Thread: Has anyone compound turbocharged a TD5?

Originally Posted by disco_ute

Check this thread out.
http://www.aulro.com/afvb/showthread.php't=182417

Yeah, I've read that.. there's nothing about compound turbo sizing though...

Not so much about compounding but turbo sizes

Originally Posted by disco_ute

Not so much about compounding but turbo sizes

The size of your big turbo depends on your goals. It must be big enough to handle your highest expected flow. But the smaller you can keep it, the more it will add to low end boost as well.

First turbo I'd try is a T28 over the original GT2052. The 60mm, 60 trim (~46mm intake) wheels are capable of ~35 lb/min which makes them about 50% bigger flow wise than the GT2052.
This is ideal if you run about 12psi on the big turbo. Both turbos should work together very well.

Aftermarket ones are cheap, just check the compressor size. Some are too big, some are too small. This one is 60mm, 60 trim and about right: http://www.ebay.com.au/itm/T25-T28-N...item416c6d62f4

Originally Posted by Dougal

The size of your big turbo depends on your goals. It must be big enough to handle your highest expected flow. But the smaller you can keep it, the more it will add to low end boost as well.

First turbo I'd try is a T28 over the original GT2052. The 60mm, 60 trim (~46mm intake) wheels are capable of ~35 lb/min which makes them about 50% bigger flow wise than the GT2052.
This is ideal if you run about 12psi on the big turbo. Both turbos should work together very well.

Aftermarket ones are cheap, just check the compressor size. Some are too big, some are too small. This one is 60mm, 60 trim and about right: T25 T28 Nissan S13 S14 S15 Small Engine Universal Turbo Turbocharger | eBay

Sorry, I'm talking 300Tdi.

wouldn't the standard turbo on a 300 be too big for a compound setup? it doesn't produce boost till about 2000rpm, you want something that'll be making boost at 1500 or lower for the high pressure (smaller) turbo, don't you?

Originally Posted by *RR*

Sorry, I'm talking 300Tdi.

The air consumption and turbo sizing between a 300tdi and td5 is almost identical. They are both 2.5L tdi's with 2 valves per cylinder.

Originally Posted by *RR*

wouldn't the standard turbo on a 300 be too big for a compound setup? it doesn't produce boost till about 2000rpm, you want something that'll be making boost at 1500 or lower for the high pressure (smaller) turbo, don't you?

The big turbo will help it produce more boost down low. While a better (not necessarily smaller, just more efficient and faster boosting) small turbo would be ideal. It's a lot more work with the integrated manifold.

But if you want to swap the small one too. Then go for it.

Found this picture in the td5inside Facebook page.

Looks like a d2

Originally Posted by disco_ute

Found this picture in the td5inside Facebook page.

Looks like a d2

Great find. I knew someone had to have tried it.
Is that top turbo using the stock exhaust housing? I can't see clearly what's going on there. The compressor side appears changed at least.



The intake piping is strange.
Some foam thing doing an impression of a filter.
High pressure T bolt clamps holding the pipes with no pressure in them.
Not sure how they've joined the intake pipe to the big turbo.
Big turbo looks T3 or T28 (hard to tell).
Presuming that cast alloy pipe is boost from the big turbo into the small.
But the small turbo outlet tapers down small before looking like it branches into another larger pipe. That is the part that really makes no sense.

I'm wondering with the extra actuator off the back towards the firewall whether they've tried to make a system with a sequential stage or even bypass the small turbo when the big comes on boost (like the Borg Warner R2S does in some applications).

But it doesn't look like the Iveco setup or any other I've seen.

Must be a different use of terms, but I was under the impression that "TurboCompoundSupercharging" was the transfer of the rotational energy of the turbo mainshaft geared back to the crankshaft of the engine, Re: the engines in a B-29.

Les