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rev limiter

daimler jack
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Posts: 1529
Joined: Sun Aug 17, 2014 7:48 pm

rev limiter

Postby daimler jack » Wed Nov 02, 2016 6:59 pm

so we have a 1989 3.6 runs and drives spot on lots of power only 88k but when you flour it will kick down fine then rev up as per normal but itl rev to 5700 rpm hit the rev limiter 5 or 6 times then change gear. never had a 40 do that before it sounds interesting but really is not the best for overtaking stuff does anyone have any ideas ?
1991 Daimler 4.0 auto (long term project)
1986 jaguar 3.6
1991 Daimler 4.0 auto
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pimgmx
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Posts: 3048
Joined: Tue Jul 08, 2014 12:07 pm
Location: South East of the Netherlands

Re: rev limiter

Postby pimgmx » Wed Nov 02, 2016 9:06 pm

Ignition checked?
Dizzy cap & rotor OK?

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Starbuck
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Posts: 681
Joined: Thu Mar 19, 2015 4:48 am
Location: Melbourne, Australia

Re: rev limiter

Postby Starbuck » Wed Nov 02, 2016 10:55 pm

Hi Daimler Jack,

It sounds to me like you have a governor or kickdown switch/cable problem with your transmission if it refuses to change up when bouncing off the rev-limiter. Have you tried backing off the throttle slightly so the pedal isn't nailed against the kickdown switch to see if it changes up then? What happens if you change it down and then up manually at the rev limit?

I'm afraid I don't have much expertise with the ZF4 as installed in early 40s, but if it is anything like the installation in other cars at the time I would start to look at things like kickdown cable/switch adjustment if it only happens at full throttle. If the transmission in the earlier cars gets a full throttle signal from the throttle position sensor like the later cars do it could also be a dirty TPS (I'm sure someone like Naki will correct me if the early cars don't use the TPS for transmission signals), but then I would expect to see a transmission fault light.

If it is a sticking governor you could try doing a filter and fluid change on the transmission and see if running clean fluid helps (or take it to a transmission shop and get them to flush it), but otherwise the governor will have to be disassembled and sorted (transmission shop job really). From memory the governor is towards the back of the transmission on the ZF4 and it can be worked on without removing the transmission from the car.

Good hunting,

Starbuck
'94 XJ12 (and other toys)

old del boy
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Location: Kent

Re: rev limiter

Postby old del boy » Thu Nov 03, 2016 2:05 am

daimler jack wrote:so we have a 1989 3.6 runs and drives spot on lots of power only 88k but when you flour it will kick down fine then rev up as per normal but itl rev to 5700 rpm hit the rev limiter 5 or 6 times then change gear. never had a 40 do that before it sounds interesting but really is not the best for overtaking stuff does anyone have any ideas ?


Yes , drive slower Jack , i've never had either of my Daimlers rev up that high , i don't think my licence would last long at those revs :lol:

Derek..
'93 4.0L Daimler, solent blue,
'93 4.0L Daimler, Westminster,
'85 2600 Rover sd1 vdp oporto.


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