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Search: Posts Made By: CapriRacer
Forum: EcoModding Central 01-11-2024, 08:27 AM
Replies: 12
Views: 556
Posted By CapriRacer
There's 2 schools of thought: 1) To...

There's 2 schools of thought:

1) To maximize the grip in snow, you want the largest footprint possible - and that means low pressures.

2) You want to penetrate through the snow to get down to...
Forum: Aerodynamics 11-07-2023, 08:17 AM
Replies: 111
Views: 5,861
Posted By CapriRacer
The problem here is that tire size doesn't have...

The problem here is that tire size doesn't have as much effect as the tread rubber does.

Put another way, the variation between tires of the same size is way, way bigger than the difference...
Forum: EcoModding Central 10-15-2023, 02:37 PM
Replies: 10
Views: 717
Posted By CapriRacer
Jeff, Here's a link to an earlier discussion...

Jeff,

Here's a link to an earlier discussion I started concerning RR regulations.

Ecomodder.com:
Tire Fuel Efficiency Consumer Information thread...
Forum: Aerodynamics 10-13-2023, 02:49 PM
Replies: 111
Views: 5,861
Posted By CapriRacer
Doesn't twisting the tire - tread vs rim -...

Doesn't twisting the tire - tread vs rim - effectively shorten the sidewall height? And isn't that why the sidewall buckles?
Forum: Aerodynamics 10-08-2023, 07:10 AM
Replies: 111
Views: 5,861
Posted By CapriRacer
http://barrystiretech.com/rrvsspeed.png ...

http://barrystiretech.com/rrvsspeed.png

http://barrystiretech.com/truckrrvsspeed.gif

The explanation for the increase in RR vs speed is that a rolling tire generates a standing wave in the tire...
Forum: Aerodynamics 10-06-2023, 07:50 AM
Replies: 111
Views: 5,861
Posted By CapriRacer
To completer this picture we need to know what...

To completer this picture we need to know
what affect inflation pressure has on both traction and wear.

Further, that graph is for a particular tire under a certain load. When tires are...
Forum: EcoModding Central 05-19-2023, 09:00 AM
Replies: 12
Views: 846
Posted By CapriRacer
That graph is lifted directly from this paper: ...

That graph is lifted directly from this paper:

https://azb4fstg-cdn-endpoint.azureedge.net/mediacontainer/medialibraries/smithersb4f/resources/2023/smithers_effect_of_temp_01102023v2.pdf?ext=.pdf...
Forum: EcoModding Central 05-17-2023, 04:13 PM
Replies: 12
Views: 846
Posted By CapriRacer
No. Here's the data: ...

No. Here's the data:

http://barrystiretech.com/RRvsTemp.jpg

http://barrystiretech.com/RRvsTemp.jpg
Forum: EcoModding Central 05-17-2023, 01:08 PM
Replies: 12
Views: 846
Posted By CapriRacer
Tire Rolling Resistance Increases as the temperature drops!

From Tire Business May 8, 2023

How does temperature affect rolling resistance?

By Erin Pustay Beaven

GREENVILLE, S.C.

Range can be a very tricky thing. Electric vehicle range is, simply,...
Forum: EcoModding Central 03-04-2023, 07:12 AM
Replies: 9
Views: 723
Posted By CapriRacer
Stay away from LT tires (LT tires come in Load...

Stay away from LT tires (LT tires come in Load Ranges = Ply Ratings). That's the wrong way to go for rolling resistance. LT tires are designed more for load carrying capacity than fuel economy. ...
Forum: EcoModding Central 02-03-2023, 08:24 AM
Replies: 37
Views: 4,355
Posted By CapriRacer
Update: On Feb 14, 2023, the California Energy...

Update: On Feb 14, 2023, the California Energy Commission will present its proposal on tire rolling resistance:
...
Forum: General Efficiency Discussion 12-07-2022, 09:07 AM
Replies: 1
Views: 524
Posted By CapriRacer
Tire truing is shaving off the high points of the...

Tire truing is shaving off the high points of the tire runout so the tire is dimensionally round. That used to be a common fix for tire vibrations that weren't fixed by balance. There's a reason...
Forum: General Efficiency Discussion 10-01-2022, 08:15 AM
Replies: 15
Views: 1,291
Posted By CapriRacer
They do that so that the footprint of the front...

