Turning down Boost

[BoostedSpd6]

ok theres alot of talk on here of turning up the boost with an MBC or EMS... but what about turning it down.. alot of my friends have two settings one for street one for track, whats the lowest we can turn our boost down to keep the turbo safe? im thinking maybe 8psi.. because with the big turbo 8psi is more then 8psi with the stock one because of more air flow..

 

[njaremka]

why? stock boost on the stock turbo will be fine for at LEAST 100,000 miles - if it wasn't, mazda wouldn't be able to sell any

 

[TX Speed 6]

I don't think he has the stock turbo.... I might be wrong, but I'm pretty sure he upgraded

 

[shane02pro5]

You can't turn it down below what the wastegate spring is rated at. You should be able to get a wga with a lighter 8psi spring.

 

[jcgemt2003]

The wastegate on the stock turbo is 10psi...we've tested on my car.

 

[pHeeL tHiZ ViBe]

then 10 psi it is

 

[BoostedSpd6]

well ya i was wondering what u could do with the stock one..but yes i am upgrading just havent done it yet... whats the lowest the bigger turbo can go?? im guessing 12-14 somewhere in that area... im not turning either of them down.. more or less this is just a general discussion for people who want too.

 

[terbow]

as said above ur limited to the wastegates base pressure, u cant go below that its mechanically impossible. u can only go up. so the lowest u can go depends on the lowest wastegate actuator u can find that fits.

 

[pHeeL tHiZ ViBe]

yep yep, ^speaks the truth. as far as what the minumum boost level is well..you can safely boost 0 psi if that is your desire

 

[speedi3]

ok theres alot of talk on here of turning up the boost with an MBC or EMS... but what about turning it down.. alot of my friends have two settings one for street one for track, whats the lowest we can turn our boost down to keep the turbo safe? im thinking maybe 8psi.. because with the big turbo 8psi is more then 8psi with the stock one because of more air flow..

This is what i want to do. How do you control the boost and set it at say 16 psi no more! THANKS!

 

[dadasracecar]

That explains why I was getting boost when the standback was set to 0 psi... D'OH!

 

[pHeeL tHiZ ViBe]

haha yep that would be it..although it would be cool if the standback just held the wastegate open for 0psi. i don't understand how the standback controls the wastegate at 255 different degrees, but can't just hold it open when set to 0psi of boost. ??hmm ah well. wonder if we'd be able to get close to the 2.3n/a economy of about 35mpg!!

 

[Silo]

Setting to 0 psi of boost...? If you recap how the wastegate based boost control works you will quickly notice that it is impossible for any kind of boost controller to make less then the w/g set boost. To accomplish the 0 psi idea it would have to incoporate an auxiliary air compressor and feed enough boost to the wastegate to push it open before the turbo starts spooling from the exhaust gases.

 

[pHeeL tHiZ ViBe]

ya ya i know, i get it. it would just be cool i thought, like turning a s/c off lol.

 

[MS6mike]

whats the best seting for low boost witha atp gt 3076r?