Swapping from 4" pulley to 3.75" for Kenne Bell (pre swap dyno #'s)
I am currently running the 4" and was wondering who was running the 3.5" on stock internals.
I just ordered one and am awaiting shipment.
Not sure what the boost difference is going with this pulley, I am thinking about 4psi?
I am a little scared going to 12psi, but I don't run on a track, I don't ever hit the rev limiter & don't have slicks on the car. I am assuming if I am careful, the chances of anything breaking is minimized.
When people break rods, are they destroying the bottom end? Anyone know the cost of upgrading the internals before vs after a rod breaking?
Still running stock clutch till she lets go... assuming that will be the next grand I blow.
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2006 Mustang GT / 18" Polished Bullitts
Full Cervini body kit
Intercooled 10psi Kenne Bell
3.73 Gears w/Pro 5.0 Shifter
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Be afraid very afraid
I ran a 3.5" pully ........................for a week.
Or should I say a weak rod that is.
Good news
Dynoed 509/502tq had it up to 515 but it was detuned hahahahahahahah!!!!
Bad news
Bent rod.
I would go with a 3.75" pulley until your ready to buy a short block.
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mods to come: fuzzzy dice, strawberry air freshner, floor mats, compass, clover leaf key chain
1000-2000 just to pull the motor and get it disassembled and between 2000-4000 more in labor depending on what else you get done, assembly of the short block and head work, fuel pumps etc etc...
If you break a rod, you most likely need a new block. If you do it prior to theexplosion you can save between $800-1700 depending on what block you get. An iron block is $430 plus maching is another $350 or so. Aluminum is $1100-1300 plus machine work.
Either way, start saving and shopping for an assembledshort block.
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Motor Built and tuned by ST Motorsports
Don't forget everything else after the short block.
GT 500 fuel pumps $649
60 # Injectors $250
8 bolt flywheel $250-$500
Head gaskets $125
Head Studs $200
Oil Pump$100
What ever you decide to do with your stock heads $300-$3000
Throttle body$499
8 rib Kit $399
Clutch $399
Then don't forget about your input shaft
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mods to come: fuzzzy dice, strawberry air freshner, floor mats, compass, clover leaf key chain
You can do it but you should not be running that 8 PSI tune at 12 psi.
I would bet that if you called Jim Bell he would say you need to dyno tune by 11 PSI.
You will be dangerously lean if you run that 8 PSI tune at 13 PSI, which is what youmay get from a 3.5" pulley.
I have been running 11-12 PSI on my KB for almost two years on stock block. I have a safe A/F ratio and run 100 octane and its all good.
Swapping from 4" pulley to 3.75" for Kenne Bell (pre swap dyno #'s)
