Thread: Disco 4 SDV6 3 Litre power/torque upgrade

Originally Posted by DieselLSE

Justin, do you have a theory as to why the intake manifolds split? Is it just the plastic becoming brittle over time? Could the gunk that develops with the EGR system have anything to do with it?

Poor design and indifferent manufacturing... I have customers at double the km others have got to without a split. The QC is obviously non existent on these parts. It's a lottery, an expensive one, in my opinion.

I will say that was one of the few reasons why I bought a V8Diesel L322.....

Originally Posted by justinc

Poor design and indifferent manufacturing... I have customers at double the km others have got to without a split. The QC is obviously non existent on these parts. It's a lottery, an expensive one, in my opinion.

That and use... lots of heat soak isn’t as bad, but constant hot/cold repetition will likely accelerate it...

What people won’t see is the update to the pattern to make the part stronger in the current replacements.

Originally Posted by Tombie

What people won’t see is the update to the pattern to make the part stronger in the current replacements.

Do you know what year the updated parts started shipping?

Originally Posted by DieselLSE

Do you know what year the updated parts started shipping?

I think they’re up to nearly double digit revisions, so they continue to update it over time.

Originally Posted by justinc

My advice with the 3.0 , especially the 8spd ones , is not to be too quick to remap... the intake manifolds are happy to burst open with standard boost and heat levels...🤬.
As regards dash readouts, mine (not a D4) is 1.4l/100 optimistic.

Yes notedit is a lottery. Mine's done 195,000Km and had the remap, no issues to date (touch wood), DJ has the same car, and had had to replace both manifolds, others have done far less kms and had them fail, others done many more trouble free kms, definitely a random thing, can't seem to do much to prevent it.

My tune runs about 2psi over standard across the rpm range, my Rovacom shows a peak of about 178psi manifold pressie under hard acceleration held in 3rd . Current issue is the inlet plenum o ring clip dislodging, and one of the manifold outlet o rings is leaking. New orings on the way..

Originally Posted by Eric SDV6SE

Yes notedit is a lottery. Mine's done 195,000Km and had the remap, no issues to date (touch wood), DJ has the same car, and had had to replace both manifolds, others have done far less kms and had them fail, others done many more trouble free kms, definitely a random thing, can't seem to do much to prevent it.

My tune runs about 2psi over standard across the rpm range, my Rovacom shows a peak of about 178psi manifold pressie under hard acceleration held in 3rd . Current issue is the inlet plenum o ring clip dislodging, and one of the manifold outlet o rings is leaking. New orings on the way..

The sdv6 is certainly a weapon. Even without a remap. Hence my comment about leaving it stock when using these things for towing. Not towing, the duty cycle of high temps and pressures are significantly reduced.

So, from reading the above, I should be ok to remap my 2013 TDV6 8 speed. From what I know it’s the same car as the SDV6 but a different engine map.

Originally Posted by John_D2

So, from reading the above, I should be ok to remap my 2013 TDV6 8 speed. From what I know it’s the same car as the SDV6 but a different engine map.

This is long discussed topic with various opinions from the various posts.

I spoke to Roo systems who said yes we can take the TDV6 (post '13) to the same power/torque as the Roo Systems tuned SDV6.

However, Gally at autocade said he only takes the TDV6 to the SDV6 (untuned) figures and the SDV6 he takes to the TDV8 based on the SDV6 having stronger conrods and pistons than the TDV6.

Make what you will from above.