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    • Top Speed Motorsports 4.1 liter stroker GT-R with ETS Pro1400 turbo kit hits 1412 awhp

      Another day, another monster GT-R. This one was built by Top Speed Motorsports and they did a 4.1 liter stroker build for the VR38DETT. The built motor was necessary to accommodate the ETS (Extreme Turbo Systems) Pro1400 turbo setup.


      It is tuned on a Motec M1 and the mod list is included on the graph:


      Obviously it take a bit of time to spool but the power holds pretty nicely to 8k rpm.

      This is more a street/strip build according to TSM:

      The goal was an animal of a dual purpose car that he could run on the circuit track and then turn up to make well over 1000hp at the drag strip and on the street. I wanted to build him something with super smooth power applications, quick but not too quick transient boost, and great reliability. High HP road race cars are tricky to get right. You want something that is going to spool quickly AND have quick transient boost response. Lots of people think those are the same thing but they really aren’t. At the same time you can’t build something that comes up so quickly that it shocks the tire in the middle of a corner while the power is coming in. Some of this is for sure in the tune, but the combination of the right engine, cam, turbo, and AR housing is equally as important as a very proper road race tune.

      So for this build we spec’ed out a 4.1 stroker. We specifically built it with oiling modifications for the high lateral Gs the car is going to see. Then we did a fully custom spec port job combined with a smaller cam than we would usually use on an all out “drag” version of this build. As I said above, working out the combination to make it WORK for the client.

      With the 4.1 we wanted a turbo kit that would meet the balance of needs. This was honestly a no brainer! The Extreme Turbo System (ETS) Pro1400 was the way to go. The Pro1400 packs a LOT of punch and is a very, very efficient package. There are turbo kits out there that you can push to make power, then there are the turbo kits that do it efficiently. We can see that in things like drive pressure, boost pressure, and timing how hard we are leaning on this particular kit/combo to make the goal HP. The Pro1400 includes not only what I feel is the best manifold on the market, but also smoothly designed 3.5” intakes and 3.5” downpipes which make a great deal of difference. Combine that with the external WG dumps so that the downpipes don’t have to be over worked at lower boost and the combination is simply awesome!

      We combined the mechanical portion with a pretty unique Motec M1 setup. The Motec gives us all kinds of control over not only the ECU strategy but also of course the ABS side of the traction control and now the output to the FWD clutch. The tuning that went into this road race build was for sure something I’m proud of. We installed a user selectable traction control switch so that based on the tire and track the customer could control his “intrusion” amount of the motorsports style closed loop traction control. We also provided him with two maps to load up to the Motec. One of them being a street map and the other being an all in one circuit map. The two tunes completely change the way the power comes in and how progressive it is. They also change how the traction control works and how the FWD clutch implements its effect on traction mid corner. Needless to say we had fun with this one!
      The only thing we want to know is, how much money for a GTR like this with a Motec?








      This article was originally published in forum thread: Top Speed Motorsports 4.1 liter stroker GT-R with ETS Pro1400 turbo kit hits 1412 awhp started by Sticky View original post