How much torque and hp are the W58 boxes known to hold ?

Hi everyone,

Things have gone quicker than expected for me as i now own my own single turbo kit that make a good 600hp and 550Nm of torque (limited).

My plans were to get a proper gearbox before the single kit... but ok... =)

I'll get the car mapped (greddy emanage ultimate) beginning next year and would like to know if I drive the car with care (only accelerations, no launches or so) would the W58 hold or not ?

I mean I'll change to box asap but really would like to get the car singled before because this won't appear that soon...

Don't want to trash the box as I would like to put it in an IS300 in the future...

Thanks in advance for your help !

I'm pretty sure 500ft lbs of torque is the upper limit and with two oil coolers is the number that's usually passed around

Hum okay... not good for me ^^'

And for the R154 ? Maybe i could get one for a little moment...

The boxes can let go in BPU twin turbo swaps, so will not take the levels your kit can make. They say the torque kills them more than BHP, but unless you severely limit the boost/power/torque from the stated level it can make then it's going to be a massive risk. You'll end up having to map it for low boost and then remap later for more if you can't wait for the stronger gearbox replacement.

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R154 is a lot stronger.

Okay thanks for the tip mate

I wanted to go very low on boost and simply adding other boost level once i got an other gearbox... this with my greddy profec boost controler... but would like to know how far I could go with the W58 first...

Another thread with a blown W58, BPU twin turbo engine and plenty of abuse it seems over time but went eventually.

http://www.mkivsupra.net/vbb/showthread.php?227498-Gearbox-blown-at-trax&highlight=gearbox+blown

Haha crazy guy there x) I definately won't use the box like this, only a few straight pulls... Will talk with my tuner tomorrow to know his mind about the story

Is this kit going on your NA 2002 car, ie will be an NA-T conversion?

My kit will go on a 2002 VVTI engine out of an aristo that comes to me next week... the kit is already on a VVTI engine that I'll put back to stock shape soon.

504bhp and 578nm and mine's still holding up, touch wood.

504bhp and 578nm and mine's still holding up, touch wood.

Any additional cooler used ?

Snap am on an Aristo TT lump and running full BPU on a W58 box. 2 years later and still going ok. Al be going single at some point and al just replace the box wen it lets go

Mine was fine at 350hp. Finally killed it around 430hp with 450 ft.lbs of torque.

Torque will kill the box quicker than HP. Using a VVTI engine, it is easy to get quite high torque low down, so careful with that.

Killed mine at 450bhp/400ftlb, no launches just on a hard 4th gear pull. Fitting a single on a W58 is a terrible idea

I always regurgitate this info when stuff like this comes up, but the metal will potentially fatigue crack eventually, ie it can do the same pull over and over until one day the same pull or even a less stressful one can cause catastrophic failure. It's not linear but the lower the power/stress level put on the components the more cycles of this stress they can handle and vice versa.

You can design into materials/components such that the stress levels they see, mean they never enter into the danger zone ie there is a stress level at which the cycles it can endure is infinite (ie a w58 and 220bhp even with clutch dumping and miss shifts), so you are just down to the more usual synchro and other surface type wear. Once beyond this safe stress level (and in a W58 we don't know what this is) you are entering into the fatigue failure possibility and depending on individual component defects (tiny cracks/voids/impurities in the metals) you can get varying results.

So all we have to go on is user feedback, which is varied as you'd expect, but don't necessarily think because Harrypm82 is on 500+ bhp yours will therefore definitely last the same as his has, it might go on the first pull, it's a lottery and if I was going to use the gearbox elsewhere in the future I would stick in the sub 400 range, or at least have a setting at this and a slightly higher one if you must.

Scooter, thanks for you input.

I won't have the choice, I'll let the box into it and will hold my fingers crossed.

I for sure won't pull the car, by the moment in drives correctly this will be great.

Let's save some money for a T56

had 2 w58 gearbox's , 360bhp twins there was no crunches in the gear both happened in 3rd gear pulls

Mines on 430Nm single turbo, delivery is very smooth and gradual on the map and i think has helped it survive as long as it has. I do granny it around a lot of the time, but have pushed limits with it too, so far its taken the abuse quite well. I would recommend full service on the W58 before you do anything else. Secondly, do NOT get a competition stage 4 clutch, for the love of god.

I running vvti tt w58

381hp and 370trq

Running good at the moment

My box only have 50.000km and has always seen n/a power so... I ll certainly do the 1st mapping with it :/ we will see!

Thanks for this info - very useful for me too.