[928uk] 3 speed gear change rpm

[Ben Hodges]

Excellent

Actually it’s second from last - the last is for the factory alarm but I’m
not sure if that was on your early car.

I’ve not really tested my WOT gear changes yet - engine now has 600 miles
on it since rebuild so maybe that’ll be this weekends task.

On Wed, 5 Jun 2024 at 22:32, Todd Gibbs <toddgibbs111 at gmail.com> wrote:

> Ah amazing! Yes that’s missing from my doc. Really confused me :)
>
> It seems to be kicking down now, and surprisingly lively…. Maybe even
> quite fast!
>
> It seems my Bowden cable has stretched a bit, so even at max adjustment
> it’s not changing the change up rpm. I’ve inserted a bit of fuel pipe to
> lengthen the cables path, making it tighter. That took change up from 4100
> to 4500. I noted the adjuster is midway so I think by adjusting it to max
> it will take rpm to over 5000. Will find out tomorrow :).  Hope that made
> sense lol
>
> Thanks again for the help :)
>
> On 5 Jun 2024, at 22:24, Ben Hodges <benhodges1975 at gmail.com> wrote:
>
> 
> 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
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>