Fire67

iTrader: (3)

Ive never even messed with my pulley sizes before, as I was more than happy with the 10psi I got on the stock motor.

The new motor of course consumes more air, and boost is low with my current pulleys so its time to change them out.

1) Pulley diameter measurement = to valleys or ridges?
2) Anyone know the stock diameter of an LT1 Procharger 12 rib crank pulley?
Set was supposed to be pullied for 8psi, which gave 10 on stock motor.
3) How much cushion in engine or blower rpm would you recommend when "maxing" a D1-sc? If any at all...

Im sure I'll have more questions but the answers to these should get me well on my way.

TIA

-Justin

andereck

1) ridges

2) usually 7.65" - most kits part # DC009A-012. 7.00" DC009A-013 8.5" DC009A-009

3) 0 rpm, but 62,000 is the maximum.

Fire67

iTrader: (3)

So no one ever uses a margin of 'cushion' in blower rpms at all huh? I guess no one ever 'plans' to over rev anything either lol

Do you know the part # for the 7.65" pulley?
I cant remember all but I know the part number on the pulley says DCA009A-xxx

Thanks a bunch!!!

andereck

I didn't realize that was your question. The head unit is capable of running right up to the maximum rpm, however you figure your safety factor.


DC009A-012

You're welcome!

Fire67

iTrader: (3)

The part number was right there d'oh! I just miss read your reply, as you misread my question.. lol

My safety factor is this, the motor is capable of 7000rpms all day, but dont plan to spin more than 6500 and i'll set the rev limit there... So I'll figure the blower rpm based on a 7000rpm rev limit. Sounds like enough cushion to me!

andereck

Sounds good to me too.

Fire67

iTrader: (3)

Last question before ordering my pulley... And its a hypothetical(sp?)...

Imagine this were your hard earned money, youve been working on the setup for over a year, and you cant wait to get it to the track. Let alone all the people ragging on you to finish.

Would you get it tuned on the current pulleys, then swap pulleys later and returne?
-OR-
Would you just go ahead and pulley it up before going any further?

The only thing swaying me towards keeping at the current pulley setup temporarily is the intercooler situation. I currently have the older Twin setup... I want to upgrade, but cant run a FMIC due to the LT1 TA nose. And I have yet to see any IAT data on the couple/few setups Ive seen with single horizontal intercoolers. So If I pulley it up now, leaving the intercooler setup alone, I'll have to spray some meth/H20 to cool things down.