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johnc

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Posts posted by johnc

    S13 Rear Subframe upgrade for 260z

    in Brakes, Wheels, Suspension and Chassis

    Posted

    Without knowing condition of the stock 280z rear suspension and the condition of the 240sx rear suspension that you installed, the comparison is not valid. Yes, a multi link is inherently better at locating the rear wheels and maintaining proper alignment over the range of suspension travel. But the rear suspension of the S30 is pretty good and can be made a lot better for under $1,000.

    Strut options for ground control coilovers?

    in Brakes, Wheels, Suspension and Chassis

    Posted

    No flame.  Tokico has been out of product for almost a year and I just saw a job opening for an Aftermarket Product Manager on LinkedIn so people are leaving the company.  The Bilstiens are the best option for you.  It will just take some work to put together the package.  I offered it (P30-0032 shocks, gland nuts, and gland nut tightening wrench) for $800 for a year or two and only sold one set.  Most folks said it was too expensive.

    • Like 1

    Strut options for ground control coilovers?

    in Brakes, Wheels, Suspension and Chassis

    Posted

    No, the Bilstien P30 is an inverted shock and the gland nut actually seals on the sliding, hard chromed shock body.  The Bilstien gland nut uses a double wiper seal.  Shox.com has sourced the gland nuts for meand should have the corrct part numbers.  There are also options for using the parts included in the box with the shocks.  There are a couple writeups here where the person welds the female ring on the top of the strut tube and then uses the included male gland nut.

    STI diff question

    in Drivetrain

    Posted

    Without knowing the lockup percent of the STI diff, the lockup torque of the STI diff, the horsepower and torque curve of either engine, and the traction provided by the tires, how can you determine the lockup rate and total percent for the 4 cylinder turbo STI engine and your 6 cylinder NA L6?

     

    Having cut the ramps on a couple BMW diffs and tuned a few OS Giken diffs for customers you need a lot more information before figuring you know more then the engineers that designed these units.  The ramp cuts I did to the BMW diffs were at the request of the customer and resulted in no change in course times and a slightly more difficult car to drive.

    R200 CLSD

    in Drivetrain

    Posted

    The OBX is a good unit for the price.  It has the same drawbacks as other ATBs but if you adjust the suspension to work with it the unit it is good in a race environment.  IMHO,  the OSG Super Lock is a great diff for racing and much better then the ATBs on the S30 chassis.  For street use the ATBs are a great choice.

     

    And Whitehead in Canada is good people.  I would not worry about anything they have to sell.

    Roll bar questions-yes I've searched plenty over the past two years

    in Fabrication / Welding

    Posted

    4130 is medium carbon steel. It's very weldable and doesn't have a cracking issue unless the fabricator goofs up. The number one cause of cracking in 4130 tube fabrication is poor fitments. The gaps must be no thicker then the filler material. That means no gaps greater then .063" EVERYWHERE around the tube junction.

     

    A larger gap requires more heat and filler to fill which tends to work harden the joint. 4130 is less ductile then 1018 (DOM) and can crack if a lot of heat and filler is used. 4130 can be MIG welded if the fitments is correct and the welder makes two or three even and smooth passes around the joint. At thicknesses less then .125" post weld stress relief is not required if everything is done properly.

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