Belt Tension, Belt Calculators, and Belt Wear

  1. BELT TENSION: Wrong. New style EPDM serpentine belts are elastic, and stretch under load. A proper automatic spring loaded belt tensioner will properly correct the belt tension while in use. Manual tensioners or heavy duty belt tensioners can add too much belt tension, causing higher temperatures and wear at bearings, idlers, supercharger, and crankshaft. Always use a belt tension tool such as a Gates Krikit. You can use the attached chart to determine your proper belt tension. Each brand of tool may have different requirements, so use the chart with the tool being used. If you can’t get the belt to be in the proper tension, purchase the correct size belt or use an eccentric idler to dial in your tension.
  2. BELT SLIP: The cause of belt slip can be for various reasons. The proper diagnostic is important. Some belt slip is normal. Remember, it is about surface areas. Belt slip can be caused by the following:
    • Worn serpentine belt- even new belts can wear quickly if not adjusted correctly. Use a belt wear indicator to determine if your belt is good.
    • Worn pulley(s).
    • Pulleys cut with the improper V Groove.
    • Improper belt length.
    • Worn tensioner.
    • Too small of a pulley.
    • Improper belt tension.
    • Too small of a pulley size. Generally, anything smaller than 2.5″ will have more slip.
    • Not enough ribs to support the load. General rule of thumb: 4 rib is good to about 6lbs of boost, 6 is to 11, 8 is to 17 and so on.
    • An issue with the supercharger, causing higher load.
    • Belt alignment.
    • Belt type- stay away from ‘saw cut’ style belts. You want the most surface area.

Here is a good article on belt wear:…/diagnosing-epdm-belt-wear-with…

99-04 Ford Lightning/Harley Davidson Supercharger, Midplate, and Intercooler gasket differences

We receive calls, complaints, and returns all the time that are in error when it comes to purchasing gaskets for this vehicle. Many of the early 99-00 Ford Lightning had intercooler recalls. This caused a change in a part number for the intercooler gasket. It also does not help that manifold swaps have taken place due to the higher flow of the 01-04 years. I bet I spend 20 hours a month trying to educate consumers. It is hard to believe after 20 years, that there is still some mis-conceptions floating around the internet on this subject. Before you order gaskets from us, please check the following.

Supercharger: You can tell the difference between a 99-00 and 01-04 Supercharger by measuring the right hand side of the supercharger (when looking at it from the front). A 99-00 will have a 2 1/8″ center to center between the first and second bolt. 01-04 Ford Lightning will have 3 1/4″ center to center for the same bolts. The picture below shows a 01-04 Supercharger with a 99-00 gasket sitting below it.

The next difference is the intercooler gasket. 99-00 Ford Lightning intercooler gaskets are 4 7/8″. 01-04 Ford Lightning intercooler gaskets are 5 3/8″. 99-00 gaskets are on the left and 01-04 gaskets are on the right.

NOTE: There is also 99-00 Ford Lightning RECALL intercoolers that use ONLY the intercooler gasket from 01-04. All other gaskets on a recall manifold will 99-00.

The midplate gaskets on 99-00 and 01-04 are not the same. They do not interchange. Years with the intercooler recall will use 99-00 midplate gaskets. If you have a 99-00 supercharger, you will use a 99-00 midplate gasket. If you have a 01-04 supercharger, you will use a 01-04 midplate gasket.

So to sum it up:

99-00 Supercharger- and need to replace the intercooler gasket? narrow intercooler- order 99-00 gasket set. Wide intercooler, you will need 99-00 gasket set AND 01-04 gasket set.

01-04 supercharger- order 01-04 gasket set.

