Thread: Supercharge a TD5?

you'd better off wacking in a VNT turbo on a TD5 and Chipping it

see Tombie2 , He..Da..man

and while you're at it get a with Bigger fridge.

Love super chargers. But they are not as simple as one would think and I could almost guarantee that it would work out much more expensive than just grabbing a stock manifold and after market turbo, plus Tomibes magic.

Although a super charger is much more efficient than a turbo ( assuming roots type) its efficiency that becomes a problem.

Now remember that a super charger is a positive displacement, unlike a turbo it will push air against anything. Off throttle you will have the same boost as if you were on throttle. if your super charger is set up for 10psi you will ( closely) have 10 psi all the way though the rev range, that will mean heaps of grunt low down, it also means that it may be a bit hard on the clutch etc. tubos have the advantage of having to spool up in this respect.
Off throttle a turbo will spool down quickly but a super charger will not, trailing throttle at 10psi wow who need brakes but maybe a new gearbox.

Next problem is most automotive super chargers are for petrol motors so they are really designed for lower boost, say 6psi tops. This is not good for a diesel so some modifications will be needed, things like pressurizing behind the seals. Drilling taping and a regulator. (this stops the seals blowing) if you wish to run higher pressures

A bypass can be made up to waste boost when off throttle and on idle.

Then we come to fueling, personally with a TD5 i would have no idea where to start.

You will probably be told that a super takes power from the crank where a turbo only uses waste energy, well this is true but it’s very misleading, a super charger may take for a TD5 10psi maybe 5hp, but I can guarantee you that by bolting on a turbo you will lose more than that 5psi just in the interference and poor exorst flow. The upside is that since a turbo has to over come its own back pressure a super charger will not have this problem and will benefit more from a free flowing manifold etc. the end result is more power for less pressure IE say 10 psi supper charged = 14 psi turbo charged. In addition the heat generated by a super charger is much less than that of a turbo.

Thanks for the info.
I may still do something with a blower when I have nothing esle to do with my time and can't find anything else to spend my gazillions on.

Cheers
Dennis

Supercharged diesels were common years ago. The Allis Chalmers 45 motor grader is one that comes to mind. It had a Buda diesel engine with a Roots type blower in a very tidy and well designed installation. You do need to determine the volume of air delivered per revolution of the blower. To achieve 15 psi boost over atmospheric you need to supply twice the engines swept capacity of air for every two engine revolutions. You can calculate the necessary blower drive ratio and thus pulley sizes once you know the blower's delivery and the boost pressure you are seeking.

Even on a defender it would be an engineering nightmare just trying to fit the drive into a useful position.

Everything can be done, but I think this one would be massive fabrication for very little (if any) benefit.

But I like how your brain thinks....

You could also look at a compounded turbo...

Originally Posted by Tombie2

Even on a defender it would be an engineering nightmare just trying to fit the drive into a useful position.

Everything can be done, but I think this one would be massive fabrication for very little (if any) benefit.

But I like how your brain thinks....

The idea is good and would certainly work well. You would have to do a certain amount of development and tuning as is usual with supercharger installations. Use a pyrometer to help adjust the fuel delivery and maybe have to change drive pulleys to get the boost you need.

Fitting it under the bonnet of an already cramped area might be a challenge.

do it,,, make a kit and il buy it