Missing Link or check valve Options

[southwest2118]

i've reading about this missing link or something... what is it? what dose it do? where dose it go do i need it running 5psi?

[lagos]

its just a check valve and a ghetto way of tricking the map sensor. do it right and get the correct map sensor.

[southwest2118]

whats the correct map sensor for a 7AFE? is it plug and play?



with check valves won't you have a leak when boosting or is it so minimal performance is not effected?

This post has been edited by southwest2118: Feb 5, 2006 - 3:45 PM

[lagos]

whats the correct map sensor for a 7AFE? is it plug and play?



with check valves won't you have a leak when boosting or is it so minimal performance is not effected?

im guessing you could just use a 3sgte map sensor like the 5sfe guys do... but i never worked on an ST, so maybe somone else can privide info on that.

a check valve, is a valve that opens one way but not the other. the idea is that it will let your car see vac but not boost. seeing as how the motor relies on the map sensor for all its fuling calculation, fooling it with a valve is a bad idea.

[Dr_Tweak]

Unless, of course, you're using an FMU for fuel.

Not that I recommend that or anything, just pointing it out.

-Doc

[southwest2118]

so Dr i wont need another map sensor if i put in a fmu but how dose that help the MS not see boost? or ??

[Dr_Tweak]

The FMU increases the fuel pressure, and thus fuel delivered, in relation to the boost pressure. It has nothing to do with the map sensor. It's to get about the right ratio of fuel to air so that you do'nt go lean.

It's a very reliable system that's been used for many many years on high quality aftermarket turbo kits. However, with inexpensive piggyback computers and wideband air/fuel ratio meters now on the market, for a little more money you can actually tune the engine so that it runs just right... vs the FMU setup where it's "about" right.

-Doc

[lagos]

you still have to install a map sensor, because the stock one will fuel cut the car as soon as it sees any boost.

[Dr_Tweak]

you still have to install a map sensor, because the stock one will fuel cut the car as soon as it sees any boost.

You mean with the piggyback? Actually, if you use larger injectors most stock map sensors will read some boost, and you just reduce the signal with the piggyback.

If you mean with the FMU, that's what the check valve is for

-Doc

This post has been edited by Dr_Tweak: Feb 6, 2006 - 2:52 AM