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Coolant hoses / lines for road course

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  • Coolant hoses / lines for road course

    What are you guys using for cooling hoses / lines for track days?

    I have had two track days end with coolant lines bursting. One was below the intake manifold, it produced a pin hole leak that was hard to see. Another was the coolant line from the turbo to the back of the block. It was an ISIS supposedly stainless steel line. The shop that did my engine rebuild used those instead of the circuit sports ones I had on there.

    I have to replace the coolant line from the back of the block to the turbo, was going to use the circuit sports one. I was thinking of Samco silicone hoses for the radiator hoses but didn't see an option for all the other coolant lines.
    Chicago Region SCCA SM # 688 http://www.scca-chicago.com
    TSSCC SM # 688 http://www.tsscc.org

  • #2
    I found this parts list on zilvia when I was looking into it:

    http://zilvia.net/f/tech-talk/353261...er-intake.html

    I am about to order another set of DIF bottom mount coolant lines as my turbo coolant lines' fittings have stopped swiveling after being reinstalled a couple of times. The DIF kit is on sale at FRsport right now for $114 shipped.

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    • #3
      Original oem on all those hoses under my IM ..
      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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      • #4
        Well, I got to the bottom of the ISIS line. It is pretty clear that it melted because it touched the exhaust manifold. After inspecting it, they are pretty cheap. I wouldn't recommend them. It could have been due to more G's with the splitter as I hadn't had an issue with it for 2 years. This happened on my first full session with the splitter.

        I have a true stainless steel braided one on there now. I made sure to trim it short so it can't touch the exhaust manifold. While I'm at it I'm going to replace my radiator hoses with 4 ply silicone and my thermostat (currently stuck open) with a Nismo one.

        If Matt can do full races with the OEM stuff, I should be able to do 20 minute sessions on it as well. So for now I'm gonna leave the OEM stuff under the intake manifold. If I ever have a reason to pull it off, I'll change that out to silicone as well.
        Chicago Region SCCA SM # 688 http://www.scca-chicago.com
        TSSCC SM # 688 http://www.tsscc.org

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        • #5
          even with the SS lines you should still put a fire sleeve on it if it's close to the manifold/turbo. SS lines aren't SS throughout, just the outside is braided in SS. the insides can still melt. most cars you see with exposed SS lines near the turbo/manifold don't track their cars. http://www.anplumbing.com/Hose/Flame+Guard-44.html the first one is what i use. it's a PITA to get on, but once it's on it stays on.

          for other coolant lines on the intake side oem is ok. just dry rot and constant heat cycling makes them a wear item after a few years. i've had to replace a few of mine just due to old age and cracking.

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          • #6
            Gawdzilla, I did put a fire sleeve on the new one. Guess I should have mentioned that.
            Chicago Region SCCA SM # 688 http://www.scca-chicago.com
            TSSCC SM # 688 http://www.tsscc.org

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            • #7
              I always change the one behind the block to go to a fitting I add in the head outlet. You can just drill and tap it, no welding required. You can use the stock lines and reposition them or ss.

              On the other side of the block, there are 2 hoses from Napa that fit great from the sr lines(after cutting off the one that goes behind the head). I can give you the numbers if you want.

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