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Old 06-17-2014, 11:01 PM   #1
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IPF Pulley Upgrade

Currently I have my supercharger off the car and the Pulley removed. After doing some math it looks like the pulley size is 3.8". Doing some math on the Vortech website with their V3 information and the a crank pulley size of 6" I came up with this (Boost Estimate is with a Ported Intake and 1-7/8" Tuned Length Headers (American Racing Headers):

Max RPM = 7300
Pulley size 3.8" = Impeller Speed: 41495. Estimated Boost: 9-10 (Confirmed)
Pulley size 3.6" = Impeller Speed: 43800. Estimated Boost: 10-11
Pulley size 3.48" = Impeller Speed: 45310. Estimated Boost: 11-12 (Tested 11-12 PSI)
Pulley size 3.40" = Impeller Speed: 46376. Estimated Boost: 12-13
Pulley size 3.33" = Impeller Speed: 47351. Estimated Boost: 13-14
Pulley size 3.25" = Impeller Speed: 48516. Estimated Boost: 14-15
Pulley size 3.125" = Impeller Speed: 50457. Estimated Boost: 15-16
Pulley size 3.00" = Impeller Speed: 52560. Estimated Boost: 16-17 (Non-Standard Vortech Pulley, Max Recommended)
Pulley size 2.87" = Impeller Speed: 54940. (Over speed)


The max impeller speed for the Vortech V3 SCi is 53000, so we are safe until 2.87" pulley.

How much of a boost gain should I expect from a 3.48" pulley? That will be 0.32" smaller. Car runs 18.5 degrees of timing with no knock retard on 90 degree days, so it should be able to handle just a hair more boost.
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Old 06-18-2014, 01:48 PM   #2
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Said screw it and bought the 3.48" pulley. Once I replace all the bolts, belts, and paint on my supercharger I don't want to take it apart again. Will post on what the results are. I get it tomorrow but will be waiting for the new bolts though.
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Old 06-18-2014, 02:42 PM   #3
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make sure your belt will fit, I had to go to the 061073 size, there is no shorter size close to that without getting real short. So if I pullied down, I may not get a belt that would fit. It would be too loose and cause slippage.
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Old 06-18-2014, 03:07 PM   #4
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make sure your belt will fit, I had to go to the 061073 size, there is no shorter size close to that without getting real short. So if I pullied down, I may not get a belt that would fit. It would be too loose and cause slippage.
LLT is slightly smaller already, we use K061066 which is 107 1/8" long. Next size is K061058 which is 106 1/2". I think the stock belt should be good though, the tensioner had more room to work with. Will find out though, thankfully the wife's Mustang has 3.73 gears so it isn't as bad not driving my Camaro.

My big concern will be knocking, meth should take care of it though. I don't think Arno will tune for a smaller pulley.
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Old 06-18-2014, 03:50 PM   #5
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Sold the V6 Camaro.........

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Old 06-18-2014, 04:05 PM   #6
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Said screw it and bought the 3.48" pulley. Once I replace all the bolts, belts, and paint on my supercharger I don't want to take it apart again. Will post on what the results are. I get it tomorrow but will be waiting for the new bolts though.
Go for it!
Now we need an expert to tell us what a 9% increase in impeller speed translates to in boost.

BTW- just thinking if belt length does present a problem- it looks like the idler pulleys are just 1.8" in diameter (5.65" in circumference). Could you take up a little slack going to a 2" idler if needed?
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Old 06-18-2014, 07:30 PM   #7
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Go for it!
Now we need an expert to tell us what a 9% increase in impeller speed translates to in boost.

BTW- just thinking if belt length does present a problem- it looks like the idler pulleys are just 1.8" in diameter (5.65" in circumference). Could you take up a little slack going to a 2" idler if needed?
I've read that every 0.1" you lower you gain 1 psi. So I might be looking at 11-12 PSI since my exhaust flows well.

I thought about doing the idler pulley but with the bearing problems that cropped up I don't know if I trust any other idlers than the one IPF gives out. I know Vortech sells some, might look into it if the belt length is a problem.
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Old 06-19-2014, 12:58 PM   #8
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Got the pulley today and came across the first problem, the Vortech 3.48" pulley has an offset while the IPF one does not. The alignment is off by a quarter inch, so I will need to find a spacer to put on the small end of the new one to get it to align the belts correctly.
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Old 06-19-2014, 02:53 PM   #9
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Without a proper tune, won't you not be able to realize the full potential of more boost?

I'm no expert but I'd assume at high rpms you could experience a lean condition since you won't be getting more fuel. Are you planning to compensate with meth?
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Old 06-19-2014, 03:09 PM   #10
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Not that I would know, but Magnum is already running meth, right? In theory he's fine... in theory though. Depends on how much fuel he has left at his current boost.
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Old 06-19-2014, 03:24 PM   #11
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My current tune runs 11.5 - 12.0 AFR without meth, but some other tunes will run 10:1 since my car flows so well at low RPM that my LTFT's are positive. I can easily bring down the ratio one point with meth also. I've run the car at 13:1 and got my best trap speed from it. Majority of the detonation occurs near 5000 RPM's so that is the spot I will be watching at first.

