it from the intake manifold?

 

because that runs at vacuum all other times other than boost times.

 

Uhhmm... anywhere in the intake tract is under vacuum when the motor is in vacuum. The manifold is fine.

Dustin

 

Hey Dustin.
You told me just the opposite when I asked this question 2 months ago!
You said not to take the wastegate actuator off the manifold rather to take it off the compressor and leave the top of the wastegate open.

I'm going to be trying a couple variations on that theme when my turbo returns from the hospital. I have a Blitz SBCid and apparently it runs best when boosting under 14psi if you set it up as an actuator style controlling the Tial external WG. leaving the top open and just running the side port through the controller solenoids.

Sounds wierd but i'm gonna give it a try.

 

dustin told me to use the manifold when i asked him a month ago. you sure you asked dustin? i've bothered him about ten times about the vacuum lines before I actually did the install, and he said the same thing everytime....

 

If you are using an EBC then it is fine to use the compressor for pressure. If you are not, then you want a pressure source after the intercooler. This is how I always answer the question, so you must have misunderstood me

Dustin

 

its better to use the turbo compressor for this reason only.... the more items you have tapped off the vacuum sources of the intake manifold, the less response you will see from those sources. the boost gauge.... the fuel presure regulator.. the fmu.. the blow off valve... all need a good responsive boost source. i have about 4 nipples tapped on the plenum for each additional item... the map.. the bov... the boost guage. you'd be surprised at the difference it makes.

 

It seems to me like it would be safer to run it off the compressor. Less chance of overboosting.

If the signal was off the manifold then by the time the wastegate got it, so would the engine. I don't know what you mean by accuracy, but as long as the boost gage is ran off the manifold I don't think it would be an issue.

I'm just spewing theory here, by the way. I don't yet have a turbo car...

 

funny, I was talking about this with art last night...

from the intruction that I got fromn the TIAL, it asked that you run the side port to any vacuum source BEFORE the throttle plate ....so anything before the TB...
I was going to run it back to the compressor, now that I an running EBC...
I had the same concern about running too many vaccum sources....

stan

 

i was thinking that if you hooked the line to the manifold the wastegate would see how much boost is getting into the engine. the way i figured(which is probably wrong)if you have a 7 lb spring in your wastegate and you hook the signal to the compressor ,once the wastegate sees 7lbs it opens, so this is 7lbs of boost b4 the intercooler, so once all that boost goes through the pipes and intercooler wouldnt actual boost getting to the engine be may 6 or so lbs? sombody prove me wrong please, because these are just thoughts. lsos, what i meant by accuracy was the wastegate making sure the full boost that its set to regulate is getting into the actual motor.

 

Actuator signal from compressor: Worst boost response (since the wastegate will be opening early) , lower intake temps .

Actuator signal from intake manifold: Best boost response , but your intercooler will be hit with higher temps due to the fact that the turbo will be able to spike . High temps are always a bad thing.

Actuator signal from "after the interintercooler and before the throttle body": Better turbo response, warm intake temps. Good/Bad.

All of the sources have its good/bad points. Getting the actuator signal from the compressor is the safest way.

 

I see what you mean. What you do then, as far as I see, is just slap an 8 or 9 lb spring on the wastegate so that by the time it reaches the engine it goes down to around 7lb. Since the boost gage is ran off the manifold, just fine tune your wastegate until you see the pressure you want on the gage.
I don't have a turbo yet, but I think wastegates have some adjustability, right?