General Supercharger Knowledge Base:

Belt Tension Calculator for Gates Krikit Belt Tensioners:

General Formula for calculating speed on most supercharger installations with the supercharger driven from the crankpulley. If you have a Jackshaft, you may have to calculate the pulley ratio, then multiply at the end: Calculator: (Crankpulley / Supercharger pulley) x maximum engine RPM x step-up ratio <or = Y

Maximum Blower Speeds:


V9 Step-up ratio: 3.45 Maximum RPM 52,000


M45/MP45/M62/MP62/M90/MP90/M112/MP112/M122/MP122: Short shaft rotors are limited to 14,250 rpm (closed ended bearings). Long shaft rotors are limited to 18,000 rpm (open ended bearings).

Eaton does not use teflon on the rotors. They use epoxy coating. JBP uses a ceramic. It doesn’t chip or flake like epoxy and is resilient to sprays such as methanol and fuel.

You cannot bore out a twin screw or roots supercharger by putting larger rotors in it. They are either longer, or much wider than the case. Yes, I know someone tried to adapt M122 to M112, but the discharge was still in the M112 position and the rotor mass increased while power output was disappointing compared to other M122 models. Wasted resources. You would be better off adapting a larger supercharger all together.

The company on the internet, bragging that they put M112 rotors in a 2300AX Lysholm and made more power may not have passed 2nd grade math. The M112 is a 1.8L and the 2300AX is a 2.3L. It doesn’t add up.

You cannot convert a CW centrifugal to a CCW centrifugal. To convert a supercharger, you would need gears, impeller and volute. The gears are angled different- AND if you have have straight cut gears, the threaded nut has threads in the opposite direction.

Caution: URD Supercharger pulley issue with TRD/Magnuson 3.4L Superchargers:

JB Performance Playbook on How to Properly Pack a Supercharger for Shipment.

There are alot of things to consider when shipping a package. Shipping carriers are under tremendous pressure to stay on time, control costs, and deliver, all without any issues. Many times, when issues arise, it is typically due to carelessness or mistakes in the packing process, then it is the carrier. The worst situation is when damage to a package occurs. Below are tidbits for packing heavy items. This article is written to reflect superchargers, a heavy car part, but could apply to any related industry. Our company deals with many auto shops as well as residential customers. Many times, packing materials are not readily available. We hope that this article will inform and educate.

  • Things you need to know first. Most carriers base pricing on SIZE, WEIGHT, and ZIP CODE. This is important as it will tell them how many packages will fit on the truck, semi, airplane, or boat. They can calculate the fuel cost and labor costs. But more importantly, they can calculate how many packages can fit on that truck or plane before space or weight becomes an issue. All space is used. From the floor to the ceiling. It is not uncommon to have box weights under 65 lb placed on 2nd, 3rd, or 4th row to consume all available space. If you wish to refrain from having any item stacked on top of your package, you should most likely choose Freight Shipping with a Pallet. If your package will weigh over 150 lbs, you should also choose Freight Shipping. This article will focus on Parcel Shipping which is primarily 99% of our business.

