Okay I know I shouldn't have done this but I was tinkering with my boost controller today and now I'm wondering this, when do you set up a manual boost controller, like when should you adjust it, open throttle, or what? Does anyone have a SPEEDAIRE manual boost controller w/ yellow top? Also when I am just barely putting any gas on it and it is at -15 psi my shifter rattles like a bitch and the exhaust makes a weird noise. like Blib blib blib blib blib instead ob booooooooong, I this started after I put on my airpump on and fixed some vacuum leaks. 89 GTUs Turbo II Swap is what I have, intake, 2.5" down pipe and mid pipe with a cat, Borla Cat back. Greddy type-R BOV are my mods. Thanks in advance.

 

That's a scary question to ask. You sure you know what you're doing?
You set the controller to the maximum boost you want. So you want a high gear (3rd+), high load (a hill) and WOT. I've never heard an engine make either of those noises...

 

The booooooog is the backflow of my exhaust, like how it sounds with negative pressure, the blip is what I have never heard before, the Borla makes it sound almost like a V-6 or small V-8 when it idles. The SPEEDAIRE thing is just a air pressure controller.....not an actual boost controller, but that is beside the point; it is the same concept as a normal manual boost controller. When should I adjust the boost? What does WOT stand for.

 

you adjust the controller with the car stoped... 1/4 turn at a time. doing "Wide Open Throttle" (wot) runs inbetween till you get it at the boost you want.

 

WOT stands for Wide Open Trottle. But I have never heard of WOt having anyhting to do with a MBC. Your best bet is to open the MBC all the way up .. then crank it down a couple of turns and gofor a WOT run (I hope you have a good aftermarket boost gauge) keep an eye on your boost ... try to do a run up a hill in 3rd gear for max boost, then close the MBC little by little after each run till you reach your desired boost threshold. But it would be alot safer on a Dyno .. or with some kind of fuel control & fuel monitoring ... bump up boost at your own risk!

 

I want to lower it im running w/o a boost conroller and i don't boost (sometimes 1 or 2 pounds) and i want the max to be like 1 so I don't creep. Thanks alot.

 

 

you mean 1 bar? not 1 lb?

Jameson

 

Haha I hope so

Creeping from 1 PSI is called boosting, it's quite alright

 

Huh? That makes no sense. Max right foot (WOT) = max boost. Why would you set your boost using anything other than full throttle?

 

I meant WOT has nothing to do with setting it ... yes WOT on the runs of course.... just a misunderstanding. When the car is off and you are turning the MBC WOT has no effect.

 

Anyone want to place bets on how long this kids motor is going to last?

Ok it's been said a million times, boost controlers can NOT lower boost. If you want to raise boost then a boost contoler is what you need. Set the boost controler up so that it is open all the way, if this is done then when you do a WOT run the boost you see will be the lowest boost possible with your current setup, if this level of boost is too low then begin adjusting the controller by small incraments untill the desired boost level is reached.

 

just turn it a tad while the car is runnin pop the hood and turn it a bit both ways. make a run at wot and see where the gauge goes. i hope you have a aftermarket gauge though. keep doing that till you get it where u want. but a manual boost controller cant make u loose boost from whatever your suppose to have factory

 

[QUOTE]Originally posted by rx7_turbo2
[B]

Anyone want to place bets on how long this kids motor is going to last?
Yeah okay ******* thanks for flaming, the car has lasted over year w/o problems,.
Ok it's been said a million times, boost controlers can NOT lower boost.
THUMBS UP FOR MR. KNOW IT ALL, actually I HAVE lowered my boost, hmm it went from 5.5 to 3, even under WOT, see this is a SPEEDAIRE air pressire regualtor so.........it's not a standard boost controller..I just found that out... Maybe you could actually try to help me instead of making things worse for me. guess you don't remember what it was like to be a kid and have to pay for the car all by himself. I'll get a FMIC when I can afford one.........**** off ADMIN delete this post

 

[QUOTE]Originally posted by JAPSPECGTUs
[B]Hey Chief take it easy. First things first learn how to use the search function. Next up you never mentioned it was a SPEEDAIRE. Finally I did help you, read my post again. In addition I am a kid paying for things by myself, I am currently working on making enough money with my part time job to do my first rebuild, so chill out.

 

if you are boosting less then 5.5psi then you turbo or wastegate is screwed... nothing you add can lower it.

 

There are two types of manual boost controllers. One is a Pressure Regulator Valve and the other is a Pressure Relief Valve.

In the first case the Wastegate Actuator will see no more pressure than the set point on the valve. So if the valve is set at 6psi the wastegate actuator will see no more than 6psi even if the intake manifold is seeing 12psi. It’s exactly like the valve on the top of the oxygen tank on a cutting torch.

In the second case, the wastegate actuator will see no pressure until the turbo is putting out the set-point pressure. So let’s say you set the valve at 9psi. Once the turbo gets to 9psi the valve snaps open and the wastegate actuator sees an instantaneous 9psi. But from that point on, the wastegate actuator will see whatever the turbo puts out – Unless the pressure falls below the set-point at which time the valve closes.

So in one case you set a maximum pressure and in the other you set a minimum pressure at the wastegate actuator.

I’ve built both. They both work. But in either case you can’t reduce the boost pressure below what your system will produce naturally.

Rob

 

I can't test any of this anyhow, w/o an intercooler I cannot do any WOT runs, too harsh on the motor, it gets enough boost from the 1-2 psi it sometimes reaches to.