Freelander 1 Engine RPM

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TSR2

TSR2

Active Member
Posts
146
Location
Edinburgh
Assuming level ground etc. what should the expected engine rpm be for 70mph in 5th gear?

I ask because previously my engine would run at just under 3000rpm, now it sits at just below 2750rpm at the same speed in same conditions. I have had an injector replaced last month and a new clutch a few weeks ago, but it's only today the RPM has done this.

I know this may be an impossible question to answer, but 250rpm seems a big jump.

EDIT: I've a 2004 TD4.
 
freelance said:
Could be new injector making it more efficient, perhaps consider changing the other three !
Click to expand...

I thought that, but then I changed the injector at the start of December and it's just today I've seen a change. Does the ECU (or whatever it's called) control things like this?
 
The speed the engine spins for a given road speed is purely dependent on gear ratio and nothing else. If so then the clutch has likely been slipping which would account for the higher engine RPM. For reference, my TD4 SE auto engine spins at about 2700 RPM, when the speedometer indicates 70 MPH, when the box is in 5th, with the TC clutch locked. If the TC clutch is open, then the engine spins at about 3100 for the same 70 MPH.
 
as above. Ratio of rpm to speed is flywheel speed through the gearbox to wheels. Doesn't matter on state of the engine.
Could have been the clutch slipping, that would have meant you pressing on the accelerator though.
 
You've just fitted a new clutch - it might be that the old clutch was slipping allowing the enigne to spin faster at any given roadspeed whereas thenew one is proplery connecting the two. But Nodge is right:
Nodge68 said:
The speed the engine spins for a given road speed is purely dependent on gear ratio and nothing else. If so then the clutch has likely been slipping which would account for the higher engine RPM. For reference, my TD4 SE auto engine spins at about 2700 RPM, when the speedometer indicates 70 MPH, when the box is in 5th, with the TC clutch locked. If the TC clutch is open, then the engine spins at about 3100 for the same 70 MPH.
Click to expand...
 
I've got a spreadsheet I put together a while back for calculating tyre sizes * gear ratios * Diff * Transfer Box * Portal Box and comparing road speeds versus dyno outputs I'd be happy to share? It's still a bit work in progress, as in I haven't got the pull down menus fully working, but the basic calculations are there and the pretty graphs work.

upload_2020-1-20_4-6-59.png


upload_2020-1-20_4-7-27.png


upload_2020-1-20_4-6-59.png
upload_2020-1-20_4-6-59.png

upload_2020-1-20_4-11-13.png

upload_2020-1-20_4-8-13.png


The pull downs work for the gearbox selections, but not the engine selections...
 
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