02-05-2001, 03:30 AM
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#1 (permalink)
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Non Member
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Join Date: Aug 2000
Location: Los Angeles, CA
Posts: 742
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Turning Up the Pump
I decided with the new injectors that I would also give it a little help with the pump buy twisting the screw. I got the plastic cover off, removed the entire screw, removed the collar, reinstalled the screw where I thought it should be and went for a ride. It was way too far in.  The sky turned black and the pyro raced the tach. But it was a fun ride at over 30 psi. So I turned the screw back in to where the stock idle was as Big Don suggested. I was out about 4 turns. It is now about 1.5 to 1.75 turns. The idle is about 150 higher than normal and the max EGT's on full acceleration are about 900-950 degrees pre-turbo. It will also pull until about 2600 RPM. My main concern is the no load speed. The book says, and my truck was, about 2900 RPM. At 4 turns it would go past 3500 RPM at about 2" of throttle and now goes to about 3300 RPM at the floor. Is there a way to bring this down to 2900 RPM again? I think I can turn the screw a little more but don't want the extra RPM's. The other question is how to get the idle down. I can't seem to get the wrench on the nut.
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90 W250, 5-speed, isspro gauges, 16 cm2, K&N, Borgeson shaft, JRE 3" exhaust, Banks Intercooler, Lucas injectors
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Linear Mode
