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slocum

Member Since: 16 Oct 2008
Location: Italy
Posts: 19

Clutch switch and throttle responce

Probably many of you had already tried to disconnect the clutch switch, as used on td5 engine, and discovered that... nothing happens!
I've done some tests and I've discovered that the clutch switch on Puma engine works the opposite way than td5 switch. This means that it's a normally open switch and its disconnection is completely aimless. The right way to "disconnect" this switch is to shortcut it.
After done this I couldn't believe I was driving the same car! The "acceleration tail" completely disappears and the throttle finally responds as it would!
Maybe this solution might be useful for defender affected by "running on" of throttle too. I hope you will appreciate my experience.
Goodbye!
JS

16th Oct 2008 7:50pm

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5035

2016 Defender 110 Puma 2.2 XS CSW Scotia Grey

Might this have something to do with the 2 different throttle settings.

High has little movement and low has full travel. Mike

16th Oct 2008 8:05pm

Landy nut

Member Since: 22 Dec 2007
Location: In hiding
Posts: 154

Is there anything like this that can be done to the TD5 and if so, how do I do it?? I am always trying to improve anything on mine until the warranty runs out, then I can do the other bits I want!!!

Thanks

Landy nut

16th Oct 2008 8:25pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8007

2011 Defender 110 Puma 2.4 USW Stornoway Grey

on a td5 the plug that goes into the top of the clutch m/c controlled the anti shunt, ie it held engine revs when you dipped the clutch to 'aid' smooth changes. in reality if you can drive its bloody annoying. disconnecting it stops this.

it seems from above that the it on the tdci it need to be disconnected and then the wires joined to effect the same mod. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

16th Oct 2008 9:03pm

slocum

Member Since: 16 Oct 2008
Location: Italy
Posts: 19

On Tdci you can join the wires without disconnecting them from the clutch switch. I simply put a t-tap between them.

On Td5 engine you must unplug the connector from the clutch switch.

17th Oct 2008 11:53am

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5035

So what does this actually give you real terms? Mike

18th Oct 2008 4:01pm

slocum

Member Since: 16 Oct 2008
Location: Italy
Posts: 19

Now, when I close the gas, it actually closes immediatly. With normal setting, expecially in Low range, it takes a second before it actually closes.

18th Oct 2008 4:36pm

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5035

slocum wrote:
Now, when I close the gas, it actually closes immediatly. With normal setting, expecially in Low range, it takes a second before it actually closes.

Mine is instant to Mike

18th Oct 2008 6:10pm

Landy nut

Member Since: 22 Dec 2007
Location: In hiding
Posts: 154

Sorry to be playing to idiot card here chaps, but when you talk about closing and gas etc, I get lost.

Could someone give me in idiots terms, what benefit doing this would have to my TD5???

Is it s throttle response thing or it is a faster pick up thing or what??

Sorry to ask the obvious question, but I just dont get this one.

Thanks

Landy nut

18th Oct 2008 6:40pm

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5035

Im understanding it to be put foot on clutch to change up and the revs build whilst foot is off the go peddle and on the clutch Mike

18th Oct 2008 6:42pm

slocum

Member Since: 16 Oct 2008
Location: Italy
Posts: 19

I'm sorry, I assumed that you already known this practice on Td5 engine. Not so easy for me, but I'll try to explain.
In normal conditions, when the clutch pedal is released, the ECU, to avoid shoks to the transmission, has a very slow response to the stepping off of the gas. If you can drive, this slow response is really aimless and annoying, mainly in off road driving.
When the clutch pedal is pressed, and this slow response becomes no longer helpful, the ECU cut the gas instantly. That's why many people use to disconnect the clutch switch on td5 engines.
I apologise for my ugly english! I hope you understand anyway.

18th Oct 2008 9:43pm

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5035

I dont think the TDCi is the same Mike

19th Oct 2008 9:05am

Tim_NZ

Member Since: 05 May 2008
Location: Australia
Posts: 177

From the TDCi workshop manual:

"The clutch switch is located on the clutch master cylinder. The clutch switch is a pressure transducer type. When the clutch is depressed the clutch switch sends a signal to the ECM (engine control module) which reduces engine torque."

Tim

19th Oct 2008 9:22am

slocum

Member Since: 16 Oct 2008
Location: Italy
Posts: 19

mse, no, it isn't the same. Have you read the first post? On td4 (unlike td5, where disconnecting the switch is enough) you must shortcut the wires. The td4 switch is a "normally open" switch, the td5 switch is a "normally closed" switch. But this is the only difference. The behaviour of both engines is very similar.

19th Oct 2008 9:41am

mse

Member Since: 06 Apr 2008
Location: UK
Posts: 5035

slocum wrote:
mse, no, it isn't the same. Have you read the first post? On td4 (unlike td5, where disconnecting the switch is enough) you must shortcut the wires. The td4 switch is a "normally open" switch, the td5 switch is a "normally closed" switch. But this is the only difference. The behaviour of both engines is very similar.

No what i meant was - i dont experience the symptoms of the TD5 on either TDCi's i had - so i dont think there is any point to messing around.

Further - there is a difference in how the throttle response is on the TDCi against the td5 - as mentioned above, low has a different map on the throttle than high - so again i dont think there is any point Mike

19th Oct 2008 11:29am

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