What the heck? Identify this part....

[QuickWE4]

Hey all....

I was surfing around on ebay and came across an auction for an87 GN. Follow the link below and bring up the pic of the engine bay. Take a look at the MAF pipe....what the hell is that tube that appears to be welded to the MAF pipe just upstream of the MAF sensor? Can't figure it out.

Just curious -

Rich

Here's the link:

http://cgi.ebay.com/ebaymotors/ws/e...7175449&t=0&r=0&indexURL=4&photoDisplayType=2

 

[zam70]

looks like the intake return for a blow off valve.

 

[CaPPY]

That's what I thought...BOV!

 

[QuickWE4]

Ok, so the BOV discharges back into the intake stream.

I thought, typically, a BOV would vent to the atmosphere.

Oh well, learning new things all the time

Thanks guys...

Rich

 

[FlyinGN]

Thats where my old DSM (Talon) turbo's bov air went.. Back into the intake.. It has to be a closed system to be emissions legal.. Thats maybe why he did this.. OR maybe he was not fond of the Cheesy ricer BOV sounds.

Originally posted by QuickWE4
Ok, so the BOV discharges back into the intake stream.

I thought, typically, a BOV would vent to the atmosphere.

Oh well, learning new things all the time

Thanks guys...

Rich

 

[RealFastV6]

Originally posted by FlyinGN
Thats where my old DSM (Talon) turbo's bov air went.. Back into the intake.. It has to be a closed system to be emissions legal.. Thats maybe why he did this.. OR maybe he was not fond of the Cheesy ricer BOV sounds.

Its not so much to stay emissions legal, as its just for the computer.

The air vented out the blow off valve has already been metered by the Mass Air Flow sensor, so it's better to vent it back into the intake after the MAF. Otherwise, the computer will be doing silly things like going rich and trying to correct for it and such.

On a Speed Density System it wouldn't matter.

 

[QuickWE4]

Got it.

Thanks for the input guys!

Rich

 

[Turbo-T Wannbe]

Also, dumping it back into the intake helps keep the turbo spooled up. Helpful for the manual trans. imports.