power upgrade td42T

Hi All

Just wanting to know what can be done to a 2004 4.2 turbo engine to increase power & economy
I know i don't ask for much,

The 3.0lt common rail seems to do ok with a computer upgrade & exhaust!

I assume a 3 inch mandrel bent exhaust will be the first step, I know boosting the Turbo creates power but where do you stop, The vehicle will do the canning stock route one day so it needs to remain reliable

Any suggestions would be fanastic

i put a 3" mandrel bent on my TD42 as well as a few more PSI boost and made a heap of difference to power and better economy..

Thanks for your reply

Do you know how much it was increased by & How?

Regards Glenn

Standard boost is around 7-9Psi, increasing it to its safe maximum of 14Psi is as easy as fitting (and adjusting) a boost bleed valve which costs around $100. Increasing boost on it's own won't give a significant increase in power but it will lower your exhaust gas temperatures which is good for diesels. To get the full benefit from incresed boost the fuel system needs to be tuned to suit, this is something best left to the professionals because if you don't know what you are doing and get it wrong you could do some serious engine damage.

My suggestion would be to fit a 3" mandrel bent exhaust system including dump pipe, and fit boost and pyro gauges at the same time so you can keep an eye on the engine.
After that talk to a few diesel tuners about which chip they recommend and discuss increasing boost for more power.

Tony

swap you my tb42 :-)

Thanks Tony. Sounds like it is relatively easy to pull more power,

Do you know what sort of gain in power & torque to expect with this sort of mod?

The easiest things to do are exhaust and tune with higher boost.
Then the $$$ starts to pile up, the factory intercooler, airbox and turbo are really only good for around 15psi. A new turbo and intercooler running 19-20psi will give you around 140 kw at the wheels (safely) but will cost you around the 4k mark, much better than the 60-70 they come from the factory!
If more power is wanted, the injector pump will then need to be modified costing mega bucks


There are no chips avail for the td42, they dont have efi so it is just not possible. The td42ti models do have an ecu but all it does alter injector timing and may even control the egr valve, but fuelling is still done by the mechanical injector pump. You can prove this by disconnecting the ecu, the engine will still start & run.

I had local workshop put a 3' exhaust, upped boost and increased fuel supply on my GU1V ute. Max power up to 155hp (US dyno) at wheels and unbelievable improvement on driveability and over taking.
Fuel economy virtually unchanged after I got over boy racer with new toy syndrome. Boost gauge shows about 5 lb boost at 100kph and exhaust temp 300 although goes up to 15 lb and 450/ 500 quickly when under load but drops just as quickly when you back off. Most impressed.

GUte,

So if the ECU controls the injection timing on the TD42Ti couldn't you just lengthen the injection time to get more fuel in, like in petrol motors?

Thanks Flex

Welcome to the forum Flex.
It's always nice to post an introduction before asking questions.

The factory ECU (like all factory ECU's petrol or diesel) is not adjustable so you can't just 'adjust' it to add more fuel.
Also, injection timing refers to the start of injection, not injector duration or fuel quantity injected.

Tony