[928uk] 3 speed gear change rpm

[Ben Hodges]

Sent you the wiring diagram for my 82 - I doubt it’s different. Last page
of the wiring diagram set so maybe yours is missing it.

Cheers!

On Wed, 5 Jun 2024 at 22:21, Todd Gibbs <todd at oxfordeye.co.uk> wrote:

> Good to check, thank you :)
>
> Hoping next time I work on the car I’ll have the gear change resolved
>
> Todd
>
> On 5 Jun 2024, at 22:19, Ben Hodges <benhodges1975 at gmail.com> wrote:
>
> 
> Just checking Todd!
>
> On Wed, 5 Jun 2024 at 20:41, Todd Gibbs <toddgibbs111 at gmail.com> wrote:
>
>> Thanks Ben, yes I know the solenoid - had my face pressed up to it for
>> most of the last week lol.
>>
>> Curious how it’s wired though, I can’t see it on the 79/80 current flow
>> diagram.
>>
>> But, 99% sure it’s kicking down now :)
>>
>> Todd
>>
>> On 5 Jun 2024, at 20:38, Ben Hodges <benhodges1975 at gmail.com> wrote:
>>
>> 
>> It’s a solenoid and it’s the square looking thing with a wire connected
>> to it below the lever on the right side of the box.
>>
>> Can send a pic if needed.
>>
>> You should hear a click when the kick down switch is pressed and another
>> click when it’s released.
>>
>> Cheers
>> Ben
>>
>> On Wed, 5 Jun 2024 at 20:29, todd via 928uk <928uk at lists.928.org.uk>
>> wrote:
>>
>>> Hi Smiffy,
>>>
>>>
>>>
>>> Mine is a 1979 car, so I don’t think it has a kickdown relay? But… I
>>> made a temp fix to shorten the Bowden cable and it now changes at 4500rpm
>>> AND it kicks down. I just need to make a better fix (aka properly) and
>>> adjust the locking bolt on the throttle pressure thing (side of gearbox
>>> that the Bowden cables connects to)
>>>
>>>
>>>
>>> Thanks,
>>>
>>> Todd.
>>>
>>>
>>>
>>> From: Paul R Smith <smiffypr at gmail.com>
>>> Sent: Wednesday, June 5, 2024 9:39 AM
>>> To: todd at oxfordeye.co.uk; 928uk at lists.928.org.uk
>>> Subject: Re: [928uk] 3 speed gear change rpm
>>>
>>>
>>>
>>> The next test along this line of investigation is, repeat test with
>>> ignition on, can you here a relay click when your pedal operates the
>>> switch. You may need to expose the fuse-board to hear it.
>>>
>>> Smiffy
>>>
>>> On 04/06/2024 21:33, todd at oxfordeye.co.uk <mailto:todd at oxfordeye.co.uk>
>>> wrote:
>>>
>>> Hi Smiffy,
>>>
>>> Yes, I hear the click - tested and it does not kick down though. That’s
>>> a problem for future Todd.
>>>
>>> Todd.
>>>
>>> -----Original Message-----
>>> From: 928uk  <mailto:928uk-bounces at lists.928.org.uk> <
>>> 928uk-bounces at lists.928.org.uk> On Behalf Of Paul R Smith via 928uk
>>> Sent: Tuesday, June 4, 2024 9:15 AM
>>> To: 928uk at lists.928.org.uk <mailto:928uk at lists.928.org.uk>
>>> Subject: Re: [928uk] 3 speed gear change rpm
>>>
>>> When you push the pedal the last few mm to the floor (engine/ignition
>>> off), can you hear the kickdown switch click?
>>>
>>> Smiffy
>>>
>>> On 04/06/2024 07:25, toddgibbs111--- via 928uk wrote:
>>>
>>> Hi Llew,
>>>
>>> So, throttle is sharper, zero play. Perhaps a little too tight as I
>>> noticed the idle siting at 1100 (I think cable is keeping it open slightly).
>>>
>>> Anyway, gear changes at 4100 rpm still.... I'll get under the car today
>>> and see what I can find.
>>>
>>> Todd.
>>>
>>> -----Original Message-----
>>> From: Llewelyn Guildford <mailto:llew.guild at gmail.com> <
>>> llew.guild at gmail.com>
>>> Sent: Monday, June 3, 2024 4:50 PM
>>> To: Todd Gibbs <mailto:todd at oxfordeye.co.uk> <todd at oxfordeye.co.uk>
>>> Cc: 928 <mailto:928uk at lists.928.org.uk> <928uk at lists.928.org.uk>
>>> Subject: Re: [928uk] 3 speed gear change rpm
>>>
>>> Hi Todd
>>>
>>> No worries, I’ve been there myself with a lot of what you’re doing so
>>> it’s quite relaxing viewing from the sidelines!
>>>
>>> Can you send a photo?
>>>
>>> Let me know what it is like with the throttle cable adjusted , you might
>>> find it sorts itself out because the throttle actuator is what pulls on the
>>> gearbox shift cable and if it’s too slack it won’t work properly! The
>>> gearbox cable is definitely adjustable though, sorry I can’t explain the
>>> exact steps.
>>>
>>> Llew
>>>
>>> Sent from my iPhone
>>>
