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Originally Posted by Jeff20B
I have a 5" SC that has a -7 pulley and it has always sucked; takes forever to get into boost, will only boost under high load conditions like going up a steep hill etc.
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you will def like the -10 better than the -7, with a -7 you were pulling maybe 5lbs of boost total they use that setup on a 22R toyota engine that can't handle alot of boost.
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It came like this from Atkins during the days when they were recommending 7" SCs for everything......probably an honest mistake on their part .... We also recieved the wrong length belt for the 5", sure enough. It is the correct belt for a 7" SC with a -7 pulley, but was way too long for a 5", even with a -7 pulley. I had to get a shorter gatorback, which stretched a little and caused the alt to need to be lifted to its maximum on the bracket, and it would still slip sometimes.
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I experimented with several different belt lengths including a little adj on the braket to get some more adj, my question would be which alt are you using these were more designed to go with the 84 and up style than the older bigger ones, Roaching belts was and is not uncommon for me, as long as I treat it good I have no problems I also started using a belt dressing for a little more grab, if I roach it I have to tighten the belt again as i just streched the hell out of it, the other thing is make sure you have the belt wrapped the right way, i had it wrong once, the system worked but i could not get enough tension, then found my problem went oh crap used the right belt and was ok.... You have to really reef on this sucker that belt is so tight for my application I can play a tune on it.
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My friend has a 7" SC in his REPU with a -8 pulley and it seems to have problems such as belt slipping even thought it's tight as heck, even while still in vacuum before it transitions from vacuum to boost; sounds like marbles rattling around in a coffee can
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DETONATION ALERT...... DETONATION ALERT, HE NEEDS TO ADJUST HIS TIMING AND MAKE SURE HIS MIXTURE IS RICH ENOUGH OR HE WILL POP THE ENGINE, THAT IS THE MARBLES SOUND. I am willing to bet that it does not make that sound if he is easy on it like about 1/2 throttle.... it also sounds to me that he is really hammering it that is more than anything what causes the belts to do that, not really shavings but is dust
look familiar? (this is the 7inch look at all the belt dust )
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He also has a 5" SC with a -10 pulley in a rotary converted 510. He doesn't like how quickly the boost kicks in and would like to try a -8. I'm not going to argue with that because it means I'll be able to get his -10 pulley and a good used belt.
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Now that sounds like the 5" that I am used to they spool fast, i am willing to bet that he has something like 4.11 rear gears and a close ratio tranny as well the reason, the engine spools so fast you almost can't shift fast enough and it doesn't get the benefit of all that power, that was what worked on the Rx4 with the low rear gear.