[928uk] Fwd: Re: PSD operation] & Tyre pressures]

[Paul R. Smith]

No, you wouldn't be able to do that, the sensors themselves are on or off.

Smiffy

On 09/02/2012 23:55, Mark Nichols wrote:
> That makes sense. Considering my everyday journeys are mostly 30 - 50
> mph&  I always check and adjust for longer runs, I'll give it a try.
> I seem to remember the TPS warning can be overridden with a resistor?
> I wonder if one could make it variable threshold with a variable
> resistor... The intention being to retain TPS function but be able to
> set at a preferred trigger point.
>
> Cheers
>
>
>
> ---------------------------- Original Message
> ---------------------------- Subject: Re: [928uk] FW: [Fwd: Re:  PSD
> operation]&  Tyre pressures From:    "Paul R.
> Smith"<smiffypr at clear.net.nz> Date:    Thu, February 9, 2012 10:35
> am To:      928uk at lists.928.org.uk
> --------------------------------------------------------------------------
>
>  I used to drop the tyre pressures in the winter by about 5psi, but
> didn't have RDK. The standard tyre pressures are set to prevent
> overheating at high speeds, but don't allow the tyres to warm up on
> cold, wet, straight roads.
>
> The RDK sensors are temperature dependant, the given pressures being
> for 20C, so you should be able to get away with a little less in the
> cold weather, but probably not enough to get extra grip without the
> warning going off.
>
> Smiffy
>
> On 09/02/2012 23:25, Mark Nichols wrote:
>> Thanks Smiffy, I am pleased the function appears correct. You are
>> right, I need to gain more experience. First car I have driven with
>> an LSD and last night was unintended. Just poor driving. Cold
>> night, cold tyres and poor road surface all conspired. I run
>> standard wheels and T1R tyres at handbook pressures of 44psi rear
>> and 36psi front. My TPS system works and nags readily if pressures
>> drop by more than about 2psi. 44 Seems quite high for the rear. Do
>> any 928'rs run at reduced pressures at all or is the 44psi
>> considered optimum? I havn't run these tyres far enough to see if
>> they are wearing in the middle yet.
>>
>> Regards Mark N 90GT
>>
>>
>>
>> ---------------------------- Original Message
>> ---------------------------- Subject: Re: [928uk] PSD operation
>> From: "Paul R. Smith"<smiffypr at clear.net.nz>  Date:    Thu,
>> February 9, 2012 9:57 am To:      928uk at lists.928.org.uk
>> ----------------------------------------------------------------------
>>
>>
----
>>
>> That all sounds like it is working correctly. The PSD does back
>> off the locking gradually.
>>
>> In a cornering situation, with an open diff, the inside wheel
>> would loose grip, limiting the torque to the outside wheel,
>> allowing it to keep the rear end in line. With the PSD preventing
>> the inside wheel spinning, it allows you to apply more throttle in
>> the same situation, so when both wheels loose grip the back end
>> goes more sideways. So, if you are using the extra grip that the
>> PSD gives you, you need to be extra careful. Lifting off the
>> throttle sharply makes it worse.
>>
>> You really ought to practice in a safe place rather than on a
>> sharp country bend.
>>
>> Smiffy
>>
>
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