Also how do you keep the pulley from rubbing on the bracket? I see Avengeance has a slight gap between the edge of the pulley and the bracket, how is this achieved?
As Chad already mentioned... washers. As you can see from my pics I stuck it too close one time, apparently when I nailed the pedal it did tweak it just enough to scrape the bracket. Fixed it with the addition of a extra washer.
edit... now that I think of it it scraped right around the time the bearings in that idler went out, might have been that too.
__________________ ----------|02 35th Ann. Limited Edition SS A4 T-top.|-----------
----------651rwhp/558rwtq. (11.4@128mph. 2.0 60')----------
-------------Tuned by Rick @ Synergy Motorsports-------------- |Procharger D1SC|FMIC|Circle D 4C|Custom Cam|6.0L Heads|Moser 9"|FLT 4L80E|
Last edited by Avengeance; 10-26-2009 at 11:09 AM..
So technically the 0.59" diameter section is not necessary?
The step down is not so much required, but the spacer is very necessary. You don't want the pulley walking forward any and contacting the bracket. I just had that section at the end machined down to accommodate a common washer size that I was able to pick up at Lowes for cheap. If you wanted to have a custom spacer machined, or could find an oddball washer that will fit over the .668 section and still have an OD that will fit inside the pulley, then no, you don't have to machine down the end like that.
__________________ 2002 Trans Am M6, forged 9.2:1 370, F1 procharger @ 12psi, comp SC2 cam, mild ported AFR 225 heads, MAC midlengths, Borla, full suspension, 3.73 12-bolt, Mecham Hood, 19x10 Polished CCW 505A's 700ish RWHP/ 600ish RWTQ (still ironing it out)
The step down is not so much required, but the spacer is very necessary. You don't want the pulley walking forward any and contacting the bracket. I just had that section at the end machined down to accommodate a common washer size that I was able to pick up at Lowes for cheap. If you wanted to have a custom spacer machined, or could find an oddball washer that will fit over the .668 section and still have an OD that will fit inside the pulley, then no, you don't have to machine down the end like that.
I almost posted that I figured you did it for the washers to fit but wasnt sure enough to say that, LOL.
__________________
1999 Trans Am Ws6 6-speed--12.9 @ 108.7 w/2.1 60' (street tires)(before H/C/I no new times yet) MODS: MTI Lid--Hooker Muffler--Pacesetter 1 3/4" race LT's--TSP 3" ORY--LS7 clutch kit--LS2 flywheel--224/.581 114--5.3 Bo White heads port/polished & milled .018"--Bo White port/polished TB--Patriot Gold dual spring kit--7.4 TR chromemoly pushrods
LOL apparently I'm not the first one to do this mod. I'm just the first one to bring it to light. Guess we had all these other guys hiding it tryin to keep it to themselves
__________________ 2002 Trans Am M6, forged 9.2:1 370, F1 procharger @ 12psi, comp SC2 cam, mild ported AFR 225 heads, MAC midlengths, Borla, full suspension, 3.73 12-bolt, Mecham Hood, 19x10 Polished CCW 505A's 700ish RWHP/ 600ish RWTQ (still ironing it out)
LOL apparently I'm not the first one to do this mod. I'm just the first one to bring it to light. Guess we had all these other guys hiding it tryin to keep it to themselves
lol.... I wish I had known that Procharger didnt start producing them. I would have shared this stuff long ago.
I went and looked at my photos.. I took this pic in March 05. A lot has changed since then.
__________________ ----------|02 35th Ann. Limited Edition SS A4 T-top.|-----------
----------651rwhp/558rwtq. (11.4@128mph. 2.0 60')----------
-------------Tuned by Rick @ Synergy Motorsports-------------- |Procharger D1SC|FMIC|Circle D 4C|Custom Cam|6.0L Heads|Moser 9"|FLT 4L80E|
lol.... I wish I had known that Procharger didnt start producing them. I would have shared this stuff long ago.
I went and looked at my photos.. I took this pic in March 05. A lot has changed since then.
That explains why mine had the extra idler and stand-off when I upgraded to an 8 rib set-up. No instructions on how to install the extra idler or any talk of it. I had to mock it up, mod it up myself and make the best of it, lol.
You may find yourself running into belt size problems on this set-up though depending on what size pulleys you are running. I had no issues with a 3.7" BP/ 7.65" CP. Gates made a belt that fit perfectly (K080415 i think) and tightening the belt left a perfect gap between the two idlers with room to tighten more. Once I stepped down to a 3.55" BP, things got a little trickier. The K080415 belt had to be tightened all the way to where both idlers where almost touching each other to get the proper tension. You couldn't squeeze a piece of paper between the idlers they were so close together.
Moving to the next smaller sized belt K080408 didn't work. The belt was too short to install. A 3.4" BP would've been the only other option or a custom belt. All in all though, this mod is definitely worth it 100%.
__________________ .
Quote:
Originally Posted by Jake@EPP
Some claim 600ish on stock bottom end, but i think those people have short blocks laying around, at that power level its like walking around with a torch in a firework store
01' SS M6 Hard-Top 1SC Stripper. Procharged F1A 370
Your best bet here is probably going to be the 2.5/2.5 setup because gates makes a 40.0" belt
Quote:
Originally Posted by SilverSS
You may find yourself running into belt size problems on this set-up though depending on what size pulleys you are running.
Very true. The adjustment range with this setup is very narrow, so your belt needs to be almost spot on. However, switching out idler pulleys between 2.5" and 3" can help a little bit.
Quote:
Originally Posted by SilverSS
I had no issues with a 3.7" BP/ 7.65" CP. Gates made a belt that fit perfectly (K080415 i think) and tightening the belt left a perfect gap between the two idlers with room to tighten more.
