Some boost calculation help needed
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Joined: Aug 2005
Posts: 3,462
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From: Amsterdam Ny, the good part
Some boost calculation help needed Just upgraded to a sdce setup on my 99 formula. I was running a 6" crank and a 3" pulley
Sd concepts told me that to run 6ish lbs of boost I need to get a 4.25" pulley. My car has just a ls6 intake an Mac mid headers.
Now doing the math. I'm now spinning the procharger slower.
6 rib setup is 49200 at 6000
8 rib setup is 41964 at 6000.
Now was I getting so much belt slip that this new setup will net me 6 lbs? Or did sd screw up? Bc now I need a new pulley and a new belt.
I don't have a boost gauge installed. Dumb I know. I've had it sitting on a shelf for two years. Just didn't want an. A pilar pod so I didn't know where to put it.
Anyone have any ideas
And also can I change a pulley with the procharger still on the car.
And if I change pulleys I'm going to a 3.4 will my belt be good?
Sd concepts told me that to run 6ish lbs of boost I need to get a 4.25" pulley. My car has just a ls6 intake an Mac mid headers.
Now doing the math. I'm now spinning the procharger slower.
6 rib setup is 49200 at 6000
8 rib setup is 41964 at 6000.
Now was I getting so much belt slip that this new setup will net me 6 lbs? Or did sd screw up? Bc now I need a new pulley and a new belt.
I don't have a boost gauge installed. Dumb I know. I've had it sitting on a shelf for two years. Just didn't want an. A pilar pod so I didn't know where to put it.
Anyone have any ideas
And also can I change a pulley with the procharger still on the car.
And if I change pulleys I'm going to a 3.4 will my belt be good?
So what crank pulley are you running? If it's the ATI 8-rib hub, it's 7.65", so take that into account for your calculations.
Also, which blower? Is it a P1 or D1?
I'm not sure about the SDCE bracket, but I know with my Aster bracket, I need to unbolt the blower and part of the bracket to remove the belt. If you go from a 4.xx to a 3.4" pulley, chances are you need a smaller belt.
Also, which blower? Is it a P1 or D1?
I'm not sure about the SDCE bracket, but I know with my Aster bracket, I need to unbolt the blower and part of the bracket to remove the belt. If you go from a 4.xx to a 3.4" pulley, chances are you need a smaller belt.
Or if you have a scan tool, just measure the map sensor and do the calculation yourself.
210kpa = ~14.7psi of boost. So 150 kpa would be (150/210)*14.7 = ~10.5 psi of boost.
210kpa = ~14.7psi of boost. So 150 kpa would be (150/210)*14.7 = ~10.5 psi of boost.
