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The Miata's Back - Equiraptor's Journal
The Miata's Back
I absolutely love my car.

I went and picked it up from the shop today. They said they didn't get a chance to give it a good shake down, so I should expect to have to stop by for a few things in the next few weeks. Some minor adjustments.

I have to turn the key to the "On" position and leave it there for a few seconds before I turn it to "Start." It has the ACT clutch, so the clutch engages/disengages at the bottom of its range (it was like that pre-supercharger, but that's a difference from stock). It seems to be a bit stiffer to shift than before, but that may just be me being used to the Camry. It doesn't seem to like running at low rpm - running at 20mph in 3rd (something it did fine before) causes a bit of jerkiness.

But, mostly, it feels like a stock Miata. It pulls away from a stop easily and smoothly. It corners like normal. It sounds like normal. Until my foot pushes on that pedal, when the squeal comes and the car GOES. And oh, does it go. There's a stop sign on my way home that's rarely very busy, and there's a stretch of fairly empty road with clear shoulders - A good chance to go without worrying about something jumping out in front of me. So I went. Gently from the stop (no sense burning tires) but I started to push going into second gear. The car did that trying-to-lose-traction thing I've felt Nugget's car do when he was really pushing it.

Nugget and I planned to go for a drive that started with a few pictures, but before we got very far, a bolt dropped out of the car. The car continued to drive like normal as I pulled it over, and it continued to idle as smoothly as ever, but I'd rather only drive it minimally until John makes sure that was a dropped bolt, not a needed bolt, that came off.

On my drive home, "Days Go By" came on the radio.

Current Mood: jubilant jubilant

18 comments | Leave a comment
chrisj04 From: chrisj04 Date: July 8th, 2005 09:09 pm (UTC) (Link)
quelrod From: quelrod Date: July 8th, 2005 11:13 pm (UTC) (Link)
hrm my car is quite unhappy going 20mph in 3rd. 20mph is clearly 2nd territory. 25mph in 3rd is ok but very little power unless i was in the middle of accel and timed the 2nd->3rd just right.
equiraptor From: equiraptor Date: July 9th, 2005 06:47 am (UTC) (Link)
The Miata has extremely short gearing. The Camry wouldn't be happy going 20 in 3rd... Like your car, 25 is about the bottom. The ///M Roadster is pretty much the opposite of the Miata - very long gears. Twenty-anything in third is pretty much ruled out, but fourth will take it a good deal over 100. Fifth could take it as high as 180 (if the limiter was taken out).

For the Miata, first is good until around 30-something, second is okay for starting and will take you to 50-something, with some care 3rd can get you going from a stop but prefers to be used for 20-70, 4th comes in at around 35 and runs to *shrug* more than freeway speed, and 5th can manage 40, and will top out (based on calculations) around 144, bouncing of the rev limiter. I suspect the minimums of the gears have been increased a bit, due to the extra power draw of the belt for the SC.
busychild424 From: busychild424 Date: July 9th, 2005 03:02 pm (UTC) (Link)
you fuckin SUCK DUDE.


hey, loan me $9000. I'll pay it back. promise.


Enjoy it, and I'm excited to see the dyno results.
(Deleted comment)
equiraptor From: equiraptor Date: July 9th, 2005 11:11 pm (UTC) (Link)
John told me he thinks he might hate my car now. :/

It dropped a bolt on me... As in, I was driving down the road and a bolt fell off. The car still ran fine, so I drove it by the shop and showed John the bolt. Apparently, that particular bolt is not used in Mazdas, at all. AT ALL. How the hell did it get in my car to fall out? (the road was clear when I drove over it, I heard a sound, and saw the bolt bouncing in the rear view mirror) Oh, the puzzlement.
paradox0220 From: paradox0220 Date: July 10th, 2005 08:03 am (UTC) (Link)
I love how your car looks like a smiley face in that picture.
equiraptor From: equiraptor Date: July 10th, 2005 10:34 am (UTC) (Link)
I love it too. That's exactly why I made (and use) that icon. :D
From: (Anonymous) Date: July 10th, 2005 04:26 pm (UTC) (Link)
Don't worry, Monica, I still love you car even if John doesn't ;) The reason you car lurches at low RPM in 3rd is because I need to adjust you fuel maps in those zones. During coarse and fine tuning the car needs to stay in those zones for a certain amount of time to let the Link add or subtract X amount of fuel until it is feeding the proper amount of fuel required by your O2 sensors for those zones. It's difficult to tune the lower zones, well, because the car lurches :) That means I have to manually go in there and increase the fuel, which I can easily do, I just haven't had the time yet. I'll need to look at your datalogs again to figure out which zones need more fuel and that's all i'll need.

keep in mind that the bolt may certainly not be a Mazda bolt, but you have many non-Mazda parts on the car now :) I'd like to take a look at it, too, to see if I recognize it.

decibel45 From: decibel45 Date: July 11th, 2005 09:59 am (UTC) (Link)
Why the need to turn the key on before starting?
equiraptor From: equiraptor Date: July 11th, 2005 10:01 am (UTC) (Link)
I don't know, exactly. I never bothered to ask.
From: (Anonymous) Date: July 11th, 2005 11:50 am (UTC) (Link)
The reason it has to be turned to ON for 3-seconds before starting is so that the ECU can boot and adjust to ambient temperatures and the MAP can set for the proper elevation. fuel and ignition at sea level are different than those set at higher elevations.

decibel45 From: decibel45 Date: July 11th, 2005 12:08 pm (UTC) (Link)
Yeah, I figured it was just a matter of the ECU manufacturer being cheap/lazy. Though adjusting to altitude/elevation with the engine starting would probbaly be very difficult to do without using an external sensor.
cowbert From: cowbert Date: July 12th, 2005 11:10 pm (UTC) (Link)
but shouldn't the ECU "learn" the setting after doing it once? Texas is pretty flat, you know...
From: (Anonymous) Date: July 13th, 2005 06:39 am (UTC) (Link)
ambient temperature isn't a constant, though
decibel45 From: decibel45 Date: July 13th, 2005 10:14 am (UTC) (Link)
Texas may be flat, but barometric pressure does change. I believe the way OEM ECU's handle this is they know how much pressure drop there will be at a given idle RPM, but that only works if you know what kind of filter is in there as well as what the intake runner is like.
cowbert From: cowbert Date: July 12th, 2005 11:12 pm (UTC) (Link)
I wish my clutch disengaged closer to the floor. I think mine is pretty worn, which is why it's disengaging so close to the top. On the street, I can use the rug as a ghetto clutch stop, but I have yet to find a solution for autox (no rugs).
equiraptor From: equiraptor Date: July 13th, 2005 06:59 am (UTC) (Link)
It's interesting how different clutches behave when they wear. In... some old car, probably a Toyota (the car my mother was driving while she was pregnant), when the clutch was worn, it disengaged closer to the bottom of its range.

Now, here's the kicker. My mother was 9 months pregnant. The clutch on her car was wearing, forcing her to push pretty hard on the clutch pedal. She went to one of her checkups for her pregnancy and was told she's in labor and needs to go to the hospital. My mother drove herself, in a car with a failing clutch, while in labor.
decibel45 From: decibel45 Date: July 13th, 2005 10:26 am (UTC) (Link)
*refrains from comment*

18 comments | Leave a comment