Turbo question for the 4BD1 experts

[County3.9]

1. Does the bonnet need to be modified to clear the turbo-inlet manifold pipe?
2. I know this one will re-ignite some opinions:p...Have we decided if it's a good idea to turbo a NA isuzu yet?
3. Has anyone managed to fit a denco(sp?) liquid to air intercooler into the 110 engine bay. Looks like a compact unit.

I know KLR have done a few turbo conversions to the 4BD1. Has anyone got photos of their work?

[Blknight.aus]

1. no but that depends on your plumbing
2. yes it is depending on how nuts you got
3. no idea. but Ive seen air to coolant intercoolers on them before just not sure of breed.

[rar110]

1. As Dave said it depends on your set up. The bonnet frame is normally the problem. I have a cross over pipe that sits flat to avoid the bonnet frame. However, in my case the turbo compressor was too big so I had to rotate it to face down. In the end the intake pipe went around the back of the motor under the air cleaner. I could have used the cross over pipe if I had used a T25 with a smaller compressor housing.

2. There are significant differences between the turbo and na motor. However, turboing a na makes a big improvement to a na motor. At 100km/h according to the before & after dyno my set up achieved over 50% increase in hp and torque.

3. dont know about this.

[4bd1discovery]

1. Does the bonnet need to be modified to clear the turbo-inlet manifold pipe?
2. I know this one will re-ignite some opinions:p...Have we decided if it's a good idea to turbo a NA isuzu yet?
3. Has anyone managed to fit a denco(sp?) liquid to air intercooler into the 110 engine bay. Looks like a compact unit.

I know KLR have done a few turbo conversions to the 4BD1. Has anyone got photos of their work?

1: yes the bonnet has to be modified for the cross over pipe.

2: yes it doesnt matter it will easily handle it.

3: KLR hasnt but you could.

KLR is the best place go there and get everything you need done!!!

[OLR-067]

Just further to Q2....at how many Km's wouldn't you turbo a NA...that is given regular servicing and a good condition base...mine has 420k...not thinking about a turbo...but hand to know.

paul

[isuzurover]

A good 4BD1 can easily do 500k - 1 mil km in a truck. As long as the engine isn't using oil, doesn't have excessive blowby, and seems to be in good general condition, I wouldn't have any problems with turbocharging, however many km it had done.

[justinc]

My 4BD1 was turboed at about 460K. It has now done 500K and is in the same condition as pre turbo days. I have early on pushed heaps of fuel and Hi gas temps through it to try it out:twisted:, then I woke up to myself and after trashing 3 auto boxes and wearing out 1 LT95 transfer case, calmed down a little. I have no reservations turboing a NA version of this engine, just be sure you have a good example, IE serviced regularly, before you begin. I expect my engine and trans will outlast the 1992 RR body shell.

I'm using an front mounted Air to air I/C, but a water to air one is far more efficient.(up to 4 times the heat transfer)

enjoy, I am constantly enjoying driving mine...:twisted:

JC

[def-90]

if you want o do it properly get the fuel pump rebuilt to turbo spec!!!

then you know you are getting correct fuelling instead of guessing by manually tuening your fuel screw

[rijidij]

1: Yes the bonnet has to be modified for the cross over pipe, but if you decide to fit an intercooler in front of the radiator you can do away with the cross over pipe alltogether.
https://www.aulro.com/afvb/images/imported/2009/02/1368.jpg

2: Yes, it doesnt matter, it will easily handle it. Even the N/A 4BD1 was designed to lugg around tons of stuff in a truck all day, every day.

[County3.9]

What is the recomended turbo and manifold? From what I've been reading the garrett seems the most popular choice.

[Dougal]

if you want o do it properly get the fuel pump rebuilt to turbo spec!!!

then you know you are getting correct fuelling instead of guessing by manually tuening your fuel screw

The fuel pump itself (bosch/Zexel/Kiki Type A) appears the same on both turbo and non turbo engines. The governor differs in that some turbo ones are fitted with the aneroid (controls smoke off-boost) and they probably have a different torque plate.
The main difference is where the max fuel screw is set, an EGT gauge is a necessary part of any diesel turbo install.

