[928uk] 3 speed gear change rpm

[Ben Hodges]

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
>>
>>
>>
>>
>>
>>