Bill, your Bronco also has an EGR valve to compensate for those high
combustion temps, whereas the Jeep is just allowed to run on the ragged edge
by design. This explains why you pass, and he fails.


Jerry


"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:40B8EB70.57FC22F7@***.net...
> Well my Bronco has 33"s on a worst 3.00 ratio and it is a little
> dirtier at the slow speed, but no where near failing:
> http://----------.com/smog.jpg
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> "Bone P.A." wrote:
> >
> > NO. As explained to me, @25mph on their dyno they look at wheel speed
not
> > mph or rpm. My tires is 33", sotck is less, they reference off stock.
With
> > larger tires you have lower rev's at low rev's engine run lean puts out
more
> > pollutants. Increase the rev less pollutants. Therefore smaller tires
higher
> > rev's less pollutants. My gearing is only 4.10

 

LOL
Should have put it in lo range for them.

--James

"Bone P.A." <bp@charter.net> wrote in message
news:10bhqjb42vd2s51@corp.supernews.com...
> NO. As explained to me, @25mph on their dyno they look at wheel speed not
> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
> larger tires you have lower rev's at low rev's engine run lean puts out
more
> pollutants. Increase the rev less pollutants. Therefore smaller tires
higher
> rev's less pollutants. My gearing is only 4.10
>
>

 

LOL
Should have put it in lo range for them.

--James

"Bone P.A." <bp@charter.net> wrote in message
news:10bhqjb42vd2s51@corp.supernews.com...
> NO. As explained to me, @25mph on their dyno they look at wheel speed not
> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
> larger tires you have lower rev's at low rev's engine run lean puts out
more
> pollutants. Increase the rev less pollutants. Therefore smaller tires
higher
> rev's less pollutants. My gearing is only 4.10
>
>

 

LOL
Should have put it in lo range for them.

--James

"Bone P.A." <bp@charter.net> wrote in message
news:10bhqjb42vd2s51@corp.supernews.com...
> NO. As explained to me, @25mph on their dyno they look at wheel speed not
> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
> larger tires you have lower rev's at low rev's engine run lean puts out
more
> pollutants. Increase the rev less pollutants. Therefore smaller tires
higher
> rev's less pollutants. My gearing is only 4.10
>
>

 

LOL
Should have put it in lo range for them.

--James

"Bone P.A." <bp@charter.net> wrote in message
news:10bhqjb42vd2s51@corp.supernews.com...
> NO. As explained to me, @25mph on their dyno they look at wheel speed not
> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
> larger tires you have lower rev's at low rev's engine run lean puts out
more
> pollutants. Increase the rev less pollutants. Therefore smaller tires
higher
> rev's less pollutants. My gearing is only 4.10
>
>

 

In message <40B8EDFF.935DA419@sympatico.ca>, "Mike Romain" wrote:

>Here in Canada, they go by rpm and use rollers, not a loaded dyno. A
>dyno is for testing HP, the emissions maching is just rollers.

If they're testing for NOx, it has to be loaded.

>
>I figure the larger tire is creating more load than your engine can take
>and stay clean. That implies a tired engine to me.
>
>On the last smog I passed with my 33" muds on and I have 3.31 gears. I
>got 15 ppm HC and 0.16 CO.
>
>Mike
>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>88 Cherokee 235 BFG AT's
>
>"Bone P.A." wrote:
>>
>> NO. As explained to me, @25mph on their dyno they look at wheel speed not
>> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
>> larger tires you have lower rev's at low rev's engine run lean puts out more
>> pollutants. Increase the rev less pollutants. Therefore smaller tires higher
>> rev's less pollutants. My gearing is only 4.10

 

In message <40B8EDFF.935DA419@sympatico.ca>, "Mike Romain" wrote:

>Here in Canada, they go by rpm and use rollers, not a loaded dyno. A
>dyno is for testing HP, the emissions maching is just rollers.

If they're testing for NOx, it has to be loaded.

>
>I figure the larger tire is creating more load than your engine can take
>and stay clean. That implies a tired engine to me.
>
>On the last smog I passed with my 33" muds on and I have 3.31 gears. I
>got 15 ppm HC and 0.16 CO.
>
>Mike
>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>88 Cherokee 235 BFG AT's
>
>"Bone P.A." wrote:
>>
>> NO. As explained to me, @25mph on their dyno they look at wheel speed not
>> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
>> larger tires you have lower rev's at low rev's engine run lean puts out more
>> pollutants. Increase the rev less pollutants. Therefore smaller tires higher
>> rev's less pollutants. My gearing is only 4.10

 

In message <40B8EDFF.935DA419@sympatico.ca>, "Mike Romain" wrote:

>Here in Canada, they go by rpm and use rollers, not a loaded dyno. A
>dyno is for testing HP, the emissions maching is just rollers.

If they're testing for NOx, it has to be loaded.

>
>I figure the larger tire is creating more load than your engine can take
>and stay clean. That implies a tired engine to me.
>
>On the last smog I passed with my 33" muds on and I have 3.31 gears. I
>got 15 ppm HC and 0.16 CO.
>
>Mike
>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>88 Cherokee 235 BFG AT's
>
>"Bone P.A." wrote:
>>
>> NO. As explained to me, @25mph on their dyno they look at wheel speed not
>> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
>> larger tires you have lower rev's at low rev's engine run lean puts out more
>> pollutants. Increase the rev less pollutants. Therefore smaller tires higher
>> rev's less pollutants. My gearing is only 4.10

 

In message <40B8EDFF.935DA419@sympatico.ca>, "Mike Romain" wrote:

>Here in Canada, they go by rpm and use rollers, not a loaded dyno. A
>dyno is for testing HP, the emissions maching is just rollers.

If they're testing for NOx, it has to be loaded.

>
>I figure the larger tire is creating more load than your engine can take
>and stay clean. That implies a tired engine to me.
>
>On the last smog I passed with my 33" muds on and I have 3.31 gears. I
>got 15 ppm HC and 0.16 CO.
>
>Mike
>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>88 Cherokee 235 BFG AT's
>
>"Bone P.A." wrote:
>>
>> NO. As explained to me, @25mph on their dyno they look at wheel speed not
>> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
>> larger tires you have lower rev's at low rev's engine run lean puts out more
>> pollutants. Increase the rev less pollutants. Therefore smaller tires higher
>> rev's less pollutants. My gearing is only 4.10

 

Bone P.A. wrote:

> NO. As explained to me, @25mph on their dyno they look at wheel speed not
> mph or rpm. My tires is 33", sotck is less, they reference off stock. With
> larger tires you have lower rev's at low rev's engine run lean puts out more
> pollutants. Increase the rev less pollutants. Therefore smaller tires higher
> rev's less pollutants. My gearing is only 4.10

Alas, stock is not 4.10 either! So with the 33's and the 4.10 you are running
right about the right engine RPM for 31.4's, which is only 90% of 30's. If they
let you put stock tires on, while keeping the non-stock 4.10, it seems like
you've found a way to pass these tests even for engines that should fail it!

alan