You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
I have wanted to add a different pulley to get more than the factory 8lbs of boost. I have heard of a #4 and a #6 pulley. How much more boost do you actually get by doing so? Do you have to replace the belt afterwards or use the same one. I live about 3 hours from Saskatoon which is the closest svt dealer and where I bought the truck from. I just thought I would ask other lightning owners or people who have done the pulley change themselves.
Well, with the 4lb pulley you get about 6lbs of more boost, and with the 6lb pulley you get about 4lbs of more boost. Just kidding bro!
With a 4lb'r, you get 4 more pounds of boost. With a 6lb'r, you get 6 more pounds of boost.
No, you need a new belt with the different sized pulley's.
You'll want to get a custom tune for your truck (dyno tune is better than email or canned tunes) to optimize the performance for whichever pulley you decide to go with.
With the 4lb pulley, you can run the truck without a tune (I did for over a month before I got my custom tune) but it's not advisable.
I wouldn't even think of running a 6lbr without a tune. It's not safe at all.
Stewart
__________________ The Brotherhood of FTE <-click the link 1999 F150 Lightning: WMS built block, 6lb lower, Monsterbox, Truetrac, CF driveshaft 1999 PSD F250 SC 4x4: 38R, Stage 2's, T-500, JW trans, Live Tuned, lotsa Riffraff stuff 2000 PSD Excursion 4x4: 38R, JW trans, F5, MBRP, AFE, OBA and Pre-Pump, V & B codes Never Fry Bacon NAKED!
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.
Just kidding bro! 
