CenWaSS Posted April 22, 2009 Report Share Posted April 22, 2009 I am currently running a 3.0 pulley and making 6lbs of boost. I do have a 2.75 pulley and am considering putting it on but was curious how much things would change with regards to drivability and of course how much more boost could I expect? Quote Link to comment Share on other sites More sharing options...
brobradh77 Posted April 22, 2009 Report Share Posted April 22, 2009 got this from Zippy a while back all depends on your mods etc...I run a 2.8 and only see about 7.5-8#'s Pulley size -Belt Size -Boost psi.(apx.) - Goodyear# - Gates# 2.75" Pulley = 111.0 " Belt = 9 to 10 psi. - P/N=4061110 - P/N=K061110 2.8" Pulley = 111.0 " Belt = 8.5 to 9 psi - P/N=4061110 - P/N=K061110 2.9" Pulley = 111.5 " Belt = 7.5 to 8 psi. - P/N=4061115 - P/N=K061115 3.0" Pulley = 111.5 " Belt = 7.0-7.5 psi. - P/N=4061115 - P/N=K061115 3.1" Pulley = 112.0 " Belt = ---6--- psi. - P/N=4061120 - P/N=K061120 3.3" Pulley = 112.0 " Belt = 5 to 6.5 psi. - P/N = 4061120 - P/N=K061120 Quote Link to comment Share on other sites More sharing options...
CenWaSS Posted April 23, 2009 Author Report Share Posted April 23, 2009 got this from Zippy a while back all depends on your mods etc...I run a 2.8 and only see about 7.5-8#'s Pulley size -Belt Size -Boost psi.(apx.) - Goodyear# - Gates# 2.75" Pulley = 111.0 " Belt = 9 to 10 psi. - P/N=4061110 - P/N=K061110 2.8" Pulley = 111.0 " Belt = 8.5 to 9 psi - P/N=4061110 - P/N=K061110 2.9" Pulley = 111.5 " Belt = 7.5 to 8 psi. - P/N=4061115 - P/N=K061115 3.0" Pulley = 111.5 " Belt = 7.0-7.5 psi. - P/N=4061115 - P/N=K061115 3.1" Pulley = 112.0 " Belt = ---6--- psi. - P/N=4061120 - P/N=K061120 3.3" Pulley = 112.0 " Belt = 5 to 6.5 psi. - P/N = 4061120 - P/N=K061120 Great info, just what I was looking for Quote Link to comment Share on other sites More sharing options...
CenWaSS Posted April 23, 2009 Author Report Share Posted April 23, 2009 If I go with the 2.75 pulley, looks I could be in the 9-10lbs range. Would that amount of boost be ok on the LQ9, I have no internal engine work...basicall all bolt ons (see sig). Quote Link to comment Share on other sites More sharing options...
SSThunder Posted April 23, 2009 Report Share Posted April 23, 2009 If you go below the 3.0, you're going to need a built trans sooner or later. That's kept me from going any lower than the 3.0 and I see 7 lbs of boost right now. Quote Link to comment Share on other sites More sharing options...
Jaymz Posted April 23, 2009 Report Share Posted April 23, 2009 got this from Zippy a while back all depends on your mods etc...I run a 2.8 and only see about 7.5-8#'s Pulley size -Belt Size -Boost psi.(apx.) - Goodyear# - Gates# 2.75" Pulley = 111.0 " Belt = 9 to 10 psi. - P/N=4061110 - P/N=K061110 2.8" Pulley = 111.0 " Belt = 8.5 to 9 psi - P/N=4061110 - P/N=K061110 2.9" Pulley = 111.5 " Belt = 7.5 to 8 psi. - P/N=4061115 - P/N=K061115 3.0" Pulley = 111.5 " Belt = 7.0-7.5 psi. - P/N=4061115 - P/N=K061115 3.1" Pulley = 112.0 " Belt = ---6--- psi. - P/N=4061120 - P/N=K061120 3.3" Pulley = 112.0 " Belt = 5 to 6.5 psi. - P/N = 4061120 - P/N=K061120 This should be a sticky !!!!!! Quote Link to comment Share on other sites More sharing options...
moog5050 Posted April 24, 2009 Report Share Posted April 24, 2009 As I recall, most who have tried believe that 2.8 is as low as you can go without significant heat problems. Maybe with Meth? Quote Link to comment Share on other sites More sharing options...
Black2003SS Posted April 24, 2009 Report Share Posted April 24, 2009 As I recall, most who have tried believe that 2.8 is as low as you can go without significant heat problems. Maybe with Meth? Generally correct. Also, going below a 3.0" pulley will require upgraded fuel requirements, especially on a 2005 returnless system. You will most likely need larger injectors than what came with the radix kit. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.