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FX35 Infiniti FX35 Crank/Pulley Options

Discussion in 'FX (03-08) - Engine & Drivetrain' started by rookie, Jul 15, 2007.

  1. rookie

    rookie Premium Member Premium

    Since we share the same exact motor (minus the upper oil pan on our AWDs) as the 350Z and G35s we do have some options for the crank pulley and aux pullies.

    Lightweight crank pulley can relieve some of the drag on the main crank which is what turns the rods and pistons of the motor.

    Underdriving your auxiliary pullies can relieve some of the drag on the main crank which is what turns the rods and piston of the motor.

    Harmonic crank pullies theoretically balance and absorb the vibrations of the engine, this is an old world mod.

    KJR Performance only comes in the standard lightweight crank pulley. I think the CNR might have come stock diameter and lightened but that became a huge fiasco.
    Link to manufacturer site. http://www.kjrperformance.com/products.htm
    Install pdf. http://www.kjrperformance.com/docs/KJR 350Z Crank Pulley Install.pdf

    Unorthodox Racing has been around for a while and has a few options for the VQ35. They do show a standard sized main crank pulley if you search under FX35 vs 350z.
    Link to manufacturer site http://www.unorthodoxracing.com/

    The UR pullies would be the best bet for underdriving or standard sizing the pullies. They have been around and are built with the correct steel sleeve to not damage the main seal.

    Link to Grubbs Performance for the pullies. http://www.grubbsperformance.com/c/G35CoupePulleys/G35CoupePulleys.html
    Link to Stillen for the pullies. http://www.stillen.com/browse.asp?c=PE&s=PULLEY
    Link to Everythinginfiniti for the pullies http://www.trademotion.com/partloca...rtInfo&PartID=437135&siteid=55&catalogid=3323
    Link to mynismo for the pullies http://mynismo.com/products/?id=4366

    There are 2 harmonic style crank pullies that I know of for the VQ35.
    Fluidampr http://www.fluidampr.com/NISSAN.htm
    ATI Performance http://www.atiperformanceproducts.com/products/dampers/charts/damnissan.htm

    I have not seen the ATI in person or compared it to a stock crank pulley. I learned this from the Vortech supercharged guys and did compare the Fluidampr to a stock pulley. The accessory portion of the Fluidampr is actually larger than stock which in turn will overdrive the auxiliary pullies. This is not a big deal except if you're using the accessory side of the crank to drive a supercharger. You will build more boost since the supercharger will be turned at a higher rpm with each revolution.

    I know of 1 Stillen that blew the motor soon after putting on the Fluidampr so beware if you're pulley boosted and using a pulley that is not stock or smaller.

    Summit Racing link for Fluidampr http://store.summitracing.com/partd...=FLU-640902&N=700+4294907666+115&autoview=sku
    Summit Racing link for ATI http://store.summitracing.com/partd...&N=700+4294839044+4294907666+115&autoview=sku

    Wheh I had the Stillen supercharger the KJR felt great. It felt like the supercharger built boost faster and rev a little more freely. When we took the pulley off there were signs that is was wearing on the oil seal so we did not put it back on during the motor rebuild.

    We opted to try the Fluidampr. Everything has been running good, no oil leaks or anything weird to report.

    Attached Files:

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  2. HumbertoCALI

    HumbertoCALI Premium Member Premium

    South Gate, CA
    2003 FX45 AWD
    Thanks for the info.

    Is this option available for the 45's. I have looked into it a bit and I have not found anything for the 45. Do you know of anyone who will have this mod for the 45?
  3. Marty

    Marty Member

    thanks, my NEW UR pulley set was waiting for me at home today :LOL:
  4. OP

    rookie Premium Member Premium

    I don't believe I have ever seen anything on the market for the VK45, this is one of those instances (probably many) where the FX35s just luck out with the aftermarket due to our cousins.

    Sweet, what color and what price did you pay?
  5. Psiclne

    Psiclne Guest

    I never noticed this thread.....good info Rookie.;)
  6. Dr.2K

    Dr.2K iS Doctor on Duty iS VIP

    Santa Clarita, CA
    2005 FX45
    45's left out again!
  7. jbaker1121

    jbaker1121 Im in touch with humanity iS VIP

    Westchester, New York
    09 FX50
    what exactly do these do? increase power?
  8. Keemo

    Keemo Premium Member Premium

    Is it worth looking into getting the full 'Stock size' pulley set?

    Or would the Crank pulley be enough for gains?

    I believe it reduces the load on the crank shaft by reducing the weight of the pulley. In other words, the engine doen't have to work so hard to turn the crank shaft.Thus more power to the wheels??? Some can tune in for more info...:shame:
  9. OP

    rookie Premium Member Premium

    Yes, lowers the drag on the motor by taking some weight off of the pulley. All in theory, most people report it feels like it revs up more freely. Not sure on measurable hp and tq gains.
  10. Psiclne

    Psiclne Guest

    When I put the WRP Pulley on my car 3 weeks ago, I noticed the RPM's climbed up with much more ease. I wouldn't say it produced anymore power though.


    My understanding is the undriven ones produce some power, but the con is that you underdrive your accessories. :confused:
  11. brown_fv

    brown_fv Premium Member Premium

    I have the UR stock sized pulley, and i personally felt a nice bump, especially down low. the pulley is only around 6 lbs lighter or so, but when it gets rotating and the engine is moving i believe its weight savings mass is substantially more.

    i would recommend this mod.
  12. Mongolian

    Mongolian Premium Member Premium

    Are the UR pullies reliable for long-term use? I've always considered this, but afraid of the long term reliability.

    Will, How much did LMS charge you to install yours :LOL:
  13. Psiclne

    Psiclne Guest

    I believe it was like an hours worth or work......I believe $80 around there.