patsmx5

iTrader: (16)

What happened when you took it off, how did it drive? When was it bad? IE, all the time all over the place, darty on accel or decel?

miata2fast

iTrader: (2)

If you keep the car straight, you are ok. If you get out of the groove and the car starts to sway, game over. Not really likely to happen in my N/A car, but it was still very unnerving. Your car is much more likely to get out of line because of the power. Consequences are pretty steep.

Besides, I did not see any better gains in 60' by removing it. The only gain you have is weight reduction. The trend is to keep the car from leaning to one side during a hard launch, which the anti roll bars help reduce.

patsmx5

iTrader: (16)

I will leave the front bar hooked up for now, but will probably try a launch-only (to check 60' time) with the bar unhooked just to see what difference it makes. If no diff, won't try a full pass with it unhooked.

So, an update. I'm going through the rear suspension right now.

I got the rear suspension apart, and removed all the old bushings. They didn't look that bad to be honest. Hopefully the poly are stiffer.

Also removed the hubs and knocked out the wheel bearings from the uprights. Those suckers were IN THERE, what a big pain. I got new hubs/bearings today so installed those. Old hubs looked fine but I've seen the pics/vids of hubs failing so those got replaced. I tired heating the uprights and freezing the bearings to see if that would help installing them. They were a 6 thousandth interference fit when at the same temp! First upright I heated to 250, that one was a big pain to install. Had to hammer it in using an old bearing as a drift to tap the outer race. It was easier than removing the old ones but it didn't just fall in. Second upright I heated to 300, it was about the same, still a pain to install but better than removal went. New seals as well, and c-clips.

Got the A-arms cleaned up, inspected, and installed with all the new parts. I didn't install the springs/dampers yet. Once the control arms and uprights were installed, I put the eccentrics to the middle position, leveled the chassis, and then used a jack to pickup the suspension to ride height, and to 1" compression and checked the camber. At ride height, both rear wheels showed 1* of negative camber. With 1" of compression, both showed about 2* of negative camber. I was able to max the ecentric bolts to get it to 0* camber at ride height, and it goes to about .7-.8 with 1" of compression. I plan to have it sit at ride height, and hopefully only compress an inch or so on launch with stiffer springs.

Now waiting on springs, then it's all back together.

This is prob a dumb question, but on the rear wheel bearings, I torqued the big 32mm nut to 170 ft*lbs. After doing this, both rear wheel hubs are really hard to turn. Is this normal?

dc2696

iTrader: (2)

Really hard sounds not right, they turned freely/smoothly before installing the upright in the car right? When you pressed the hub in you supported the back of the inner bearing race or forgot then pushed it back the other way (has happened before..)?

patsmx5

iTrader: (16)

Yeah they were free as could be before torquing the nuts. I did backup the inner race before pressing the hubs into the bearings. I'm probably gonna just drive it and hope it loosens up after a few miles. I think this could be normal, but my internet searching didn't show me a conclusive yes or no on this.

mmmjesse

i have never had tight bearings after replacing. I would look into it.

patsmx5

iTrader: (16)

What would I check? If I remove the bearings I might as well replace them, but I'd have to order new ones again. I used new hubs as well, anything I need to check on those? I dunno what to look for. Everything was clean on assembly.

patsmx5

iTrader: (16)

FWIW the drivers side, when I install a wheel I can spin it. There is resistance but I could see that being a normal amount of resistance. The passenger side is like 3x stiffer, very hard to turn.

miata2fast

iTrader: (2)

Something is wrong.

dc2696

iTrader: (2)

Only thing I would do for a quick check is loosen then retorque in a couple steps to see how tightens up. If it still feels bad/way worse than the opposite side; it's only a few bucks to replace a bearing/hub vs a failure which is not a ton of fun.

curly

iTrader: (25)

Did you toe the car with the eccentric adjustment too? Rear is really difficult to eyeball. Having different toe in the rear would be a big issue during a launch I'd think.

patsmx5

iTrader: (16)

I untorqued the nut, that didn't change the tightness at all. So pulled the upright and inspected. Actually found 2 issues. I greased the seal that touches the axle, but only the inside, not the outer part that also touches the axle. That spot was dry and obviously rubbing. I also made sure that seal was bottomed out in the upright to be absolutely certain. But the "big" problem was with the axle. The part that the axle hits the inner race, there was some light rust that was poking up a tiny bit. So probably making the inner race crooked on a tiny scale. I removed the little rust spot, and cleaned/greased it and reassembled and now it feels fine torqued to 170 I can rotate the hub by hand like the drivers side. Actually it now rotates a bit better than the other side.

Thank you folks for confirming there was a problem.

Curly, I have not adjusted the toe yet. You're right about it having a big affect, I gotta try to adjust it still. I was thinking once the car is back on the ground, use the string method and a caliper and try to measure toe that way. I did this on my Outback a couple years ago and it worked ok.

If anyone has a good or easy idea of how to DIY check the rear toe, I'm all ears!

patsmx5

iTrader: (16)

I put about 50 miles on it. Seems fine. Stiffer ride, no surprise, also a lot more agile. Gotta do the front next, will hopefully get that done in the next couple weeks. Haven't launched it hard or anything but on the road and doing a 3rd gear roll on, it feels better. Pretty sure this made an improvement. Also this last part is probably all in my head, but I swear it feels like the rolling resistance went down. I kind of doubt that, but it sure feels like it.

Going to go order new front hubs/bearings as well in a week or so and then do the front. Then all 4 corners will be new. Plan to wire up the trans brake (gotta research best practices wiring for that) and try it out on friday. It's rained 2 out of the last 3 fridays but hopefully it's dry and I can run.

patsmx5

iTrader: (16)

Been driving it. Made a couple pulls and it does seem a lot more stable now on a 1-2 shift. I think that problem is fixed. I did find the new turbo setup is heating the coils up and melted some split loom I had on some nearby wires. Plan to build a heat shield to keep the turbo heat off the coils/wires near the valve cover. Otherwise it seems to be doing well. If it runs well at this power level I'll turn it up and see what happens. Hope to get a 6 second 1/8th mile pass out of it soon!

patsmx5

iTrader: (16)

Heat shield built and installed, should work fine. Made form polished stainless like my other heat shields for the SC setup I made.

Trans brake is installed and tested, it works. There's an arming switching in the cup holder, and the button is just to the right of the shifter.

18psi

iTrader: (76)

VIDEOS PLEASE!!!

I'd love to see the car launching and going through the gears.

patsmx5

iTrader: (16)

I will see what I can do for videos!

SchmoozerJoe

iTrader: (2)

I'm local. And have many video devices.

And have calibrated my *** with Pokey out in Colorado.

sixshooter

iTrader: (12)

You calibrated your *** with Pokey?

I want to hear your impressions of the transbrake.

patsmx5

iTrader: (16)

I go to HMP 1/8th mile track every friday that it does not rain. Either in the miata if it's running, or a black C63 if the miata is broken. Miata is ready to go so I'll be there tomorrow, if it does not rain and they open the track. Forecast looks good, but it rained bad yesterday and sometimes the wet soil causes water to puddle on the track after heavy rain. They rained out 2 of the last 3 fridays...

Do you have a camera I could clamp to the roll bar? Or one I could put on a fender? Or somehow attach to the steering wheel to show the gauge cluster?