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Sould i pulley down a size or no?

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Old Jan 7, 2015 | 11:41 AM
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Default Sould i pulley down a size or no?
My car is at PCM of NC being tuned after they installed my d1sc with race front mount and aster bracket... made 622rwhp with a 4.38 pulley at 10 lbs boost and alvin is saying it looks like it wants more boost and it still should be safe... Should i pulley down to a 4.25 or a 4.13 for a few more pounds or stay where im at?? Back ground of car is 1998 6 speed trans am with moser 9 inch 4.11 gear tick built trans 01 ls1 block rebuilt with stock crank stock rods with arp 2000 rod bolts mahle power pak forged pistons rings -4cc valve reliefs ls9 head gaskets arp head bolts all mahle clevite bearing throughout Advanced inductions blower cam with 317 AI heads milled to 65cc chambers with 226/232 runners so roughly 9.8:1 compression ... just want a safe reliable car only bring it out on nice days and goes to the track maybe 3-4 times a year
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Old Jan 8, 2015 | 07:09 AM
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With your car having the factory rods, although you have arp 2000 rod bolts, I would keep it as is. Bob
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Old Jan 8, 2015 | 11:47 AM
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Just like Bob said, with factory rods, I'd be careful.

Can it make more power, and be safe, for a while, sure. How long, noone can say. If you want more power, I'd start the process of buying a new shortblock because if you lose a rod, there's chances it can take the block with it.
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Old Jan 8, 2015 | 02:37 PM
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yeah i understand but in the same token arent they just as at risk at the 622rwhp/10 psi im at now?
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Old Jan 8, 2015 | 02:45 PM
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Originally Posted by dwayneogles
yeah i understand but in the same token arent they just as at risk at the 622rwhp/10 psi im at now?
No, as the power goes up so does internal forces. Bob
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Old Jan 8, 2015 | 03:41 PM
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Originally Posted by dwayneogles
My car is at PCM of NC being tuned after they installed my d1sc with race front mount and aster bracket... made 622rwhp with a 4.38 pulley at 10 lbs boost and alvin is saying it looks like it wants more boost and it still should be safe... Should i pulley down to a 4.25 or a 4.13 for a few more pounds or stay where im at?? Back ground of car is 1998 6 speed trans am with moser 9 inch 4.11 gear tick built trans 01 ls1 block rebuilt with stock crank stock rods with arp 2000 rod bolts mahle power pak forged pistons rings -4cc valve reliefs ls9 head gaskets arp head bolts all mahle clevite bearing throughout Advanced inductions blower cam with 317 AI heads milled to 65cc chambers with 226/232 runners so roughly 9.8:1 compression ... just want a safe reliable car only bring it out on nice days and goes to the track maybe 3-4 times a year
Whats the timming and afr look like? Just pump gas, No meth? What rpm is the 10lbs at? Reason Im asking is that Im building a similar setup with an lq4,D1SC/w FMIC, Tick blower cam, LS9's, and stock cc 243's instead. Alvin is gonna be tuning mine also.
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Old Jan 8, 2015 | 06:03 PM
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Just 93 pump gas no meth.. Not sure on the rest of your questions I trust Alvin with his tuning and decisions so we are pulleying down to a 4.13.. Should have final number tomorrow but he said he kept giving it timing and it was responding really well which usually means it wants more boost.. So we're gonna give her 2-3 lbs more and back off the timing
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Old Jan 8, 2015 | 06:05 PM
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Car has a lonnies double pumper setup with fic 1000s and fast rails so I'm sure I have plenty of fuel to be plenty safe
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Old Jan 9, 2015 | 07:59 AM
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Of course it wants more boost, they always do!!! In for results.
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Old Jan 9, 2015 | 08:27 AM
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Originally Posted by JRENIGAR
Of course it wants more boost, they always do!!! In for results.
No doubt, they usually like all the boost you can give them. You just have to be careful. Bob
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Old Jan 9, 2015 | 10:00 AM
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I'll probably see what it does with the 4.13 pulley then chicken out and go back to the 4.38 pulley haha
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Old Jan 9, 2015 | 11:12 AM
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I wouldnt even try the other pulley to be honest. The cars gonna haul *** like it is. My luck, Id bend a rod or blow the engine on the dyno and there Id be. !!!
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Old Jan 9, 2015 | 12:33 PM
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Ok so I chickened out lol put the 4.38 pulley back on and gonna finish up the tune hopefully final numbers and delivery today or Monday!! Currently at 622 rwhp hoping for a few more
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Old Jan 9, 2015 | 12:45 PM
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Originally Posted by dwayneogles
Ok so I chickened out lol put the 4.38 pulley back on and gonna finish up the tune hopefully final numbers and delivery today or Monday!! Currently at 622 rwhp hoping for a few more
Bob
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Old Jan 9, 2015 | 03:18 PM
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Do you know the cam specs?
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Old Jan 9, 2015 | 08:44 PM
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230/238 .605/.605 113 lsa + 3 advance
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Old Jan 9, 2015 | 09:34 PM
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What's the blower RPM at your shift points with the current pulley?
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Old Jan 10, 2015 | 06:11 AM
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Originally Posted by dwayneogles
230/238 .605/.605 113 lsa + 3 advance
Wow +9 degrees is alot of overlap for a blower cam isnt it?
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Old Jan 10, 2015 | 08:44 AM
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?? Where are you getting the +9 from??
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Old Jan 10, 2015 | 08:58 AM
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I'd run it at 14lbs at peak. Brings up midrange,then just pull timing up top. Even 16 wouldn't scare me.
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