[928uk] 3 speed gear change rpm

[Ben Hodges]

Hi Todd

Yes could do an Oxford trip to see your progress!

I’ve assumed normal run in up to 1000 miles. Working through rev range and
no lugging the engine. Compression nice and even and no oil burn so all
good so far.

Cheers
Ben


On Wed, 5 Jun 2024 at 22:40, Todd Gibbs <toddgibbs111 at gmail.com> wrote:

> I forgot you rebuilt the engine - 600, that’s still quite low. What is
> recommended?
>
> I don’t know the history of my block (I bought a replacement one from Rob
> at Luxury Car Spares). He said it had 90k on it…. Believable, it doesn’t
> use any oil.
>
> Open invite here if you fancy a trip, clock a few miles on :)
>
> On 5 Jun 2024, at 22:36, Ben Hodges <benhodges1975 at gmail.com> wrote:
>
> 
> 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
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>