[bobpr]

Thanks Dougal
I think the max RPM is somewhere about 3400 Rpm
I have established that the GT2256 is used on the 4HG1 and the GT25 on the 4HE1 but the manifold mount is a problem with the GT25.If I could get the GT25 spec with the t3 mount then I may have a show of getting what I need
Bob
I have got an adapter coming from China with the GT2860 but I have to change the angle.

 

[Dougal]

Here's a pic of the 2 piece T3-T25 adapter I've designed up. This picture is Isuzurovers 4BD1 manifold.
He uses a GT2860R on it. It's 24mm thick.

 

[carcrafter22]

I would like to see a compressor of the gt3071 but the wheels look like they would be great but then again wheel size means nothing without a compressor map to see what they do.

For what your wanting to do that gt3071 might be a very good turbo.

 

[bush65]

I would like to see a compressor of the gt3071 but the wheels look like they would be great but then again wheel size means nothing without a compressor map to see what they do.

For what your wanting to do that gt3071 might be a very good turbo.

 

[Dougal]

This GT2871R has a similar compressor map (where it matters) but smaller turbine:
http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT28/GT2871R_780371_2.htm

There are about 5 different GT2871R's, some have wider compressor maps, others steeper.

 

[carcrafter22]

So your gonna see about 40lb/min out of the 3071 if you have enough fuel to spool it. I guess its hard to say without knowing how much fuel there is to spool the turbo. I have never messed with one of the 4h series and they are a very different animal from what I understand.

 

[Dougal]

So your gonna see about 40lb/min out of the 3071 if you have enough fuel to spool it. I guess its hard to say without knowing how much fuel there is to spool the turbo. I have never messed with one of the 4h series and they are a very different animal from what I understand.

100% VE would see about 38 lb/min on a 4.2 at 3400rpm (assuming 20psi boost, 60% compressor efficiency, 60% intercooling, sealevel 20C etc).

 

[bobpr]

That GT3071 has a map which I read as giving you heaps of air and flow at very low engine RPM am I thinking correctly? If so then this may be what I could use and achive my goal .
Early boost at low RPM and the power to maximise the engine torque at close to this RPM .
Although I would imagine that the EGT's would skyrocket if you fueled too much at this point.
Bob

 

[bobpr]

I can get this GT35 For around $US450.00 How do these specs stack up?


MGP-4008 GT35 FLOAT BEARING TURBO Trim-T 84, A/R -T0.63, Trim-C56, A/R- C 0.7, Flange-T InletT3,
Cooling Type water and oil cooling
Bob

 

[Dougal]

That GT3071 has a map which I read as giving you heaps of air and flow at very low engine RPM am I thinking correctly? If so then this may be what I could use and achive my goal .
Early boost at low RPM and the power to maximise the engine torque at close to this RPM .
Although I would imagine that the EGT's would skyrocket if you fueled too much at this point.
Bob

Actually the GT3071 map shows it can't deliver much without surging below 1800rpm on your engine. At 1800rpm it should be able to do 20psi, but not much lower.

The compressor map however is only half the story, the turbine is the rest. It's the turbine which has to spin the compressor fast enough to deliver the low end boost. I don't think a 3071 will do that.
The first two numbers of garretts model code is the turbine size. So a GT2871 and a GT3071 both have a 71mm OD compressor wheel, but the 28 turbine is smaller than the 30 turbine, so it can produce boost sooner.

That GT35 turbo is a T3/T4 hybrid built for ricers. I think they're too big to run as a single turbo in a 4wd truck. 4wd's need low end boost, the heavier they are they more they need.
Carcrafter is running his engine in a light 2wd ute, which has quite different demands on the engine. He can run a bigger turbo without suffering.

 

[bobpr]

Thats what I need Dougal the vehicle is an NPR300 4x4 which will be used in the top end and gulf country of Queensland, So heavy trecking is possible especially when it will be at the upper GVM weights.
which means that I should stick with the GT25 as used on the 4HE1 4.9ltr engine.
Bob

 

[Dougal]

Thats what I need Dougal the vehicle is an NPR300 4x4 which will be used in the top end and gulf country of Queensland, So heavy trecking is possible especially when it will be at the upper GVM weights.
which means that I should stick with the GT25 as used on the 4HE1 4.9ltr engine.
Bob

Can you get the specs from the 4HE1 turbo? Garrett can be pretty flexible with their model names so any chance to pull the covers off and check wheel measurements should be taken. Also housing A/R numbers.

 

[astr]

A little hijack but we here in the US don't have the option of 4x4 from Isuzu. How about posting some photos of the drivetrain for the deprived masses?

 

[bobpr]

Ok AndyI'll see what I can do.
check these out http://www.allterrainwarriors.com.au/index.php?option=com_content&task=view&id=6&Itemid=12
Bob

 

[LeBoy]

The mount is a T3 type I have altered the sizes to larger type

Good day Bob,
I was planning to get a turbo for our 4hf1-2 truck engine, which part of the engine can I get a Oil sent to turbo? Do you have a picture? Thank you

 

[Kiwicamper]

Hi guys
I have this manifold which fits a 4HF/G/E1 engines and I was wondering what turbo to fit to it I can get a GT25 for the 4HE1 but it doesn't have the T3 mount.
The 4HF1 is 4.2 ltr so I need to know what your suggestions may be.
Bob

Hi Bob, I've found this post from a while back.
I'm looking to turbo a 4HF1 too, on a 1994 Isuzu Camper and was wondering what things you've learned from your install/use? Do you know what boost you ended up running, and were there any issues that you could recommend avoiding? Thanks DT