A Look Inside – APD’s MPTCC TU Class Killer Acura TSX


Every tube was designed in Solid Works and the cage was pre assembled and rendered which made the actual cage construction very fast.  The cage would also be really easy to duplicate.

The car was constructed at APD Team Headquarters, 42 Autosports, in Concord, NC. (Located in the heart of NASCAR/Grand Am country, which provided the team with some unique resources.) Project leader and chief mechanic, James Longhurst an ASE/Acura Certified Master Technician was in charge of the build.  The 3318 Lb car was completely gutted and a roll cage was fabricated to Grand am spec by a NASCAR fabricator utilizing Solid Works software to shorten workflow. Design and cage construction took only 3 days!  When finished the build up the car in race trim with driver and ½ tank of fuel weighed in at 2840 Lbs on the MotoIQ scales at Cal Speedway.

It is amazing that this cage was built in only 3 days!
The cage was mig welded.  There is nothing wrong with good mig welding for a mild steel cage.
The finished cage is a masterpiece!  Sign us up for a 3 day wonder like this!

The stock engine output was base lined at 42 Autosports sister shop by John Earl of Six Sigma Dyno Services on a Dyno Dynamics unit and produced 148hp and 119tq before modification. After mods, on the Six Sigma dyno it produced 173hp and 148tq an increase of 25hp and 29tq. On Road Race Engineering’s Dynopack Hub Dyno for MotoIQ Certification, at California Speedway, the mods yielded 201hp and 164tq.

The cage completely ties the unibody of the car together.

Stock k24A2 engine spec:
Displacement: 2,354 cc (143.6 cu in)
Power: 200 PS (150 kW; 200 hp) @ 6800 rpm
Torque: 232 N·m (171 lb·ft) @ 4500 rpm (166 lbft @ 4500 rpm U.S.)
Bore: 87 mm
Stroke: 99 mm
Compression: 10.5:1
Redline: 7100rpm

The team saw impressive power gains just from freshening up the engine, blueprinting it, header, exhaust, air intake and getting a good tune with a Hondata ECU.  Just a typical K motor.  We feel that the K motor is the best 4 cylinder engine on the market.


Our official impound dyno chart shows impressive power.  To meet the TU requirements, the team is going to continue to develop the engine.


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