What is the difference between an fmu, a boost controller and a Turbo timer? Sorry for being such a noob to FI but i am trying to learn

 

an FMU is a form of fuel management

boost controller hooks upto your wastegate and regulates how much boost gets into the engine (6psi, or 15psi for example)

a turbotimer is an electric count down that alows you to remove your key and lock your car while it stays running (for a preset amount of time) and cools down the turbo... (keeps you from having to sit in the car while it cools down after hard driving)

 

so a boost controller would also control the BOV?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brickonwheels &raquo;</TD></TR><TR><TD CLASS="quote">so a boost controller would also control the BOV?</TD></TR></TABLE>

A boost controller has nothing to do with your bov. As R THIS said, a boost controller controls how much boost your engine sees. When you shift and your motor is under vacuum, the BOV opens, allowing all the air crammed into your charge pipes by the turbo to be released through the BOV, instead of making their way back through the turbo, which causes compressor stall; which is very hard on the bearings and turbo life in general.

 

So the only way to control a BOV is with a spring then?

 

bump for the ignorant

 

If you are planning on boosting, please don't.

 

you need to understand the basic components of a turbocharged vehicle and how the system is designed to work.

http://auto.howstuffworks.com/turbo1.htm read though this.

search for more faqs here or on google about the basic parts/ components to a given setup.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xaznxboixsirx &raquo;</TD></TR><TR><TD CLASS="quote">If you are planning on boosting, please don't. </TD></TR></TABLE>

What the hell is wrong with not knowing? At least i have the curiosity to try and find out. There was a time, I'm sure when you yourself didn't know ****, but through time and dedication you were able to gain knowledge of cars and how turbochargers work along with all of their parts. At least other people on here were kinda enough as to at least lead me to another site where i can learn. So all i have to say to you is **** OFF!

 

i did read the editorial and I do understand the basics of turbos, however, i am still trying to understand if it is only a spring that controls whether or not a BOV is open or if by some other means. I am confused because if one were to turn up the boost from 7psi to 8psi, how would the BOV be affected?

 

Boost keeps it closed by pressing down on the valve while in boost..when you are just driving a spring keeps it closed. When you relase the throttle there is vaccum in the intake manifold which then pulls open the bov valve.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brickonwheels &raquo;</TD></TR><TR><TD CLASS="quote">

What the hell is wrong with not knowing? At least i have the curiosity to try and find out. There was a time, I'm sure when you yourself didn't know ****, but through time and dedication you were able to gain knowledge of cars and how turbochargers work along with all of their parts. At least other people on here were kinda enough as to at least lead me to another site where i can learn. So all i have to say to you is **** OFF!</TD></TR></TABLE>

Dude, don't need to angry now...I'm just saying not to boost until you know enough about it cuz you'll blow up something. Gezzzz...angry people these days..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by brickonwheels &raquo;</TD></TR><TR><TD CLASS="quote">i did read the editorial and I do understand the basics of turbos, however, i am still trying to understand if it is only a spring that controls whether or not a BOV is open or if by some other means. I am confused because if one were to turn up the boost from 7psi to 8psi, how would the BOV be affected?</TD></TR></TABLE>

Turning up the boost will only make the BOV release more pressure. So, pretty much, it will just be louder if you boost more, but that also depends on what BOV you use.

 

Thanks for the help, i finally understand.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xaznxboixsirx &raquo;</TD></TR><TR><TD CLASS="quote">

Dude, don't need to angry now...I'm just saying not to boost until you know enough about it cuz you'll blow up something. Gezzzz...angry people these days..</TD></TR></TABLE>

that is the whole point to me posting this. It isn't like i already have a turbo on my car and am wondering how it works, i am trying to learn as much as i can so when i do feel i know enough and have enough money saved up, i can make the right decisions.

 

the BOV has a spring holding the plunger closed, (the boost pressure wants to push it open) with a vacume source from the intake manifold pushing down on the top to assist the spring... when you are wideopen throttle in boost, the bov is closed, and when you let off the gas, the throttle plate closes, and therefore drops the pressure in the intake manifold, (also lowering the pressure holding the bov closed) this is when you hear the bov making noise it alows the pressure from the spinning turbo to release without damaging the throttle plate, or causing the compressor to slow down too fast... which, as stated above, is very hard on the turbo.... its like locking up your brakes every time you stop!!!