They say that each engine has a sweet spot with HHO. It is not neccessarily more equals better

How do you find the sweet spot ??

I have a turbo diesel Mitsubishi (3200cc) and with the introduction of HHO (1.5 l per min) it appears that my EGT guage is showing higher temp than previuosly and the motor feels as if it is being retarded a little

Now they are introducing LPG into diesels for more power and some fuel gains. The LPG tank is around 1/3 the size of the diesel fuel tank.

Does any one know what the ratio of intoduced LPG would be as compared to HHO? What would this equate to in litre per min of HHO?

Also the retarding effect on the motor:: could it be the compression is causing detonation before introduction of fuel ???

Not being a mechanic any info would be of help