Re:Add-ons and GVM

wrote:

By the way, does a GVM update include higher spec. brakes?
 

Not the ones I've looked at (the Ironman GVM upgrades are a stiffer suspension that have been certified by the relevant authorities), and that is what I would be more concerned about.

The stock JB74 brakes are a relatively small, thin solid rotor and it probably wouldn't take much to overheat it and warp it.

wrote:

Why would you need different brakes? It’s not as if the Jimny is under brakes in stock trim. And as you said the GTW doesn’t change.

I'd consider the stock brakes as marginal and we're no longer talking "stock trim" here, this is a Jimny that's already pushing weight limits and it's also not just the weight that matters. 

The thread starter hasn't told us what tires he has fitted but I doubt that he's running the stock 195/80R15, simply switching to a wider tire requires significantly more braking force because of the added rotating weight.  I learned this the hard way in my "hot hatch" days, same weight vehicle, wider tires, higher speeds, I didn't have the "braking power" to really slow the vehicle and ended up overheating the discs and warping them.

I run an older GV with larger than stock tires, the brakes on that are acceptable after a pad change (I'm running EBC on that vehicle) and one of the first things I explored when I bought my JB74 was the options for better brakes, I haven't done anything beyond exploring the options as the JB74 is more or less "unmolested" essentially just the 215/75R15 AT tires, which by the way is the size that Suzuki fits to certain models.

We're scheduled to get the five door Jimnies next year and I'm considering replacing the GV with one, and that would get quite a bit more than a tire change, that comes with ventilated discs so it's going to be one less thing for me to worry about.

Jimny can tow 500kg unbraked. So the vehicle is already rated to tow the weight being discussed. If the GVM upgrade simply takes from the towing payload I can’t see it being an issue. Which is likely why the GVM upgrade does not come with different brakes.

Of course other mods can impact braking. But in the case of the op (Assuming they are in Oz). The GVM upgrade should have no impact on what their brakes may already have to cope with.

Tow limit for the Gen.4 is 1300 kg braked and 350 kg un-braked. Info. taken from the technical spec. issued by Suzuki.

One of the mods. I am considering is a vented disc conversion with a better quality pad. I am not a heavy on the brakes but the standard fitment does not inspire confidence.

Roger

I have ebc pads on tem and standard ones on spare Jimny and they are otherwise identical yet on the MOT rollers I pull an extra 100kg per front wheel or as it is half as much again. I consider that useful as I regularly tow live loads at maximum train weight and without tempting fate thus far I have yet to find the limits of my ability to stop. That said I will be changing the fluid for 5.1 next service for extended fade resistance. Therefore I would suggest that solo even over gvm the braking is fine certainly I'm less worried about being able to stop and more worried that something in the back may decide to come loose and pay me a visit in the back of my head.

wrote:

Tow limit for the Gen.4 is 1300 kg braked and 350 kg un-braked. Info. taken from the technical spec. issued by Suzuki.

One of the mods. I am considering is a vented disc conversion with a better quality pad. I am not a heavy on the brakes but the standard fitment does not inspire confidence.

Roger

Different specs for different territories. But the point still stands for either figure.