2014 on 18X8 +48MM

[ErikSOCAL]

Hi everyone, just joined. Here is the link to my post in the welcome area:

http://www.mazdas247.com/forum/show...yone-2014-MZ5-Sport-6MT&p=6372259#post6372259

Has anyone tracked their vehicle (SCCA)? Interested in hearing what steps you would take to improving the handling (I know the driver is really the first step). Was thinking wheels and tires but would suspension be better? Not sure what to expect from this 3,500lb vehicle when going through the cones. Maybe a tighter suspension is first. But.. thinking wheels and tires:
Looked through the threads and looks like +50mm offset is ideal. Seems like those wheels run about $50 more per rim but haven't taken a liking to any of them. The Andros N1 seems the ticket but is +48mm offset or +0.2" and that could be a lot.

Thoughts? Planning 225x40 tire.
Also do I need new TPS on each wheel? Looks like another $200 which would really kill this initiative.

thank you,
Erik

 

[tuanies]

Most tire shops should be able to break the bead on the stock tire to pull the TPMS sensors. That's what they did for my wheels.

 

[ErikSOCAL]

Thanks, I should have run the calculator with a stock set up but is there speedometer error when switching wheels and potentially overall diameter?

 

[hibern8r]

I purchased used sensors off ebay for under $60 for the set of 4 tested. No problems.

 

[tuanies]

It'll read a little slower, about 0.5mph at 60 so not that big of a deal.

 

[phunky.buddha]

Welcome Erik! sac02 has tracked his- he's down in San Antonio. I have cheapie BC coilovers on mine (S2k gets the ASTs) but find it handles pretty well, and I do enjoy flogging it in the twisties even though I'll probably never track it.

 

[MaMoi89]

I have 18x8.5 +43 and I rub in the back without fenders rolled. It's not too bad, only when I hit a dip or something. Plus I have coils. I have 225/40 tires too. Actually, the TPMS sensors use the ABS system in our cars. Not sure exactly how that works... Something about the rotation of the wheel idk. Usually, you can take your stock TPMS sensors and transfer them to the new wheels. I do plan on going to the track at least a few times so I'll see how it goes with these wheels.


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[ZealoustheEnder]

The tpms uses the antilock brake sensors

 

[MaMoi89]

The tpms uses the antilock brake sensors

That's what I said


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[Silentnoise713]

The tpms uses the antilock brake sensors

can you explain or cite a reference? I am courious to understand how the TPMS uses ABS, they are two different systems. Do you mean TPMS affecting ESC which in turn uses ABS where if TPMS ligh is on, system goes into safe (nanny) mode and does not allow you to disable ESC/TC which uses ABS? Simple solution is to buy a <'09

 

[loosenut]

Mazda is moving to a wheel speed signal based tpms system but as far as I know at least through 2014 all mazda 5's use wheel mounted sensors. Starting with the CX5 and all new models since then use wheel speed. The above posters are wrong for the Mazda 5. In my opinion it's not as accurate as wheel mounted sensors and can be easily confused by slightly different tire diameters. I don't like it. But it illiminates tpms sensors going bad, broken tpms sensors during tire changes or corroded tpms sensors preventing removal.

 

[Silentnoise713]

If I understand correctly, this means no need for an actual TPMS sensor in the rim and only "simulated" good/bad output based on rotation wheel speed of the ABS in new Mazdas to come? It would be nice to eliminate the $$ of the device but this sounds more like the manufacture trying to cut cost or really trying their best to meet the bare minimum legal requirement. Do you know if other MFGs are going this direction? Is this system accurate? Thanks. Learned something new today.

Also, would it still be technically correct to call it TPMS since it is not pressure based and it does not monitor?

 

[loosenut]

If I understand correctly, this means no need for an actual TPMS sensor in the rim.

Also, would it still be technically correct to call it TPMS since it is not pressure based and it does not monitor?

Correct, no actual sensor, just wheel speed comparisons between all four wheels. It is a monitoring system and still called TPMS, but it is monitoring an extrapolation based on known characteristics of properly inflated tires of the correct size and their relative wheel speed. Other manufacturers have used this style system since the dawn of mandated pressure monitoring. I just don't like the downsides of this system versus the downsides of the wheel mounted system.

 

[Silentnoise713]

just wheel speed comparisons between all four wheels. It is a monitoring system and still called TPMS,

Gotcha, that explains it. I’m guessing running staggered would throw it off. It should be called TMS. Didn't know this method was used since inception of the mandate. Always nice to read your comments/knowledge!


The more I think about it, the more sense the wheel speed approach makes. This is a cheap (and clever) approach and good enough to illuminate a light. I've always wondered why mfg limit a wheel based system to a dummy light (I thought it might be due to no front end display as cars come with basic/button based radios). For the added cost of the wheel sensors (x4!), they should make it real-time tire pressure monitoring like the premium cars. Otherwise, it is a wasted expense. Now that car's will be mandated to have back-up cameras, which means a screen/basic infotainment, why don't they instead keep the wheel based system and open it up report real-time actual tire pressure monitoring!?... Instead, they go backwards and do this.



@ OP - sorry for thread jacking. No more from me but hopefully this is useful info for others too.