[JP9]

Anyone have experience with running the 3.2 size Metco pulley? 1-1.5 PSI increase. Just a little bit smaller than stock 3.35 size. Just curious. Thanks in advance!

 

[WizzaVTX]

I and many others are running the 3.10 Metco with a 10% lower pulley

no issue with it from any experience I have had......makes the power go round and round

Mid-14 lbs of boost with my setup and tune on 93 fuel

 

[JP9]

I and many others are running the 3.10 Metco with a 10% lower pulley

no issue with it from any experience I have had......makes the power go round and round

Mid-14 lbs of boost with my setup and tune on 93 fuel

Nice! I wonder if just a 3.2 alone would be ok without a tune. Metco mentions on their website that people have done this

 

[WizzaVTX]

Have seen it written about from others doing it.

Doubt highly anyone would really notice and don't encourage it.

 

[JP9]

Yeah, probably not worth the chance. Will eventually go 2.5 with dual fuel pumps, injectors, e85 and a Dusterhoff tune.

 

[WizzaVTX]

Yeah, probably not worth the chance. Will eventually go 2.5 with dual fuel pumps, injectors, e85 and a Dusterhoff tune.

That is a pretty far stretch from 3.10 swap and likely a solid performer for the track...not sure about driveability....that is a very small pulley on top. Mine is not running E, and I don't honestly see it in my future. Might want to look into other strengthening items like ARP studs as well as other items to keep the setup cool.

 

[Spoolin]

May be a better option to just go with the Incognito lower pulley without pinning the crank and gain 2-2.5 psi. This will keep belt slip at bay and give a little more power.

 

[JP9]

That is a pretty far stretch from 3.10 swap and likely a solid performer for the track...not sure about driveability....that is a very small pulley on top. Mine is not running E, and I don't honestly see it in my future. Might want to look into other strengthening items like ARP studs as well as other items to keep the setup cool.

The 3.10 upper and 10% lower you’re running is the equivalent of a 2.75 upper by itself. The 2.50 plan I have would be a ‘strictly track’ setup, and plan to run a 2.75 by itself normally. So around your level. How do you like the difference it’s made?

 

[Guam_Guy]

The 3.10 upper and 10% lower you’re running is the equivalent of a 2.75 upper by itself. The 2.50 plan I have would be a ‘strictly track’ setup, and plan to run a 2.75 by itself normally. So around your level. How do you like the difference it’s made?

Is there somewhere I can see what combos give you? For example, 10% lower with 2.95 upper.

 

[JP9]

Is there somewhere I can see what combos give you? For example, 10% lower with 2.95 upper.

Is there somewhere I can see what combos give you? For example, 10% lower with 2.95 upper.

Here are a couple charts: the images just show safe RPM levels based on pulley setups, but can give you a relative idea comparatively.

Pulley's vs boost

How much boost will each pulley make? 2.85 upper 10% overdrive ati crank pulley 9% innovators west crank pulley Would I need to change injectors for these? Would stock demons injectors be sufficient? Thanks

www.hellcat.org

 

[Guam_Guy]

Thank you for the charts!