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Velocity stacks – 20V 4age Blacktop throttles

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$200.00$290.00

SKU: -VS-BT Categories: , , , ,

Description

Velocity stacks to suit 20V 4age Blacktop throttles – Set of 4

Individually machined from a solid round bar these velocity stacks have been carefully designed and tested resulting in a product that not only works excellent but also has the looks to match. Unlike other cheap alternative offerings there aren’t any low quality compromises to save costs such as mismatched “20V universal” types, thin flanges, using slots for the mounting or using something such as an unreliable join to a separate flange.

 

Lengths / Types available

Normally we offer these different velocity stack lengths:

– 30mm

– 50mm

– Custom 50mm to suit the OEM Airbox (more info further down)

– (70mm) X: Discontinued

– 100mm

– 100mm Bead blasted: Available only as a limited batch these velocity stacks have been bead blasted giving them a very fine satin textured finish. Note: These may have subtle blemishes in the finish. An example of these can be seen in the product pictures.

However some of these may not be visible from the drop down menu if they are out of stock at the time. If so then feel free to contact us to check on when these are due to be made available once again.

 

Design features and advantages

– Machined out of a single solid billet aluminium bar

– Full radius bell-mouth

– Long internal taper down before merging straight just before the flange

– Internal diameter ideal size for throttle opening: no nasty steps.

– Positively located: no adjustment available or needed. Other than the BT-30s each flange uses a 270 degree locating arc instead of a slot.

– Different Blacktop and Silvertop versions, the shape and taper was optimised for each

– Parabolic / Exponential curve inlet transition

– Designed and machined in Australia

– Optional fit and an upgrade for inside the OEM Blacktop airbox

– No nonsense semi-polished finish

 

Development

When the new billet velocity stacks where being designed, they where made from the beginning to be the best there is. These shown here are the result of research, prototype works, testing and then finally CNC machining of the final product. The result of this development was used to update the 100mm rolled type.

The shape of the bellmouth, inlet transition and taper where all optimised to allow for the highest net airspeed possible. During development multiple prototypes where made and put on the flow bench, even the rough test version was able to outflow HRC, IMEC and by a massive 55% the original rubber OEM stacks.

 

Parts compatibility

These velocity stacks have not been compromised in their design to make them a universal design for the different throttle types. So therefore these will only fit up and match internally with those from 20V Blacktop throttle bodies.

A way to double check the type of throttles that are fitted to the engine can be done by measuring between the M8 mounting holes on the top throttle body face where the velocity stacks are normally mounted. There are as follows:

– Silvertop 20V (Gen1+2): 73mm center to center

– Blacktop 20V: 83mm center to center

 

BT-50: Upgrade for inside the original factory airbox

– The 50mm long velocity stacks have a selectable “OEM airbox” modification. This lets them directly replace and upgrade the original rubber molded velocity stacks without having to undertake any custom work or other changes to the original unaltered Blacktop airbox. The customer feedback of doing this upgrade has been overwhelmingly positive- real power gains that can be felt without any downsides other than an increase in the induction noise. For anyone still using an OEM airbox this is simply the single best “bang for buck” modification for a 20V Blacktop, furthermore this upgrade isn’t time consuming nor difficult and requires only minimal tools and skill to undertake.

 

BT-30: Installation into an aftermarket airbox

– Re-released after many years our 30mm long velocity stacks were designed to suit two of the aftermarket Japanese airboxes- these are from Noby-Booth and Mekaru. These stacks are an ideal length to allow for a sufficient bellmouth to airbox lid clearance. To facilitate mounting these feature slots in the base flange to allow the bolts to be able to clear the bellmouth and slide into place. Secondly small notches were custom machined out of bellmouth directly above each of the bolt heads for the tool access. Due to both of these features a conventional set of Allen keys is all that’s needed to tension the bolts up.

NOTE 1: Suitable bolts and washers are supplied with every set of these BT-30 velocity stacks.

NOTE 2: Both of these Japanese airboxes are sold in a form that they don’t have the holes drilled for the main throttle openings or mounting. As such while normally these BT-30 velocity stacks can be fitted without any modifications this is only if the airbox hasn’t had the mounting holes drilled too far to the left or right. Alternatively the edge of one of the bellmouths might need to be shaved to fit.

 

Installation notes

– Washers should be fitted between the bolt heads and the mounting flanges

– The correct size of the mounting bolts is M8 x 25mm – though a 20mm length is sufficient if the stacks are directly bolted to the throttles without an intake plate / airbox in between. WARNING: Fitting bolts that are too long may hit and bottom out against  part of the throttle casting which could cause the throttle housing to snap.

 

 

Additional information

Weight N/A
Dimensions 20 × 18 × 12 cm
Length

30mm, 50mm, 50mm – OEM Airbox Mod, 70mm, 100mm, 100mm bead blasted

2 reviews for Velocity stacks – 20V 4age Blacktop throttles

  1. Braden (verified owner)

    Brilliant product

    After searching high and low for a reasonable looking alternative. I bought a set of these, in the 100mm length, for my otherwise stock blacktop… And they’re an amazing feel, nice to drive, and such a brilliant sound. Would recommend these in a heartbeat to anyone needing some new Trumpets

  2. Nicko (verified owner)

    Brilliant design and build quality!

    Bought a set of the 100mm stacks for my blacktop, arrived yesterday and I was very impressed with just how good they are! Build quality is excellent, design is great and the present really well! Are also quite light for what they are. Fit perfectly and easy install, and make one hell of an intake noise! Would highly recommend over any other stacks! SQ doesn’t skimp out on quality.

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