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Volvo Servo Upgrade


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4 hours ago, JochemsTR said:

Volvo 960-940-740-760 with 8" diameter and 2 membranes.

if mounted onto a RHD, you need to check my adapter. it probably needs mirroring.

Cut a piece of wood and make a template out of my drawing. Take a piece of cardboard and make a 8" volume. Believe it or not, this is how I did it.

Jochem

And a part no for the brake master cylinder Jochem. Will the original Triumph master cylinder fit? 

What is the dimensions of the servo including the master cylinder in length?

As you can see I am keen to try this.

Regards Harry

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36 minutes ago, harrytr5 said:

And a part no for the brake master cylinder Jochem. Will the original Triumph master cylinder fit? 

What is the dimensions of the servo including the master cylinder in length?

Yes, the original master will fit. The whole thing will shift about 2" forward, so you need to extend or redo some of the brake lines. For a LHD it was the lines from the PDWA to the Master which are just a few inches. Not sure RHD.

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15 hours ago, ntc said:

So what’s the gain over original?

Higher ratio servo assistance, most moderns have a lot more assistance than original fitment on 5/6.

Stuart.

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50 minutes ago, ntc said:

Never had any problems with std can lock all four wheels if needed and so can the daughter 

I`m the same, if all the rest of the system is up to snuff then the brakes are very good. I dont even have a servo on my 4a and I can lock up all 4 without too hard a push on the pedal.

Stuart.

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Hi Stuart and Neil,

the lower vacuum on PI cars influences the servo effectiveness, off course. On my US-spec TR6 I never felt the need for a larger servo. But that was many moons ago, I got older, traffic much busier, and now I have a PI.

The standard brakes met the MOT requirements, but with the Volvo servo I can break easier/faster.

Cheers,

Waldi 

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24 minutes ago, Waldi said:

Hi Stuart and Neil,

the lower vacuum on PI cars influences the servo effectiveness, off course. On my US-spec TR6 I never felt the need for a larger servo. But that was many moons ago, I got older, traffic much busier, and now I have a PI.

The standard brakes met the MOT requirements, but with the Volvo servo I can break easier/faster.

Cheers,

Waldi 

I get to drive PI cars a lot, and dont really find them any different in the assistance and I know Neils cars are mostly PI too, I do know that wild cams give lower vacuum

Stuart.

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Hi Stuart,

I think it also depends on the drivers choice and in my case, physical condition.
Each to it’s own as they say.

Cheers,
Waldi

 

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12 hours ago, Waldi said:

Hi Stuart,

I think it also depends on the drivers choice and in my case, physical condition.
Each to it’s own as they say.

Cheers,
Waldi

 

Of course, a customer of mine needed a servo on his clutch due to loss of left leg strength.

Stuart.

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On 9/9/2021 at 9:12 PM, Steves_TR6 said:

I like your setup Gavin

could you let me have the part numbers as i might try something similar !

steve

Apologies for the slow response gents, been away for a few days.

I've attached some images which will hopefully be of help to those who my want to do the same.  The pump is Hella unit probably common to many VAG models, my son thinks it was a Q7, but it was a couple of years back and we knew what we were looking for when we went to Pick a Part so didn't take too much notice.  It's mounted in an accessory alloy fuel pump bracket on a fabricated steel tee fastened to existing bolts on the firewall.  The controller is a small adjustable vacuum switch I purchased off eBay from memory, used for controlling older auto transmissions as I mentioned.

At the moment all vacuum is from the pump, but at some point I will also connect the original manifold connection with a check valve to act as a backup.  The engine pulls 10" of vacuum at idle and I have the pump set to 13" with the ability to dial in even more if I want.  Works well as it is though.

Hope this helps :)

Gavin

 

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Deleted double post.

Edited by KiwiTR6
Double entry
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  • 2 weeks later...
On 9/11/2021 at 9:37 AM, stuart said:

Of course, a customer of mine needed a servo on his clutch due to loss of left leg strength.

Stuart.

I have a similar issue and would love to hear more about the clutch servo . I have been planning to use the Racterrations thrust bearing mod but a servo may be less hassle and cost.

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1 hour ago, Tony M said:

I have a similar issue and would love to hear more about the clutch servo . I have been planning to use the Racterrations thrust bearing mod but a servo may be less hassle and cost.

Its basically another brake servo fitted on the opposite side of the engine compartment and plumed into the clutch hydraulic line and "T" into the brake servo vacuum line as well.

Stuart.

 

Tonys TR6 624 - Copy.JPG

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20 minutes ago, Tony M said:

Hi Thanks for that. And does it feel really light now and give good control?

That was quite a few years ago but yes it really helped, the servos are available in different ratios so you can make it very light indeed.

Stuart.

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