JB74 Traction Improvements

2022 JB74v  K15B Engine  M13AA Manual Trans  
I want to increase my prowlness while off road. It seams to me that the stock factory setup relys on high RPMs and momentum to get through the tough spots. My preferred technique is to use fences and deliberate torque with controlled wheel spin. What has worked for other JB74s? Would I be gaining anything by installing Limited Slip Differentials vs. the OEM AllGrip Pro system? Interested in reading the discussion on this topic. 

wrote:

2022 JB74v  K15B Engine  M13AA Manual Trans  
I want to increase my prowlness while off road. It seams to me that the stock factory setup relys on high RPMs and momentum to get through the tough spots. My preferred technique is to use fences and deliberate torque with controlled wheel spin. What has worked for other JB74s? Would I be gaining anything by installing Limited Slip Differentials vs. the OEM AllGrip Pro system? Interested in reading the discussion on this topic. 

What sort of terrain have you driven so far?

The All Grip Pro traction control system isn’t bad. You generally just need to keep a smooth steady throttle. But I admit it can be easy to let the revs rise with the wheel spin.

Ultimately traction control needs some slip and wheel spin in order to activate and work.

Full locking diffs would remove the wheel spin. But are generally quite pricey for a full install. You also only get benefit when they are locked. But you loose the ability to turn as well as normal. Lockers are great for the right purpose. But IMO are a bit specialised and may not suit every situation.

An ATB (automatic torque biasing limited slip differential) should offer improved performance over stock. As it will require far less traction control braking to activate. The diffs would work well without traction control. But should almost simulate a full locker when combined with it. But you’ll retain mostly good steering and turning circle. They are usually cheaper to buy and install. And they work all the time. Even on the road. Making them much more versatile.

Other things to consider are suspension. The ability to keep all 4 wheels on the ground will reduce the need for traction aids such as fancy diffs or traction control. And of course the right tyres for the terrain.

Lower gearing could improve crawling. But would likely still need revs to some extent. And an automatic gearbox does make the standard TCS easier to deploy. The Jimny with a manual can be stalled on tricky low speed technical terrain. But the traction control will fundamentally work the same and still require the same wheel differential speeds to activate, regardless of gearbox type.

From what i have seen from the performance of the Gen4 and the All Grip it works very well. Only thing is with very loose sand/surface and full articulation combined.
ARB is the best option in most cases as it switches fully off and fully on.
But with the latest price raise and the currency the cost is way out of my wallet. Last time i checked an ARB would put me back twice as much as from when i bought it 12 years ago. I paid approx 600£ for mine then.

As you are a beginner, you need to appreciate that your Jimny is better than you. You need to drive it enough for you to understand the system and improve yourself to the point that you are better than the Jimny. Then you can consider what are your options to improve the Jimny. As a starter I would suggest you join an off-road club and look, listen and ask questions.

Roger

Roger Fairclough wrote: As you are a beginner, you need to appreciate that your Jimny is better than you. You need to drive it enough for you to understand the system and improve yourself to the point that you are better than the Jimny. Then you can consider what are your options to improve the Jimny. As a starter I would suggest you join an off-road club and look, listen and ask questions.

Roger

What he said, cant stress that enough. Get in car and learn it.

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I have a Quaife LSD in my 1.6 Gen3 Jimny and it's a worthwhile addition for both road and off-road. My Jimny doesn't have traction control, but the braking action of the system should enhance the operation of the LSD even more.

wrote:

Ok I think I understand what you are aiming for. The easiest though most expensive option is to buy an automatic gearbox version.. I have one and just being able to creep up and over obstacles is the future. The next option is to buy a reduction gear set for the transfer box these typically reduce the low gearing from around 2to1 to more in the 5to1 region depending on which you get. This allows the wheels to turn so much slower. Additional traction like a limited slip differential whilst beneficial won't on its own give you what you want.

Lambert; Thanks for your thoughts. Gear reduction is also on the work list I believe.
 

wrote:

wrote:

2022 JB74v  K15B Engine  M13AA Manual Trans  
I want to increase my prowlness while off road. It seams to me that the stock factory setup relys on high RPMs and momentum to get through the tough spots. My preferred technique is to use fences and deliberate torque with controlled wheel spin. What has worked for other JB74s? Would I be gaining anything by installing Limited Slip Differentials vs. the OEM AllGrip Pro system? Interested in reading the discussion on this topic. 

What sort of terrain have you driven so far?

The All Grip Pro traction control system isn’t bad. You generally just need to keep a smooth steady throttle. But I admit it can be easy to let the revs rise with the wheel spin.

Ultimately traction control needs some slip and wheel spin in order to activate and work.

Full locking diffs would remove the wheel spin. But are generally quite pricey for a full install. You also only get benefit when they are locked. But you loose the ability to turn as well as normal. Lockers are great for the right purpose. But IMO are a bit specialised and may not suit every situation.

An ATB (automatic torque biasing limited slip differential) should offer improved performance over stock. As it will require far less traction control braking to activate. The diffs would work well without traction control. But should almost simulate a full locker when combined with it. But you’ll retain mostly good steering and turning circle. They are usually cheaper to buy and install. And they work all the time. Even on the road. Making them much more versatile.

Other things to consider are suspension. The ability to keep all 4 wheels on the ground will reduce the need for traction aids such as fancy diffs or traction control. And of course the right tyres for the terrain.

Lower gearing could improve crawling. But would likely still need revs to some extent. And an automatic gearbox does make the standard TCS easier to deploy. The Jimny with a manual can be stalled on tricky low speed technical terrain. But the traction control will fundamentally work the same and still require the same wheel differential speeds to activate, regardless of 

 

I believe there are locking diffs available. I think the Gen 4 axles are largely the same as the Gen 3, so diffs for those should work. I've certainly seen YouTube vids of people with locking diffs on a Gen 4.

However, I am a big fan of ATB diffs. Even with no TCS they work well and will help with keeping all 4 wheel spinning on loose surfaces. Where they lack compared to a full locker is if you have wheels in the air. Traditionally left foot braking would be used here. However when you have traction control it will do it all for you, so they should work very well in every situation and require you as the driver to do nothing other than drive like normal.

www.jimnybits.com/suzuki-jimny-atb-lsd-f...ntial-by-quaife.html
www.jimnybits.com/suzuki-jimny-atb-lsd-r...ntial-by-quaife.html

Lambert; Thanks for your thoughts. Gear reduction is also on the work list.300bhton; Thank you for taking the time to share your thoughts. You have touched on a couple of interesting points.  The terrain is steep (14° ) with cobble and washouts are common.  While the All Grip Pro handles traversing the majority of the trail well, there are those sections where more is needed.  And before I start pulling cable, I thought there might be another option.  It doesn't look like ARB has a locker available for the JB74s yet.  Does the All Grip Pro system work with ATB LSD, or is it one or the other?  A suspension upgrade is planned, but further down the list.

Miownway wrote: Lambert; Thanks for your thoughts. Gear reduction is also on the work list.300bhton; Thank you for taking the time to share your thoughts. You have touched on a couple of interesting points.  The terrain is steep (14° ) with cobble and washouts are common.  While the All Grip Pro handles traversing the majority of the trail well, there are those sections where more is needed.  And before I start pulling cable, I thought there might be another option.  It doesn't look like ARB has a locker available for the JB74s yet.  Does the All Grip Pro system work with ATB LSD, or is it one or the other?  A suspension upgrade is planned, but further down the list.

ARB have lockers. I've been running one for over 3 years on my jb74.

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