Question: Does a velocity stacK really work?
Looking for feed back from those who have/are using it.
Any different dyno #'s after install...
Thanks,
Mike

 

quick, delete your post, it's a plastic piece worth 50 cents that sells for $40, no proven results

 

It is over way priced. This question has been asked a couple of times in the past too. I have one and I could feel an immediate difference - especially from full stop to around 3500 rpms. I could not believe the difference it made. I would have never guessed. I also came across a vendor that had it for less too so look around, might even find a member that will sell it cheap. I would buy it and if you don’t like it send it back within 30 day and most will give a full refund or credit towards something else they have. Not sure on gains but I sure could feel the difference.

 

Save your money and use it to have Mark Shaner Port & Polish your stock Throttle Body: http://www.s2performance.net/
Excellent results!

 

Of course it works, just not in the way you think it does!
Remember the old Q jet carbs, they had gobs of bottom end because the used tiny primary throttle plates, then when the secondary's opened the engine could breath.
Oops you have no secondary's to open.
So what you do is increase the livelyness at low rpm and lose top end, not what your lookig for. I don't think!

 

No dyno time before or after, but I have one, had one before my shaner ported TB. 10bucks shipped and it is yours. PM me a ship to and it is yours.
Dave
PS trying to clean up my storage area and I have sooo much extra stuff laying around

 

Useless on port injected engines. The manner in which the airflow enters the plenum will have no effect unless it is restricting air flow, or increasing the airflow. Velocity stacks worked well on carburated, and/or mechanical fuel injection engines where the velocity stack provided a longer "tube or column" of air within which the air would be accelerated within a closed column. The effect was to increase the velocity which increased the momentum of the moving air, and it's ability to flow into the combustion chamber with greater velocity, thus decreasing the drag effect on the downward stroke of the piston during the intake cycle since the weight of the moving air carried it into the combustion chamber..
Additionally, in carburated engines, the increased velocity entering the carburator increased the flow of air through the carb and it's venturi, thus increasing air/fuel flow for a given throttle plate angle, and better atomization of the fuel.
This effect also helped mechanical fuel injection such as the old hilborn fuel injection systems. The air was contained within the tall stacks as it was accelerated, and this provided the same benifits as the carbed engines.
Todays port injected engines would not benefit from this because the fuel is atomized as it departs the fuel injector located at the intake port, and the internal runner passageways of the intake are optomized for airflow acceleration enroute to each cylinder head port.
Hope this helped.

 

Thanks for the comments....
Mike

 

ill give you mine if you want to try it

 

I am thinking of a Shaner polished TB
What excellent results did you see with the addition of the TB
John Sr.

 

The Shaner S2 TB will give you improved throttle response, better idle when combined with H/C, better air flow into the intake, and a little more horsepower. Best "bang for the buck"! You can send him your stock TB, or keep it and drop-ship a new TB from Fred Beans. He's provides great customer service and is willing to answer any questions you have.

 

 

I will be dynoing my Vette soon and it is nearly stock, I would consider buying this for $10 just to have dyno proof that it doesn't work.