I guess it has similar boost controller as the DSMs, so it would be the solenoid. The thing is whether boost is going to be controllable that much once we put a larger high flow exhaust and the air filter.

The point is that if the normal boost is 19 psi and they cut it down to 16, that would make it that waste gate actuator is set for opening at the 19 psi as well. That would make an aftermarket crowed very happy!

Mr. AWD

 

I know nothing about controlling boost on these cars so forgive me if my question make me sound like a neophyte....but

Is adjusting the boost then as simple as effecting when the solenoid does it's job? And how does the stock waste gate actuator play into making the aftermarket crowd happy?

SC~ who's trying to understand

 

Well, since I jumped into it, I will try to dig my self out. But, remember, I will try, which doesn't mean I will!

Adjusting the boost is really as simple as that. You close the solenoid and wastegate opens and boost is dropped. The problem is that solenoid is controlled by the ECU and if there is no positive pressure sensor somewhere on the car, then ECU can just guess what is really going on. Basically, boost will depend on the way the wastegate is positioned and how much of pressure it takes to open it up. If you increase that requirement on the wastegate, you will get more boost, which is what I was referring too.

Another problem is that ECU can have bunch of other tricks in there that can affect the boost levels at certain RPMs. In the case of the 2G DSMs, that was somewhere between the 3k and 4k, where solenoid was flickering and lowering the boost down.

So, in this case (since we know that boost is somehow dropping at the high RPMs), could have had similar thing in there and solenoid gets to be used in that range, so overall boost drops down a bit. There is also a boost creep that could affect this as well, and it gets much more present in more open flow exhaust/intake applications.

Well, there is so much more in here, but I hope that you get what I was trying to say in a kind of unclear way!

Later


Fedja

 

Ah that makes sense I think. So we will need to fool the pressure sensor to get more boost then? And if there is no pressure sensor, we would then adjust the wastegate so that it doesn't open until a greater pressure is reached...

SC

 

Mr. AWD is back!!!

 

That is exactly what I was thinking as well. Also keep in mind that themothership hinted JDM spec hp of 315 could be attainable with just a Ralliart chip, add intake and exaust to that and 340-350 hp seems very reasonable.