Tremec 3160 Speed Calculator For GT350 and GT350R

Discussion in 'GT350 and S550 Technical Forum' started by VoodooBoss, Oct 31, 2015.

  1. VoodooBoss

    VoodooBoss Rick Moderator

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    Someone created this spreadsheet for the BOSS and I updated it with the two tire sizes for the 350's. The Ford engineer I spent a lot of time talking to told me that the lower ratio of the shorter R tires was part of the performance improvement. No surprise as the shorter and lighter wheel setup I ran on my BOSS was a noticeable improvement over my street tires/wheels. Anyone up for a 280 MPH top speed run? ::)

    @cloud9
    @Black Boss
    @Moto
    @fuhrius

    Click on the image to enlarge it.

    [​IMG]
     
  2. TMSBOSS

    TMSBOSS TMO Addict

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    0-55 in first gear. Impressive.

    I'll pass on the 280. Gas and brakes cost enough going 145.
     
  3. cloud9

    cloud9 Gary

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    Yea when I was looking at this earlier this morning I thought there won't be that many tracks where you'll go to 5th, although I am probably going to be setting my shift light between 7500-7700 as I'm not sure you'll need to run it to redline....especially if you don't want to overheat the oil. That would have me shifting to 5th in similar places on the track at Road America and allowing me to run to the top of 4th going into turn 3 at MPH without feathering.
     
  4. Black Boss

    Black Boss TMO Addict

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    Interesting data points.

    Obviously most of us are running shorter tires than stock on the Boss. For the GT350, 19" Hoosier 315's are also shorter than the R's Sport Cup 2's. 5th will be needed at Mid Ohio, Watkins Glen, VIR and, likely Grattan, in addition to RA. Like MPH the approach to T3 at VIR should't require feathering (in 3rd).
     
  5. VoodooBoss

    VoodooBoss Rick Moderator

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    If anyone wants the spreadsheet let me know. I've been comparing my Boss track tires in this to see if and where shift points might be different. I don't think there will be much different for me at my local tracks but there might be.
     
  6. cloud9

    cloud9 Gary

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    Are you thinking you'll run the 315/30 or 35 profile? The 35 profile at 27.3" is pretty close to the stock diameter of 27.41. I'd really like to run the 325 in the rear but am not sure it will fit. It does take a 12" wheel.
     
  7. VoodooBoss

    VoodooBoss Rick Moderator

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    I think you want to run the shorter R tire or even a bit shorter. The car is geared higher than our Bosses.
     
  8. cloud9

    cloud9 Gary

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    The only consideration would be the additional heat generated on the shorter tires later in a session due to the higher revolutions.
     
  9. Black Boss

    Black Boss TMO Addict

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    I'm planning to run the 30's -- they're the closest to the Stock R (26.44") at 26.1", the same profile as the R and 4 pounds a corner lighter that the 35's.......

    Will look at 325 on the rear if they fit -- to maintain 10mm of stagger -- they are 26.8" with only a pound of added weight versus the 315/30's
     
  10. cloud9

    cloud9 Gary

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    Wow 4 lbs per corner, agreed the 30 makes more sense. That's the route I will go as well. Rick and I are exploring some custom wheels that hopefully will allow a 12" rear with a 325 but won't know how much clearance we have until we get the cars.
     
  11. Black Boss

    Black Boss TMO Addict

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    If you're looking custom, check out CCW -- my 11" rears are just over 23lbs, and a bit lighter than the 10.5" fronts at just under 25lbs (offsets make the difference). Let me know what you find -- I think ideally 11.5"/12" F/R would be the best option if they fit....
     
  12. cloud9

    cloud9 Gary

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    We"re checking with Finspeed. Will definitely let you know what we find out.
     
  13. VoodooBoss

    VoodooBoss Rick Moderator

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    I was told a 19x11 Finspeed F110 was 23 pounds on a Z/28 and that's my max target weight. If 18's fit that's even better as they will be lighter.
     

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