CoffeeBoss wrote:With regards to the lack of rubbing compared with before, you should consider all the changes that have occurred - ride height, guard roll, but most importantly the change in rolling diameter.
Remembering tire profile is a ratio of the width, so the actual tire height varies for the same profile with different widths (and as the tire wears as well of course).
So this may also have something to do with it.
But Wow... the tire improvement alone has made this all worthwhile!
Seriously looks good, looking forward to seeing this in the metal.
Eventually.
At some point.
That makes sense
....
Well, it's not all been smooth sailing since I put the wheels on. After having the CAS o-ring changed at MX5 Mania I started to have an intermittent missfire/stuttering/bucking problem. CAS o-ring replacement shouldn't be related, right? It was. But it wasn't Mania's fault, read on to find out why.
When cruising, the car would just stop firing, tacho would drop, then suddenly burst back into life.
Because it was intermittent (could go for weeks without a problem), I didn't feel like wasting my money at mechanic's having them to try to diagnose it. So instead, I turned to google, and a search of this forum and a few others.
I narrowed down the problem to being electrical, and possibly a sensor. It was one of these: coilpacks, plug leads, plugs thermosensor at the back of the engine, CAS, MAF, piggy back computers, vacuum leak, fuel pump+fuel filter. One, all, or any combination.
Quite a few of them mean big money, so I thought I'd start with other stuff.
Plugs, and leads were new.
Coilpacks...20 years old. Might as well get a new set, can't hurt. Money though...
Thermosensor....fixed Taz's problem on here. Might give that a go too.
So, anyway, a few clicks on mx5parts.co.uk and I had a box at my door.
I also bought some other items. Some bling, and fiddly replacement rubbers for the roof and hardtop.
...and away I went.
First, something pretty.
Then something annoying.
There's a bolt at the back of this, at the bottom, that is insanely hard to get to. I've got big'ish hands and there was no way in hell that I could get to it with the tools I had. Ended up getting a 12mm ratchet angled head wrench. That got it.
Thankfully, the new coilpack I have is an aftermarket one, with a modified bracket. The bottom of this bracket is open and "clips" onto the bottom bolt. So there's no need to undo it again, ever.
The thermosensor is on it's way from the UK still. $68 delivered as opposed to $167 from Mazda here in Australia. So I'll do that later.
In the meantime though, the missfire came back with a vengeance. Was very noticeable this time, and the car was running insanely rich.
"It has to have something to do with when Mania had the CAS out", I thought. Plus the previous owner recently mentioned to me to check the wiring.
So I looked at the CAS wiring. It was tight, very tight, and there was bunch of electrical tape over a lumpy area. So, what does one do when they see bumpy bits covered by something? GRAB THEM ofcourse
Felt like plastic, so immediately I thought, they've been crimped and come loose.
So, engine on, go out and grab... engine nearly stalls and starts to run badly. Move around, smooths out....Definitely a wiring problem. This is what I found after I snipped all the electrical tape away:
GAH!@!
HATE THESE THINGS. Really hate these plastic splice things, always have, always will.
Needless to say the spliced wires had fallen out of their seats, probably during the CAS o-ring replacement. *facepalm*
The wires head to the piggy-back timing computer, so I'm guessing timing was being thrown all over the place. Explains the coughing, stuttering, rich running, and occasional power dip.
I've since soldered the wires up properly and insulated them, and gone for a drive. Night and day difference. The engine actually sounds smoother, and it's not idling rich anymore. Yet to go for a long drive to test it properly though.
The thermosensor is still on it's way. Hopefully I don't need it. When it gets here I'll probably just replace it for the sake of it.