Man, thats awesome news! I'm planning to run a 3.7 pulley in the future, and you just verified my calculations were correct about a 41.5" belt fitting that application
Quote:
Originally Posted by SilverSS
Once I stepped down to a 3.55" BP, things got a little trickier. The K080415 belt had to be tightened all the way to where both idlers where almost touching each other to get the proper tension. You couldn't squeeze a piece of paper between the idlers they were so close together.
Moving to the next smaller sized belt K080408 didn't work. The belt was too short to install. A 3.4" BP would've been the only other option or a custom belt. All in all though, this mod is definitely worth it 100%.
You may try swapping out your procharger 2.5" idler for a 3" stock accessory idler like I am using and see if that works. I know by doing this, you lose a little bit of adjustment because of the bigger pulley, but it also will take up more belt length.. According to my calcs, a 7.65/3.55/2.5/2.5 like you have now would ideally require a 41.28" belt. With a 7.65/3.55/2.5/3.0 I'm coming up with a 41.56" belt. If I were you, I'd take the stock accessory idler off, then put it on your standoff and see how well it works with your 41.5" belt. I had to space the accessory idler out away from the hex by .1" to get it lined up with the belt, but see what works for you. Keep in mind that the stock accy idler is about the exact same width as an 8 rib belt, so its alignment needs to be pretty close. I used some wheel lug nut washers from my convo pro wheels which was a nice fit over the shaft part of the standoff and a small enough OD to still fit inside the pulley. I know they aren't really a commonly available part, but do whatever works. I am pretty sure that should help you out and create some more clearance between your pulleys. And for a $20 part at Oreilleys, a cheap easy solution.
If that doesn't work for you, you can go with a 3.4 blower pulley, and a 7.25 crank pulley and use a 40" belt with a 2.5 idler and 2.5 tensioner as I posted the sizes above for Ricky. A 7.25/3.4 combo is virtually the same ratio as a 7.65/3.55 combo. The 7.25 pulleys are common from the SDCE setups, and also I believe Vortech uses a 7.25 8 rib crank pulley. Hope this helps some.
__________________ 2002 Trans Am M6, forged 9.2:1 370, F1 procharger @ 12psi, comp SC2 cam, mild ported AFR 225 heads, MAC midlengths, Borla, full suspension, 3.73 12-bolt, Mecham Hood, 19x10 Polished CCW 505A's 700ish RWHP/ 600ish RWTQ (still ironing it out)
great man thanks but were would i get the 2.5/2.5 set up? im confused
edit never mind i got it now i just need to order a 2.5 idler from procharger right?
I'm trying to source the standoffs now. So far I've had virtually zero luck finding a source for a 19mm hex standoff with a M10x1.5 thread thats 75mm long. I can't find it in ANY material, much less stainless. I've only found one place so far that would do it, but they have a $500 minimum order. They would sell me 25 @ $20 each, or 100 @ $10 each. Needless to say I don't really have money on hand to invest in that many standoffs. I need to get the material before I can get a quote from the machine shop to machine it. Heck, if I could find even an unthreaded standoff with just a smaller hole in it than is required, I could have it tapped with the correct thread size, thats not a huge deal, but I can't even find that out there. Even a 3/4" standoff 3" long with a thru hole smaller than 3/8" could work for that proceedure, but can't find those either.
Only other solution I could come up with is to get a group of 10 or so guys to ship me their aluminum standoffs, and I can have them all machined at the same time, but I'm not sure too many people would be willing to do that. Maybe now is a good time since its winter but everyone would have to coordinate to get their standoffs shipped at the same time to keep cost down. If machined individually, I'm sure it would cost a little more, but at that point, people may as well just have their own local machine shop do it for them... So I dunno..
__________________ 2002 Trans Am M6, forged 9.2:1 370, F1 procharger @ 12psi, comp SC2 cam, mild ported AFR 225 heads, MAC midlengths, Borla, full suspension, 3.73 12-bolt, Mecham Hood, 19x10 Polished CCW 505A's 700ish RWHP/ 600ish RWTQ (still ironing it out)
I'm trying to source the standoffs now. So far I've had virtually zero luck finding a source for a 19mm hex standoff with a M10x1.5 thread thats 75mm long. I can't find it in ANY material, much less stainless. I've only found one place so far that would do it, but they have a $500 minimum order. They would sell me 25 @ $20 each, or 100 @ $10 each. Needless to say I don't really have money on hand to invest in that many standoffs. I need to get the material before I can get a quote from the machine shop to machine it. Heck, if I could find even an unthreaded standoff with just a smaller hole in it than is required, I could have it tapped with the correct thread size, thats not a huge deal, but I can't even find that out there. Even a 3/4" standoff 3" long with a thru hole smaller than 3/8" could work for that proceedure, but can't find those either.
Only other solution I could come up with is to get a group of 10 or so guys to ship me their aluminum standoffs, and I can have them all machined at the same time, but I'm not sure too many people would be willing to do that. Maybe now is a good time since its winter but everyone would have to coordinate to get their standoffs shipped at the same time to keep cost down. If machined individually, I'm sure it would cost a little more, but at that point, people may as well just have their own local machine shop do it for them... So I dunno..
I did this my self several years ago had a extra idler pulley so had a stand off machined down works great! anyone who would like this done just drop me a PM and i can do it for them.
also if you do this you no longer have to take the blower off to change the belt.
I did this my self several years ago had a extra idler pulley so had a stand off machined down works great! anyone who would like this done just drop me a PM and i can do it for them.
also if you do this you no longer have to take the blower off to change the belt.
Afterall, this is the poor man's method of going about it 
I'm planning to run a 3.7 pulley in the future, and you just verified my calculations were correct about a 41.5" belt fitting that application 
