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240RS winter updates (VVL and Quickchange)

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  • 240RS winter updates (VVL and Quickchange)

    I always use this forum for information and have met some great people but figured I should add to it as well. So, time permitting (we will most likely be moving soon so that will take up a very large chunk of the winter) I am upgrading the head in my engine to a 20VE, ditching my ITBs (I don't want to spend $2000+ on a decent large set) and making a new intake manifold with 80mm throttle (possibly a GTX35 as well). The rear end is also getting some love in the form of a Speedway Engineering IRS Quickchange with a ICP/Citation plated diff. Though I would LOVE to make a new rear subframe with double A-arms, I don't have the time (that will be next winter). I will therefore put the existing S14 on a jig, cut the center out and make a bolt-on tubular structure to hold the diff. I also upgraded my Autronic SM2 (which is awesome) to a Vipec V44 (which will just enable me to make my car more complicated!)

    I still have a lot of parts to buy so that will be the limiting factor in getting everything done before April or May. I've sold off all of my old parts so there's no turning back now

    I'm in the process of switching over to a VE head. I bought a long block for 800 shipped, kept the head, solenoids, oil pan/pickup and a few other things. I sourced one of the 20V cam sensors new when I had an extra $300 in the bank so thats one reasonable cost eliminated already. I cleaned up the ports a good amount and will be using the stock 20VE cams with supertech valves and springs (and my old tomei cam gears to get the overlap to an acceptable level for compressed air)
    I've been working on a dual plenum manifold (with a tapered primary) in solidworks. The final part for the manifold should be done machining this week so it should be welded together by the end of next week. The secondary plenum can be enlarged (with a 1" spacer between the 2 flanges) and I will test two sizes on the dyno.

    Stock when it arrived.


    Sitting on my DE block. I already welded the hole in on the face of the head, drilled and tapped the side hole.



    Intake Ported


    Plenum with watercut flange


    Secondary Plenum (without primary tapered plenum) in SW




    QuickChange with 4.86 CWP.

  • #2
    Are the output flanges on the diff custom made to bolt to nissan axles? Also, what is weight like compared to r200? Looking forward to see it all come togethor, thanks for sharing!

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    • #3
      Originally posted by spent View Post
      Are the output flanges on the diff custom made to bolt to nissan axles? Also, what is weight like compared to r200? Looking forward to see it all come togethor, thanks for sharing!
      The flanges are for Porsche 930 CVs so I'll have to have mine modified to fit. I haven't weighed it complete but it is probably on par. The diff unit itself is very light, billet aluminum.

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      • #4
        Anymore info/links to the internals of that QC? I've been considering this myself.

        What are the goals with the p11 head swap? More mid range and higher hp?
        Last edited by PerilousActs; 12-23-2011, 10:42 AM.
        My Blog | Unfriendly Garage | Endurance Motorsports

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        • #5
          I'm thinking of doing something similar with my engine while it's already down. You finding any market for the SR20VE bottom end, or is it basically scrap metal?

          BTW - you looked into the 20V cams? They seem pretty beast with a little overlap taken out.
          '18 Chevrolet Volt - Electric fun hatch for DD duty!


          DefSport Koni Sleeve and Spring Perch Buy!!!
          http://www.nissanroadracing.com/showthread.php?t=5902

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          • #6
            Originally posted by PerilousActs View Post
            Anymore info/links to the internals of that QC? I've been considering this myself.

            What are the goals with the p11 head swap? More mid range and higher hp?
            I'm just looking for more midrange and higher HP, 550 (on our dyno) for timed sessions and 450 for practice and hillclimb.
            Full Size (10" 12 Bolt)QC internals are all the same, between every brand. There should be some photos on Speedway Engineering or Winters site with internals. Mine is empty now, all the parts are sitting in a box beside it. I just need to get a new bearing set before it goes together.

            Def,
            Not really any market on the bottom end. My friend rallies a Sentra with a VE so he will most likely buy the short block as a spare. Everything that came with the engine looks like it has 10,000 miles on it. The power steering and alternator both look like they just left the show room. I posted on SR20-forum and got one reply on the stock valves (which I regret selling as I forgot to measure the factory valve height on one for reference)

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            • #7
              I thought that Dentsports tried the VVL head before? Def I would throw the short block up for sale on the fwd forums. People spin rod bearings there VE's and would love to just get another block and swap stuff over.... well I wish someone was selling one when I did a few years ago.

