Turbos.

[Dougal]

So there are three turbos that came on the 4BD1T and bolt up to three different manifolds.

An IHI-RHB6, wastegated, basically a japanese T3 with 60mm wheels both ends. Top mounted.
A wastegated garrett, possibly a T25. Top mounted.
A non-wastegated garrett, which has a T25 compressor and bolts to the T3 flange on about a 45deg angle. Same turbo and manifold as the 4BD2.

I've got the IHI and non wastegated garrett in my collection. Has anyone got the wastegated garrett or have any specs on it?

[andrew e]

bugger it. just get these. Yes i was very very tempted.

http://cgi.ebay.com.au/TWIN-TURBO-KIT-INTERCOOLER_W0QQitemZ250167697339QQihZ015QQcategor yZ43807QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Andy:p

[Dougal]

bugger it. just get these. Yes i was very very tempted.

http://cgi.ebay.com.au/TWIN-TURBO-KIT-INTERCOOLER_W0QQitemZ250167697339QQihZ015QQcategor yZ43807QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Andy:p

What are they off? A poxy rotary?

[1103.9TDI]

Hey Dougal, welcome back, Landy on the road yet??........

[Dougal]

Hey Dougal, welcome back, Landy on the road yet??........

Not quite, but getting close.
After screwing me around for 3 months, the place that was making my new gearbox-LT230 shaft screwed it up.

A little more internal machining on that, a new engine mount and it all goes back in.:)
Then I can start working on project silliness.:D

Bush65 came out with some figures for fuel delivery from the stock pump. With a few assumptions it looks like 200hp will be all you'll get by turning the screw. But that should give 550-600Nm if all goes well and the engine holds the boost.:twisted:

[1103.9TDI]

Sounds promising, hey, bit off topic, but I saw a post on a boost controller, do you reckon it might work with the IHI if I adjust the fuel up at the same time?......

[Dougal]

Sounds promising, hey, bit off topic, but I saw a post on a boost controller, do you reckon it might work with the IHI if I adjust the fuel up at the same time?......

Nah, it's perfectly on topic.;)

I tried boost controllers and hated them. I now cut the wastegate rod and install a threaded section. That lets me wind the boost from nothing to the max the turbo can sustain without having anything hissing air under the bonnet.

On my IHI I could push 19psi max with standard fuelling. It went best at 15psi, but my aneroid (fuel pump boost compensator) was rooted at the time. Below about 12psi the EGT's were higher than I liked.

[1103.9TDI]

Yeah, ok, it might be worth me looking at that option later on, once I get an EGT gauge fitted......the less non standard adjustable bits (ie:boost controller) the better I guess.....I'm hoping the intercooler will keep exhaust temps down.
Any thoughts on Dieselgas, as per Aussie 4WD Monthly, October issue, looks like a good option, if there's room for a descent sized gastank......

[Dougal]

Any thoughts on Dieselgas, as per Aussie 4WD Monthly, October issue, looks like a good option, if there's room for a descent sized gastank......

Yeah, run the other bloody way.

Basically the lpg detonates, giving you a lot of power but making life hell for your engine and pistons.

If you're rallying, circuit racing or such then go for it. But if you want a reliable vehicle then I'd never go there.
Here's another discussion on the topic on eng-tips, note the guy who reports more iron and aluminium in the oil after using lpg fumigation.:(
http://www.eng-tips.com/viewthread.cfm?qid=197876&page=1

[andrew e]

What are they off? A poxy rotary?

Yeah i think so. Thats why i didnt bid. However if it was off an rb26........ now that would be another story. mabe one day.

Hey thats some cool tech on diesel gas setups, have you heard of anymore bad reports?

Andy

[rar110]

I am currently researching turbos for a bolt up.

The most consistent recommendation from turbo dealers seems to be for a Garrett gt28 with .48 a/r exhaust and .60 a/r compressor - for quick spool with out running out of puff at high revs.

I think Justin uses a high flow t25 with .48 a/r exhaust and is very happy.

A couple of others have used/recommended t25s from nissan rb20 that from memory have a/r of .64 exhaust .60 a/r compressor.

I have also been recommended a mitsubishi TD05 - 16G (used on the Evolution) which sounds like about the same size as t28 or t3 garrett.

I have been told the later NPRs with the 4BD1T were fitted with a t25 with exhaust a/r .67 and compressor a/r .48.

I also had a look at a new chinese 4bd1t at Brisbane, was fitted with a tiny Garrett turbo - i'm guessing it was a t20. These were top mounted but the turbo flange was raised so the outlet fed straight accross the top of the motor.

I think I will either go with a new GT28R or 2nd hand high flow T25 if I can find one.

[Dougal]

Yeah i think so. Thats why i didnt bid. However if it was off an rb26........ now that would be another story. mabe one day.

Hey thats some cool tech on diesel gas setups, have you heard of anymore bad reports?

Andy

I've got a single turbo from a RB26DETT at home. It's a T2860, just a little on the large side for one of our engines, but I plan to use it for the big one in my compound setup.

Here's another interesting Engtips thread on the subject.
http://www.eng-tips.com/viewthread.cfm?qid=171405&page=1
And a related picture
https://www.aulro.com/afvb/images/imported/2007/09/97.jpg

[Dougal]

I am currently researching turbos for a bolt up.

The most consistent recommendation from turbo dealers seems to be for a Garrett gt28 with .48 a/r exhaust and .60 a/r compressor - for quick spool with out running out of puff at high revs.

I think Justin uses a high flow t25 with .48 a/r exhaust and is very happy.

A couple of others have used/recommended t25s from nissan rb20 that from memory have a/r of .64 exhaust .60 a/r compressor.

I have also been recommended a mitsubishi TD05 - 16G (used on the Evolution) which sounds like about the same size as t28 or t3 garrett.

I have been told the later NPRs with the 4BD1T were fitted with a t25 with exhaust a/r .67 and compressor a/r .48.

I also had a look at a new chinese 4bd1t at Brisbane, was fitted with a tiny Garrett turbo - i'm guessing it was a t20. These were top mounted but the turbo flange was raised so the outlet fed straight accross the top of the motor.

I think I will either go with a new GT28R or 2nd hand high flow T25 if I can find one.

IMO T28's are too big.

I have run a T25 from a Nissan CA18DET and will again shortly (I lost an oil line and blew it up). It has a 0.48 A/R turbine housing and starts to spool approx 1400rpm, max boost arrived a little over 2000rpm (last time I had it running, the engine was quite sick, hopefully can update that soon).
A T25 with slotted holes will bolt to the IHI manifold.
I ran it with both boost and backpressure gauges. As a single turbo replacement for the IHI it's your best bet.

A T3 will bolt straight up to the 4BD2 style manifold, they are available in a range of suitable sizes from tiny to too big.
RB20 turbo is a T3 and probably your best match in that series.

The later 4BD1 and 4BD2 turbos are T25 non wastegated with a T3 inlet flange. Compressor is identical internally to the CA18DET T25 that I have.