They do that so that the footprint of the front tires is small and can fit in a furrow. The alternative is to space out the front axle so each is in its own furrow.
Forum: General Efficiency Discussion 09-30-2022, 10:06 AM
Replies: 15
Views: 1,291
Posted By CapriRacer
Toe in is stable, toe out is unstable (the...

Toe in is stable, toe out is unstable (the vehicle can't figure out which side to follow).

On solid rear axles, toe isn't a problem because it is very close to zero.

Camber tends to cause good...
Forum: EcoModding Central 09-12-2022, 04:35 AM
Replies: 8
Views: 1,284
Posted By CapriRacer
Tire Rack changed the way they designation LRR...

Tire Rack changed the way they designation LRR tires. They use "Eco Focus", which implies a bit more than just better RR. The words after "Eco Focus" is the name the tire manufacturer uses to...
Forum: General Efficiency Discussion 08-25-2022, 08:03 AM
Replies: 6
Views: 1,677
Posted By CapriRacer
Spam, spam, spam, spam.

Spam, spam, spam, spam.
Forum: The Lounge 08-16-2022, 07:40 AM
Replies: 15
Views: 1,033
Posted By CapriRacer
Ah ...... Mmmmm ...... Not exactly. I think...

Ah ...... Mmmmm ...... Not exactly.

I think you are confusing ST tires compared to regular car tires. ST tires carry more load because of the higher inflation pressures. But ST tires come in...
Forum: EcoModding Central 07-22-2022, 07:54 AM
Replies: 20
Views: 1,658
Posted By CapriRacer
You can verify that they are the factory tire by...

You can verify that they are the factory tire by looking for the TPC code required by GM on all tires supplied to them.

If they are OE, then the only valid review is going to be from folks who got...
Forum: EcoModding Central 02-15-2022, 07:39 AM
Replies: 37
Views: 4,355
Posted By CapriRacer
Update: There is a January 2022 report on...

Update: There is a January 2022 report on rulemaking out of the US Federal government - US DOT. This is the first update since Aug 2019.

The report says that there will be a rule published Sep...
Forum: Hypermiling / EcoDriver's Ed 05-15-2021, 08:05 AM
Replies: 276
Views: 83,831
Posted By CapriRacer
No, it doesn't make sense to replace one tire -...

No, it doesn't make sense to replace one tire - especially if you've had no problems since it was patched.
Forum: EcoModding Central 03-31-2021, 06:49 AM
Replies: 22
Views: 2,557
Posted By CapriRacer
Snow traction is mostly about tread pattern -...

Snow traction is mostly about tread pattern - especially edges. It's always been possible to make a tire with good snow traction that could be used year round, but those types of patterns sacrifice...
Forum: EcoModding Central 02-25-2021, 08:09 AM
Replies: 7
Views: 814
Posted By CapriRacer
The difference between tires in different sizes -...

The difference between tires in different sizes - all other things being equal - is small compared to the differences between make and models (up to 60%)

So you should concentrate on the make and...
Forum: EcoModding Central 02-23-2021, 08:08 AM
Replies: 9
Views: 1,077
Posted By CapriRacer
I am going to make the assumption that Alexshock...

I am going to make the assumption that Alexshock (OP) hasn't read the 2 web pages I pointed out - and that's why he hasn't posted back. But I am going to continue the conversation anyway.

First,...
Forum: EcoModding Central 02-22-2021, 08:01 AM
Replies: 9
Views: 1,077
Posted By CapriRacer
Read my webpage on the subject of fuel economy...

Read my webpage on the subject of fuel economy and tires: Barry's Tire Tech (http://barrystiretech.com/rrandfe.html)

and: Barry's Tire Tech (http://barrystiretech.com/rrandfe2.html)

Then post...
Forum: General Efficiency Discussion 02-11-2021, 08:21 AM
Replies: 9
Views: 1,137
Posted By CapriRacer
Don't you just hate it when someone says the same...

Don't you just hate it when someone says the same thing you were going to say? Especially when they use your own quotes!
Showing results 1 to 25 of 237

 
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