Hey Guys and Gals. I have been seeing threads on here saying that a boost controller doesn't lower boost. Then what the hell does? I am getting pretty close to the time of installation for the MSP turbo that I have and I was told by someone that A manual boost controller would lower the boost from the 6.5psi stock down to 5psi. If this is not the case then how would I go around to getting the wastegate to open earlier(at 5 psi)? Any help would be appreciated. Thanks.
?How to boost only 5psi?
- Thread starter bumpin_p5
- Start date
A manual boost controller can't do anything to lower the boost.. at all. It can make the turbo spool slower, making it feel more laggy, but that's about it. The wastegate actuator sets the minimum. If you want to go lower than what the stock MSP has, you'll need to source a different wastegate actuator. ATP Turbo sells a couple for the MSP turbo but I think they are higher PSI than stock. If your wastegate has an adjustable rod on it you can also adjust it so that there is less preload on it, which might reduce the amount of boost made but can also have the effect of making it a little laggier.
loserkidwac
Member
- :
- 2003 Mazdaspeed Protege and 1991 Honda CRX Si
you can make the stock acctuator work as an adjustable if you cut it and thread both side and use on of the long thead nuts (the real name is slipping my mind, go look at home depot) but lengthening or shortening the rod this will allow you to lower or raise boost...it is a trial and error method though so it might take some time to get it where you want it to be...
Why do you want to run less than 5 psi?
Why do you want to run less than 5 psi?
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- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
if you replace the wastegate actuator on the t25 with an adjustable one you can set the boost to whatever you want. why do you only want to hit 5psi?
by the way, still haven't gotten that boost controller and o2 clamp, but looks like I wont need the boost controller anyways. Got an email last weekend that it shipped, but haven't heard anything else about it or seen it yet. Any word on that Mr. Ken?
Maxx Mazda
Contributor
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- Stock P5
Bah. Be like me. Hit 12psi and melt a piston... Schweeeet! 
At least you never have to worry about bending rods on your auto.. I'd rather blow a tranny than an engine any day of the week.
And yes that is adjustable. You can fiddle around with loosening it to see how that performs, though I don't know how accessible the adjustment will be once it is mounted on your car.
And yes that is adjustable. You can fiddle around with loosening it to see how that performs, though I don't know how accessible the adjustment will be once it is mounted on your car.
loserkidwac
Member
- :
- 2003 Mazdaspeed Protege and 1991 Honda CRX Si
I believe shortening it will lower bost sense the actuator will have less travel and be more responsive...
Maxx Mazda
Contributor
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- Stock P5
bumpin_p5 said:
I dunno. I think the torque converter would jsut slip, would it not?
Bala de Plata said:
One of these days... one of these days... I have checked that site out a few times and I will eventually do it, but right now, I have other things that my money needs to go to.
