Big SC's Big SC FRS Build

Discussion in 'Cars' started by Big SC, Apr 7, 2016.

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  1. Castillo817

    Castillo817 Silver Member

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    Sounds like a good deal, but I have 17x9s. Wonder if that will be too much of a stretch with those tires?
     
    Castillo817, via a mobile device, Aug 26, 2016
  2. Redline

    Redline The Notorious R.E.D. Gold Member

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    9" are great for 245s. Some would argue that's in the ideal range for them, actually. If your rims aren't wide enough for the tires, handling is negatively impacted. I really should be running more than 8" for my 245s. Ask @phate for a much better explanation.
     
  3. CorkSport - Derrick

    CorkSport - Derrick Approved Vendor

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    Nitto says it will work, from their webpage.

    Approved Rim (Measuring Rim) Width (In.) 7.5-(8.0)-9.0 1521 @ 51

    Looks like 8 inch is recommend and 9 is doable.
     
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  4. Redline

    Redline The Notorious R.E.D. Gold Member

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    Good info from the manufacturer. Gotta remember that not all 245s are created equal, so I'd definitely listen to Nitto.
     
  5. VTMongoose

    VTMongoose John/MD1032 Platinum Member

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    Agree with others. Tire sizing is pretty nebulous and they should fit fine. Just be aware you'll have some speedo error because they're a 45 ratio instead of a 40. Personally I use a 235/45/17 for my track/autocross setup. Mine have about a 2 MPH error and I'm used to it by now. Just need to use a GPS to estimate your speed error and keep an eye when you're cruising on the highway (make sure not to exceed the speed limit). The advantage of a 45 ratio is cost. They are slightly cheaper than an equivalent 40 ratio.
     

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  6. Redline

    Redline The Notorious R.E.D. Gold Member

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    This assumes the ratio is correct for Speed 3s in the first place. I wonder if the engineers made adjustments for Speed 3s. For all we know, only stock Mazda 3s are right-on (and they run a different tire size)... Anyone know for sure?
     
  7. VTMongoose

    VTMongoose John/MD1032 Platinum Member

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    Uhhh...right, so, remember how I was talking about comparing your speedo speed to GPS speed? The stock tire size and rims are bang-on, at least in my car.
     
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  8. Redline

    Redline The Notorious R.E.D. Gold Member

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    Good to know. But I wonder how accurate GPS speed is? I think the most accurate test would be one of the various types that police use, but I'm not sure. I also wonder if changing gear and/or final drive ratios have an impact in ATR. I'm guessing they don't; I think the speedo is mechanical. It would be nice, though. Speaking of which, I really wish we had a way of fixing our tachometers. They already read ~400rpm high at redline.

    Anyways, I won't muck up this thread more with this digression.
     
    Last edited: Aug 27, 2016
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  9. Big SC

    Big SC Not so quietly queer Silver Member

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    free bumps anyway.
     
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  10. Big SC

    Big SC Not so quietly queer Silver Member

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    300/300ish final numbers.
    --- Double Post Merged, Sep 9, 2016 ---
    might switch over to a turbo kit eventually though.
     
  11. Redline

    Redline The Notorious R.E.D. Gold Member

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    FWIH, turbos are much better in terms of engine longevity because superchargers cause forces on engine bearings that cause premature wear.
     
  12. CorkSport - Derrick

    CorkSport - Derrick Approved Vendor

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    only 300? Sanda Panda, I was thinking you were supposed to be the 350 range.
     
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  13. Big SC

    Big SC Not so quietly queer Silver Member

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    yeah well looks like turbo might be in my future. FWIW the last 100 hp could be had with more compression than 10:1
     
    Last edited: Sep 21, 2016
  14. Big SC

    Big SC Not so quietly queer Silver Member

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    first page for dyno chart
     
  15. Big SC

    Big SC Not so quietly queer Silver Member

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    The replacement is more displacement: First pic Scat Pack.jpg
     
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  16. CorkSport - Derrick

    CorkSport - Derrick Approved Vendor

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    Trade it in?
     
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  17. Big SC

    Big SC Not so quietly queer Silver Member

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    yeah, got just enough.
     
  18. Big SC

    Big SC Not so quietly queer Silver Member

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    Garage Challenger.jpg
    Taken with a Galaxy S7 edge.
     
  19. Big SC

    Big SC Not so quietly queer Silver Member

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  20. Redline

    Redline The Notorious R.E.D. Gold Member

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    See the receipts for all the work, do a compression/leakdown test, etc? That's a ton of mods; buying modded cars can either be very good or very bad depending on your due diligence....
     
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