If I recall it was like 2-2.5psi

 

Is there any calculation I can use to figure out how much it will increase my boost?

 

Not exactly... but you can figure out what the equivalent upper pulley would be with the stock balancer if that helps you at all.

just divide the upper pulley by 1.1.

Example if you're using a 3.0 pulley now it will be like a 2.725" after the OD crank. The rule of thumb is approx 1# per .1" pulley drop with a maggie.

3.0/1.1 = 2.727

 

Makes sense.

Im at 8.5-9 lbs with 2.95 upper and 7.72 crank. So 2.95/1.1 = 2.68.

So a increase of about 3 lbs

Thanks!

 

When you did the overdrive pully did you switch every thing to 8 groove or did you run the 6 groove

 

I ran 6 rib for a little while, 5-6m then switched it to 8 rib.

 

When you switched did you returned the truck or will the computer compensate for the change

 

From 6-8rib? Or to the overdrive crank pulley?

 

To the overdrive

 

Yes you have to retune, if you add boost you have to retune period.