Weight ReductionHome | Free Mods | Intake | Ported Heads & Manifold | Exhaust | Gears | Transmission | Brakes | Parasitic HP | Fuelling | Interior | Weight | Performance | HP Gains | PartsAcceleration is inversely proportional to the weight/power ratio so you can reduce that ratio by removing weight from the vehicle as well as by adding horsepower/torque. Each 3% reduction in curb weight results in a 1% reduction in 1/4 mile ET and a 1% increase in 1/4 mile trap speed. With optimized traction and gearing, the weight/rwhp ratio (with driver) required to reach your target 1/4 mile ET is roughly as follows: 16.0 secs: 24.38lb/rwhp 15.0 secs: 20.08lb/rwhp 14.0 secs: 16.33lb/rwhp 13.0 secs: 13.08lb/rwhp 12.0 secs: 10.28lb/rwhp 11.0 secs: 7.92lb/rwhp 10.0 secs: 5.95lb/rwhp Some items can be removed altogether from the vehicle at no cost while others can be replaced by lighter items. Items Removed Stock front seats (without tracks): 72lb Stock upper/lower intake manifold: 35lb AC Delete: 33lb Rear seat back: 28lb Stock single-piston front brake calipers, brackets, hoses, & pads: 25lb Stock 10.8" front brake rotors: 22lb Stock rear driveshaft: 20lb Power driver's seat track: 13lb Rear seat cushion: 12lb Stock rear lower control arms: 11lb Smog pump & EGR assemblies: 10lb Rear differential "dogbone": 8lb Strut tower brace: 8lb Aftermarket electric fans: 7lb Rear spoiler: 7lb Stock rear upper control arms: 6lb Stock steering wheel: 6lb Fog lights & mounting brackets: 5lb Rear quad shocks & mounting brackets: 5lb Jack: 5lb Cruise control module & vacuum canister: 4lb Driver's side airbag: 3lb Rear seat headrest: 3lb Heater tube assembly & hoses (with coolant): 3lb Smog pump mounting bracket: 2lb Smog pump/EGR solenoids & vacuum lines: 2lb Knee bolster reinforcement plate: 2lb Radiator core support plastic shield: 1lb Rubber blocks behind rear wheels: 1lb Front plastic splashguard: 1lb TOTAL: 360lb Items Added Modified '01 Jeep Cherokee front seats: 48lb Edelbrock Performer upper/lower intake manifold with Trick Flow adapter elbow: 38lb '94-'98 Cobra 13" front brake rotors: 33lb '94-'98 Cobra PBR dual-piston front brake calipers, brackets, hoses, & pads: 16lb Maximum Motorsports HD rear lower control arms: 13lb Custom rear seat delete kit: 13lb Ford Racing aluminium driveshaft: 11lb Manual seat track: 7lb Edelbrock rear upper control arms: 6lb 1.25" rear wheel spacers: 5lb Aftermarket steering wheel & adapter boss: 4lb Hayden HD transmission oil cooler: 1lb TOTAL: 195lb Overall weight saving: 165lb
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Underhood Clean Up
Removal of the following items from the engine compartment considerably increased underhood space and made servicing of other items much easier: |
AC Delete
Removal of the air conditioning components from the engine compartment liberated more underhood space and reduced the weight over the front wheels: |
Alternator/Smog Pump Mounting Bracket
Since I'd already removed the smog pump assembly, I also had the smog pump mounting bracket component cut off from the main bracket at the line that I drew. This saved 2lb and gained some underhood space. |