need some opinions on vortech setup
08-22-2008, 10:03 AM
#1
need some opinions on vortech setup
Ok I have a vortech for a non-rev up on my non rev up motor and I have a 3.33, 3.12 and a 2.87 pulley and also a 32 tooth jackshaft pulley and a 34 tooth. I have the stock inter cooler and a bigger inter cooler, and I have the fmu for 8:1 stock and can convert it to the rev-up kit size 10:1... I have one step colder spark plugs to go on as well. and the rest of the car has an injen true duel exhaust stillen test pipes and 5/16 md plenum spacer... and my main question is with what I have what is a good set-up to run? which combonation... of items
08-22-2008, 12:10 PM
#4
well how good would it be to leave the 3.33 pulley and change the jackshaft pulley instead? and if I did upgrade my fuel system to 550 injectors and a walbro 255 and maybe a fuel return system... would I want to run the 2.87 pulley the 34 tooth pulley and the bigger inter cooler? would that still be safe on the stock block? cause I don't know have any idea what psi or power that would be making?
08-23-2008, 11:37 AM
#6
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Originally Posted by stealthz
well how good would it be to leave the 3.33 pulley and change the jackshaft pulley instead? and if I did upgrade my fuel system to 550 injectors and a walbro 255 and maybe a fuel return system... would I want to run the 2.87 pulley the 34 tooth pulley and the bigger inter cooler? would that still be safe on the stock block? cause I don't know have any idea what psi or power that would be making?
08-23-2008, 12:56 PM
#7
There is something that seems no one ever thinks about when figuring blower rpm speeds . When you use thier calculator on the web site . No one take into concideration that belt slip plays a big part of it .
I believe with a serp pulley system you will NEVER over spin a blower . The calculator doesnt figure in belt slip . You can put into the calculator a set of different size pulleys to max out the blower . With that set up - if there was NO belt slip you would be making close to what the blower is rated for in psi . [20 psi ] And no one ever does end up making that much boost . If you ran a all cog pulley set up like I did you would understand it better I think . Now with a smaller pulley set up , you will get to that slip point faster . But once it does the blower belt starts to slip a little and the rate of PSI GAIN starts to drop off . And the blower isnt turning as fast as you think .
I believe with a serp pulley system you will NEVER over spin a blower . The calculator doesnt figure in belt slip . You can put into the calculator a set of different size pulleys to max out the blower . With that set up - if there was NO belt slip you would be making close to what the blower is rated for in psi . [20 psi ] And no one ever does end up making that much boost . If you ran a all cog pulley set up like I did you would understand it better I think . Now with a smaller pulley set up , you will get to that slip point faster . But once it does the blower belt starts to slip a little and the rate of PSI GAIN starts to drop off . And the blower isnt turning as fast as you think .
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08-23-2008, 02:18 PM
#8
I agree that you'll be overspinning the blower but belt slip will be a big issue and probably prevent you from getting all your power unless you address it
I personally wouldn't even attempt both the 2.87 and 34 tooth pulley without extensive breathing mods - cams, headers, cats, full exhaust etc, but that's just me. So far, most people with vortechs that have gone to 13+ psi on the stock block without race gas or water/meth injection have had some bad days with their engine
I personally wouldn't even attempt both the 2.87 and 34 tooth pulley without extensive breathing mods - cams, headers, cats, full exhaust etc, but that's just me. So far, most people with vortechs that have gone to 13+ psi on the stock block without race gas or water/meth injection have had some bad days with their engine
08-23-2008, 02:46 PM
#9
Originally Posted by sentry65
I agree that you'll be overspinning the blower but belt slip will be a big issue and probably prevent you from getting all your power unless you address it
I personally wouldn't even attempt both the 2.87 and 34 tooth pulley without extensive breathing mods - cams, headers, cats, full exhaust etc, but that's just me. So far, most people with vortechs that have gone to 13+ psi on the stock block without race gas or water/meth injection have had some bad days with their engine
I personally wouldn't even attempt both the 2.87 and 34 tooth pulley without extensive breathing mods - cams, headers, cats, full exhaust etc, but that's just me. So far, most people with vortechs that have gone to 13+ psi on the stock block without race gas or water/meth injection have had some bad days with their engine
Engine mods will make a slight difference on when a belt starts to slip . But it still doesnt get the blower spinning to its max with a serp pulley system . Its the serp pulley its self that is the draw back . You cant get the blower spinning any faster than the serp belt system allows . We have seen serp pulley mods that have helped , but doesnt stop it from slipping . Once a belt starts to slip the rate of gain slows and finally slips enough to where boost starts jumping up and down but never really keeps gaining . And when the belt is slipping the blower isnt gaining rpm . This why you will NEVER over spin a blower with a serp pulley system . The blower gets to hard to turn for the serp pulley to hold
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