Regarding turbo and manifold choice, it all depends how good you are at fabrication.
If you aren't, then a factory manifold with either a T3 turbo from something like a nissan RB20 or the non-wastegated factory T25 would be the easiest solution.
If you can make your own manifolds then there's no end of options. Do you like low end torque or high end power more?

[Larns]

Bump.....................

I'm getting a little more interested in how to select a turbo.

What do some of the figures mean? I am looking at matching a turbo to suite my driving style not vicy vurka.

:twobeers:

[Dougal]

Bump.....................

I'm getting a little more interested in how to select a turbo.

What do some of the figures mean? I am looking at matching a turbo to suite my driving style not vicy vurka.

:twobeers:

Do you want more low to mid range or more mid to high end?
There are a whole slew of turbos that'll work, it all depends on what you want.

[Larns]

I really am after something that will start to spool up early and hold good boost (15psi), ie. low end start around the 1000-1200 and be safe up to around the 2800. I rarely ever get it above the 25-2600 mark unless I'm towing a big boat up a large ramp/slope.
I was looking at the T25 like you suggested Doug's but there appear to be so many varients with the inlet and outlet wheel/housing's and blade pitches and such.
If I knew what numbers I was looking for it'd narrow down the chances of buying the wrong unit. Oh I can fabricate pretty much anything in my workshop so making a manifold to fit would not be a problem if there was an ideal turbo but wouldn't fit a standard T3 configuration.

Heres one for you, the new 2.5ltr common rail hiluxes have a variable vain turbo, how would one of those hold up you reckon, maybe off a wreck I could get one for a half decent price.

Cheers

[Dougal]

I really am after something that will start to spool up early and hold good boost (15psi), ie. low end start around the 1000-1200 and be safe up to around the 2800. I rarely ever get it above the 25-2600 mark unless I'm towing a big boat up a large ramp/slope.
I was looking at the T25 like you suggested Doug's but there appear to be so many varients with the inlet and outlet wheel/housing's and blade pitches and such.
If I knew what numbers I was looking for it'd narrow down the chances of buying the wrong unit. Oh I can fabricate pretty much anything in my workshop so making a manifold to fit would not be a problem if there was an ideal turbo but wouldn't fit a standard T3 configuration.

Heres one for you, the new 2.5ltr common rail hiluxes have a variable vain turbo, how would one of those hold up you reckon, maybe off a wreck I could get one for a half decent price.

Cheers

The T25 I'm using will fit the bill. Mine is from a nissan bluebird with the CA18DET engine. A/R of 0.49 on the exhaust side is what you're looking for.
If you want to spring for a new garrett, the GT2052 is roughly the new replacement for that.

Regarding variable vane, I'll let you know when I get mine working. I have a turbo from a mercedes 2.7L V6 diesel. Got to get some tricky internal machining done so I can rotate the parts around to the required angle. Controlling some of the new variable vane turbos will require some electrical work, the slightly older ones use a pressure or vacuum air actuator.

[Larns]

Q for Doug's there is a Garrett advertised with this description "TURBO HAS FRONT COM COVER A/R.60 - M24 AND A/R.49 - M3 INTERNAL WASTGATE TURBINE HOUSING."

E-Bay obviously, is the comp housing too big?

There is another advertised as being an M24 with a A/R of 42? Too small?

:twobeers:

[Dougal]

Q for Doug's there is a Garrett advertised with this description "TURBO HAS FRONT COM COVER A/R.60 - M24 AND A/R.49 - M3 INTERNAL WASTGATE TURBINE HOUSING."

E-Bay obviously, is the comp housing too big?

There is another advertised as being an M24 with a A/R of 42? Too small?

:twobeers:

Got a link to the ad?

