supercharge gq td42

COSTS.

about $10 for supercharging Vs $4 for turbo.

I know you can buy import SC's and do it yourself , but I think you require a fair degree of mechanical knowledge to do it.

Hi Andrew,

No reason, turbos seem to have more exposure to the market.

Have a mate with a TD42 Supercharged. Runs 10 psi and gets about 100kw at the rears. Pushes 36 boggers with no worries.

I ran a TD42 with Schweitzer turbo with 12psi and had 165hp and 124kw at the rears, gives you an idea about turbos and supercharges. Of course had the exhaust, pump mods etc to keep it reliable and pretty economical.

Cheers

Trol.

My guess is first off some TD42s are carby, some are EFI - and carby super/turbo charger kits arent that common.

With EFI kits, you face the same problems as with any engine - is the air flow meter up to the additional airflow, are the injectors big enough and not going to max out constantly, is the ECU reprogrammable or does it require additional mods like a daughterboard to be installed before you can modify it - and is there anyone around with the experience to modify patrol ECUs, will the block/head/radiator be able to handle the extra heat/power/pressure (think of a big 4.2 petrol turbo on a soft beach with the revs up and turbo/supercharger on full boost churning thru the sand - theres going to be a bit more heat over the factory setup there). Is the ignition easily upgradable to suit boost curves (i only really know about coil pack ECU igntion there).

Thats not to say it can't be done - but for the cost of buying a turbocharger / supercharger kit I could see why other options like buying a cheap second-hand holden 5.0L with an adaptor kit might become more attractive. Other things I can think of - a big V8 might be more preferable over a supercharged/turbocharged engine due to its ability to generate so much torque at such low rpm in a fourbie.... insurance reasons too maybe.....

Just my guess anyway. Someone probably does produce a kit out there - have you checked out sites like CAPA to see if they stock one?

Cheers,
Dave.

there are superchargers and then there are .....SUPERCHARGERS. A lot of the later model superchargers are basicly belt driven 'Turbos' where-as Turbos are normally exhaust driven of course.

The really high pressure blowers are positive displacement compressors and have been known to use Vane, roots (2 eliptical egg shaped rotors). The latest use Screw type rotors. Eaton is a good example of a positive type blower.

Note: turbos (and belt driven fans ie Vortech and Powerdyne etc) are not positve displacement and this is main reson for "lag" and "overrun". Some Turbos like to be cooled down after use before being shut down...run on timers.

Because of positive displacement of roots and screw type blowers there is not the "lag and overrun" symptoms. The positve displacement allows for higher pressures at lower revs than equivalent turbo giving increased torque at idle and just above. (turbos have to rev high to get equivalent boost at idle and above. This could be a problem when you want to tread slowly but need grunt.)

Why not used much? Guess it comes down to price...turbos are cheaper i reckon.
believe Mazda use a positive on the Mita and then there is Merc with their "Kompressor"

Try this site for more info and ring them to get full story.
www.capa.com.au

Contact Chris Nash at Nash offroad in Canberra, he has done a few, a mate of mine has a Supercharged GQ 4.2 Diesel. it goes about the same as my TD6 Patrol, but he has had some issues with heat (The charger sits directly over the sterring box and he's had melted seals etc).

cheers,
Daniel