Emissions rollers

[madmike283]

I know this has been discussed before, sorry. I sold the XJ last week and I forgot about the 33" rule. The buyer was nice enough, and not worried about me having it tested first. Now he's in a little bind needing to have it tested.

Does anyone have a set of 32s/33s that he could borrow for an afternoon? I know High Country is doing them, but they're now charging $100. I figured I'd ask here and see if someone has some that they wouldn't mind letting my buyer use. I believe he's in Lakewood/Englewood area.

Thanks,
Mike

 

[Hypoid]

I have some 31s, not ideal, but available.

 

[YELLAHEEP]

Yep. Got a set of 33's he's welcome to use.

 

[scottmcneal]

Sorry to jump in here, BUT what do they do for the ones that come with taller tires on them? We have jeeps out here that come with 35 on them.Yes they're JK's but they still have them

 

[SolarBell]

Sorry to jump in here, BUT what do they do for the ones that come with taller tires on them? We have jeeps out here that come with 35 on them.Yes they're JK's but they still have them

They allow all tires that were bigger than 35 from the factory, they will his go on a different machine. But it has to be documented to have come that way and if they are still bigger than factory they can reject (e.g. 37's on a rig that came with 35's). Since XJ's came with essentially 27's then the 33" rule applies.

 

[5-90]

They allow all tires that were bigger than 35 from the factory, they will his go on a different machine. But it has to be documented to have come that way and if they are still bigger than factory they can reject (e.g. 37's on a rig that came with 35's). Since XJ's came with essentially 27's then the 33" rule applies.

Why is this an issue, anyhow? Am I missing something?

 

[SolarBell]

Why is this an issue, anyhow? Am I missing something?

Air Care Colorado will reject vehicles from testing if their tires are larger than 33" as they don't fit right on the dyno rollers, with the exception as stated.

 

[5-90]

Air Care Colorado will reject vehicles from testing if their tires are larger than 33" as they don't fit right on the dyno rollers, with the exception as stated.

Figures.

Which is why I plan on telling them I've refit my 88 to AWD when I bring it back up (whether I actually do or not...) since that should still get me the TSI test instead of dealing with some halfwit stalling my clutch on the dyno again...

I don't have a problem with smog control in theory - my wife is an asthmatic, so I can understand. And, emissions monitoring is a useful tuning tool.

My argument with the idea is when it is put into practise - it's an asinine and onerous system, and they wonder why people keep trying to find workarounds...

 

[YELLAHEEP]

Air Care Colorado will reject vehicles from testing if their tires are larger than 33" as they don't fit right on the dyno rollers, with the exception as stated.

Yeah, it has to do with the rollers on the sides of the dyno that keep the car tires from wandering off the dyno rollers (sideways). Those side rollers make contact with the sidewall of the tires if it wanders too far off to one side or the other.

While most tires have smooth enough sidewalls, it's the off-road tires that have side wall tread and/or lugs that could grab and hop over these side rollers.

Additionally, the larger the overall diameter the tire is, the less it sits down in the channel between the two parallel dyno rollers so the other concern is that the large tires will allow the car to pull up and out of the channel at speed.

Makes me wonder if the hoopties and donks running 22"-24" and larger wheels with low profile tires also get denied..........

All said, it does make good safety sense. I wouldn't want to be anywhere near a big truck with Super Swamper Thornbirds or Pit Bulls as it runs up to 60 mph...... It'd be nice though if the dyno equipment had adjustable parallel rollers to accomodate the larger tire diameters and at least allow A/T type tires run.