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Discussion Starter · #1 ·
I have a T1R header on the way and I want to protect my investment as much as possible.


There are actually five mounts on the K20Z3 motor. As defined in the shop manual, the Civic Si has three "motor mounts" and two "torque rods" the top dogbone and lower rear dogbone.

For the three motor mounts, the primary function of two of them (the ones on the driver and passenger sides) are meant to support the weight of the engine and transmission. The third motor mount on the front mid section of the engine does not carry the weight of the engine or transmission since it is mainly used to keep those parts tilted to the proper angle when everything is assembled.

The primary function the two torque rods is to limit the twisting of the engine when under load (that is why there is one at the top high point and another on the bottom low point).



Innovative uses two mounts to support the weight of the engine and transmission. The third mount it replaces is not in a location that can effectively limit the engine's twisting motion under load. So how do their three motor mount replacements limit the engine from twisting under load? By using beefy brackets and very small polyurethane bushings that are extremely stiff.


Boomba Motor Mounts are direct replacement of the factory top dog bone mount, bottom dog bone mount and front mount that use the same hardware. They actually replace the mounts responsible for tortional twisting of the engine in the vehicles chassis. All of which leads to the damage of expensive headers, flex pipes, and flanges. Plus they are cheaper.

1. Which brand of engine mounts will protect a header the best from hitting the firewall, hitting the subframe, damaging flex pipes, and has the best overall drivability with the least vibrations transferred to the chassis?
Also are there any drawbacks/quality issues to any brand that anyone has experienced such as bad ride quality, or any related/exhaust system damage from launching or tracking your car?



It seems my nod goes to Boomba, for the price and the mounts they replace, but so many people run Innovative, so I want to know the advantages or disadvantages if any of these mounts for a naturally aspirated daily driver currently with 197 whp and 147 tq. After I get re-tuned I'm looking to track it this year, so tortional twisting will be an issue.





2010 Si coupe : 17x7.5 Buddy Club F91's, 225/45 Azenis 615k's, Buddy Club Pro Spec Exhaust, Project Kics lugs, Spoon Magnetic Drain Plug Set, Pulstar Iridium Plugs, Flashpro, Takeda Attack CAI, Karcepts TB spacer, P2R thermal gaskets, Hondata Heatshield, TWM Short Shift Kit & Base Bushings, Napa #7777 radiator hose, Hybrid Racing Shifter Bushings, Buddy Club Type A Shift Knob, Weapon R Angled O2 Sensor CEL Eliminator (To be installed), Buddy Club Header Thermo Wrap (To be installed), T1R Power Header ( En route).
 

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Discussion Starter · #4 ·
I heard about this Hasport rear dogbone mount set up before. Hasport told me many people just run their rear FDRR mount to stop headers from hitting. Seems like this is the combo.
 
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