compound turbo set up

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Originally Posted by Geeman

Hey there, just wondering are you using internal waste gates or external wastegates? I have been doing a bit of research myself, and quite a few of the setups i have seen have huge external wastegates plumbed on the small turbo and appropriate sized one for the large turbo. Keep going, dont give up!!!!

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At the moment just an internal on the HP turbo. If and I mean IF this system seems to work I may investigate external wastegates. Keeping in mind I have only undertaken this as a bit of an exercise with a very low budget.

Justin

You'll only need to wastegate the big one if boost gets out of control. Shouldn't be a problem.

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Originally Posted by Dougal

You'll only need to wastegate the big one if boost gets out of control. Shouldn't be a problem.

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True Dougal it wont be a problem ( be great if it was though)I'm positive. Even if it was maybe a blow off valve would do the trick.

Should have the T70 this week I hope will wait and see.

Justin

You can over-speed a turbo with a blow-off valve. Wastegates are better. But I think it's only the guys running smoke propelled darkness factories that end up with too much boost.

Hey Justin, have a look at this link,

3B compound turbo, 25psi boost!?!

this bloke did a compound turbo setup on a toyo 3b and it seems to work really well. might get some new ideas


cheer Goran

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Originally Posted by Geeman

Hey Justin, have a look at this link,

3B compound turbo, 25psi boost!?!

this bloke did a compound turbo setup on a toyo 3b and it seems to work really well. might get some new ideas


cheer Goran

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Video is here:
[ame="http://www.youtube.com/watch?v=so6F-Wn5qBo&feature=player_embedded"]3B compound turbo - YouTube[/ame]

I'm asuming that dougal refered to in the video is yourself?

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Originally Posted by c.h.i.e.f

I'm asuming that dougal refered to in the video is yourself?

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:angel:

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Originally Posted by Dougal

:angel:

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Movie star!!!! Is the motor featured in video a worthy type of candidate ? (in comparison to the 4bd)

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Originally Posted by c.h.i.e.f

Movie star!!!! Is the motor featured in video a worthy type of candidate ? (in comparison to the 4bd)

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Thanks, Greg (owner and video maker) and I did a lot of background planning on that one. He got to do all the real work.

That's a toyota 3B. 3.4litre indirect injection.
It's an okay engine, but being indirect has a weaker head and lower efficiency than the Isuzu. This means it produces less power and torque for the same displacement and boost. Main bearings are from memory about 10mm smaller, so the bottom end is a little less robust too.
But if you are in Canada, it's one of the few diesels you can get.

The factory injection pump on them (similar to our Isuzu's but on the other side of the block, smaller pump elements and with a pneumatic governor) is only good for around 400Nm maxed out.
I keep trying to convince Greg to buy a Cummins 4BT A pump (similar size to our Isuzu pump, but on the same side of the block as the 3B ) and see if he can make it fit. They go for about $US100 as 4BT owners think they don't work on the road.:(
But so far he's been too busy.