Supercharger and Timing

[tjh566]

My goal is 6psi, Cheap Hp, And a Neat project to work on, I know its gonna be alot of work, the fab work im getting my dad to help me with, he was a welder/fab for 20 years, and with a little time I think it will go together nicely.

About the crank pulley, I didnt know about the 8-rib and such like I said im new to all this supercharger stuff, What crank pulley do you sugggest and where did you get you pulley for you supercharger at?

 

[JimBowy]

I'd suggest you do more research before continuing. I'd look for a Vortech crank pulley with the 8-rib s/c pulley (somewhere around 7" diameter). You can find pullies for the M90s all over the web, I'd suggest you go to www.sccoa.com as the supercoupe guys have tons of information.

 

[tjh566]

do you have a 5% pulley or a 10% pulley on it?

 

[JimBowy]

do you have a 5% pulley or a 10% pulley on it?

neither, stop looking at the %'s and consider the actual diameter of the crank and the supercharger pulley.

M90 8-rib Pulley measures 2.43"
Supercharger 8-rib Crank Pulley measures 6.92" (note: this is not the same as the 6-rib accessory crank pulley)

 

[tjh566]

If the formula I found is correct your spinning that thing at 15662.55 RPM with you hit 5500 rpm in your car from what Ive read max safe is 14k rpm?? please correct me if im wrong.

 

[JimBowy]

If the formula I found is correct your spinning that thing at 15662.55 RPM with you hit 5500 rpm in your car from what Ive read max safe is 14k rpm?? please correct me if im wrong.

sort of, the blowers are rated at 14,000rpm - however the blowers are known to take up to 18,000rpm (again check with sccoa.com)
Eaton engineers will spin these things up all the time, they know what they can take

you planning on staying with 24lbs injectors? even the 3.8L supercoupes had 36lbs

 

[tjh566]

the FMU will help support my fuel needs for now by raising fuel pressure, will upgrade in the future

 

[JimBowy]

good luck with this project, i'll be surprised if it makes 260rwhp

 

[tjh566]

I probly got close to that now...