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Originally Posted by psfred
Anyway, the box is the flow meter for the engine controls (idle speed control, air recirc, EGR) found on these engines. It measures the air flow to switch the air recirc on and off, and I guess the EGR as well.
The air recirc valve appears to increase milage a bit on the highway by reducing boost (and hence fuel use) when you don't need it. EGR is another story,
You should not put a K&N fliter
Peter
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so the box controls the opening and closing of the EGR which is the same as the air recirc valve.
I dont think the opening and recirculation of exhaust gasses has much to do with increasing milage. at steady highway speeds boost pressure drops to about 3-4 psi with or without a workig egr system. touch the throttle and boost goes up.
My point in removing the box is to smooth the flow of air into the turbo intake.
there must be some resistance going through that box.
__________________
sold
1987 300 SDL 318K
126.125 (OM603.961) (722.321 trans) (head#14)
Born on date 11/07/1986
2.5" Flowmaster Exhaust
flex-a-lite dual electric cooling fan conversion
now have a 1985 toyota diesel pickup