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View Full Version : Improving the airflow of the K-Jet Airbox

boostdemon
11-28-2003, 09:55 AM
By: Jon Glommen

Description: The B21FT used the same airbox throughout it's 6 year lifecycle: 1981 through 1985. The airbox sits beneath the fuel distributor and quietly supplies filtered air to the metering valve en route to the turbo compressor. The oval filter is comparatively large; at 50 square centimeters of surface area it is able to supply over 1980 cfm or air --enough for over 400 hp.

http://www.turbobricks.com/mods.php?content=art0003
Jordan
10-01-2005, 10:12 PM
I have what may be a stupid question.

After you make a custom pipe to the air box, eliminating the diverter valve. Where does the pre-heat tube go? I know I am missing somthing.
volvogeek
10-01-2005, 10:54 PM
I have what may be a stupid question.

After you make a custom pipe to the air box, eliminating the diverter valve. Where does the pre-heat tube go? I know I am missing somthing.
That depends on how anal your emissions inspectors are. If not very, just remove it AND the heat shield on your exhaust manifold. If they look to make sure everything is there, just tuck it up underneath so that it looks stock.
Jordan
10-01-2005, 11:00 PM
Ok, maybe I am misunderstanding the purpose of the preheat hose. it directs hot air from the turbo into the air box? so if i remove it i'll have hot air spewing out of a hole in my engine undirected? if so, does that cause a problem? and why would the heat shield be removed.

i am sorry for all these questions, but my mom is cautious of me moddifying anything. i have to explain it in detail to her.
volvogeek
10-01-2005, 11:28 PM
The preheat hose directs hot air coming OFF of the manifold into the intake stream - not hot air from the turbo. It improves emissions, but you don't really want hot air coming into the turbo, because cooler air = better. And if you have a 740 Turbo, that flap will then direct your hot air through your AMM, which can lead to premature failure of a rather expensive part.
Jordan
10-01-2005, 11:45 PM
ok cool. i talked to another bricker on AIM and he helped me out with it. thanks volvogeek for your help as well:)
Brickster151
10-02-2005, 06:02 AM
ok cool. i talked to another bricker on AIM and he helped me out with it. thanks volvogeek for your help as well:)

Glad I was able to help ya too.

Like I said, if you're emission inspections check for that stuff, hold onto it and put it back on come inspection time
Jordan
10-02-2005, 02:54 PM
Glad I was able to help ya too.

Like I said, if you're emission inspections check for that stuff, hold onto it and put it back on come inspection time

Will do man. Will do. Thanks again. I just gotta wait for the rain to stop so I can do this mod already.

Have you noticed any improvments after you did it? Like responsivness, more power?