any peformance difference??LANCER wrote on 12/31/69 at 16:00:08:

thumperclone wrote on 08/06/06 at 03:41:31:

The only way any of these gizmos makes a car or bike go faster is due to your lighter wallet.  None of them work at all.  More power and better fuel mileage sell cars and bikes.  If anything like this worked, the manufacturers could make them for a few pennies and put them in every vehicle.

That's not necessarily a convincing argument.  Much effort goes into making the fuel charge uniform.  Modern fuel injected systems seem to do a pretty good job of this.  The induction systems are also pretty long and highly engineered.  

In contrast, the CV type of mixing looks to be quite dirty.  Post-carb intake lengths are rather short and quite simple.  

Different situations.

The DAJ was designed to give you the perfect air fuel mixture. Not too lean and not too fat. Peak horsepower is found in that narrow band of perfect, which conventional jetting rarely gets. Because temperature and humidity and elevation changes constantly your jetting needs will too. Most people will be satisfied with just good enough,but if you want peak performance you might consider adding the DAJ to your carb. For a straight out normal carb  it's safest to jet a little fat so as to avoid excessive heat.
But if you are running the DAJ and your just a little lean, the little induction system will administer an immulsified fuel charge to give you the perfect mixture, where peak horsepower resides.
It is an add only device and will not make it too rich.
Harmonics inside the engine along with pressure drop and air flow excite the mixing valve to draw fuel up from the carb and it's introduced into the carbs throat filling in the gaps in the atomized charge.

This is just whats there on their website for anyone to read.
I have one on my vm carb along with their UFO.

It's important to note that the DAJ will supply up to 10% of your fuel needs so puposfully jetting way lean is asking too much of it. I think maybe 2 jet sizes down from ideal would give you a resonable window for it to work to your advantage.

It does work, but you have to stay within the perameters of the designers.

Seviersavage

voldigicam wrote on 08/19/09 at 07:09:15:

  I had those in my 1980 500 Moto Guzzi,They were called Swral Ups Back then.My brother and I always tried high gear roll on when we changed some thing.He had a full dress harley at the time,We were pretty even from 40-65 mph then he would start pulling a head,With the swral up I would pull him were we were even before.He ordered one for his Harley,mean time we try it to a higher speed and he was pulling me more than he did when I didn't have it in.So is what your are doing is making the intake smaller which make you richer and more torque.His came and he put it in and we were back to even again he gained torque too.His spark plugs were light on one side and dark on the other that did change that they burnt more uniform. So instead of buying one of those just put a sleeve in your intake and you have the same thing