>>>
>>> On 3 Jun 2024, at 16:09, Todd Gibbs via 928uk <mailto:
>>> 928uk at lists.928.org.uk> <928uk at lists.928.org.uk>  wrote:
>>>
>>> Hi Llewelyn
>>>
>>> Thanks for watch the videos :)
>>>
>>> Ok I’ve had the airbox off again today and there is no adjustment there
>>> in mine. I know exactly where you are thinking (there is a hard tube rising
>>> from the bell housing that thur cable passes through). Mine just has a
>>> flexible cable “shield” that connects to the hard pipe.
>>>
>>> I’ve gone back and adjusted the throttle cable, it was slightly loose,
>>> and about to test it out….
>>>
>>> Thanks and will report back
>>>
>>> Todd
>>>
>>>
>>> On 3 Jun 2024, at 09:42, Llewelyn Guildford <mailto:
>>> l.guildford at stemmer-imaging.com> <l.guildford at stemmer-imaging.com>
>>> wrote:
>>>
>>> Hi Todd
>>>
>>> I follow your project on YT - Great progress 😊
>>>
>>> It's a while since I've done this (2017 I think!) so hopefully my memory
>>> serves me semi-well!
>>>
>>> The cable is adjustable - Although the adjuster doesn't look obviously
>>> so. It seems hard to find an image of it online. The adjuster isn't as an
>>> end of the cable, it is half way down. It is located slightly right of
>>> centre if you're looking from the front of the car, and is situated behind
>>> the airbox on or near the bell housing, so if you take off your airbox and
>>> look down behind the bulkhead, standing on the left hand side of the car
>>> you should be able to see it. I can't remember in detail exactly how to
>>> tension it but it is fairly obvious.
>>>
>>> Check list for correct shifting:
>>>
>>> Make sure the kickdown switch is working, is adjusted correctly and
>>> that the throttle pedal actuates it at WOT (all this can be done
>>> stationary) Make sure the gearbox has the right level of oil in it and
>>> that the oil is in reasonable condition I've personally never had to mess
>>> around with the vacuum modulator thing on the gearbox and I've had quite a
>>> few 3 speed 928s.
>>>
>>> Then move on to the cables
>>>
>>> Start with the throttle cable and get it tensioned so it's nice and
>>> tight but doesn't bind! Once you're happy with that adjust the elusive
>>> Bowden cable and you should be good to go.
>>>
>>> Gearbox side I would a) not mess with the vac modulator other than
>>> to make sure there are no vacuum leaks b) whatever you've altered on
>>> the cable mount bolt I'd put it back to the original position
>>>
>>> 9 times out of 10 gearboxes run perfectly after this.
>>>
>>> When you've got a baseline result you can then drive, make a small
>>> adjustment to the Bowden cable either way then compare - You'll find your
>>> own sweet spot with it!
>>>
>>> If you need a hand ever I do find myself in Oxford from time to time so
>>> could pop over and have a look with you...
>>>
>>> Hope this helps,
>>>
>>> Llewelyn
>>>
>>> -----Original Message-----
>>> From: 928uk <mailto:928uk-bounces at lists.928.org.uk> <
>>> 928uk-bounces at lists.928.org.uk>  On Behalf Of Ben Hodges
>>> via 928uk
>>> Sent: Sunday, June 2, 2024 7:12 PM
>>> To: Todd Gibbs <mailto:todd at oxfordeye.co.uk> <todd at oxfordeye.co.uk>
>>> Cc: 928 List <mailto:928uk at lists.928.org.uk> <928uk at lists.928.org.uk>
>>> Subject: Re: [928uk] 3 speed gear change rpm
>>>
>>> Hi Todd
>>>
>>> I’ve sent you a couple of docs that may help - apologies if you
>>> already have them
>>>
>>> Cheers
>>> Ben
>>>
>>>
>>> On Sun, 2 Jun 2024 at 16:43, Todd Gibbs via 928uk
>>>  <mailto:928uk at lists.928.org.uk> <928uk at lists.928.org.uk>
>>> wrote:
>>>
>>> Gents,
>>>
>>> Someone put me out of my misery - how do I adjust my 3 speed
>>> gearbox change up rpm?
>>>
>>> Currently it changes at 4100rpm.
>>>
>>> My Bowden cable is not adjustable, it has press fittings both ends.
>>> I’ve adjusted the pressure module and now my gear changes are
>>> punchier (good), but same 4100rpm. I’ve adjust the bolt thing on
>>> the side of the gearbox in the mechanism that the Bowden cable pulls on.
>>> 4100rpm still.
>>>
>>> So I’m at a loss. What else is there?
>>>
>>> Thanks for any help
>>>
>>> Todd
>>>
>>>
>>>
>>>
>>>
>>>