Offroad-Express

i keep reading all the posts about safari 4.2 diesel upgrades and everyone seem to use different types, i know mitch uses a ct26 and after being in his truck i know this has bloody awesome results its just the ct26 seems more complicated to fit. so anyway i was looking for the most cost effective and easier fitting route, so is there an 'ideal 'turbo model to get and what part number, what cars are they fitted to.

T28 with a 0.64 A/R exhaust housing would be my pick.
I'd stay away from the toyota turbos, they're an expensive dead-end as far as parts supply goes and they all run non-standard mounting flanges.

There are a whole range of turbos that will work. Do you want one that gives you more low end or top end? What's your budget?
Do you have an existing turbo manifold that it has to fit?

KiwiBacon wrote:T28 with a 0.64 A/R exhaust housing would be my pick.
I'd stay away from the toyota turbos, they're an expensive dead-end as far as parts supply goes and they all run non-standard mounting flanges.

There are a whole range of turbos that will work. Do you want one that gives you more low end or top end? What's your budget?
Do you have an existing turbo manifold that it has to fit?

i have no parts its a new project, budget around $1500 and would like power lower down, want to start looking out for parts now to collect together..

muskie wrote:

KiwiBacon wrote:T28 with a 0.64 A/R exhaust housing would be my pick.
I'd stay away from the toyota turbos, they're an expensive dead-end as far as parts supply goes and they all run non-standard mounting flanges.

There are a whole range of turbos that will work. Do you want one that gives you more low end or top end? What's your budget?
Do you have an existing turbo manifold that it has to fit?

i have no parts its a new project, budget around $1500 and would like power lower down, want to start looking out for parts now to collect together..

For power down low, that's the turbo to have. Tardme is probably full of them as they came stock on a lot of turbo petrol nissan cars.
Once you've got a manifold, you may need to adapt the manifold flange to the turbo. No big deal, I have designs to do that which any half-decent workshop can follow.
You'll get it all done for $1500 if you do a lot of the work yourself and find a good priced manifold. If you want an intercooler it'll be a very tight budget.

the turbo manifold will be your most expenisve part unless you can make it yourself

KiwiBacon wrote:

muskie wrote:

KiwiBacon wrote:T28 with a 0.64 A/R exhaust housing would be my pick.
I'd stay away from the toyota turbos, they're an expensive dead-end as far as parts supply goes and they all run non-standard mounting flanges.

There are a whole range of turbos that will work. Do you want one that gives you more low end or top end? What's your budget?
Do you have an existing turbo manifold that it has to fit?

i have no parts its a new project, budget around $1500 and would like power lower down, want to start looking out for parts now to collect together..

For power down low, that's the turbo to have. Tardme is probably full of them as they came stock on a lot of turbo petrol nissan cars.
Once you've got a manifold, you may need to adapt the manifold flange to the turbo. No big deal, I have designs to do that which any half-decent workshop can follow.
You'll get it all done for $1500 if you do a lot of the work yourself and find a good priced manifold. If you want an intercooler it'll be a very tight budget.

t28's came only on gtir's and some very late modle silva's

if the t28 is perfect then why not a TD05 off a evo ? there a miles better turbo and you can get them cheap as chips

vvega wrote:t28's came only on gtir's and some very late modle silva's

if the t28 is perfect then why not a TD05 off a evo ? there a miles better turbo and you can get them cheap as chips

Skylines also, can't remember which skyline but I have a T28 from one here.
The TD05 could be an option, but I know more about the T28, hence the recommendation. The T28's also have the benefits of being very cheap to rebuild because they're part of the T25 family and having a very common mounting flange.

r33 gtr has the twin t28's r32 has twin t25's
in saying that the t25 off a late silvia is ball bearing and they can push 200kw out of a sr ...woudl that be any good ?
i dont know much about d turbo's done a fair bit with petrol turbo's though

vvega wrote:r33 gtr has the twin t28's r32 has twin t25's
in saying that the t25 off a late silvia is ball bearing and they can push 200kw out of a sr ...woudl that be any good ?
i dont know much about d turbo's done a fair bit with petrol turbo's though

The big T25's are T25G. I had one.
Unfortunately they're a big trim design which makes them not suitable for high boost at low rpm (which we need on a diesel). They'll surge if asked to deliver that.
So the T28 with it's bigger compressor wheel (60mm vs 51.3mm on the T25G) is better for our purposes.