  • Choose a box size that is 2″ to 4″ larger than the supercharger on all dimensions .
  • Choose a weight of a box that will properly support your supercharger. In the USA, you can identify this by a round label in the bottom of the box called a Box Manufacturer’s Certificate. The BMC below on the singlewall box is rated for 65 lbs, but can be crushed if anything over 32 lbs per inch is placed above it. This means this box would be a poor choice for a bottom row item.
  • The 2nd picture below is a similar size of box, but doublewall. This box is rated for 100 lbs of goods inside the package, but more importantly, able to hold 275 lbs per inch. This box would make an excellent candidate for a heavy, bottom row item. It will be able to take the force of many rows of boxes, of various weights, stacked above it.
  • Choose the packing material carefully. Air pillows and peanuts will not work with heavy items. Air pillows will pop. Peanuts will shuffle around, allowing heavy items to settle to the bottom, exposing them to damage from below. Bubble wrap and twisted paper works well on items under 30 lbs. Avoid using bubble wrap on anything over this weight. Solid, dense foam, layers of cardboard sliced to line the sides of the box are a good choice. Pink building Styrofoam are really good choices for customers without proper packing materials. They come in 4×8 sheets and in various thicknesses, but can be cut down easy with a utility knife to fit in any package. We recommend the 1.5 to 2″ thickness as a good, overall choice. For those that wish, we offer up Room Temperature Instapak foam in our Shipping Supplies page for purchase.
  • Does the item contain any hazardous materials that can leak or cause a safety risk? If your supercharger has any oil that can leak out, it should be drained and properly recycled. Any coolant should be blown out of an intercooler. Any fuellines should have the fuel blown from the fuel lines- or removed. Failure to do these things can cause your package to become wet, which can damage and soften up the cardboard, leading to container failure. Gasoline can be highly explosive and dangerous not only for trucks, but air freight. Many times, packages like this can be red flagged and forced to travel by Freight, leading to a slow, and expensive process for the consumer. Take the time to remove the hazardous materials now, and save a bunch later.
  • Note any areas of the supercharger that could poke through packing materials and or could be easily damaged. As you are packing the item, these are the areas to focus on. Bypass valves, pulleys, bolt studs, and vacuum ports are common items to become damaged.
  • Line the box with many layers of cardboard or foam. Be sure there is at least 1.5″ to 2″ of solid foam. This is your base.
  • Lay the supercharger within the package by centering it up. Any loose hardware you wish to include, place in a ziplock or small box and place aside or tape to the supercharger. Start by lining the sides of the box. Choose the pulley side as the first side to protect. Sometimes, a layer of cardboard in this area will offer up extra protection. Continue lining up the sides till you have your minimum sidewall base. Now you have a foam protective box within your box. Identify open air space areas. This is the area to fill with dense packed items, bubblewrap, cardboard. You do not want the supercharger to shift around and break out of the package. Pay attention to the areas that were identified earlier as areas that damage could occur. Use extra dense materials in this area, perhaps some extra cardboard to assist.
  • After you have confirmed airspace voids are full, place your minimum coverage over the top side of the box. Now is the time to trim down you box size if necessary. Make sure to leave enough cardboard on your flaps to cover the package.
  • Be sure to use a tape that will stick and hold to your package. Tape all edges, not just the center of the box. Check the box for any old labels, bar codes or tags. Old tags or bar codes can cause delayed and or lost packages. Remove them or cover them up. If your supercharger weighs more than 65 lbs, place warning stickers on the package that the item is heavy.
  • Stand back. Does your supercharger look like a UPS driver can drop it from 2 feet? If so, you are ready to ship! Do not forget to include your REPAIR REQUEST FORM!
  • If you find that you require materials or wish to have a foam box delivered with the space within, we can offer this service. You do pay for the box and foam upfront, but it is refunded and applied when your supercharger arrives. We can even prepare UPS labels and UPS pickup for you so that you do not need to heave this item into your only other running vehicle and haul it across town. Just pay the shipping fees! Reach out to us in our contact section.

Last note. Insurance. Insurance will not cover damage to poorly package items that do not follow the guidelines above, no matter who you pay to pack the item. Think of insurance as protection against lost items, acts of God, or the crazy idiot that tried to pass the UPS truck on a snowy road. You can add all the insurance you want. If you package the supercharger like the one below, without any protective material, you just threw away the insurance money that you should have spent on packing materials. You wouldn’t send a diamond ring in a padded envelope, so why send your supercharger with just a single chunk of cardboard.

IHI Hellcat Supercharger with Aftermarket Smaller Pulley

Please note that we recommend that you keep a one-way pulley installed on all Hellcat and Demon Superchargers. The one-way pulley serves as a dampner to avoid having timing issues within the heavy extruded rotors that are used in the IHI superchargers on these high performing vehicles. We recommend choosing an over-drive crank pulley over swapping out the supercharger pulley. With that said, some of you may choose to proceed with a smaller pulley installation. If so, please be aware of casting shift and possible necessary machine work that may be required. All smaller aftermarket pulleys should be inspected for clearance between the pulley and the drive snout casting housing. If you cannot insert .003 behind the pulley, machine/clearance work should be done to avoid pulley damage and possible contact.