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              • #8
                Been putting a little time in lately. The rear sub-subframe for the quickchange is complete. I have been racking my brain to decide on the rear suspension. The toe rod will be relocated to a better position and the pickup on the upright side will be modified for height adjustment.







                Axles could be the expensive part. I don't need stronger axles but I need shorter ones. Anyone know if the factory axles can be splined further down the shaft?


                VE parts are almost all in. I need valves and a DBW throttle still but have springs/retainers, VE solenoid blocks, 20V CAS, all machined parts for the intake manifold. Mazworx O-Ringed Manifold to Head Flange



                Mazworx ARPs made out of 2000 material with interference lower portion, VE CPs and Supertech Springs/Retainers


                Solenoid Blocks


                This thing has been eating my time but well worth it. Drenth DG500 in there.

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                • #9
                  Truck guys shorten axles/shafts and spline them further down a lot. I don't think you should have any problems doing that. However, I'm not sure on the stock axles.

                  You guys running at 100aw this weekend?
                  My Blog | Unfriendly Garage | Endurance Motorsports

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                  • #10
                    ooooooooh porn!
                    "hexa-dodecahedron-triple-threaded-super-eleventy-way-adjustment-spec" dampers. -Def

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                    • #11
                      If only I could fit a quickchange..... would solve allll kinds of problems with this damn car!
                      Originally posted by SoSideways
                      I don't care what color they are as long as they are LONG AND HARD.
                      '04 G35 Sedan 6MT- The DD
                      '96 240SX- The Track Toy

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                      • #12
                        Blew my mind again.
                        Support innovation, buy from companies that design their own parts!

                        Friends don't let friends buy knock-offs.

                        Suspension before power.

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                        • #13
                          Originally posted by Matt93SE View Post
                          If only I could fit a quickchange..... would solve allll kinds of problems with this damn car!
                          They are really modular. You can get any live axle QC, then buy the end bells for IRS. Its literally a bolt on swap.

                          See page 6 here for details: http://www.wintersperformance.com/20...%20Catalog.pdf

                          So if you find a good deal on a used setup from a circle track or GT racer go for it!

                          Another option is a Ford 8.8 IRS diff from a Cobra. An all aluminum case and much more compact and wide range of non - quick change R&P ratios from 2.73 to 6.14 (6 ratios in the 3.x range and 4 in the 4.x range). There are lots of torsen, clutch, spool, and locker options for Ford diffs but the clutch diffs tend to be low plate count OEM style.

                          Lots of OEM Junkyard options for the IRS 8.8 and they weigh in at the same 70lbs range as the R200.

                          The Driveshaft Shop and others have a super heavy duty 9" IRS conversion diff. There are a billion ratios for 9" diffs and it's easy to swap pinions quickly.

                          http://www.driveshaftshop.com/kit-ca...-your-self-kit



                          I'm sure you could pay OS Giken to make a Ford 8.8 and 9" application though. ; )

                          @Bill RE. Axles - Isn't the issue with Nissan OEM axle bars is they are heat treated to a low depth? It might not be the best starting base to re-spline.

                          There are lots of shops (mostly 4x4) that will make custom cut and splined axles. Prices I've seen are around $175 to $275 per bar depending on material, length, and operations needed.

                          The folks at the Driveline Shop do a lot of custom axle upgrades using the Porsche CVs and might be a good place to start.
                          Last edited by Umai Kakudo; 02-24-2012, 11:29 AM.
                          The Nerd shall inherit the podium for knowledge is power.

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                          • #14
                            Cool, seeing pics of your fab work is always a lot of fun.

                            Why the complicated intake manifold design?
                            ~1992 240SX, SR20/Koni track day car
                            ~2016 M3, daily driver

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                            • #15
                              Originally posted by PerilousActs View Post
                              Truck guys shorten axles/shafts and spline them further down a lot. I don't think you should have any problems doing that. However, I'm not sure on the stock axles.

                              You guys running at 100aw this weekend?
                              We aren't running a car but I really wish I were spectating with Holowczyz being there. He is a legendary driver who I was lucky enough to see compete in GB in '99 and would love to have seen at 100AW.

                              Thanks Umai, I figured I would just call DSS as I need to send my DS to them anyways. I just see the 240 upgrades they offer with porsche CVs and they are like $1000. Too much for my lame budget.

                              Turtl, it is a dual plenum design with a tapered initial plenum to equalize flow to the cylinders. It is very common in motorsport turbo applications.
                              Last edited by bill@dentsport; 02-24-2012, 02:12 PM.

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