Thread: Aftermarket TD5 exhaust manifolds

Ooops! TBH the weld penetration where it split was pretty poor, but the amount of time that went into trying to get this thing to work was too much for the return, warped it once, cut the flange & skimmed, then this on the motorway. Weldel's just not a good idea for 5 cylinders.

That design looks pretty average. The same size pipe is used post merge of all five cylinders as what is used for the primaries. Looks a bit under sized.

assuming diesel exhaust tuning works the same as petrol---
thats a really bad manifold,,
are the turbo requirements that restrictive??

Originally Posted by Pedro_The_Swift

assuming diesel exhaust tuning works the same as petrol---
thats a really bad manifold,,
are the turbo requirements that restrictive??

Diesel exhaust tuning is completely different to petrol. The best manifold for a turbo diesel is normally a log-type manifold as-in the picture, however the straight line from cyl3 to the turbo does not look good (among other things)....

APT Fabrications ceramic coated manifold (supplied by Ben at APT but he will do your own if you supply it) with JE Engineering studs/spacers. Details of these are earlier in the thread IIRC.

Apologies for the phone photo. I'll get another couple tomorrow and update the thread.

I had the exhaust replaced at the same time - minus the centre muffler (and the EGR removed also). It's definitely got a little more drone and volume at anything over about 60km/h.

But it now has substantially less turbo lag.

(And no, I didn't want the EGT probe tapped into the actual manifold. There was a perfectly good blanking plate over the front end of the manifold given that the EGR wasn't going back on. As they say: if you want a job done properly...do it yourself! Grrrrr.)

As per this thread:
http://www.aulro.com/afvb/showthread.php't=207645

Originally Posted by sjane

That stainless one has some negative feedback on ebay. Something about poor fit and poor quality.

I bought the stainless one. It does not fit, at least on a Disco, as it fouls on the A/C compressor. The stud holes weren't that well aligned either.

Originally Posted by justfishing

I have quite a good tune and VNT on mine and got a plate made up by these people in the UK been running it for around a year no problems fits between the manifold and head
Thermal Products

Cheers Ian, but I don't see how that would help in preventing the exhaust manifold from warping. Ferriday Engineering describe their Thermal Exhaust Plates (T.E.P.s) as:

to reduce heat-soak from the exhaust manifold back into the cylinder head casting

and

An exhaust manifold (especially turbo) is a large store of heat that should not be allowed to find it's way back into the head ? limiting this heat transfer can only be a good thing.

So the focus is on preventing additional heat to the head rather than reducing the temperate of the exhaust manifold to stop it warping.

I think the inlet manifold insulator is a better idea from them.