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View Full Version : How should I OD my MPII?



tydlwavs
01-14-2009, 04:13 PM
I have a couple options here and I want opinions on the best way to OD the SC. It already has the 10% sc pulley, but I know it's a better option to run the jackshaft OD pulley to keep belt slip at a minimum. Engine is stock with 86k miles. It's a junkyard 95 motor with new bearings and seals.

I have the MP springs, catless exhaust, K&N intake mod, underdrives, stock 36's for now with stock 94/95 plenum, MP FMIC. Any info is appreciated. Car will obviously need injectors and the inlet plenum. That's next on the list.

nickleman60
01-14-2009, 06:00 PM
Depends on how much od you want. For 10% od I say the best with the least slip is a 10% crank pulley.

tydlwavs
01-14-2009, 06:04 PM
I have underdrives.

ScrapSC
01-14-2009, 06:08 PM
Pitch the underdrives and run the OD Crank and Jackshaft with a stock supercharger pulley. I didnt see much help at all from the underdrives and with trying to keep belt slip at a minimum you want to have as much contact as possible on the SC pulley. Just my two cents.

fturner
01-14-2009, 06:09 PM
Personally, 5% SC and 5% jackshaft.

Fraser

Melon
01-14-2009, 06:18 PM
Personally, 5% SC and 5% jackshaft.

Fraser

That's what I did. On the dyno, I was starting to have a bit of belt slip towards the end, but I think if I had the MP springs - I wouldn't have had the slip.

-Melon

rzimmerl
01-14-2009, 10:28 PM
Run 15%, 5 on the SC and 10 on the JS, and keep the UD's. I ran the MP 10 rib 15% kit on mine and made 265rwhp on a stock block.

tydlwavs
01-14-2009, 10:41 PM
I'd like to stick with 5-10% OD on the blower.

-Todd

David Neibert
01-15-2009, 12:27 AM
Overdriving with the crank pully and jackshaft is best, because it increases the surface area for the supercharger belts to grip.

David

tydlwavs
01-15-2009, 10:01 PM
I was told that the 10% SCI jackshaft overdrives the crank 5% and the blower 5%. Is that true? Just want to verify this.

David Neibert
01-16-2009, 02:09 PM
I was told that the 10% SCI jackshaft overdrives the crank 5% and the blower 5%. Is that true? Just want to verify this.

Todd,

The overdrive on my ESM 10% jackshaft pulley is all on the supercharger belt side (it's 10% larger OD). The portion that is driven from the crankshaft pulley is the same diameter as stock and still uses a stock belt.

Don't know anything about how SCI does it.

David

tydlwavs
01-16-2009, 02:18 PM
I can't get to the search function for some reason. I'll have to ask Ryan. I do have MP springs and I'm lookin pretty hard at the 94/95 pulley and a 10% jackshaft pulley so I am not quite running a full 10% OD. I'll see if my 5% belt fits this set-up.

Just waiting on payment for my 5% and the 10% sc pulley to make my purchase later today.

pearl95sc
01-19-2009, 12:02 AM
Personally, 5% SC and 5% jackshaft.

Fraser

I got the same thing goin on. No complaints.