old motorhead

iTrader: (10)

Just got done installing my front drive TVS2300 in place of the MP122. I have a 3.4" pulley now and am seeing 8psi. How far can I pulley down before getting into belt slip? I want as much as possible without fooling with more ribs. My MP122 would do 9psi with a 2.6" pulley and had no slip.

Motor is a forged HKE 6.0L LQ4. Livernois stage2 ported 243 heads with 215/227 .603/.613 116LSA blower cam. The motor will take it. I did do a search. If this has been beaten to death, please direct me to the thread(s). Help appreciated.

Also, any idea what my MP122 head unit is worth? Just the charger and three pulleys...no injectors. Has about 30,000 miles on it. It was running great when removed. It would get into boost way quicker than the 2300. You could go from 16" of vacuum to 6psi of boost by just tapping the go pedal.

1slow01Z71

iTrader: (36)

Talk with joe from leftcoast, he has the RIP grooved pullies like riechard does for the prochargers. Hes about the most knowledgeable as far as pushing the pulley systems.

03sierraslt

iTrader: (22)

I got a RIP pulley also for mine, I have had mine up to 10psi so far. I spoke with Joe concerning the same issue and he said he felt I would start having belt slip once I got to 11psi or so. At 10psi I had Zero belt slip judging by my HPT scans, Map KPA stayed dead solid at WO. If there was any tip in slip I couldnt tell. Are you running the Belt # that I gave you? Reason I ask is once I go lower then a 3.3 i think I may go with a hair shorter belt to try to keep my tensioner in the middle of its travel range.

old motorhead

iTrader: (10)

Actually, that belt was way too short to use. Even with the adj idler all the way up, there was no way to get in on. We must have differences in the drives. I tried to get a 3.3" pulley from Maggie, but I guess my blower had already been boxed and they couldn't (or wouldn't) change it. Do you think I should try a 3.2"? Is each tenth of an inch worth about 1 psi?

EVILGMC

iTrader: (47)

i had slip at about 10psi.

if you do decide to go with a RIP pulley, be sure to upgrade to the Gates HD (green) belt.

now i am at 15psi. 8 rib 2.8-RIP 10%OD crank. front inlet front drive.

old motorhead

iTrader: (10)

Did it slip with the RIP pulley or the stocker? What size pulley was it?

If my math is right, you're turning it almost 18,000 rpm at 6000 motor rpm. I'm guessing that's enough air to break lots of stuff With a 3.2" pulley, mine will be loafing along at about 14K blower rpm. That should be enough for me for a while....maybe.

EVILGMC

iTrader: (47)

i shift at 6300...haha...its spinnin nice and fast.

i had slip with a stock steel 6 rib. it was 3.2 iirc.

i had a 2.8 on my 1900 at 8psi and had no issues.

Preston129

iTrader: (3)

Is there a worthwhile benefit to putting an 8-rib just on the blower snout and leaving the rest 6-rib? Say for example the 6 rib starts slipping at 8psi, if you put on an 8-rib with the 6-rib green belt would be able to get 10psi out of it then?

03sierraslt

iTrader: (22)

No differance, still only a 6 rib belt spinning it.

03sierraslt

iTrader: (22)

I would expect that a 6 rib RIP pulley and green belt would give me 11-12 before I see slip. I need to find the HD green belts, anyone know where they can be had?