[928uk] 3 speed gear change rpm

[Ben Hodges]

:-)

On Thu, 6 Jun 2024 at 13:48, Todd Gibbs <todd at oxfordeye.co.uk> wrote:

> Knowing my car it would say “burbo Toast”
>
> On 6 Jun 2024, at 13:45, Ben Hodges <benhodges1975 at gmail.com> wrote:
>
> 
> Did they have it rigged up to a button labelled ‘Turbo Boost’?
>
>
>
> On Thu, 6 Jun 2024 at 13:29, todd via 928uk <928uk at lists.928.org.uk>
> wrote:
>
>> All this fun chat about my bloody 3 speed has reminded me that when I got
>> the car someone had bodged in a thick red cable and toggle switch near the
>> steering wheel. I assumed it was an ignition switch by pass and blindly cut
>> it out (I never traced the wires back to where they were connected - my
>> bad).
>>
>> Now Im wondering (since my ignition all seems good and Im been in that
>> area quite a bit) if the switch was actually a kickdown trigger. More when
>> I get in there (and locate the wires I snipped!)
>>
>> Todd.
>>
>> -----Original Message-----
>> From: 928uk <928uk-bounces at lists.928.org.uk> On Behalf Of Paul R Smith
>> via 928uk
>> Sent: Thursday, June 6, 2024 11:38 AM
>> To: jonathan at rackowe.net
>> Cc: 928UK List <928uk at lists.928.org.uk>
>> Subject: Re: [928uk] 3 speed gear change rpm
>>
>> Wow, fancy going to the trouble of adding a relay, but not making that
>> switch the inductive load.
>> I know that the latest cars (perhaps just 94-95) had a throttle movement
>> sensitive version so it kicked down due to fast movement of the pedal as
>> well as WoT, but even then the power to the solenoid is still controlled by
>> the switch.
>>
>> Note that the "'speedo' FCU relay on the CE panel" is only there on cars
>> after they changed to getting the speed signal from the ABS, up to 1990
>> they got the speed signal from the reed switch on the back of the diff.
>>
>> Smiffy
>>
>> On 06/06/2024 11:10, jonathanrackowe at gmail.com wrote:
>> > No, on later models all the kickdown solenoid current still passes
>> through the kickdown switch. The kickdown relay on later models was added
>> to allow kickdown to be disconnected electronically in certain
>> circumstances. The kickdown relay contains electronics and receives a speed
>> signal from the 'speedo' FCU relay on the CE panel.
>> >
>> > Best regards,
>> > Jonathan
>> >
>> > 1991 928 GT Amethyst Metallic
>> >
>> >
>> >
>> > -----Original Message-----
>> > From: 928uk<928uk-bounces at lists.928.org.uk>  On Behalf Of Paul R Smith
>> > via 928uk
>> > Sent: 06 June 2024 10:29
>> > To:928uk at lists.928.org.uk
>> > Subject: Re: [928uk] 3 speed gear change rpm
>> >
>> > Makes me wonder if they fitted a relay to later models because the
>> > switches were burning out?
>> > I've sent you the page from the '78 wiring diagram.
>> >
>> > Smiffy
>> >
>> > On 05/06/2024 20:27, todd via 928uk 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
>> >>
>> >>
>> >>
>> >>
>> >>
>>
>>