Bypass shocks

unbeLEVOble

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We're building a new race frame (Aussie Prolite) and along with that trying to improve a few things with the suspension - particularly the front. The old design runs a single 3" emulsion shock but I would like the tunability of a bypass. Space is limited due to the design of the a-arms, so looking for information on whether a 2.5" IBP will be sufficient, or try and make the room for a coil carrier (2") and external bypass (2.5", 4-tube).
Also, anyone who has knowledge of which IBPs are more suitable - King or Fox (currently leaning towards the King due to the single tube design)
 

Robin Hood

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We're building a new race frame (Aussie Prolite) and along with that trying to improve a few things with the suspension - particularly the front. The old design runs a single 3" emulsion shock but I would like the tunability of a bypass. Space is limited due to the design of the a-arms, so looking for information on whether a 2.5" IBP will be sufficient, or try and make the room for a coil carrier (2") and external bypass (2.5", 4-tube).
Also, anyone who has knowledge of which IBPs are more suitable - King or Fox (currently leaning towards the King due to the single tube design)

A 2.5" King IBP has a 2.5" piston so from a damping standpoint it should be the same IBP or EBP. A Fox2.5" IBP is only a 2" piston.
 

*TRD*

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Either Fox or King 2.5 IBPs will be an improvement over a 3.0 emulsion unless you're on the upper end of the valving.

I need to write all of this out in an article but here's some food for thought:
King IBP's act like a bottoming zone, Fox IBP's act like a 3-Tube bypass with multiple zones.
All IBP shocks have lots of free flowing oil at low speed and need a LOW SPEED adjuster to really tune them.
King offers a Mid Speed Compression Adjuster, Fox offers a DSC High and Low Speed Adjuster.
The adjusters add about 30% more damping area to a 2.0, spread heat out in the shock, and reduce cavitation.

IBP's are great for packaging constraints, but a separate coilover and external bypass will be easier to tune and will perform better.

Here are some articles about the adjusters:
http://accutuneoffroad.com/articles/how-king-compression-adjusters-work/
http://accutuneoffroad.com/articles/how-fox-dsc-dual-speed-compression-adjusters-work/

Here's a general comparison of Fox & King shocks:
http://accutuneoffroad.com/articles/fox-vs-king-2-0-coilover-shock-comparison/
 
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