+ Reply to Thread
Page 2 of 4 FirstFirst 1 2 3 4 LastLast
Results 21 to 40 of 67
Like Tree26Likes

Thread: RX8 overheating; give up and get s2k?

  1. #21
    Not Certified Slow SDSUsnowboards's Avatar
    Join Date
    Dec 2011
    Location
    Orange County
    Posts
    1,717
    Liked
    742 times

    Default

    I put 30 track-hours on the stock factory motor on my MR2 Spyder, which has over 100,000 miles when I started. All I had to do was add an oil cooler and use the appropriate fluids. I even used the oem brake pads for a while and never experienced fade. Nothing ever broke, over heated, or needed any undue attention. If cheap, reliable, and not-a-Miata are you main objectives, then the Spyder is a good candidate.
    2001 MR2-Eleven
    Experience Points: 21
    Youtube Channel.

  2. #22
    Senior Member Silversprint's Avatar
    Join Date
    Jun 2008
    Posts
    827
    Liked
    143 times

    Default

    Quote Originally Posted by SDSUsnowboards View Post
    I put 30 track-hours on the stock factory motor on my MR2 Spyder, which has over 100,000 miles when I started. All I had to do was add an oil cooler and use the appropriate fluids. I even used the oem brake pads for a while and never experienced fade. Nothing ever broke, over heated, or needed any undue attention. If cheap, reliable, and not-a-Miata are you main objectives, then the Spyder is a good candidate.
    You still need to install a roll bar. The spyder also isn't a great car for long drives. It's more comfortable than an s2k but it has zero storage space to carry things. It's also not super fast. A street spyder does 2:07-2:10 at buttowillow.
    MR2 Spyder 2zz turbo
    Mazda RX7 FD
    Porsche 911E

  3. #23
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Quote Originally Posted by Stuntman View Post
    I raced an RX8 in Grand-Am and designed probably the best droo-in solution 3-pass radiator with Ron Davis. I would not go with an off the shelf Koyo or other brand. Either go all out with the best radiator you can, and oil coolers, otherwise go with the S2K. RX8s handle so well and I really like them but heat is their biggest issue (and fuel economy).
    Billy, what power and what temps were you seeing on hot days when not drafting? Apples and oranges, I'm sure, but still interesting to hear.

  4. #24
    Senior Member
    Join Date
    Sep 2013
    Posts
    232
    Liked
    137 times

    Default

    Rob,
    I would definitely try and solve the issues with the RX8 first. I bought my S2k explicitly for the reason you bought the RX8, as a easy track toy but the hidden downside in your use case is you cannot put luggage AND your track kit in it for a long trip (especially if there is a significant other involved). It has the cargo space of kangaroos pouch (until you remove the softtop and passenger seat, then it can get cavernous). This now means if i want to do a track weekend or a trip with my wife that might involve a track day, I'm towing it just to avoid the angry looks i got the last time i told here "Were going to Monterey for the weekend, you can bring anything you want as long as it fits in your lap".

    The S2K is a brilliant track car, and I ran mine nearly showroom stock for ~2years but it might be a tad out of your price range and wont be as practical as the RX8 is.


    My 0.02

  5. #25
    Senior Member bikeindirt's Avatar
    Join Date
    Jul 2007
    Posts
    380
    Liked
    258 times

    Default

    Quote Originally Posted by robburgoon View Post
    I just hope that it's my radiator that's bad and not an airflow issue dominating the situation.
    Assuming your radiator is not plugged, and is flowing correctly. You have a airflow issue... 90% of the time a bigger radiator is a workaround to an airflow issue...Find a way to get more air out of the engine compartment?

    BID
    bellwilliam and krazik like this.

  6. #26
    Pro Lurker GreyFocus's Avatar
    Join Date
    Apr 2007
    Location
    LA eerr day
    Posts
    2,038
    Liked
    103 times

    Default

    could buy my 370 come January, perfect street/track car in it's current configuration
    Last edited by GreyFocus; 12-01-2014 at 10:38 AM.

  7. #27
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Quote Originally Posted by anorexicpoodle View Post
    Rob,
    I would definitely try and solve the issues with the RX8 first. I bought my S2k explicitly for the reason you bought the RX8, as a easy track toy but the hidden downside in your use case is you cannot put luggage AND your track kit in it for a long trip (especially if there is a significant other involved). It has the cargo space of kangaroos pouch (until you remove the softtop and passenger seat, then it can get cavernous). This now means if i want to do a track weekend or a trip with my wife that might involve a track day, I'm towing it just to avoid the angry looks i got the last time i told here "Were going to Monterey for the weekend, you can bring anything you want as long as it fits in your lap".

    The S2K is a brilliant track car, and I ran mine nearly showroom stock for ~2years but it might be a tad out of your price range and wont be as practical as the RX8 is.


    My 0.02
    No SO and I typically pack for a week in a single soft backpack. No baggage issues No track kit to speak of either, just the helmet and tool bag (no, not Richard).

  8. #28
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Quote Originally Posted by bikeindirt View Post
    Assuming your radiator is not plugged, and is flowing correctly. You have a airflow issue... 90% of the time a bigger radiator is a workaround to an airflow issue...Find a way to get more air out of the engine compartment?

    BID
    Could look for a junkyard hood to cut holes in I suppose...

