DT: 1975 Porsche 911S RSR Race Car 3.0L Twin-Plug

Now available for auction is this 1975 Porsche 911 RSR-style race car finished in Lizard Green.  Based upon a 1975 911S Coupe, this example has been recently transformed by John James Racing into the RSR we see today with a full body kit, lightweight racing interior, adjustable coilover suspension, an upgraded 930 braking system, limited-slip differential, and a custom-built twin-plug 3.0L flat-six engine rated at approximately 350 HP.  Having received a fresh full service at a reported cost of $7k, this nicely executed RSR race car is being offered for auction by its seller out of Alabama.

Finished in bright Lizard Green with removable racing decals, this 911S has been fitted with a full RSR-style fiberglass body kit including custom front and rear bumpers, a center-fill hood, wide fenders with air vents, and a large Whale Tail rear spoiler.  The hood is secured with fastening pins and a tow hook is incorporated into the front bumper.  An emergency cutoff switch is located on the windshield cowl ahead of the passenger and lightweight Lexan windows have been fitted front and rear.  Very few miles are said to have been driven since the completion of the build and the car is described to be in excellent condition overall, detailed images are provided in the photo gallery along with images from the build process.  The 935-style staggered-width wheels come dressed in a set of new Goodyear Eagle racing tires with classic yellow sidewall lettering.

Inside, the cabin has been completely stripped, refinished, and transformed into a lightweight racing cockpit with a fully integrated roll cage, door bars, a Kirkey seat, and a fire suppression system.  Other features include a quick-release Momo steering wheel, Rennshift shifter, Rebel Raising raised tunnel, a 917-style wooden shift knob, and LED tachometer lights mounted atop the instrument cluster.

This 911 is equipped with a custom-built 3.0L flat-six based upon a 1976 type 930.02 engine.  Offering a claimed output of approximately 350 HP, this engine features PMO 46mm carburetors, ITG air filters, twin-plug XDI ignition, English headers, Turbo valve covers, Carrera chain tensioners, and a Stinger exhaust.  The rear wheels are driven by way of a 5-speed manual transmission paired with an RSR limited-slip differential.  The suspension includes adjustable billet rear trailing arm plates with bearings, spherical bearing strut mount plates, a 935-style front suspension manufactured by Racer Group, adjustable sway bars, Hyperco springs, and Penske coilover struts tuned and supplied by Kelly Moss.  The coilovers also include nitrogen remote reservoirs with 6-way adjustable damping as well as a Penske pressure gauge.  Other features include a 930 Turbo short ratio steering rack, 930 brakes with floating front rotors, Pagid race pads, and a 23mm ATE master cylinder.  A recent service is said to have been completed including a rebuild of the carburetors and suspension refresh.  Approximately 100 miles have been driven since the completion of the build.

This sale will include a clean title. A truly uncompromising build, this RSR-style 911S is sure to satisfy any seasoned racer or track day enthusiast.

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Comments (19)

  • $90,000 offer from unknown location 3 weeks, 4 daysago

    Offer in the amount of $90,000

  • ZyTyPro 3 weeks, 6 daysago

    Bid in the amount of $80,000

  • ehd911 (seller) 3 weeks, 6 daysago

    @theRennMeister Yes; it's streetable and is currently register in Alabama with an plate. You would likely need to alter the pistons to lower the compression to negate the race fuel requirement.

  • theRennMeister (registered bidder) 3 weeks, 6 daysago

    Can this beautiful angry beast be possibly tamed to be made street usable or street legal, is the VIN number from an original streetable Porsche 911. What do you estimate to make necessary changes to allow this car to be street driven under optimal conditions?
    I currently own a 996 GT3 Cup car built by Cantrell Motorsports with Montana registration and license plates which I regularly drive in the street and totally enjoy carving canyons in and around LA

  • peteport 4 weeksago

    Bid in the amount of $65,000

  • ehd911 (seller) 4 weeksago

    @JOSEJUAN As mentioned earlier in the thread, we cannot locate the Dyno that Dave Brown at Ware Racing used to tune the RSR after it's rebuild by Exclusive Motorwerks in NC -- I'm trying to track it down and will post here if we can locate it.

  • JOSEJUAN (registered bidder) 4 weeksago

    Do you have the dyno test?

  • ehd911 (seller) 4 weeks, 1 dayago

    @analogmike All was addressed during the John James Racing restoration & build as shown in the photos & videos in the gallery -- will request additional media per your request and post ASAP.

  • analogmike 4 weeks, 1 dayago

    @ehd911 the John James link shows the terrible condition of the jack points, rockers, and torsion bar tube, with amateur repair work before the restoration.

  • Silver930 (registered bidder) 4 weeks, 1 dayago

    Very nice build what a great looking 911. Would be fun to run this around Watkins Glen for a weekend or two. Best of luck with the sale.

  • ehd911 (seller) 4 weeks, 1 dayago

    @analogmike Please confirm the image galley photo#'s that you are referring to.

  • analogmike 4 weeks, 1 dayago

    The "before" pictures of the jack points, rocker panels, and torsion bar tube areas are scary... I did not find pictures of these areas after the restoration, can you post them?

    Sure would like to see the dyno sheets, those are very strong numbers.

  • ehd911 (seller) 1 monthago

    @geoque The RSR was built for 110 octane race fuel. I don't have the compression; will request such from our consignor.

  • geoque (registered bidder) 1 monthago

    @ehd911 what compression is this running? Does it run on regular pump gas.

  • ehd911 (seller) 1 monthago

    @Upshift4 Apologize for the delay. John James Racing performed the current build. Exclusive Motorwerks in NC did the initial engine rebuild; later it was modified by Dave Brown at Ware Racing. We do not have the Dyno sheets but it was on the Dyno for Dave to tune the car during his rebuild. Single Mercedes brake cylinder. Dave Brown and then later Franz Blaum rebuilt the transmission. It was raced in the 70's/80's; no logbooks as it was just run by an amateur privateer. The current build was for HSR Group 5/9. It's only been on the track for 2.5 HPDE days since rebuild, as shown by it's "like new" condition.

  • scriscra (registered bidder) 1 monthago

    Looks like John James. See: http://johnjamesracing.com/project/1974-porsche-911-rsr-13/

  • Upshift4 (registered bidder) 1 monthago

    So who built the car and engine? Dyno sheets? Single master brake cylinder?
    Any transmission details? Any log books? What class does it race in?

  • sportscarguy3 (registered bidder) 1 monthago

    Totally dig this strip down, race built, incredible sounding 911 S
    How fun would it be to take a few laps in this at Laguna or Sears Point!!!
    Only wish I had deeper pockets and a place to put it
    Good luck to all

  • uscarrera 1 monthago

    Bid in the amount of $50,000

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DT: 1975 Porsche 911S RSR Race Car 3.0L Twin-Plug
Buy Now: $145,000 Current Offer: $90,000