Metrics
Weight
Performance
K20 Swap
Disassembly
Cooling
HVAC
Firewall
Fuel System
Electrical
Engine
Mounts
Exhaust
Misc
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The stock car with 2ZZ engine weighted using corner weight scales on a leveled surface. Note that the corner weights are not correct - the left-rear/right-front diagonal is 40 lbs too heavy without driver, and 60 lbs too heavy with driver.
Stock 2005 Lotus, touring pack, soft-top, 5 gallons fuel, no driver, 1941 lbs:
As above but with driver, 2093 lbs:
After the swap the car weighed 1888 lbs with 5 gallons of fuel. Approximate changes were:
| Starting weight | 1941.0 | |
| Replace soft top with hard top | +10.4 | 1951.4 |
| Replace stock wheels with CE28N | -30.5 | 1920.9 |
| Replace stock battery | -16.9 | 1904.0 |
| Replace climate box | -1.5 | 1902.5 |
| Replace front upper shock mounts | -0.8 | 1901.7 |
| Penske suspension | +0.7 | 1902.4 |
| New rear heatshield | -0.1 | 1902.3 |
| Engine swap | - ? | |
| Intercoolers | + ? | |
| New tires | + ? | |
| Final weight | 1920.0 |
The oil coolers were converted to air/water heat exchangers for a future supercharger intercooler. The 1888 lb final weight included the two front heat exchangers, tubing, fluid pump, expansion tank and a gallon or so of water.
The replacement tires were heavier than the stock tires, with wider tires both front and rear.
It is difficult to directly compare the weight change from the engine swap because the engines were not comparable. eg the 2ZZ did not have a LSD, but the Honda transmission did. The 2ZZ had the stock exhaust whereas the Honda engine uses a tubular exhaust system. My best estimate is that the Honda engine / transmission / mounts is about 2 lbs lighter than the 2ZZ, the exhaust system is 20 lbs lighter, the supercharger adds approximately 20 lbs, the intercoolers added 10 lbs, the tires added 5 lbs from the tires to give about 30 lbs in saving from other items associated with the swap.