TPMS sensors and GT4 wheels

[BHD_GT4]

Hello wheel/tyre afficionados....

I have a 718 GT4. Bought another set of GT4 wheels (981) and find the new TPMS sensors don't screw down into the threads fully.

Is there a difference between the 718 GT4 and 981 GT4 wheels in terms of TPMS thread ?

I know the TPMS sensors themselves are different (hence getting new ones).

Thanks.... G

 

[Motorhead]

According to Google AI Overview [so it must be correct!]:

The TPMS sensors are not interchangeable between the 981 and 718 GT4, as the two generations use different parts, despite having some similarities in wheels. The 718 GT4 uses a more modern system with different sensors than the older 981 GT4, so you cannot simply use a 981 sensor on a 718 or vice versa.

Jeff

 

[Greenman986S]

Why are you switching sensors?
Just buy another set

 

[BHD_GT4]

Thanks for the replies.

I have two sets of wheels.

• One with summer tyres, original sensors. All good.
• The second set of wheels came off (I believe) a 981 GT4.

I've bought a new set of sensors (OEM by Huf) as specified for 718/Macan. They don't screw in fully i.e. the threads seem to be incompatible.

Hence my question. Is there a difference in the 718 wheel from the 981 wheel ? I doubt it, but thought I'd check before the "to and fro" with the folk in Germany who sent me the 718 TPMS sensors.

 

[Motorhead]

Understood, but as noted in my previous post it seems that there are differences between the 981 and 718 GT4 wheels and sensors, so presumably that also applies to the threading arrangement?

Are you certain that your second set are genuine 981 GT4 wheels? Your local Porsche dealer will be able to provide you with the correct part number which - I think - could be present on the inner face of one of the wheel spokes.

Jeff

Edit: 981 GT4 wheel part numbers should be:

Front: 981.362.162.80 [8.5J x 20 ET61]
Rear: 981.362.166.81 [11J x 20 ET20]

There are different suffixes for finishes, e.g. Platinum Satin-Matt is OB5, etc.

 

[Greenman986S]

im still missing why you didn't buy 981 sensors for the 981 wheels?

 

[BHD_GT4]

The wheels came with 981 sensors. I need 718 sensors in them as the car is a 718 ! Bought them. I went to swap them over from the old 981 sensors and they don't fit.

The EAN for the sensor is 4053861005596 (Huf - the OEM part). The wheel is a Porsche wheel.

All very odd. I would expect the screw fitting to be the same.

 

[Motorhead]

Are the actual threads different or is the problem one of seating. If the latter maybe you could use a shim/washer to get a decent fit.

Jeff

 

[BHD_GT4]

Hi Jeff. It's the thread - it doesn't allow the sensor screw all the way in.

The part number confirms they are genuine Porsche 981 GT4 wheels.

 

[Greenman986S]

Have the 981 wheels been refurbed?

 

[BHD_GT4]

Good question ! Not to my knowledge, and they are all the same.

 

[Greenman986S]

It is as a conundrum you have

I thought all (Porsche) TPMS operated on the same frequency... so i would have expected the original TPMS in the 981 wheels to still work. I still dont understand why you need "718" sensors?

or did the 981 wheels come without TPMS?

 

[Motorhead]

I think I’m struggling to understand the issue here. The valve has an O-ring seal on the inner face and the nut clamps the assembly to the wheel on the outer face of the wheel. The TPMS sensor either can be attached to the valve with a screw or is bonded to the valve.

Assuming you’re swapping the complete valve/TPMS sensor unit, are you saying that you’re unable to clamp the 718 valve tight in the 981 wheel? I’m guessing that you can’t just swap the TPMS sensors?

Some pics could be helpful.

Jeff

 

[Twinfan]

I think your issue may be the valve stems, or specifically their size, on the correct sensors. I did a lot of research a few years ago as I have two sets of wheels like you do, except both of mine are OEM 718 GT4 wheels. I have Huf sensors and they fit and work perfectly.

Looking back at my documents from the time, there are different part numbers for 718 sensors (RDE047V21) and 981 sensors (RDE048V21) and they have what looks like different valve stems:

718: https://www.autodoc.co.uk/huf/9763000#tyre-pressure-sensor-tpms

981: https://www.autodoc.co.uk/huf/14124015#tyre-pressure-sensor-tpms

So it could be that 981 wheels have a smaller valve stem diameter opening than 718 wheels? As Jeff says, can you just swap the 981 stems onto the 718 sensors?

I cannot find the EAN 4053861005596 on AutoDoc to check what you have. Is there a typo?

 

[Scrounger]

I found these Huf ones on AutoDoc for the 718 GT4 and GTS4.0

https://www.autodoc.co.uk/huf/17499773

Dan

 

[Motorhead]

I think your issue may be the valve stems, or specifically their size, on the correct sensors. I did a lot of research a few years ago as I have two sets of wheels like you do, except both of mine are OEM 718 GT4 wheels. I have Huf sensors and they fit and work perfectly.

Looking back at my documents from the time, there are different part numbers for 718 sensors (RDE047V21) and 981 sensors (RDE048V21) and they have what looks like different valve stems:

718: https://www.autodoc.co.uk/huf/9763000#tyre-pressure-sensor-tpms

981: https://www.autodoc.co.uk/huf/14124015#tyre-pressure-sensor-tpms

So it could be that 981 wheels have a smaller valve stem diameter opening than 718 wheels? As Jeff says, can you just swap the 981 stems onto the 718 sensors?

I cannot find the EAN 4053861005596 on AutoDoc to check what you have. Is there a typo?

Could be Dave, although you’d have thought that valve stem diameters and respective hole sizes in the wheel would be standardised … maybe not?

Difficult to tell specifically any differences from the pics of the two Huf valves and sensors you’ve referenced since they’re not-like-for-like. It does look as though the sensor on the 718 unit is detachable though.

Jeff

 

[Twinfan]

Yep, I would have thought it would be the same for both models Jeff but maybe not. If "Greenman986" is right, and the TPMS sensor is the same for both 981 and 718 models, then the only difference between the Huf sensors for each, as they have different reference numbers, would be the valve stems.

There are different references for the different colours (silver, grey, black) but they're all the same basic part for each model series - either RDE047V21 or RDE048V21 - as far as I can tell.