I had a simple idea for the upcoming turbo build and wonder if anyone else has come across this before.

I was thinking of wiring a simple push button to the steering wheel. It would be wired up to a transistor and solenoid. Along with an MBC.

I am planning on running on the set wastegate pressure, but thought that with this I could do bursts of maybe 4 psi over. IE wastegate pressure = 8 psi and overboost to 12 psi for short bursts.

I know I've seen this in places. The VW GTI has an automated overboost feature, also the GT-R SpecV has one(on the cruise control).

I'm mostly worried about how a sudden push of the button at full boost(WG limited) would react. The wastegate would possibly crack/break from the sudden change in pressure at the reference port, instead of a slow leak? Wouldn't it slam the flapper shut(Int WG)? or would it not be as violent?

Also Tuning is the other major issue. I'm pretty new to the AEM FIC, but is there a way to wire to an aux port and program to switch maps when the aux receives a voltage? Would this even be necessary if I just tune for 12 psi?

If there are problems what are some potential solutions?

I hope this isn't a stupid question or a ricey idea. Sounds like a NOS button, but just not.

 

You can tune the fic to those boost levels on the same map, no need to switch. As far as your idea I have no comment really. Cool if you do it.

 

I figured the FIC wouldn't need to be configured, just tune to the higher PSI.

 

I think that would make you run super rich though. Does the FIC do correction via a map or something?

Truthfully though I think it's kinda ricey. Just setup a switch to swap between maps and either turn the manual boost controller or install an electronic one.

 

Of course, the FIC has a MAP sensor.. The fuel map has plenty of resolution.

 

I don't know. To me it seems like by adding a feature to the car I add more control. Not to mention it seems fairly practical. Hopefully I'll try to do a professional looking job. No like, Fast and Furious looking button.

 

You have and will continue to have more things to worry about when building and continuing to build a turbo Tiburon than an "optional" switch. Put your thinking to better use by finishing the project and boosting more.


KISS

(keep it simple stupid)

 

This can and has been done for years before it popped into your head...lol Ever hear of a 2 stage MBC? Same concept.

As far as the tuning goes you can go a couple of ways. The easiest way is to use the MAP sensor as the deflection input instead of the TPS sensor. That way each column of your tune map will be a different boost level. Want low boost? It runs in one part of the map. High boost? The other part.

The harder way is to wire in a switch that toggles not only the MBC, but which MAPs the FIC uses. That way you have a whole completely different map for low and high boost levels.

But like Jon said, use the KISS principle and focus on getting safe boost first before you start changing things.

 

I've known of the dual stage mbc and that's what i'm trying to emulate. They are about $150, which is pretty pricey for something that I can build myself.

That's mostly what I'm wondering about. I don't want to break something physically because of some safety mechanism of these dual stage ones. that I should be emulating.

The other thing I'm thinking about is a timer that will only run it for maybe 20 seconds. Then can't do it again for another 5 minutes. This would safely regulate the use of the button.
Also require the button to be pressed for like 2 seconds before it kicks it so I can't accidentally hit it.

Also does anyone have any advise for using one of the horn buttons. How tough would rewiring be for one of these?

 

This is one of those ideas that sounds good in your head, but when you put it on paper you see all the problems...

Would that even be worth it?

Im with JonGTR, youll have way more fun sorting out all the other problems your gonna have, than to be thinking about this right now.

Lol at your car having a cooldown for the boost.. its like its a WoW cooldown..