I can't read the numbers in the photo, can you post them up?
How much boost do you want?Thanks, Any sugestions as to what turbo that I should use or what would suit bearing mind that it is a 4HF1- 4.2 ltr. I have had the pump set up to start fueling at 1850 RPM.
To be honest I have no idea about the holsets and their naming system confuses me. Carcrafter is probably your best source of info there.Dougal,
What is the equivelant in the Holset turbos? and I Think most of them come with the
I'd be hesitant about running a turbo as large as the GT3071. One aussie who has put a GT2876R (0.64 A/R turbine housing) on his 4.2 toyota diesel isn't getting 10psi boost until 2300rpm.You might also consider a Garrett GT3071 (can be had with T3 flange) or one of the Mitsubishi TD05 turbos (don't know flange details).
I was talking recently to a Land Rover owner having a problem with the late wastegated Garrett turbo on his 4BD1T. His experience makes me think you need to be careful your turbine and housing are not too small.
He had a compressor failure and the shop he took it to damaged the turbine impeller while repairing it. They could not source a replacement turbine impeller (Garrett make the turbo for Isuzu and don't sell to others). So the shop fitted an impeller from a turbo used in a Nissan engine. The impeller size was close to the original - the housing had to be machined out a little, but it had an extra blade.
Now the engine has more boost at low revs, but chokes at higher revs where boost and performance have suffered. He is not happy with the outcome.
That T3/T4 is much bigger both physically and airflow wise than a GT2860, I don't know exactly how it will compare to the holset.Thanks fellas now I have some thinking to do. I just received the GT25 that is used on the 4HE1 engine but the compressor seems to appear slightly too small for what I would like to achieve.
Idealy it would be great to have max boost at around the 1850 to 2000 RPM range and then I can gear the drive train to maximise the torque produced.I am waiting on another turbo which has these specs
MGP-4003, T3/T4 TOP TURBO WITH INTERNAL WASTEGATE
A/R -T 0.63,
A/R- C 0.6
Flange-T Inlet T3
How would you think this would work
I can get a HE341 or the GT2860 but will these give me the boost at the disired RPM
Or what changes to the compressor and turbine should I do
You need a combination of a turbine that can spin the compressor fast enough at that rpm and a compressor that can deliver boost without surging.Thanks '
So if I want the max boost to occur at around 1850 RPM then the smaller compressor will do it or is it the smaller turbine
This GT2871R has a similar compressor map (where it matters) but smaller turbine:
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).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.
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.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.
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.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.