Technical > Spud Miller's Cave

HI SPEED LEAN OUT--DO I NEED ONE?

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dusterdave173:
ok...new car 355 SBC, enderle pump, Hilborn stack on alky--everything is running great! Car starts easy, idles as good as any stack, runs same et almost every pass--running mid 5's in the 1/8th All Good!! I am not running a high speed lean out--Should I run one--do I need one?? How much will it help?? I like leaving well enough alone but...don't want to leave any big gain on the table--run 1/4 pretty rare--mostly 1/8th
Car runs cool as a cuke--can even drive it back if i don't play around--so i am guessing it is on the fat side
Just knocking some of the plating off NGK plugs around the ends--not up on the threads any
what to do? how to go about setting it and checking it--dialing it in ??
THANKS!!

Spud Miller:

 Give this a read and see what you think...

 http://www.fuelinjectionent.com/highspeedheroics.php

 Spud

afuelcoupe:
short answer no you dont need one and would be better off without it.....

slingshot383:
Frank would say no, but that you would have a driver operated lean-out for that top end push to take the stripe.  If you are running a combination where you are launching at 6500 rpm or more, you would already be on the Hi-speed in most cases.

wideopen231:
With most setups its not really needed.  Leaving around 6000 and shifting in mid 7000's your system will be  in narrow pressure range.It would be open full time so basically just same as basic system. A manual can be effective for little extra on topend,but only if system is little rich to start.Plus its not going to make a big jump like say a nitrous system would.

I have one designed into my system ,but its for building heat before run. Also have richening effect for cooling it and one for enrichment for nitrous setup at later date.

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