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Thread: New-To-Me 2002 Corvette. HPDE Questions

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    Senior Member bellwilliam's Avatar
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    Quote Originally Posted by fatbillybob View Post
    William...Remote clutchline bleeder may solve problem if system not too fouled or high mileage. Black clutch fluid in reservoir is bad.
    Route PCV orifice on valley cover to catch can then back to intake manifold vacuum. I'm too lazy to empty catch can so i do vapor seperator/can draining back to sump via modified dipstick with check valve. CF is a good place. I have learned alot there. Some BS but you learn who is shoveling it after a while.
    Carl: thanks for the advice. is clutch line bleeder a big job, something done while doing the clutch ?
    do you recommend running 1 quart engine oil over for track day like owners manual says ?
    Last edited by bellwilliam; 02-13-2018 at 09:40 AM.
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    Do the SCCA T1/T2 C5Zs run transmission and diff coolers?

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    Chest hair required Olitho's Avatar
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    Quote Originally Posted by MikeColangelo View Post
    Do the SCCA T1/T2 C5Zs run transmission and diff coolers?
    To my knowledge most do. For short super sprint races they may not be required, but for 35 minute SCCA races on a 110 degree day I would advise using them.
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    Not Certified Slow SDSUsnowboards's Avatar
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    Seems like you are doing all that can be done, William. I think the hood vents are key. The engine bay is fairly closed off. I can't imagine air has an easy time escaping after passing through the radiator.

    I might be heading to Laguna Seca in two weeks if the Vette is done by then. $200 for the entire weekend if you know a Mazda employee. It's a fast moving track, so cooling will probably be as good as it can be. I have a bunch of racing oil sitting around. Good to 400 degrees before breaking down. Expensive as baby's kidney. What are you using right now?
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    Senior Member robburgoon's Avatar
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    I'd be tempted to just cool the diff and see if that keeps the trans warning light off.

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    Senior Member bellwilliam's Avatar
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    I am not one of those oil snob, I am good with them as long they are name brand and full synthetic. For track cars I use 0w-40, 5w-40 for most. 5w-50 (these are now lot rarer at retail stores for some reason) is what I prefer though for engines that runs hot. I am thinking trying 10w-60 for The Vette. Want to do that in my GT350R also as it ran 295F in warm weather, but it is under warranty. So factory recommendation is what I am going with (Ford 5w-50).
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  7. #127
    Senior Member bellwilliam's Avatar
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    Quote Originally Posted by robburgoon View Post
    I'd be tempted to just cool the diff and see if that keeps the trans warning light off.
    What’s the thought behind that ?

    I just bought this to try. Looks like a 10 minute install.
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  8. #128
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    With apologies to the hijacked OP, if anyone building a spec vette 02+ z06 wants to sell their healthy h-pipe, send me a PM.

    For anyone keeping the stock seat, I would suggest bracing the back. The recliners will wear out, and you will need to start bracing it eventually...may as well start early.

  9. #129
    Faster than Oli jimt's Avatar
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    Quote Originally Posted by MikeColangelo View Post
    I have a few questions:
    1. Which engine, trans, and diff oil (brand and weight) do you guys recommend? (the guys on CorvetteForum say to avoid Mobil1)
    2. What's the consensus on installing the double valve springs vs standard single ones? Which valve springs do you recommend?
    3. Is there a good Corvette shop in the Los Angeles area that you recommend? I'm new to Vettes and don't mind shopping out certain work (such as valve spring replacement).

    Attachment 11412
    1. Amsoil
    2. OEM are fine. No brand including OEM should be trusted after 2 years of track use. Replace every 2 years.
    3. American Heritage Performance, Harbor City CA. Home
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    Quote Originally Posted by bellwilliam View Post
    I am running Dewitt racing radiator with built in oil cooler. distilled water + wetter. I did seal around the radiator. I also JUST (after SoW, before ACS) added Trackspec hood vent. water temp is no problem now, only saw a max of 204F at ACS, but oil temp was 285F, which is fine. but this was a relatively cool day for SOCAL (75F). I am worried in a 100F day and drafting, oil temp will be 310-320F (that might still be okay ?).

