Gtm Supercharger pulley discussion

Jinxx

I run with a 85mm on a stage 2 supercharger and it maxes out the supercharger at about 7.1k rpm .....I think the stage one supercharger can handle the 84..better but I'm not sure ...the 88mm is best matched to max out your supercharger at your 7500rpm ....the issue I had with my fuel system was fuel pressure drop and starvation at higher rpm larger injectors would magnify the pressure drop and I didn't want to risk the motor on what I felt was a unstable setup ..even tho some do run stock fuel system over 500 whp..I just felt safer...there is always a risk of popping the engine ...but greater risk if fuel system is at its limits ....and yes you can set limiter down lower depends on if you want to redline your car or not ..using the 84mm or the 85 mm I wouldn't run past 7k very often ..but that's my opinion .....with the 85mm on the stage 2 I got 523whp and 395 torque...if you want more torque ..it would be safer to go turbo IMO..

Another option would be to upgrade fuel system with e85 ....that would get you more hp and torque and maximize output ...if e85 is available near you

jmroy6

Im running the 85mm pulley on my stage 1 kit. I rev to 7.5k almost everytime i drive it with no issues to date, granted i upgraded to a 25row oil cooler to help cool the sc from the added heat. If you want more peak torque i would throw the stock cats on if they arent already, or run a smaller pulley for more boost.

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2012 370z GTM SC

Jinxx

With 85mm pulley you are over spinning the supercharger specs at about 7k .... I wouldn't recommend going smaller and running to 7.5k that is a sure way to pop a motor or blow the supercharger... and the the oil cooler upgrade isn't gonna help overspinning or over boosting .... stock cats will increase torque and hp due to not losing boost pressure through the exhaust valves

kentmo280z

Fuel starvation is what I'm concerned about. So, I'm trying to find an 88mm pulley and not have that issue. No luck so far.
What bothers me about the 1.5 upgrade is that my torque went down. Thus , the thought about using a smaller pulley.