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Richard Houlgate

Sierra Viscous diff torque setting

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I suspect that my diff may have been set too tight so I've taken it to Bara to investigate.

But what torque setting should it have? (Car is SeiW, 2.3 duratec, close ratio box, used in the Speed Series)

Advice welcomed!

 

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180 Nm comes to mind as its what Steve's car had if I remember correctly

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That's 130 ft lbs, Bara was talking around 120.

I guess this is a critical aspect of the set up (and an expensive one!), it will be interesting to know what the unit is currently set at, I'll report back.

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Bara did my diff to 240Nm.

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yes but you have a V8 with massive torque I presume

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Barra did mine as well, works great, setting? haven't a clue.

I would have thought that it's not interested in what the engine puts  into the diff as the LSD engages when it senses slip between the two wheels. Or I missed the plot again?

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50 minutes ago, terry everall said:

yes but you have a V8 with massive torque I presume

Bara didn't know that though. Just his 'Uprated VC' setup.

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Are you all talking about the same setting????

 

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Bara reports that the diff was set to 180nm but is now 160. A it would cost £280 + VAT to have it altered I'll leave it as it is.

So the diff wasn't too tight after all and my slow corner exit excessive understeer must have another cause. Driver?!

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21 hours ago, TableLeg said:

Bara didn't know that though. Just his 'Uprated VC' setup.

Correction, mine IS set to 180Nm. 240Nm was the max with the standard plates on the 7.5" and 300Nm possible with uprated Nickel plates. Just checked my Email from 4 years ago.

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3 hours ago, Richard Houlgate said:

So the diff wasn't too tight after all and my slow corner exit excessive understeer must have another cause. Driver?!

Could be a lot of things, any videos?

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No videos, the car is well balanced on fast corners but on tight hairpins as at 3 Sisters the car understeers when accelerating on corner exit. This can probably be avoided by a change in driving style I think.

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