TOO MUCH BOOST bleeding off (STS)
TOO MUCH BOOST bleeding off (STS) Just wanted to know what brand off boost controller STS guys are using and where you are getting your signal from. I ran with just the spring and direct pressure off the turbo's outlet. Netted 4.5 psi and was fairly steady. I put a Turbo XS $75.00 special boost controller on and now hit 9.0 psi at just over 4000 rpm and it drops to just about 5 psi by 6000 rpm 
. I've got a buddy with a TT supra and he runs a Hallman RX boost controller. He says 18 psi steady all day long and at the track turns it up to 21 PSI, I was wondering why my TQ numbers where great and my HP so LOW, now I think I've got it figured out! 
with the help of 12secSS. I just want a nice steady 8psi without going to an EBC.
. I've got a buddy with a TT supra and he runs a Hallman RX boost controller. He says 18 psi steady all day long and at the track turns it up to 21 PSI, I was wondering why my TQ numbers where great and my HP so LOW, now I think I've got it figured out! with the help of 12secSS. I just want a nice steady 8psi without going to an EBC. FMIC = FRONT STS = REAR, I wouldn't want to run a rubber line the whole length of the car, if the line burst or tears the wastegate could slam shut overboosting. Maybe bend an Aluminum line?
Still needs to be referenced after the FMIC, find a speciality brake line place that can make you whatever lengths you need and get to bending unless you just want to run some rubber line thewhole way.
TECH Addict
Joined: Nov 2001
Posts: 2,659
Likes: 1
From: Bellevue, Wa
yes I understand the concept, I have owned a kit for over 2 years.
why be afraid of running the line? tie it up and it will be fine. mine has been that way for 2 years, no issues.
if you want it to work right you need to run the reference from up front.
simple as that.
why be afraid of running the line? tie it up and it will be fine. mine has been that way for 2 years, no issues.
if you want it to work right you need to run the reference from up front.
simple as that.
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yea they are all right your gonna need to run it up to the front....mine is ran all the way up, get some nice rubber hose and run it up there keep it away from heat and zip-tied up and you will be fine. 8psi is not gonna bust a rubber vac line.
I run between 10 and 14psi on my STS car with the boost reference from the compressor housing... solid boost, no spike, no creep, nothing.... I don't understand why everyone says you have to reference from the manifold.
It doesn't make a difference. All a boost controller is, is a ball and spring. It doesn't know what PSI it's seeing, it just knows if you want more pressure or less.
If you have 20psi at the compressor and only 10 in the intake, why does it matter? If you want more in the intake simply adjust the controller.
If you have 20psi at the compressor and only 10 in the intake, why does it matter? If you want more in the intake simply adjust the controller.
thanks hydrosteam, Thats the same thing I thought. Pressure drop across the intercooler is constant. Or so close that it doesn't make a difference. When I was running just a spring with no boost controller, boost was constant. I'm gonna try my buddies Hallman RX controller first. If pressure holds constant then I'll be done If not I'll run a hard line from the motor back
Two things I would try before you give up on your MBC.
1. Take yours apart and clean it.. sometimes oil or whatever can stick inside.
2. Put a restrictor inline. Go to Advance Auto Parts or whatever is near you and go to the vacuum tee section. They make a reducer where you can cut off the end to make it whatever size you want. Put that in there as it will restrict some of the air. Keep in mind your MBC will have to be adjusted with the restrictor inline.
1. Take yours apart and clean it.. sometimes oil or whatever can stick inside.
2. Put a restrictor inline. Go to Advance Auto Parts or whatever is near you and go to the vacuum tee section. They make a reducer where you can cut off the end to make it whatever size you want. Put that in there as it will restrict some of the air. Keep in mind your MBC will have to be adjusted with the restrictor inline.
And do you know why it will go away? Or just that it will because you've read it on here?
Putting it after the IC would be about the same as putting a restrictor inline. My bet is this: the MBC can't handle the amount of air going through it being referenced from the compressor. Therefore if you move the reference to after the IC where there is less pressure, the MBC can handle it. Therefore if you just put a restrictor inline to the MBC while still using the compressor as the reference if would work the same... as well as save you about an hour of running a tubing the whole length of the car.
Putting it after the IC would be about the same as putting a restrictor inline. My bet is this: the MBC can't handle the amount of air going through it being referenced from the compressor. Therefore if you move the reference to after the IC where there is less pressure, the MBC can handle it. Therefore if you just put a restrictor inline to the MBC while still using the compressor as the reference if would work the same... as well as save you about an hour of running a tubing the whole length of the car.