Problems with in-car mbc?

[Boostmonkey]

Hey i just ordered a manual boost controller from QBoost, (off the vendor page) and i was wondering if it was reliable / efficient to have it running into my cab. I payed the extra 20$ or so for the 'in car' kit. Does having the controller sticking out of my dash or something sound bad to anyone? any forseeable problems? If there is something wrong with it i can just cut the vac hoses and put it where it should be, but it would be handy to have a cheap way to change boost from my seat.


Dave

 

[Defiant]

Longer signal (vacuum/pressure) runs will make for delayed response.

But why do you need to "adjust" your boost? Have you looked into an electrically- selectible boost scheme?

 

[Boostmonkey]

Thanks def,
Yeah i know about the electronic alternatives, but i need a cheapie for now. I was gonna make my own but saw an in cab mbc and thought i would give it a shot. Do you know the approximate reaction time between adjustments? I wouldnt need much boost for daily driving, but if i wanted to come home from work a little quicker one day and didnt wanna pop the hood this would be ideal or if i ran into one of my buddies on the road and wanted to screw around. would it take a few miles for the new boost to register? or more/less?

also can you turn you boost down (below stock) with a mbc? would that help gas mileage? or be even worth it at all / harmful.


Dave

 

[soul]

can't turn it down below stock pressure

 

[Boostmonkey]

Thanks soul


Dave

 

[Defiant]

Thanks def,
Yeah i know about the electronic alternatives, but i need a cheapie for now.

You can't get a lot cheaper than ten or fifteen bucks.

I was gonna make my own but saw an in cab mbc and thought i would give it a shot. Do you know the approximate reaction time between adjustments?

It's not the adjustment lag, it's the opening of the wastegate lag after the adjusting's done. The turbo is having to pressurize whatever length of tubing you're running. Notice how the MBC installation instructions advise to keep the runs as short as possible.

I wouldnt need much boost for daily driving, but if i wanted to come home from work a little quicker one day and didnt wanna pop the hood this would be ideal

You'll shoot your eye out, kid.

or if i ran into one of my buddies on the road and wanted to screw around. would it take a few miles for the new boost to register? or more/less?

Again, that's not the problem. Excessive boost levels before the wastegate opens are.

also can you turn you boost down (below stock) with a mbc?

No. Only a weaker wastegate solenoid spring will do that.

would that help gas mileage? or be even worth it at all / harmful.

You're not going to get really good mileage with such a low-compression engine. Your best efficiency is probably in running just a couple of pounds worth of boost.
There's reasons you don't see more dash-mounted mechanical boost controllers.

 

[Boostmonkey]

Figured as much, ill just cut the vac hoses and put it where its supposed to be. thanks a ton.

Dave

 

[out there]

you could get a solenoid to switch back to the stock routing, and switch from in the cabin... or just buy a kit http://www.dejontool.com/DSM-MBC.htm

 

[Boostmonkey]

Hey thats exactly what i wanted to do!

Thanks for the link

Dave