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since this is my first post, i hope there are some answers out there. tried the search feature but was unsucessful.

i have a 1999 with very limited mods. no cat, very nice high flow exhaust and nothing else.

since we just got our AWD chassis dyno installed, i've had the chance to do several pulls.

the air fuel ratios are way too rich. well under 11.5 numerically at over 4500rpm.

how can i lean the motor out.

the fuel system unlike the na's is returnless with the regulator in the tank.

do you modify the regulator? somehow restrict the amount of voltage to the pump?

just looking to see how to do this with the factory fuel management in place.
 

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that's pretty much what the stock ecu is going to do after 4-5K. Put some some of resrictor on the vacuum line to the FPR to lower max fuel pressure, that should prove to lean it up a bit, but it shoudl be done on a dyno so you can see exactly what it's doing.
 
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