Radix 112

[CenWaSS]

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?

[brobradh77]

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

[CenWaSS]

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

[CenWaSS]

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).

[SSThunder]

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.

[Jaymz]

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 !!!!!!

[moog5050]

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?

[Black2003SS]

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.