[isuzurover]

This one? Nissan garrett turbo from R32 GTR T28 CA18det - eBay Turbos, Superchargers, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 12-Jun-08 20:04:20 AEST) (http://cgi.ebay.com.au/Nissan-garrett-turbo-from-R32-GTR-T28-CA18det_W0QQitemZ160248617738QQihZ006QQcategoryZ72 478QQcmdZViewItem)

M24 doesn't mean much...
http://cgi.ebay.com.au/Nissan-garrett-turbo-from-R32-GTR-T28-CA18det_W0QQitemZ160248617738QQihZ006QQcategoryZ72 478QQcmdZViewItem


Another
http://cgi.ebay.com.au/GARRETT-TURBO-T25-NISSAN-SKYLINE-R32-180SX-CA18DET_W0QQitemZ250258279617QQihZ015QQcategoryZ72 478QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


This looks like a good buy:
http://cgi.ebay.com.au/Garrett-T25-Turbo-Fully-reconditioned_W0QQitemZ320261866571QQihZ011QQcateg oryZ72478QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

And this one?
http://cgi.ebay.com.au/GENUINE-GARRETT-T25-T28_W0QQitemZ170227476842QQihZ007QQcategoryZ130654 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

[Dougal]

This one? Nissan garrett turbo from R32 GTR T28 CA18det - eBay Turbos, Superchargers, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 12-Jun-08 20:04:20 AEST) (http://cgi.ebay.com.au/Nissan-garrett-turbo-from-R32-GTR-T28-CA18det_W0QQitemZ160248617738QQihZ006QQcategoryZ72 478QQcmdZViewItem)


I have one of those, it's the intended "large" turbo in my compound setup. It's a T28 with a 0.64 A/R turbine side. Still usable but it's going to give more top and and not much down low.
2mm of shaft play sounds poked.

The next two below are the same thing.


M24 doesn't mean much...
Nissan garrett turbo from R32 GTR T28 CA18det - eBay Turbos, Superchargers, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 12-Jun-08 20:04:20 AEST) (http://cgi.ebay.com.au/Nissan-garrett-turbo-from-R32-GTR-T28-CA18det_W0QQitemZ160248617738QQihZ006QQcategoryZ72 478QQcmdZViewItem)

Another
GARRETT TURBO T25 - NISSAN SKYLINE R32,180SX,CA18DET - eBay Turbos, Superchargers, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 22-Jun-08 11:32:40 AEST) (http://cgi.ebay.com.au/GARRETT-TURBO-T25-NISSAN-SKYLINE-R32-180SX-CA18DET_W0QQitemZ250258279617QQihZ015QQcategoryZ72 478QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)



This one is exactly the T25 that I have. I had to modify the wastegate bracket and I also modified the arm to let me adjust the boost.
The "high flowed" comment makes me nervous though, they could have done any number of things to it, several of which aren't good for diesels.


This looks like a good buy:
Garrett T25 Turbo - Fully reconditioned - eBay Turbos, Superchargers, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 15-Jun-08 17:00:58 AEST) (http://cgi.ebay.com.au/Garrett-T25-Turbo-Fully-reconditioned_W0QQitemZ320261866571QQihZ011QQcateg oryZ72478QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)


This last one is a hybrid, T28 compressor with a small T25 turbine housing. It could work very well or it could be a dog. Who wants to buy it and find out?


And this one?
GENUINE GARRETT T25/T28 - eBay Turbo Parts, Performance Parts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 19-Jun-08 17:40:00 AEST) (http://cgi.ebay.com.au/GENUINE-GARRETT-T25-T28_W0QQitemZ170227476842QQihZ007QQcategoryZ130654 QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)

[Larns]

This last one is a hybrid, T28 compressor with a small T25 turbine housing. It could work very well or it could be a dog. Who wants to buy it and find out?


I will if I can get it for a hundred bucks! Otherwise I'll keep hunting for a normal T25.

Cheers