MazdaRx7Racer4Life

well, I was sitting in my car contemplating how boost controllers cannot lower boost, only increase it. This is because the vacuum signal can be delayed but not advanced right? well what if there was a boost controller solenoid that could produce some sort of a vacuum pressure that would allow the wastegate to open at whatever stage you'd want it to. Wouldnt you be able to keep boost as low as you wanted? I was a little drunk when I thought this up so pardon me if its a dumb idea.

MazdaRx7Racer4Life

bump

jreynish

iTrader: (2)

the only problem with that thought is, that most turbos will still produce boost even if the waste gate stays open all the time and fully. And because of this no amount of "advanced" actuation of the wg would lower boost because the turbo can still boost.

White_FC

The reason you cannot lower the boost is because of the physical size of the wastegate.

Opening the wastegate 'earlier' will just make the car seem more laggy than it needs to be.

Even if you wire the wastegate fully open on most factory turbo cars you will still see at least what the stock factory max boost level is.

It will just happen later in the RPM band.

jonfc3s

iTrader: (3)

MazdaRx7Racer4Life check pms,...

chris_stampe

you can lowe boost.....a smaller wg spring and a bigger wg. Just costs $$$$$

jreynish

iTrader: (2)

you can't just lower it by simply lowering the setting on a boost controller. you have modify or adapt a larger wg to lower the amount of gasses that hit the turbine to "lower" boost.

NZConvertible

For about the millionth time...

Boost controllers can only raise boost.
Boost controllers cannot lower boost.
Boost controllers cannot cure boost creep.

Jaared

i think he was curious if a pump sent a pressure signal to the WG and had it open sooner would it lower boost.

The answer IS no... but thinking out of the box is good. Too bad it wont work for reasons listed above.

This forum is full of cool ideas like roller apex seals for one... wont work... cool idea tho. If all new ideas were good ideas that worked then... well thats another thread in it self.

The answer to all threads for the msot part is and should be... port your WG.

VietFC

might as well bypass the turbo

JonEQuest

I have thought of this same sort of thing, it would be sort of a "valet" mode for performance cars that would limit the performance greatly so that the valet parker, your roomate, or whoever you loan the car to would not have access to the extra power. My design...(still in my head for now).... would have a keypad or a more convenient, small keyswitch. When the key is ON a light/display would show "Performance mode" or whatever, this would be for me. Then if I turn that key off and take it with me the display would read "Valet Mode" or "Limited Mode", etc. With the key OFF the boost would be at factory level, (you can't go lower of course) due to a solenoid closing off the boost controllers ability to "bleed off" wastegate pressure. BUT here is where mine gets usefull, there could also be an RPM switch that would only let the engine goto a set RPM then start cutting spark, sort of like a OEM ECU hitting the speed limiter. Also if you wanted to you could read the pulse of the speedo signal to the ECU/cruise control and use it to trigger an RPM switch, since an RPM switch only looks at the negative pulse of the coil this would be a possible mod to do if you are experienced at installing troubleshooting cruise controls (I am from my last job).

Most people would say this is WAY to complicated to be worth the trouble, yes you are right, for ONE car it is. But if I ever get around to designing the first one, I could make as many as I want as self contained units about the size of a turbo timer, or smaller. The install would just be a handfull of wires and one external solenoid, the only hard to find wire that would vary between vehicles would be the VSS, or speed signal wire. And those can be found through cruise control install guides.

Any thoughts?........

MazdaRx7Racer4Life

lol, thats something like what I was thinking, a "Safe" mode, I know that boost controllers cannot lower boost, I was just trying to get my brain goin a little bit Thanks for the info guys.

jonfc3s

iTrader: (3)

MazdaRx7Racer4Life, are you going to stop ignoring me and check your pms. I am fixing to get the authorities into this,

Jonathan

MazdaRx7Racer4Life

I PMed you back already jonathan. Your thing is on the way, you don't have to hijack EVERY thread I start to remind me. Check YOUR Pms.