HFS-4 Q&A, application for your engine...

[Richard L]

Originally Posted by maverick6732

I am going to be setting this up on a 1.9 litre M44 BMW engine with stock internals and compression with a Downing Atlanta Supercharger running approx 10-11Psi Max boost. It will have a custom ECM tune configured to run 93 (USA) octane petrol through a set of 42Lb/hour injectors and flowing through a 3" MAF. The tune will not depend on the water/meth for safety so I can run without the Aquamist running without danger, but I want to add the water/meth to lower operating temps in the supercharger and to add the extra safety factor of increased effective octane of the water/meth. I know there will be a performance increase running the Aquamist as the cooling effect and increased volumetric efficency.

I am curios as to where best place the injectors, I am leaning towards pre-supercharger but wonder if pre throttle body or past is best and if maybe the injector should be placed very close to the supercharger as I can get a nozzle to spray directly at the end of the rotors in this setup. Any suggestions?
I am also curious as to the proper size for the nozzles? The basic system should put out around 210HP at the rear wheel and about 250-270 at the crank and I want to have a system that adds that safety margin and power and also shooting for any possible improvement in fuel economy as well in conjunction with dropping from a 3.46 to a 3.25 rear gear.

Who do I talk to about tanks? I am wanting to get two 4qt tanks with one setup as a surge tank with baffle and the other as the primary, just like Howerton uses in the twin tank system, just without the enclosure as I will be custom building an enclosure and a pump mount to suit my boot.Thanks,
Dave Ellsworth

Now to go and put my name down for the group buy.

Dave,
I suggest running a 1mm nozzle before the SC, allowing some cooling on the S/C running gear, it will help to increase the reduce the hot S/C heating up the incoming air. The consumption may be higher but it is only water.

Tank wise, Jeff is more equipped with this department. All USA GB will be shipped from N.cal, so please contact Jeff for a indepth discussion.