Also, I'm running spark plugs that are 2 ranges colder, that will help with pre-ignition.

I will be taking it easy the first few times to make sure my AFR is good. Will also GoPro my gauges to review later. Hopefully by Saturday I can turn the car on and see how she likes the pulley.
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Old 06-19-2014, 10:44 PM   #12
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Best of luck!!
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Old 06-19-2014, 10:54 PM   #13
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First problem solved, took a dremel on a workstation and cut off a quarter inch of the offset side. All I have to do now is file just a small part of it to make it 100% flush with the old one.

IPF one on the left, new 3.48" on the right. Don't know why but it isn't this far apart in person.
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Old 06-19-2014, 11:41 PM   #14
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It's just the angle. Looks good!
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Old 06-20-2014, 11:05 AM   #15
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It's just the angle. Looks good!
Probably is good, it might be off by 1/64th of an inch, don't think that whille change the belt angle enough to cause problems.

Tonight I reinstall the bracket with new bolts and if no problems occur I will put the supercharger back on. The local auto parts store keeps K061058 belts on hand so if my belt is too long I can get a smaller one without waiting. Saturday should be tested day to see what changes happen.
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Old 06-20-2014, 01:10 PM   #16
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New pulley installed on the Vortech, fits like a glove, no wobbling. It is on newspaper because I was painting it since I had a lot of scratches on it. I am thinking of painting the IPF logo on the discharge tube above the intake pipe, might net me an extra 50 HP.
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Old 06-20-2014, 02:23 PM   #17
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Jokes aside, hopefully you're looking at a little under that much of a gain.
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Old 06-20-2014, 02:52 PM   #18
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Jokes aside, hopefully you're looking at a little under that much of a gain.
It will depend on how much boost I gain. Might gain 20 HP per psi. Should get a nice bump in torque though since I will have more boost down low. As long as I can control knock I should be good. 10% ethanol and meth injection is helping with that. When I was using 100% gas I was getting 10 degrees of knock, no way would I have done this.

Having to re-read the install instructions since the bracket install is critical. Been 11 months since I installed it originally.
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Old 06-20-2014, 02:56 PM   #19
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See, I've been waiting on FI to see how other things pan out (and I have a manual so I'm a little sketched out by TT, even though that's what I ultimately want) but if you start making gains then there may yet be motivation for me to get an IPF kit.
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Old 06-20-2014, 03:26 PM   #20
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See, I've been waiting on FI to see how other things pan out (and I have a manual so I'm a little sketched out by TT, even though that's what I ultimately want) but if you start making gains then there may yet be motivation for me to get an IPF kit.
I'm having to push the limits because of my wife's Mustang. Her car with just bolt-ons is trapping higher than stock SS Camaros here. I've made some good gains already, at the local track stock V6 will run 15's @ 93 mph. I'm at 13.3 @ 108. I need to get into the 115 range though, hoping with a smaller pulley and methanol cooling the supercharger it will get me there.

You are already a step ahead of my car since you have a LSD, I'm doing a one tire fire. I can't launch at any RPM higher than idle or I just spin.
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Old 06-20-2014, 03:39 PM   #21
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If stock cars run 15s and you're at 13.3 it sounds like you would be running high 12s very soon... Do you have bad air there, or is the track just unforgiving?

This really has me thinking.
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Old 06-20-2014, 03:57 PM   #22
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If stock cars run 15s and you're at 13.3 it sounds like you would be running high 12s very soon... Do you have bad air there, or is the track just unforgiving?

This really has me thinking.
We are over 1000 ft above sea level, usually have a head wind, only 91 octane and low humidity. Track prep isn't the best either, they allow 4x4 trucks with mud tires to go through the water box and destroy the track.

The top fuel alcohol guys trap 264 here.
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Old 06-20-2014, 05:00 PM   #23
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Ah, gotcha. That's really inconvenient - all of it.
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Old 06-20-2014, 05:44 PM   #24
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I'm having to push the limits because of my wife's Mustang. Her car with just bolt-ons is trapping higher than stock SS Camaros here. I've made some good gains already, at the local track stock V6 will run 15's @ 93 mph. I'm at 13.3 @ 108. I need to get into the 115 range though, hoping with a smaller pulley and methanol cooling the supercharger it will get me there.

You are already a step ahead of my car since you have a LSD, I'm doing a one tire fire. I can't launch at any RPM higher than idle or I just spin.
108 seems good, and I thinking with a great launch wouldn't that trap speed get you to a very low 13 or high 12??

115 sounds a bit much...heck ZL1s only trap 115 to 117. But if you can do it, more power to ya lol
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Old 06-20-2014, 05:44 PM   #25
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What the Mustang is faster? Ok, keep her happy.
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