Stock 4x4 comparison

[Wisha Haddan H3]

I've been working on a way to predict the off-road performance of a vehicle based on its specs, like approach angles, torque, gearing, weight, dimensions, etc.

Without getting into all the details, I came up with this ranking for extreme off-road performance. The models are either the current model or their last model year. They all have 4-lo except the Murano (which a friend was curious about).

I know you lose a lot when you don't take suspension and parts quality into account, but is the ranking basically in the ballpark?

[Wisha Haddan H3]

I know ... I have waaaaaay too much time on my hands

[PARAGON]

bwahaahahahahahhahah

that has to be the most hilarious thing I've seen on here in a while

[PARAGON]

Originally Posted by Wisha Haddan H3

I know ... I have waaaaaay too much time on my hands

no, I think the problem is that you have way too much dumb in your head

[31_bandits]

for curiosities sake, what was the rating system?

[PARAGON]

Originally Posted by 31_bandits

for curiosities sake, what was the rating system?

apparently, chicken feathers

[DennisAJC]

Originally Posted by Wisha Haddan H3

I've been working on a way to predict the off-road performance of a vehicle based on its specs, like approach angles, torque, gearing, weight, dimensions, etc.

LMAO!!!!

This thread reminds me of that time Alec's AE did a poll for "Best Elcova Offroader" Alec won that poll.

Thanks to the ***Cough***AE***Cough****Votes***Cough***.

[31_bandits]

well, i hope you had fun with the project.

one thing you really have to do if attempting something like that is go measure some actual clearance. clearance spec's and clearance realities don't necessarily go hand-in-hand.

The Touareg is a prime-time example of that, as are toyotas. On the other side of the spectrum, the H3 has (on one i measured in the dealers lot just for kicks a couple months ago) nothing as close to the ground as 9.1", more like 9.5.

[Wisha Haddan H3]

Thanks for your feedback. Yeah, it's been fun and I've learned a lot.

For the record, this isn't about which SUV is the best. I'm trying to write a software application that will evaluate vehicle performance offroad, based on your own measured specs. The factory specs on HP, torque, wheel size, and such were just a place to start.

The software would display the benefits (or problems) of new gearing, extra weight or bigger tires and compare it to your original vehicle before you actually cut, weld or spend a dime. You can evaluate mods you've already made and compare them to stock specs. Or you can build completely custom rigs "virtually" and evaluate the specs before you pull the trigger.

I'll post some of my evaluation criteria at lunch.

[HummBebe]

What is the H3 Advent 3700 and H3 Advent 3500???

[Wisha Haddan H3]

Originally Posted by HummBebe

What is the H3 Advent 3700 and H3 Advent 3500???

oh yeah, it's the H3 Adventure package with 3.5L or 3.7L engine.

[HummBebe]

That's what I thought, Thanks

[Wisha Haddan H3]

I'm tracking 3 kinds of data - Power, Agility and Utility.

'Power' contains max HP@rpm, max torque@rpm, curb weight, GVWR, 1st gear ratio, xfer case ratio, axle ratio, and tire diameter as the raw data.

To account for weight and gearing in each SUV, I calculated geared crawl rates (ft/s or s/ft) and worked out the formulas to compare their ability to climb different grades in 1st gear-low, based on the vehicle's weight and a standard weight for crew and cargo.

'Agility' includes ground clearance, approach/breakover/departure angles, turn diameter (curb to curb), size, wheelbase and track width. I also included full-time AWD, locking diff(s), traction control, stability control, hill start assist, and descent control.

'Utility' lists fuel economy, fuel capacity, payload, cargo volume, and tow capacity. It can also calculate towing acceleration based on a given tow weight (plus curb weight + ?? lbs crew and cargo) to compare vehicle acceleration on a boat ramp and from a stop.

[Wisha Haddan H3]

Then I created 5 profiles - Rock Crawling, Offroad Trips, Highway Trips, People Mover and Towing - that contain the data points that seem to apply. These profiles (I'm hoping) will show the suitability of the specific vehicles to an intended purpose.

The best scoring method I found was to take a % of the highest data value. For example, the highest ground clearance on my list is 16" (2006 H1 Alpha). The lowest value is 6.7" (2003 Ford Explorer Sport). I divide each data value by the highest in the list and get 1.00 for the H1 and .42 for the Explorer.

For a final score in each profile, I add up the % scores for each data category and divide by the highest value (H1 - 18.1 points). For example, in Rock Crawling, the H3 3.7L (manual) scored 18.17 points and the H3 3.5L (manual) got 17.88. Dividing by the highest value (H1 - 18.1 points), this means a final score of H3 3.7 - .95 and H3 3.5 - .92.
__________

Anyway I wanted to validate my data points and calculations before I start building the software. I've learned a lot from this forum and I appreciate your expertise and feedback.

ok

[PARAGON]

is any specific category weighted over the other. Does categories cross, as in, does a category, such as traction control cross on another vehicle when it is called or labeled something else, etc. etc on an on until your little spreadsheet looks like a 2 year old's dirty diaper.

Do you say "look ma! no brain" when you try something like this?

Wow, analysis paralysis for determining the best 4x4.

S.

[PARAGON]

Originally Posted by Steve - SanJose

Wow, analysis paralysis for determining the best 4x4.

S.

now I have psoriasis