compound turbo set up

**c.h.i.e.f** · 20th August 2012, 04:03 PM

Originally Posted by Dougal

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.

Thanks dougal....why I ask is when he mentioned cracked head I immediately thought indirect...either way good to see !! What turbos did you advise greg to use in particular HP ? This may help Dranged and others with some ideas...
Mmmm the 4bt's did come with varying types of IP from memory some harder to find than others , at least America has a considerable amount of after market performance upgrades for anything cummins related..

**Dougal** · 20th August 2012, 04:28 PM

I think he's using MHI (mitsubishi) TD series turbos. Greg found the maps and then the turbos himself. He's a very smart and talented guy, I was mainly there to bounce ideas off and confirm his maths and turbo choices. I think he's a murse (male nurse) during the day.
The MHI turbos are ones I've never looked into much. Despite the industrial 4BG1T's coming with them from the factory.

The only reason I've been so heavily into Garretts is those are the parts I have plenty of (due to the boy-racer industry here) and consequently the ones I have benchmarked on my own engine.

**c.h.i.e.f** · 20th August 2012, 06:37 PM

Oh ok that's interesting...is that Greg's only project ? I'm in the same boat with using Garrett's for those reasons...interesting about the 4bg1t

if I was to choose another motor I would go either 4 or 6bg I think.

**Dougal** · 21st August 2012, 06:01 AM

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

Oh ok that's interesting...is that Greg's only project ? I'm in the same boat with using Garrett's for those reasons...interesting about the 4bg1t

if I was to choose another motor I would go either 4 or 6bg I think.

Yeah like most guys find out, wife, kids and house really eat into your project time. This is his high altitude camping rig. The compound lets him drive at altitude where the NA diesels are crawling while blowing smoke and the single turbo rigs are losing boost and have EGT's climbing.

I beleive he also had a mate with a 300tdi disco who he was trying to beat. But somewhere along the line the disco was sold for a ford pickup with v8 powerstroke, so he still can't win.

**Bush65** · 21st August 2012, 09:37 AM

My compounds have a large internal wastegate in the HP turbine housing and none for the LP turbine housing.

From memory, the HP turbine nozzle is 5.3 cm^2 and the LP 12.5 cm^2. I doubt the drive pressure at the LP turbine will be so high as to require an external wastegate.

**c.h.i.e.f** · 21st August 2012, 09:45 AM

Originally Posted by Dougal

Yeah like most guys find out, wife, kids and house really eat into your project time. This is his high altitude camping rig. The compound lets him drive at altitude where the NA diesels are crawling while blowing smoke and the single turbo rigs are losing boost and have EGT's climbing.

I beleive he also had a mate with a 300tdi disco who he was trying to beat. But somewhere along the line the disco was sold for a ford pickup with v8 powerstroke, so he still can't win.

Yeah those things seem to hinder things a considerable amount... What's his maximum boost he can achieve ? Don't know to much about the power strokes but I don't think they are that great...

**DRanged** · 28th August 2012, 11:34 AM

Well the T70 arrived so it back under the bonnet to make it fit. Will keep you posted.

Justin

**DRanged** · 30th August 2012, 05:06 PM

Well well well
I think we have some potential!! First up no photos as the camera is on strike .

But a very quick run without the intake hooked up and it's promising. 10psi boost in a couple is seconds and pulls well holding boost all the way . EGT is a bit high down low but I will now go back to basics ie wind the fuel back and slowly bring it up along with the waste gate and will see what happens.

Could be on
Fingers crossed
Justin

**c.h.i.e.f** · 31st August 2012, 06:12 AM

Very promising

if were good what about a video ?

**DRanged** · 31st August 2012, 05:14 PM

OK
Tweaked up the oil feed lines and checked all the clamps etc.
Decided to do a couple of short test runs as I still dont have the conection from the LP turbo to the Donaldson sorted.

Ok first run full boost was only 10psi with low fuel setting, but still not bad. Second run I upped the fuel, much better but still 10psi. Bit sus on the waste gate actuator so I disconnected it?????

It then pulled 15psi through to half throttle and 23psi on fulll pedal. Probably still needs a little more fuel and a better actuator. Unfortunetly the HP turbo is sucking a bit of oil through

so I may check the delivery. Can you over feed these ??????? anyone . The other issue is this engine has had since a pump rebuild about 10 years ago, a spot where is hesitates if you are accelerating gradually. if you plant your foot to the floor, no problems.

So for now its sorting the air cleaner and watching the oil problem with the HP turbo.I need to re design the top radiator hose to make room for the air intake hose etc. Also have a vibration through the car which I think is exhaust related as it has been modded so many times now (I have braced the LP turbo down to the AC compressor for support). This project has had its moments but interesting all the same. Would be keen to get my hands on a Turbo IP unit at the right price one day.

No more turbo mods for a while as my business venture needs some quality input from me for a while.

Justin

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