Pretty much any aftermarket SMIM has velocity stacks utilized.

yes they do work however you will see larger results with larger turbo's.

on one of our cusotmers cars, we tuned his car to 490whp on his 2.0 setup. while on the dyno, we swapped in a same 4" turbo intake but with a velocity stack and it jumped to 517whp with no real changes.

on a 16g setup i wouldnt expect to see huge gains but they can improve results.

Are you on about v-stacks on its own or in a manifold? As stacks on there own are only used in N/A motors they do have good effects but not all cars can use them! And the stack inside the manifold from what I've understood as I'm still learning how they work and make them, they are to meter the correct amount of air. To each stack and make a smoother flow! Please someone correct me if I'm wrong as I'm relying on info I've read

is a velocity stack?

Every modern sportbike from my .6 to the big 1.3 and 1.4 liters utilize v stacks. In theory you can focus your powerplant's power profile by adjusting the length of the v stacks. I believe the longer stacks increase the velocity of the charge air (increasing upper rpm power), and shorter stacks increase throttle response and lower end torque. The newer yamaha models use ecu controlled adjustable stacks. The best of both worlds. Neat stuff.

Maverick4g63 said:

Every modern sportbike from my .6 to the big 1.3 and 1.4 liters utilize v stacks. In theory you can focus your powerplant's power profile by adjusting the length of the v stacks. I believe the longer stacks increase the velocity of the charge air (increasing upper rpm power), and shorter stacks increase throttle response and lower end torque. The newer yamaha models use ecu controlled adjustable stacks. The best of both worlds. Neat stuff.

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Yes they do... I bought an R1 back in December and what a ride it. It pulls hard enough from about RPM on up but once it hits round K and the ECU slaps the extension down on the stacks you get a hole other kick in the a$$.. Funny thing is that it is much the same concept as the variable intake design that both Mitsu and Toyota use to use. Difference is that Mistu and Toyota changed to different runners all together while Yamaha just makes the stock ones longer.

Another car I had at one point that had a velocity stack so to speak of was the 2000+ Celica. It had a plastic velocity stack in the air box right in front of the MAF sensor. It was held in by a small plastic tab and it broke on my one day allowing the stack to drop down into the air box and cause turbulence across the MAF so I pulled it out and believe it or not actually made the car run worse than with it loose. Made me wounder if you could tune the car by adjusting the length and size of the stack in the air box, but unfortunately it was a project I never got around to messing with.

So yes velocity stacks can make a difference.

bud92gsx said:

is a velocity stack?

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"Real" velocity stacks:

Yup, they work to some extent. Don't expect the World from them though.
They're especially popular on individual throttle body setups and inside of intake manifold plenums.

Also, I know Joe Bucci properly added one to his 14b setup and picked up a couple MPH in the 1/4.

calan said:

"Real" velocity stacks:

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Click to expand...

Would that be a Sunbeam Tiger?

Velocity Stacks, I have seen them on NoN- street turbo applications.
I do run stacks on my weber 48 IDA's, with filter screen ofcourse. (2332 cc VW stroker) 1960 beetle.

4g63tc said:

Would that be a Sunbeam Tiger?

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That it would.

Bob Hokanson's 322cid Ford V8 Powered 1965 Sunbeam Tiger

So where wwould I use it on a almost stock system?

you wouldn't

silicosys4 said:

you wouldn't

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I always wanted a Jensen Heely

^+1 How are they used on our cars. Besides the intake manifold, how can a relativly stock car have a velocity stack on it? Does anyone have a picture of Joe Bucci's 14b car with it?

ChiTownHussla said:

So where wwould I use it on a almost stock system?

Click to expand...

You would use it with proper air filter (6" opening)...
BPI Performance Velocity Stacks

a velocity stack is a " wringing every last bit of power available out of an engine once other areas of flow restriction have been addressed" type of thing
They go at the entrance of air intakes, and act to reduce and tune turbulence of incoming air. They don't actively increase the amount of air going into the intake, per say, but they do act to smooth the airflow, allowing for greater amounts of air at less resistance to pass through it. There are so many other areas of flow restriction to be addressed in a stock engine that should come first, particularly a turbocharged stock engine, that would yield much better results for time/effort spent, before thinking about what a velocity stack could do for you.
On a stock intake, you'd have to first remove the maf, and plumb for speed density. Otherwise you are going to be adding the stack for nothing. Then slap that trumpet on the intake of the turbo, no screen cause they are for posers and go to town.

ChiTownHussla said:

So where wwould I use it on a almost stock system?

Click to expand...

Mitsubishi dont push there engines enough to need stacks. Having 4 individual throttle bodies is just asking for boost leaks.

I love this setup though

TJCTalon said:

Does anyone have a picture of Joe Bucci's 14b car with it?

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mike96 said:

Yes they do... I bought an R1 back in December and what a ride it. It pulls hard enough from about RPM on up but once it hits round K and the ECU slaps the extension down on the stacks you get a hole other kick in the a$$.. Funny thing is that it is much the same concept as the variable intake design that both Mitsu and Toyota use to use. Difference is that Mistu and Toyota changed to different runners all together while Yamaha just makes the stock ones longer.

Another car I had at one point that had a velocity stack so to speak of was the 2000+ Celica. It had a plastic velocity stack in the air box right in front of the MAF sensor. It was held in by a small plastic tab and it broke on my one day allowing the stack to drop down into the air box and cause turbulence across the MAF so I pulled it out and believe it or not actually made the car run worse than with it loose. Made me wounder if you could tune the car by adjusting the length and size of the stack in the air box, but unfortunately it was a project I never got around to messing with.

So yes velocity stacks can make a difference.

Click to expand...

The variable velocity stacks on the R1 are great until you have to change spark plugs... You have to go through the radiator!

Here's one I started for my 14b car about 4 years ago. I never did finish it before I scrapped the project though. Pretty much just like Joe's, but mounted a bit higher up, where the headlight once was.

Everything old is new again. The concept still works even after all of the technology advancements of the last half century.


See Review: We Were The Ramchargers for the people who pioneered this concept.

Running its first few races as The Ram Rod, the car was eventually renamed as The High & Mighty after a John Wayne movie. The name also evoked the nearly 6-foot-high reach of the car's dual 4-barrel carburetors — above the level of the roof on an elongated "ram" tubes.

The car first raced at the National Hot Rod Association Nationals on Labor Day, 1959, where it clocked an E.T. of 14.41 at 103.24 mph in its best run of four passes for the day.

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Ah yes I remember it well. That was the year I graduated from high school and build my own hot rod.

Droptop Spyda said:

The variable velocity stacks on the R1 are great until you have to change spark plugs... You have to go through the radiator!

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Yea I don't plan on doing that job myself, that may be one of the few things
I pay the stealership for... As it sits right now I may not have the bike long enough to do it myself anyway..

<-- have a velocity stack feeding a sealed air box