    I also did run into high transmission temp warning (per post earlier, only z06 has the sensor ?), somewhere I read that means it is ~280F+ to trigger transmission temp warning ?

    my plan is to wrap sections of exhaust near transmission, and wrap clutch line.....per Tway's recommendation.
    I hate installing transmission and diff cooler. just a ton of more failure points imo. But if transmission and/or diff temp stay high. might just have to.
    More notes:

    300F oil is meh ok, but you should replace it after that weekend. Dewitt's radiator with external oil cooler works great. Install the cooler either before or after radiator. Both work fine. 100F day, our max oil temp is about 250F. Water is 210-220F.

    All C5 owners should install a transmission oil cooler. The diff will benefit from a cooler as well. But I ran without one for 5 years. You just need to replace the diff oil more often and know the diff will wear faster. My diffs lasted 3-4 year without coolers.
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    Faster than Oli jimt's Avatar
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    Quote Originally Posted by bellwilliam View Post
    Carl: thanks for the advice. is clutch line bleeder a big job, something done while doing the clutch ?
    do you recommend running 1 quart engine oil over for track day like owners manual says ?
    It's an easy job if you are already doing the clutch. You need to access the slave cylinder to install.
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  12. #132
    Senior Member bellwilliam's Avatar
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    Quote Originally Posted by jimt View Post
    All C5 owners should install a transmission oil cooler. .
    DRM transmission cooler ?
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    Quote Originally Posted by bellwilliam View Post
    What’s the thought behind that ?

    I just bought this to try. Looks like a 10 minute install.
    Thermo-Tec 11630 3' X 6" Pipe Shield https://www.amazon.com/dp/B000GVQZ8Y..._0FZGAbR5TPKKM
    The idea would be less oil and maybe higher temps in the diff, so send that to the cooler, and since the transmission is bolted to it, it should pull some heat from there too.

    Or go the other way. The idea is you may not need coolers for both since they touch housings.

    Edit: Also, I figure you already have a temp sensor on the trans. (maybe it could be moved to the diff? haha!)
    Last edited by robburgoon; 02-13-2018 at 08:03 PM.
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    Not Certified Slow SDSUsnowboards's Avatar
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    I now feel hesitant to get the dewitt oil/water radiator, model 1139197E.
    Which external oil cooler is favored?
    Is the stock radiator up to the task if I put the external engine oil cooler behind or in front of it?
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    Quote Originally Posted by jimt View Post
    1. Amsoil
    2. OEM are fine. No brand including OEM should be trusted after 2 years of track use. Replace every 2 years.
    3. American Heritage Performance, Harbor City CA. Home
    Thanks, Jim!
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    For track use, what's the word on the 50th Anniversary Corvette wheels. I believe they're aluminum and not magnesium. How well do they hold up to track use (i.e., susceptibility to cracks and bends)?

    Here's a picture of these wheels on a 50th anniversary Vette (not mine):


    270407.jpg
    Last edited by MikeColangelo; 02-17-2018 at 04:19 PM.

  17. #137
    Chest hair required Olitho's Avatar
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    I have never heard any of any issues with those wheels or any of the GM OEM Corvette wheels breaking.
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    Quote Originally Posted by bellwilliam View Post
    DRM transmission cooler ?
    It depends on where you want to put it. The DRM coolers are installed behind the rear Z06 brake scoops. If you don't have the brake scoops (non Z06), you can buy them and install in same location. I have both the DRM trans and diff coolers and they completely solve the problem.

    Others fab their own system and put the coolers in the trunk. This requires cutting up the tub and using a pusher fan. That works too.
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    Quote Originally Posted by SDSUsnowboards View Post
    I now feel hesitant to get the dewitt oil/water radiator, model 1139197E.
    Which external oil cooler is favored?
    Is the stock radiator up to the task if I put the external engine oil cooler behind or in front of it?
    Most don't make it very long with the stock radiator and either get a Dewitt's or Ron Davis. Both work well.

    Typical location for the external oil cooler is mounted on the lower radiator support bar in front of the radiator. DRM sells a kit that mounts there. There are a bunch of other mounting options but I'm not sure how many would work with Spec Vette. Some put in the headlight area (with deleted headlights). I have mine mounted behind my radiator but the radiator is laid down.
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  20. #140
    Senior Member bellwilliam's Avatar
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    my lap yesterday afternoon at ACS Roval. sub 1:50

    same sticky clutch issue (I did flush with SRF this time)
    high transmission temp warning is gone for now, I did install a exhaust wrap near transmission, not sure if that helped.

    Last edited by bellwilliam; 02-19-2018 at 07:53 PM.
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