probleme viraj

[Vizitator marmotavesela]

salut! de curind mi-am luat si eu un Jimny sal bag prin noroaie, e din 2007 (deci cuplajul la buton)

ideea e ca la viraj maxim( stg sau dr) cuplat 4x4, rotile ( cele fata probabil) se infrineaza, merg foarte greu

 

aveti idee despre ce poate fi vorba?

 

astept ceva detalii daca se poate, mersi:hl

[roly]

Re: probleme viraj

 

merg foarte greu pe uscat nu? :hm sau fac asa si in noroi!?

[Vizitator marmotavesela]

Re: probleme viraj

 

am remarcat asta pe asfalt ieri, la o parcare laterala

 

iar azi dimineata, am decuplat 4x4 si am plecat, s-a auzit un zgomot cam mare pe fata.... sper ca nu s-a rupt nimic

[roly]

Re: probleme viraj

 

Ok, Jimny din cate stiu eu are Part Time 4WD, este INTERZIS sa se foloseasca 4WD pe asfalt, pt ca nu ai Diferential central!

Trosnitul nu stiu ce a fost poate s au decuplat MRL-le.

Uite mai jos niste explicatii zic eu profesionale, sper sa iti fi fost de ajutor:

 

How to use part time 4WD on slippery pavement

 

 

Remember that 4WD pretty much only helps you to get going. Once moving, pt 4WD has significant drawbacks when used on slippery surfaces.

 

Here is how you use your pt 4WD vehicle most efficiently:

 

• Drive in 2WD most of the time (that's where the name "part time" is coming from - you use 4WD only part of the time)

 

• shift only into 4WD (don't forget to lock your hubs - if you have them) when you encounter snow, ice, or a rain slick road (if you have manual hubs keep them connected during the entire bad weather season).

• shift back into 2WD as soon as you encounter dry surface (pretty much all vehicles now have "shift on the fly" that allows shifting without stopping)

• you may even want to shift back to 2WD while still on snow - because some vehicles display a binding effect even on snow.

• if you encounter turns while in 4WD just know that the steering will not be as crisp as in 2WD (understeer will occur - the turn might be a little wider than planned)

• please be aware that ABS does not work properly with part time 4WD

• make sure the bed (if you own a pickup) carries about as much weight as the front (especially valid when using 2WD - because the rear is powered and has, because of the empty bed, the least traction of both axles, ). More weight = more traction

 

 

For off-road use part time 4WD system is perfect.

 

Only full time 4WD or AWD offers the performance on pavement you would expect from a vehicle this century. Most importantly: it can be used safely on pavement

(even "fake" full time AWD aka automatic AWD)

 

Only when going straight all four wheels are turning at the same speed rate (or at least about the same rate. I'll add a separate page to explain the exceptions)

 

As soon as a turn is initiated all four wheels will rotate at different rates since each of them follows a different imaginary circle.

This is what happens during a turn:

 

The inside wheels will rotate with less rpm than the outside wheels.

 

The differential on the rear axle guarantees that the rpm delivered via drive shaft from the transfer case are distributed to the left and right wheel as needed. Meaning equal rpm when traveling straight - less rpm to the inside wheel and more rpm to the outside wheel when in a turn.

 

The differential of the front axle does exactly the same thing.

 

The axle differentials take care of the need for different wheel rpm.

 

Interestingly enough during a turn the front axle needs more rpm than the rear axle. Here is why:

 

The front inside wheel will need more rpm than the rear inside wheel.

 

The front outside wheel will need more rpm than the rear outside wheel.

 

This means that the front wheels need more rpm than the rear wheels in a turn

 

When you add the rpm of front wheels (A+B) you will find that the number is higher than the combined rpm of the rear wheels (C+D).

 

Unlike full time 4WD - Part time 4WD is not able to accomodate the need for different axle speeds.

[Vizitator marmotavesela]

Re: probleme viraj

 

eu am mai avut doua vitara (una in 4 usi si una in 2) si ambele aveau aceleasi simptome la viraj maxim, dar nu se simtea atat de "urat" ca la jimny

 

explicatiile par destul de logice ( chiar si pentru mine care nu am o pregatire tehnica), deci astept sa vad daca se intampla ceva ( sper sa nu) sau pur si simplu astea's legile fizicii

 

mersi

[roly]

Re: probleme viraj

 

pai sa nu astepti. Sa nu mai mergi in 4WD pe uscat!!!

Foloseste 4wd numai cand e nevoie

[Astral]

Re: probleme viraj

 

La fel de buna este recomandarea de a rasfoi sectiunea Tehnica.....multe se vor limpezi citind acolo......

[uzi]

Re: probleme viraj

 

Cand rulezi cuplat incearca pe cat posibil sa eviti virarea rotilor la maxim nu e prea sanatos pt grup si mrl-uri iar trosnitul cred ca a fost la mrl-uri

[Vizitator marmotavesela]

Re: probleme viraj

 

mersi baieti!:tk

[LorDeko]

Re: probleme viraj

 

:op.... Cupleaza si u 4x4 doar atunci cand simti ca moare masina in panta sau cand intrii in "deep shit" :wink:. Eu nici iarna nu bag 4x4..... e mai funny 2x4 cu jimny:banana pe zapada. intreb si eu acuma: N-ar putea sa-i trozneasca si planetara la viraj maxim??