Thread: Latest turbo upgrade info for 300Tdi

Originally Posted by Michele

Very same kit originally developed (ask me how I know) and supplied by MDE (also in UK)...I and Jock The Rock here have one under the bonnet.
I'd like to know if there's any subtle difference and where...

So Michele...... how do you know ?

Comparing to the photo on their site, the "new" kit has the compressor inlet at the rear and the exhaust exiting from the front (as with the standard T250-04), and the one I am supposedly getting is orientated the other way around. Have said all of this, Jock's is the same as the photo they emailed me, so .....

Thanks for refreshing my memory Jock. I lusted after your set up many moons ago.


James.

Originally Posted by rainman

So Michele...... how do you know ?

Comparing to the photo on their site, the "new" kit has the compressor inlet at the rear and the exhaust exiting from the front (as with the standard T250-04)

LOL,
when I came across Tato's post I started toying with the idea of fitting a VNT (it was 2008!) I firstly contacted MDE to get a better idea of the Powerstroke parts I could have used.
Then I bought the manifold, then I was given a list of bits and bolts, then after a few more mails they came up with a complete bolt-on kit

I guess having the inlet/outlet in stock position allows minimal or not exaust surgery at all, so less parts and cheaper price?
If so it could be a much easier choice...

I'd like to have a closer look...

Has anyone had any experience with "hybrid turbos" as per the thread below. Looks like they modify the turbo with a larger compressor wheel. The guy says he gets much better low RPM response. Would this be then lacking at high RPM?

Land Rover Forum in Africa • View topic - 300Tdi Hybrid Turbo - Is it worth the effort?

Turbo technics in the UK list them for around 500pounds. I assume with these ones you would still need a 200tdi manifold?

Would this be a better (much cheaper) option to a VNT, and have less moving parts to go wrong?

Alan

Originally Posted by danialan

Has anyone had any experience with "hybrid turbos" as per the thread below. Looks like they modify the turbo with a larger compressor wheel. The guy says he gets much better low RPM response. Would this be then lacking at high RPM?

Land Rover Forum in Africa • View topic - 300Tdi Hybrid Turbo - Is it worth the effort?

Turbo technics in the UK list them for around 500pounds. I assume with these ones you would still need a 200tdi manifold?

Would this be a better (much cheaper) option to a VNT, and have less moving parts to go wrong?

Alan

I don't have personal experience with a hybrid turbo for a 300Tdi, but know someone I gave a stock 300Tdi turbo to, which he had a higher flow compressor added.

If you want to run boost pressure much over about 18 psi, the stock compressor is out of it's efficiency range, which a larger wheel will address.

Because the turbine housing is part of the manifold, a hybrid turbo saves procuring a new manifold and turbo.

However, a larger wheel, or even a larger inducer (higher flow), will require more torque from the turbine to spin it at the same turbo speed, so on paper this normally wouldn't be a solution for better low RPM response, unless the wheel is a much better design, which is possible. There are 2 issues here: larger wheel usually means larger mass moment of inertia, thus needing more torque to accelerate (increase rpm), and compressing more air at same speed needs more input torque.

Originally Posted by danialan

Has anyone had any experience with "hybrid turbos" as per the thread below. Looks like they modify the turbo with a larger compressor wheel. The guy says he gets much better low RPM response. Would this be then lacking at high RPM?

Land Rover Forum in Africa • View topic - 300Tdi Hybrid Turbo - Is it worth the effort?

Turbo technics in the UK list them for around 500pounds. I assume with these ones you would still need a 200tdi manifold?

Would this be a better (much cheaper) option to a VNT, and have less moving parts to go wrong?

Alan

Not on the 300tdi, but I have some experience mixing and matching turbocharger parts on my Isuzu.
A larger diameter compressor wheel does bring on boost sooner in the rpm, this is because it reaches a higher tip speed for the same shaft speed. However the bigger wheel is slower to accelerate. The bigger wheel also results in the turbine turning slower which appears to reduce the mass flow the turbine can pass for any given drive-pressure.

But the link you have posted above seems to run a wheel of the same diameter but bigger inducer (bigger trim). I wouldn't expect this to make a huge difference until you are approaching the flow limits of the existing compressor. The massive increases in fuel economy the owner is reporting aren't something I would expect to follow a change in turbo compressor wheel.

So basically, bigger compressor wheel than turbine wheel biases a turbocharger more towards low engine speed operation.

What might seem trivial on the link is that he has a 1. better intercooler 2. the exhaust manifold and turbine housing have ceramic coatings that work better then exhaust wrap. 3. the pump was cranked up.

my dream machine ball bearing turbo. housing and manifold treated
ported head with it being worked over by swan tech ceramics in sydney
pistons treated and lpg. at the moment i have a good exhaust (2 through mufflers) allisport intercooler. getting 9.3 to 10.5 l/100km
auto.

Originally Posted by Pedro

What might seem trivial on the link is that he has a 1. better intercooler 2. the exhaust manifold and turbine housing have ceramic coatings that work better then exhaust wrap. 3. the pump was cranked up.

my dream machine ball bearing turbo. housing and manifold treated
ported head with it being worked over by swan tech ceramics in sydney
pistons treated and lpg. at the moment i have a good exhaust (2 through mufflers) allisport intercooler. getting 9.3 to 10.5 l/100km
auto.

I have an allard kit fitted to my 300 tdi disco I am VERY pleased with the performance, boost peaks at about 20psi and power is available from tickover upwards, engine is much smoother and drivability is like a modern car

best
Dave

Hi all,
Just a quick update...been a while I know...but ended up with an Allisport VNT turbo, upgraded intercooler, tweaked pump and complete rebuild and balanced motor. Turbo around $2300 with all import costs etc. Rebuild around $2000 for parts and machining, labour all myself over several months. Was rather disappointing at first until contacting Allisport for pump mod (they knew my setup with new intercooler so don't know why they didn't send the info up front, anyhow after several emails got it sorted). Felt under fuelled until pump mod was done then went much better and is getting better as the motor runs in. Interestingly it runs much higher boost right from off idle. At 100kph on flat running she pulls 0.9 bar constant but economy hasn't altered and is getting better as the motor runs in (only about 5000k yet). But put the foot down and boost builds straight away and goes to 1.25 bar and she urges away.
So generally very pleased. Next will be a performance head from Turner Engineering as noticed hairline cracks between a couple of valves during rebuild but figured would go a little more as funds and time did not allow at the moment. Will get to it in the next twelve months (she doesn't do as many kays these days but has a second life at 450 thousand).
I was concerned about the boost increase as to whether that might be too much but on reading several other threads seems is OK for up to about 1.35 bar (19 psi).