I'm running a T25 from a CA18DET on my Isuzu (that's a normal size T25) but I'm running it right off the right side of the map sometimes, I don't recommend anyone else copy me.

i origionally thought of the sd 33 nissan diesel set up as an idea, but i guess if it was that easy everyone would do the same??

muskie wrote:i origionally thought of the sd 33 nissan diesel set up as an idea, but i guess if it was that easy everyone would do the same??

That was just a T3 turbo on a cast manifold wasn't it?

KiwiBacon wrote:

vvega wrote:r33 gtr has the twin t28's r32 has twin t25's
in saying that the t25 off a late silvia is ball bearing and they can push 200kw out of a sr ...woudl that be any good ?
i dont know much about d turbo's done a fair bit with petrol turbo's though

The big T25's are T25G. I had one.
Unfortunately they're a big trim design which makes them not suitable for high boost at low rpm (which we need on a diesel). They'll surge if asked to deliver that.
So the T28 with it's bigger compressor wheel (60mm vs 51.3mm on the T25G) is better for our purposes.

I'm running a T25 from a CA18DET on my Isuzu (that's a normal size T25) but I'm running it right off the right side of the map sometimes, I don't recommend anyone else copy me.

td04 then ?

If I was to do it again, a TD05-H with either 16G or 18G compressor side would be sweet. 20G would be the same as what I've got at the moment and just a bit too big unless you've got a bigger fuel pump. This is the same turbo with upgrade options (i.e. 16G as standard, but upgrade to 18G or 20G) as the DTS kit put out by MTQ in Aussie.

Daemon, you're pretty handy with a welder, I'd say you can build the manifold yourself, otherwise you'd be looking at $1k as a minimum.

I have a Garrett T04z 1.06 A/R and that works pretty well. Ok so not a diesel but hey it is a Safari turbo!!

And if you are talking 'ideal' then it has to be a BB turbo. Spools quicker but is bigger so you get more top and bottom end power. Costs more but the benefits are well worth it.

As most will know a turbo has a certain speed it works best at. If you go too small then the turbo could be outside of it's optimim range at the top end or to big and it will have lag. A ball bearing turbo has a wider range that it will work efficiently in.

It is a case of 15psi with a lot of heat will put in less 02 than 12psi with no heat and it is 02 that you are trying to get more of not pressure.

My advice is talk to the Garrett importers (via an agent like Topgear Autotech) and get them to spec the turbo for you. This is there job and they do it dam well. Technically my turbo is about 200hp to big but they said it will work and it does. eg 2psi at 2000rpm and 10psi from 2900rpm till redline. All I aksed for was boost at 2000 and peak torque at 3000 and this is what I got but it is good for 800hp yet I have under 600hp.

Also search 'Outerlimits' as there was a thread about a BB turbo kit a few months ago and that probably has what you're after.

muskie wrote:i origionally thought of the sd 33 nissan diesel set up as an idea, but i guess if it was that easy everyone would do the same??

nope wont work nissan sd33 isnt a crossflow engine.

Inst the factory turbo on the gq,s with the td42t a Hitachi ht-16 or 18, and I think they are also used on the series 4-5 mazda rx7s

haydgq wrote:Inst the factory turbo on the gq,s with the td42t a Hitachi ht-16 or 18, and I think they are also used on the series 4-5 mazda rx7s

HT-18 come out on some of the GQ's im told,there are several different sizes and they are quite different spec wise.
I have a HT-18 on mine from a series 5 rx7,the series 3-4 is quite different but still a HT-18(smaller)
I find it goes all rite but there are much better turbos out there(almost 20yrs old in design)

My friend has a A/R .65 exhast with a HT-20 intake which goes pretty good,almost same spec as a TDO5(like some evo's have I think)

Does anyone know if the 1993-on GQ's have a bigger inj pump?N/A models I talking about not turbo's,was told by Nissan mech they do.

