Thread: Supercharge a 4BD1?

Hi Brian, been through the process of deciding which is best, supercharge or turbo, and turbocharger wins out due to efficiency, simplicity, lack of damage to mechanical driven components due to the 4BD1's torsional vibes, and the fact that it is such a low revving engine it will require a fair bit of gear up to actually produce any useful boost levels. There is also the noise, most belt driven compressors have some pretty average noise when they are spinning up, so will drive you up the wall.

Turbocharging harnesses the waste heat energy of the combustion process, is virtually silent, can provide huge boost levels at reasonably low engine speeds and is quiet in the exhaust and intake departments, except for that very tasty whistle...


JC

Hi justinc,

I appreviate the feedback mate. I can't wait to get my mitts on the right turbo for my old girl and a WTAIC aswell. I too am addicted to that very tasty turbo whistle. Nothing quite beats that on song turbo with a straight through exhaust going up a slight up hill. mmmmmmmmm.

Just thaught I'd throw it out there. There's plenty of argument about the topic elswhere and I thaught I'd throw it in here and see if anyone had heard of this COMPREX being used on any 4 litre engines as I can only find them for 2 litre or bloody 16 litre engines. Theyre an interesting concept. They use very minimal eng power and use the exhaust pulse to compress the intake air. They call it a pressure wave supercharger. Apparently they are very good at eliminating lag but still operate very well like a turbo.

I found it very interesting

I'd forgotten about the Comprex as fitted to sme MX series Mazda etc, Love to see one don't know if they'd be suitable for a big slow revving diesel, (Apparently some people did fit to 2.5 litre 4 cyl diesels too in europe etc) but would be interesting to find out more. Might do some research, thanks Brian!

JC

[ame="http://en.wikipedia.org/wiki/Pressure_wave_supercharger"]Pressure wave supercharger - Wikipedia, the free encyclopedia[/ame]

HYPREX pressure wave charger : swissauto Wenko AG

I have never supercharged a 4BD1 but have played with others... Can be a very frustrating getting them spot on. As JC said, the 4BD1 is a slower revving engine that are gifted for being turboed as low compression for a direct injection diesel.
The supercharger may cause torque impulses at lower RPM that would mince the drive line and the blower drive gear over time.

The set up your looking at would work very well though.... For a wile!

All of us with turbo's have never looked back. They are incredibly reliable, efficient and can make power!

i had a go at supercharging a diesel, theres a thread on here, for the time and effet it took to get 9psi its to easy to turbo it,

Turbo it is then. I have dreamed about turbo's for this green machine for ages and only came across this supercharger today, and got carried away because I had never even concidered the idea.

Who knew there was more than 2 different types of supercharger? You learn something new every day.

I just love finding out about wierd old engine ideas like old 2 stroke DELTIC engines and stuff like that.

Realy interesting.

I'm still waiting patiently to see if this redd system is going to fit under my bonnet, should only be a month or two away now if all goes to plan

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