Route exhaust out of the back of the vehicle.
Routes exhaust out the rear to avoid heating surrounding components and to minimise the risk of burns when the car is being worked on or lifted. The 1.5 inch diameter was experimentally shown to reduce noise emissions below the sound test limits.
No part-specific design process is documented. The Manifolds subsystem design process applies: 1. Build the engine model in GT Suite from measured geometry: silicone-cast and 3D-scanned intake ports, dial-indicator-measured cam lobe profiles, MTS-measured valve spring curves. 2. Use GEM3D to convert manifold CAD into GT Suite flow geometry, which cut manifold setup from several hours to about 30 minutes and let subassemblies be swapped for fast comparison. 3. Sweep plenum volume, runner length and primary length in the model against volumetric efficiency. 4. Confirm on the flow bench. CR26I plenum flowed 2.34% more than CR25 and 11.15% more than CR22 on average across 10-50 in-H2O, with testing extended to 70 in-H2O (17.4 kPa) to reach WOT conditions. 5. Prototype-test the muffler on the previous car before finalising, sweeping length (14 in and 16 in), packing density, tailpipe diameter (2 in and 1.5 in) and a diffuser-style tip against the sound limits.
The CR25 one-pager records an isentropic compressible analysis to find the minimum inner diameter that would not choke the system at maximum mass flow rate. That gave 1.01 in. Because of the number of assumptions the team sized up for safety, and the smallest pipe Ticon sold was 1.5 in OD (1.422 in ID), replacing the previous 2 in OD (1.93 in ID) secondary.
CP1 titanium. From the cost report drawings and CAD: From the cost report drawings: CP2 Titanium (CR25 Tailpipe).
None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.
CAD mass, CR22 master assembly: 0.822 lb (0.373 kg). CG at X 69.07 in, Y 21.25 in, Z 9.84 in in vehicle coordinates. Dimensions called out on the cost report drawings. These are the figures printed on the drawing, not a labelled specification; open the drawing itself for what each one refers to. CR25 Tailpipe (as drawn): 245.35, 24.53, 152.40, 15.24, 76.207.62, 673.5867.36, 3.18, R0.32, 7.94, R0.79 CR26i Tail Pipe (as drawn): 19.05, R1.91, 38.86, 3.89, 55.41, 5.54, 431.80, 43.18 Source: SolidWorks mass model exports: CR22 (5 May 2024), CR25 (4 Jul 2025), CR26I (30 Jul 2025), CR26E (22 Mar 2026) | Cost report drawings: CR25/Powertrain/Design/Y - Cost Report Drawings/Manifolds/Exhaust/CR25 Tailpipe.pdf; CR26i/Powertrain - IC/Design/Y - Cost Report Drawings/Manifolds/Exhaust/CR25 Tailpipe.pdf; CR26i/Powertrain - IC/Design/Y - Cost Report Drawings/Manifolds/Exhaust/CR26i Tail Pipe.pdf; CR27i/.Powertrain/Design/Y - Cost Report Drawings/Manifolds/Exhaust/Archive/CR25 Tailpipe.pdf and 1 more Quantity per car, as costed: 1
Nothing in CrimsonStorage covers these yet.