Cheers Shane

you can that the ht18 and put the skyline .63 ex housing on it...you have to bore the housing but its basically a t3 super 60 with a smaller shaft and ligher wheels
so its all good
ive made about 5 of these all up over the years

Shane wrote:Does anyone know if the 1993-on GQ's have a bigger inj pump?N/A models I talking about not turbo's,was told by Nissan mech they do.

Cheers Shane

The GQ's (turboed and non) and early GU's have 10mm plunger element, but the later GU's go to 11mm plunger. The plunger size is on the plate on the side of the pump.

Probably cheaper and easier to just get a pump built with the bigger element, like I and others have done.

Some of the Mistrals have 11mm element I'm told.

well as i thought everyone has there own idea on the "IDEAL" turbo but the answers have given me a direction, still thinking of a couple of options but after speaking to someone today with a turboed saf he said that if he did it again he would use the ct26 from a toyota gt4.....same set up as you have mitch.

so then
you have a single entry steel wheel
twin entry cramic
twin entry steel
supra single entry

then you move on the to ct20b's

Mine is a twin entry / 6 bolt housing from Celica GT-4, originally with ceramic exh wheel and shaft. On a trip to Whangamomona, the exh wheel hopped off the shaft and out the end of the exhaust pipe...went to steel wheel and shaft after that. Single entry / 4 bolt housings tend to crack, which I've seen on a CT-26 from 1HD-T, but it didn't seem to effect performance at all.

For simplicity, my money would be on a Mitsi TD05-H 16G or 18G.

Have a talk to Aaron at Rotorua Diesel and Turbochargers. He's getting some animal peformance out of a new turbo setup on his support truck (LWB GQ).....apparently it has it all over his race truck.

its hard to go past a tdo5
one of the best alround turbos made for its size

vvega wrote:its hard to go past a tdo5
one of the best alround turbos made for its size

hey mate ive got an rd28t in my safari with what i believe is a (t25). i am looking at upgrading. i see you mentioned the t28. do you think this would be too large for a 2.8??

Safari Swb wrote:hey mate ive got an rd28t in my safari with what i believe is a (t25). i am looking at upgrading. i see you mentioned the t28. do you think this would be too large for a 2.8??

Yes T28 is too big for a 2.8.
What do you want to upgrade? Your current turbo will be able to put out more boost than it currently is, you don't need to swap turbos to get more power.
A good T25 will deliver more boost than your engine could safely use.

Im also in the same place looking to turbo my safari this year, going to try building manifold myself as a high mount with a tdo5, just wondering whether anyone had any photos of a similar set up and or manifold for me to copy? after manly manifold pics.

Cheers Jared

Found this link for turbo'ing a Nissan L28 gasser engine and was wondering if the same calculation process applied to the RD28 and LD28 range of Nissan diesels... could anyone that knows how to do the numbers comment on this process please?

http://www.mygen.com/users/dbruce/myz31/TurboMaps/L28ET%20Engine%20Air%20Flow%20and%20Turbo%20Compressor%20Maps.htm

I'd be happy if i found a good supra ct26. They always seem to be cheap and also can flow quite a bit of air.

Windsock wrote:Found this link for turbo'ing a Nissan L28 gasser engine and was wondering if the same calculation process applied to the RD28 and LD28 range of Nissan diesels... could anyone that knows how to do the numbers comment on this process please?

http://www.mygen.com/users/dbruce/myz31/TurboMaps/L28ET%20Engine%20Air%20Flow%20and%20Turbo%20Compressor%20Maps.htm

Yes the same process applies, I have a spreadsheet setup with all the variables to calculate airflow for various turbo setups in every common measurement.
PM me your email address if you want a copy.

Turbos off petrol screamers are usually a bad match for diesels. IMO the CT26 is an old turbo with a parts supply that's rapidly drying up. You can't even get compressor maps for the CT26 to know how suitable it is.
Also remember that bigger is not better for a diesel turbo.

flyingbrick wrote:I'd be happy if i found a good supra ct26. They always seem to be cheap and also can flow quite a bit of air.

can probably get you my old gt3076rs for a grand if you want
but then your prolly not hard core enough to use that