RTI rating

[spanky]

just tryed the rti calculater on 4lo.com out of intrest, the scudo would have a rti of 837, any one else tryed yet?.
vaughan

[Cloggy_NZ]

Using that calculator my Discovery with 32" tyres and 100" wheel base would supposedly score 936 on the ramp. A little optimistic I think. Disco's and Range Rovers have excellent articulation "out of the box" but even I wouldn't claim they had that much (although it would be nice )
Early Range Rovers (and Disco's) without sway bars ramped around 670 - 700, diminishing to around 580 - 590 for the later models with sway bars fitted.

[TJ]

I have not tried the 4lo.com calculator, but I do remember measuring on Russell's ramp at 4wd Extreme Park a long time ago. With an OME suspension and front sway bar disconnected, I got an actual RTI of 1080. Jeeps with front beam axles articulate a lot

[meece4x4]

well according to that my Fez scored

Ramp Travel Index (RTI) enter both in blue and press CALC
Simulates a 20 degree ramp
Inches tire above ground: 29.5 Wheelbase inches: 85.6

RTI Score: 1008 Inches up 20º ramp: '' 86.3

bit optimistic I think considering I can go 86.3 inches up the ramp .....but Im only 85.6 inches long

[doddzee]

Are you guys confusing tire distance above the ground with the height of you tire

Think the tire above ground measurement is how far off the ground the bottom of your tyre is off the ground once you have driven up the 20 degree ramp.

[TJ]

Are you guys confusing tire distance above the ground with the height of you tire

Think the tire above ground measurement is how far off the ground the bottom of your tyre is off the ground once you have driven up the 20 degree ramp.

Nope, I am not confusing it because I didn't use that calculator. Mine was actual measurement on a proper ramp by someone competent enough to calculate using a calculator! But I do agree, the measurement is of how far up have you gone on the ramp without lifting any wheels off the ground (not the tyre size).

[meece4x4]

Are you guys confusing tire distance above the ground with the height of you tire

Think the tire above ground measurement is how far off the ground the bottom of your tyre is off the ground once you have driven up the 20 degree ramp.

ok that makes more sense ... I think, buggered if i know .. maths confuses me at the best of times

[H2OLOVA]

This calculator estimates the Ramp Travel Index (RTI) without having access to a "real" ramp.

Since this is based on math we can use a formula to estimate your RTI. The trick is to get one tire off the ground while the other three remain touching the ground. Then measure from the bottom of the lifted tire to ground. I've seen forklifts being used, climbing up a steep rock face, even climbing stairs. I suppose you could climb different things and use the calculator to find the RTIs. Then take the average of all. In any event, if you're curious I've provided a calculator that will get you an idea of your RTI. Anything above a 500 is great, there are a few rigs out there that can do perfect 1000's or better. How will you do?


Formula used
RTI = Tire Height/sin(20*PI/180)/Wheelbase*1000
Inches Traveled = Tire Height/sin(20*PI/180)

[KiwiBacon]

I have not tried the 4lo.com calculator, but I do remember measuring on Russell's ramp at 4wd Extreme Park a long time ago. With an OME suspension and front sway bar disconnected, I got an actual RTI of 1080. Jeeps with front beam axles articulate a lot

I don't see how a score higher than 1000 is possible.
At 1000 both of your wheels are on the ramp, at which point you've beaten the 20 deg ramp and need a steeper one.
Otherwise you'll simply keep driving up until your vehcile falls over.

What mods have you done to get that sort of score?

[TJ]

I have not tried the 4lo.com calculator, but I do remember measuring on Russell's ramp at 4wd Extreme Park a long time ago. With an OME suspension and front sway bar disconnected, I got an actual RTI of 1080. Jeeps with front beam axles articulate a lot

I don't see how a score higher than 1000 is possible.
At 1000 both of your wheels are on the ramp, at which point you've beaten the 20 deg ramp and need a steeper one.
Otherwise you'll simply keep driving up until your vehcile falls over.

What mods have you done to get that sort of score?

Well technically anything is possible.


However, that is not my ride. I do have a photo of the ramp in this thread where I stopped half way to take a photo. I did manage to travel a more up the ramp on that one. It looks more like a 30 degree ramp, but I'll have to check that one. Also, the RTI was calculated using the method explained in this article.

I had only changed the suspension to OME and had disconnected the front sway bar at the time.

[spanky]

i thought it was a bit generous on the score as well ,i might build a ramp,even so mine now flexes quite good for ifs and suspension that would cost less than a $100 if i bought it. vaughan

[toysuzi]

the RRO coil kit is meant to have 40" of flex but as i am running lower 6" kit not the 8"
i have got about 34" under the tire also it has stretched the wheel base out 3 more inches with the kit
so all up gives me a RTI Score of around 1200
the pic is also only in fwd no rear drive shaft

[swampa]

sweet ride!!!

[H2OLOVA]

Shit yeah got some nice flex going on there

[Bubba]

After QBW in Rallywoods I have figured out how to do my Ramp Index, well I think I do anyway

My 70 Cruiser was pathetic but I worked out it has a RTI of 0.757. Is that sound right or do i need more beer, things are getting qa bit blurry at the moment

[Bubba]

After QBW in Rallywoods I have figured out how to do my Ramp Index, well I think I do anyway

My 70 Cruiser was pathetic but I worked out it has a RTI of 0.757. Is that sound right or do i need more beer, things are getting qa bit blurry at the moment

oh and thqanks to Rex bastard I can now do other peoples as well if you send me your wheel base

[KiwiBacon]

Early Range Rovers (and Disco's) without sway bars ramped around 670 - 700, diminishing to around 580 - 590 for the later models with sway bars fitted.

Didn't the later rangies with air suspension get back to the original numbers? There's a 92 range rover here quoted at 670.
http://www.offroaders.com/info/tech-corner/rti.htm

[Bubba]

Hang on, I think my calulations are beer afrected

Tu, what is the angle of the ramp we used??

[turoa]

Hang on, I think my calulations are beer afrected

Tu, what is the angle of the ramp we used??

we used a 20deg ramp.

Kiwibacon, scores of over 1000 are very easily done. you just get the ass end to drive up teh side of the ramp