graniger question

[Beachbum3478]

ok that makes sense after looking at the diagrams. thanks.

[shadow t2]

Quote:

Originally Posted by Beachbum3478 one last question, i was looking the diagram on gus mahons site, and it shows that the vac line doesnt even go to map sensor anymore, it just loops from the turbocharger nipple then to the wastegate acutator, with the g valve in the middle, so how will the map sensor know how much psi the car is running?

The stock computer has preset parameters to figure the a/f ratio at part throttle, semi full & full throttle. You can actually watch this on an air/fuel ratio guage. The stock computer adjusts the pulse width of the injectors according to the info it recieves. Once the map sensor sees more boost(mine goes in at about 5 psi) the computer detects this & adjusts the pulse width accordingly. Then when the computer sees WOT according to map sensor voltage(boost) & throttle position sensor voltage, then the computer goes a step further to adjust the pulse width. You can go well above 14 psi with an adjustable fuel pres regulator, or possibly larger injectors, or a 5th & 6th injector. You can do this with the stock computer as I have, but you'll have to install a cutout raiser for anything above 14psi, piece of cake! My stock t2 injectors/stock fuel pump/stock t1 computer/basically stock everything with the exception of the adjustable fuel pressure regulator I made from the stocker are handling 17-18psi WITH NO PROBLEMS. I only needed to add fuel when I went above 15psi. Get yourself an air/fuel ratio guage, & be sure to read your plugs, add 1-2psi of boost at a time.

[firebaron90]

That vac line dhould be for the in airbox BOV. You should read up on this thread:

Installing a Vacuum Block

I woul re do the vac lines with one of these.

Joe

[Beachbum3478]

well when i put a stock t2 intercooler in my car, i also put the T2 airbox in, which elimanted the bov in the airbox. but the T1 box also had the vac line im talking about along with the bov line next to it. ill try to find a picture.

[Beachbum3478]

here is the vacuum line that im talking about, its connected to the airbox right under upper intercooler hose. so i need to kno if its bad not have it hooked it up to the airbox anymore. right now it is just plugged.

[shadow t2]

Quote:

Originally Posted by Beachbum3478 here is the vacuum line that im talking about, its connected to the airbox right under upper intercooler hose. so i need to kno if its bad not have it hooked it up to the airbox anymore. right now it is just plugged.

Unplugged mine, plugged off the vac source it went to, no problems. I think one went to the cruise control, other to turbo compressor hsg, maybe one to power brakes, can't remember. I outgrew the stock airbox & went with a K&N as you probably will as well, which that line will be eliminated anyway.

[Beachbum3478]

yea thats the one im talking about, but the reason im asking is ever since i plugged that end up, my BOV hesitates to go off, and the turbo backspools for a spilt second then the BOV goes off. should i just figure out how to plug it back in to my cone filter intake now along with my pcv tube?

[shadow t2]

Quote:

Originally Posted by Beachbum3478 yea thats the one im talking about, but the reason im asking is ever since i plugged that end up, my BOV hesitates to go off, and the turbo backspools for a spilt second then the BOV goes off. should i just figure out how to plug it back in to my cone filter intake now along with my pcv tube?

Where is your BOV plumbed in at? T1 was in the airbox, T2 had no BOV. I would ditch the stock airbox, run a strait piece of 2 1/4" exhaust pipe on the upper in its place, plumb the BOV in there. I'm not even running a BOV right now, but one's in the near future. Use a K&N in the stockers place.

[Beachbum3478]

well thats what i did, first i had a stock t1, then added an intercooler, and added the stock t2, now i got rid of the t2 airbox and put the bov on a metal pipe in its place.

[Beachbum3478]

i think my boost went down when i plugged the vac line. could that be possibel since that line is connected to a turbo compressor nipple.

[Beachbum3478]

any thoughts on why my boost went down when i plugged the vaccuml line that went into my T2 airbox. on the inside of the airbox, there is just a little vent hole that the vacuum line would use. so could i just un plug it and let hang in the engine bay. i guess it would be the same thing except the vacuum, or whatever it is, be inside the airbox.