  9. #29
    Senior Member bikeindirt's Avatar
    Join Date
    Jul 2007
    Posts
    380
    Liked
    258 times

    Default

    on top of the hood, is not usually the best place to go looking for low pressure...

    BID

  10. #30
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Quote Originally Posted by bikeindirt View Post
    on top of the hood, is not usually the best place to go looking for low pressure...

    BID
    Wheel wells and under the car maybe?

  11. #31
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Called mazda. This engine has 80,000 miles on it. Original was replaced at 35k.

  12. #32
    Senior Member bikeindirt's Avatar
    Join Date
    Jul 2007
    Posts
    380
    Liked
    258 times

    Default

    I have never worked on an RX8... so it might be different,

    But for most production based cars....
    There is a bow-wave of high pressure that starts at the firewall... As you drive faster it moves forward... When it gets close to the radiator, the fun stuff starts...

    So to solve that you have 3 easy answers...

    1) Help air get out of the engine compartment...(vent to X)
    2) Keep you top speed down... (short shift for a couple laps)
    3) Reduce the amount of air going into the engine compartment (my personal favorite)

    The trick is to remember that the velocity of air going threw the radiator is the key... not the volume.

    BID

  13. #33
    Administrator ucfbrett's Avatar
    Join Date
    Jan 2009
    Location
    Ventura, Calif.
    Posts
    5,449
    Liked
    2242 times

    Default

    You should talk to the Mothers guys. They have raced RX-8s for years.

  14. #34
    Senior Member
    Join Date
    May 2007
    Posts
    10,979
    Liked
    1477 times

    Default

    I did lots of track days over a couple of years in my S2K ('03 AP1). I tore out the interior, removed the passenger seat, and installed a rollbar. I kept the soft top, and ran on track top up, except with NASA, which requires running top down.

    Anyway, the point of this post is I don't think the S2K's storage space is that bad, as long as you drive to the track by yourself. I had a square set-up, running 255/40/17 NT-01s on all four corners. I could carry two new wheels and tires on the passenger side (and with proper tire management, I never ran out of tires during any track weekend), my tools and duffel bag in the trunk, and had no problems.

    Quote Originally Posted by anorexicpoodle View Post
    Rob,
    I would definitely try and solve the issues with the RX8 first. I bought my S2k explicitly for the reason you bought the RX8, as a easy track toy but the hidden downside in your use case is you cannot put luggage AND your track kit in it for a long trip (especially if there is a significant other involved). It has the cargo space of kangaroos pouch (until you remove the softtop and passenger seat, then it can get cavernous). This now means if i want to do a track weekend or a trip with my wife that might involve a track day, I'm towing it just to avoid the angry looks i got the last time i told here "Were going to Monterey for the weekend, you can bring anything you want as long as it fits in your lap".

    The S2K is a brilliant track car, and I ran mine nearly showroom stock for ~2years but it might be a tad out of your price range and wont be as practical as the RX8 is.


    My 0.02
    The deposed former Sheriff of trackHQ . . .

    2006 Porsche 997 Carerra Coupe 6-MT - daily driver
    1992 Honda (Acura) NSX 5-MT - classic investment I couldn't resist and occasionally drive
    2004 Honda S2000 AP2 6-MT - track day car
    2006 Mitsubishi Lancer Evolution IX MR 6-MT - when I need a backseat, 4-doors, or a real trunk, and still want to haul ass . . .

  15. #35
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Quote Originally Posted by ucfbrett View Post
    You should talk to the Mothers guys. They have raced RX-8s for years.
    I did. They run a giant radiator and bigger oil coolers.

  16. #36
    "Shoe"
    Join Date
    May 2008
    Posts
    1,797
    Liked
    542 times

    Default

    Iirc they might be using the Ron Davis I designed. We were consistently 25-30*F lower water temps than the factory team Speedsource. Rarely did we go over 210*F and most of the time below 200. Oil coolers play a huge role on a rotary and we had up to 4 setrabs in series (2 big setrabs packaged better). Proper air tight ducting is always extremely important and a vented good would make a big difference as well, but we couldn't run one in Grand-Am.

  17. #37
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Quote Originally Posted by Stuntman View Post
    Iirc they might be using the Ron Davis I designed. We were consistently 25-30*F lower water temps than the factory team Speedsource. Rarely did we go over 210*F and most of the time below 200. Oil coolers play a huge role on a rotary and we had up to 4 setrabs in series (2 big setrabs packaged better). Proper air tight ducting is always extremely important and a vented good would make a big difference as well, but we couldn't run one in Grand-Am.
    Was your ron davis a multipass?

  18. #38
    RaceTape Ninja Force McCocken's Avatar
    Join Date
    Feb 2012
    Location
    Roswell, GA
    Posts
    1,438
    Liked
    742 times

    Default

    E46, 330.
    Yer pal,
    Force

  19. #39
    Member
    Join Date
    Aug 2007
    Posts
    54
    Liked
    4 times

    Default

    His post says triple pass.

  20. #40
    Senior Member robburgoon's Avatar
    Join Date
    Jan 2008
    Posts
    6,853
    Liked
    1429 times

    Default

    Quote Originally Posted by Red Mist View Post
    His post says triple pass.
    Ah yeah, that's right.

+ Reply to Thread
Page 2 of 4 FirstFirst 1 2 3 4 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts