The Ted Race Team: Because Racecar

Discussion in 'Hangar Talk' started by Ted, Dec 18, 2020.

  1. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    Did get those front calipers (with pads) on the car today. I haven’t yet got new brake hoses coming (that’ll probably be a tomorrow order) but if I still haven’t found rebuilt rear calipers by then, I may bleed the fronts and then just use hydraulic pressure from the brake system to force the rear pistons out, assuming other methods don’t work.
     
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  2. Half Fast

    Half Fast Final Approach

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    What pads did you get? I always ran Hawk Blue in the front and Hawk Black in the rear as that seemed to give reasonable brake bias without needing an adjuster.
     
  3. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    I got Hawk Blues front and rear. When I searched, I couldn't find the Hawk Black rears. I looked for that first since it's what you'd suggested as a proven good combination. But, I guess these cars are getting harder to find parts for all around...
     
  4. Half Fast

    Half Fast Final Approach

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    Yeah, probably true. You need to connect up with some RX7 racers, do a little networking, and learn how people are keeping them on the track these days. My knowledge is badly outdated.
     
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  5. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    Also got the hoses on the way, so I'll at least have that.

    I should join an RX7 forum and start poking around there some...
     
  6. Half Fast

    Half Fast Final Approach

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    Be sure to sign up with Mada Motorsports. Those folks are VERY helpful and they know most of the Mazda racers in the country. They were a terrific resource for me when I was racing.
     
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  7. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    It’s been a rough past couple of weeks here. There wasn’t much on the calendar this afternoon and my wife had the kids out, so I took the afternoon to be in my shop and have some zen time. Most of this was focused on the RX-7.

    I had the front calipers on that arrived, but I also ordered new brake hoses all around. Put those on the front calipers as well as replaced the one going to the rear axle. After that I took care of replacing the fuel hoses around the rear of the car from the tank, to the pump, and up forward as well as replacing the filter. The old ones were bad enough that they started leaking when I touched them. There are still a couple at the tank that I have to drop it to replace, I’ll get them. But that can wait until after first drive.

    Then there was the oil cooler hoses. This ended up being really simple. I cut the crimping ends off the existing hoses and the fittings are just fine. So new hoses are coming and I’ll use hose clamps. That’ll be sufficient for the pressure. Once the hoses are on I can try starting it with the rebuilt carb.

    So now, it’s really just two things before I drive it:

    1) Mounting/wiring the battery box in the interior
    2) Rebuilding the rear calipers.
     
  8. Half Fast

    Half Fast Final Approach

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    Be sure moving the battery to the interior is allowed by your sanctioning body. We weren’t allowed to do that.
     
  9. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    It is, that’s why I’m doing it :)

    Well that and because it makes it easier for me to hook up the oil cooler hoses with where the new one is.
     
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  10. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    Oil cooler hoses are on, which means it could run without making an enormous mess. The JIRA tickets are getting checked off…

    I haven’t run the car since rebuilding the carb, so that will be a whole other question of whether I screwed that up. I don’t think I did though, but it is a complicated thing. Once I get the battery box in I’ll probably start it in case there are other things I need to order or repair.
     
  11. Half Fast

    Half Fast Final Approach

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    Have you replaced the trans and diff fluids? IIRC, I was using Redline for both. Once you get it moving, see how well the LSD is working and whether it needs rebuilding. It has non-stock 4.88 gearing.

    FYI, RX7 transmissions had notoriously bad synchros, especially 3rd gear. At race speeds, plan on heel-&-toe double clutch shifting.
     
  12. Spring Ford

    Spring Ford Line Up and Wait

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    Who would consider anything else?
     
  13. Half Fast

    Half Fast Final Approach

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    Showroom stock racers.
    ;)
     
  14. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    I changed the trans and diff fluids over this winter. I went with Mobil 1, but may put something different in after a race or two. The first goal was just to get rid of the old stuff in there. At this point all the fluids are new, all rubber is new (tires, hoses, master and slave cylinders, bushings...). With it in the air, the LSD seems like it's working well. We'll see what it does when driving it.

    But you really hit on my plan there. Get it driving, register and drive it, see what needs adjustment and tweak accordingly. Try to get to the first track/race day prepared with a car that I think will survive, learn and adjust as appropriate. We were looking at the Lemons schedule over dinner and it looks like starting in August onwards there are several events we might be able to make, and I'll be looking at closer events as well.

    One thing with Lemons is that they apparently like weird and goofy ideas to get more power. Being a fan of Engine Masters, this therefore has me thinking about adding a salad bowl:

    upload_2022-6-19_21-25-27.jpeg

    Yes, it's a real thing, it makes horsepower (on the dyno). No, I won't do it on the RX-7, it's not practical at all and I'd have to mangle the hood, which I don't want to do. But you are allowed to make interesting modifications so long as you don't exceed your budget for purchase/mods. Porting would be allowed, so that may be something I look at at some point in the future. Not now, of course - but things to consider for the future.

    Thanks for that tip. I have a lot of mechanical sympathy, and definitely follow the motto of "In order to finish first, you must first finish." I double clutch the truck quite a bit. :)
     
  15. Half Fast

    Half Fast Final Approach

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    Does Lemons require a competition license? Do you have to attend a racing school?
     
  16. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    You have to have a Lemons competition membership, but that's it.
     
  17. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    I wired up the battery in the cabin and, well, I couldn’t resist starting it. :)

    https://youtube.com/shorts/W0j_T1N1Cow?feature=share

    I was surprised at how well it idled before any adjustments. I adjusted the idle to around 1000 RPM since it should be a bit higher with the underdrive pulley. When I got it running the first time it went up to around 5000 RPM and it wouldn’t come down no matter what I did. The carb was also pretty rough after sitting (no surprise).

    So now I better get moving and get those rear calipers rebuilt - I want to drive this thing! :D
     
  18. Half Fast

    Half Fast Final Approach

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    Yep, still sounds like a race car!

    :D
     
  19. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    Because racecar! :D
     
  20. Half Fast

    Half Fast Final Approach

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    If you have never raced before, I highly recommend you attend a school. Skip Barber or equivalent would be a good investment.
     
  21. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    That would also be a really fun date weekend, like when did the BMW motorcycle course. I like this idea…
     
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  22. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    Rear calipers apart and cleaned, ready to go back together. Unfortunately one of the o-rings is incorrect for it with the Raybestos kits I ordered, so now I’ve ordered the genuine Mazda kits. Shouldn’t take long to get back together once I have that figured. The caliper design is an interesting one, as well as the hand brake mechanism.

    Get those back together and on, bleed the rear brakes, and we’ve got a driver! Also need to do the battery hold down in there but that’s not needed to drive it. I’ll try to get it done anyway.

    B883D1E4-94F3-43B3-B29C-AB7A2FEC094A.jpeg
     
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  23. 3393RP

    3393RP En-Route

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    Did I make an earlier mention about a guy I know that specializes in refurbished calipers? He does quantity jobs as well as onesies. They'll come back with properly applied plating, new bleeders, puck replacement, seals, etc. He does a lot of work in vintage Porsche stuff, racing, and exotics.
     
  24. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    You may have and I may have forgotten. At this point I've got rebuilt fronts and also have the rears apart and ready to go back together, so if these don't work out, I'll ping you for his contact info.

    Yesterday the genuine Mazda rebuild kits for the calipers showed up, and I got the O-rings on, lubed up, and started putting one together. I didn't finish it (had some other things distract) but hopefully later this week I'll get them both done, on, and bled. With any luck, next week I can actually drive it.
     
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  25. Half Fast

    Half Fast Final Approach

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    What brake fluid are you using?

    BTW, it might make sense to rebuild the master while you’re at it.
     
  26. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    Motul DOT 5.1.

    I replaced the master, clutch master, clutch slave, and all associated hoses already. :)
     
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  27. Spring Ford

    Spring Ford Line Up and Wait

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    i tried that but the divorce didn't work out very well.
     
  28. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    Ladies and gentlemen, we have a driver:

    upload_2022-7-14_7-9-45.png

    I managed to get the brake calipers rebuilt, rear brakes bled, and got it out of the shop for an initial short drive. An oil hose popped off (oops), I'll need to look at alignment more, and the brakes need bled more. But that's the list. Got a few more parts on the way. But so far, nothing much to complain about. I'll need to drive it more to get more impressions.
     
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  29. Racerx

    Racerx Pattern Altitude

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    Ted, you got me hitting up racingjunk again. If I had a spouse she'd probably be upset. But it's just the dog...but the dog could tell I was contemplating taking time off her hunting season. So no dice...for now.
     
  30. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    I had a little bit of time to work on the RX-7, tidying up some details. After the oil hose popped off on the first drive, I got better hose clamps. I knew the ones I had were just barely the right size, and when I pulled the old ones off, it looks like I may have forgotten to tighten them in the first place on the engine. So this will hopefully fix the problem.

    I also adjusted the alignment. In doing so, I realized that I hadn't tightened the radius arms, and so the caster wasn't fixed. Oops. I also had a LOT of toe out, which was just how the tie rods went together. So I set it to more of a 0 toe, and tightened the radius arms down for minimum caster, which theoretically should make the car pretty responsive handling wise. I need to drive it some to see.

    The windows were also very oxidized after sitting outside for 10 years or so. Cleaning them didn't seem to do much, but my contractor suggested I try some very fine steel wool with glass cleaner to get it off. Sure enough, worked like a charm. I wouldn't call the windows "like new" and it'll probably require some more work, but I can now absolutely see out of them well, something I couldn't before. A major improvement.

    @Half Fast is a good bit shorter than I am, and so his seat was... very far forward. I hadn't looked closely before (or I did but forgot - that seems likely too) but the seat back was connected to the rollbar, with pins going through. I removed the pins and was able to slide the seat back further, in a much better spot for my height. Now I can sit in there quite comfortably. I'm still going to plan to replace the seat anyway, but for now, this helps.

    Hopefully over the weekend I can drive it some more, and maybe even take it to get legal/registered next week. Not that registration is the goal of the car, but it is an important part of being able to drive it around and try things out with it. And it's nice getting some of these little details worked out on it.
     
  31. Half Fast

    Half Fast Final Approach

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    Be sure to drill new holes for the pins with the seat back. That connection (and the bend in the bracing plate) is needed for safety. The seat requires the extra support, but it also needs a little “give” which the bend provides.

    SCCA required that brace. I don’t know whether Lemons does, but you want it there regardless.
     
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  32. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    That was my intent, yes. For now, this just lets me drive around on the street more comfortably. :)
     
  33. Half Fast

    Half Fast Final Approach

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    BTW, I did the connection with holes and pins because it made it easy to reposition the seat for a co-driver during a pit stop in an enduro.
     
  34. Ted

    Ted The pilot formerly known as Twin Engine Ted

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    That's what I figured, and that makes a lot of sense, especially given that I'm expecting this to be a team with people at different heights.