need knowlege in weight reducting a 89 civic hatchback si
 

i am really wantin to know what i can loose and what i can't cause i don't want to loose something very important and like a wheel fall off or something...anyway i am lookin to find out what to loose and how much it ways???

Backseat-??lbs Spare tire-bout 20-30lbs not too much else, unless u really want to gut the inside of your car-that means removing everything except the driver's seat and dash.
U could also do body panel upgrades, removing the hood and replacing w/ a carbon fiber or fiberglass hood; replacing fenders, and replacing bumpers. Those things can lower your weight. Oh, and of course dieting:).

hmm on a 89 hatchy... take everything out of the interior -jack...spare tire... back seats.. passenger seat... LIKE HE SAID^ carbon fiber anything possible... u can carbon fiber your rear hatch...but dont get fiberglass its to sensitive will break easy... unless u really want it.. not worth it though... do a swap.. get rid of ur ac pump and ur smogging stuff... all i can think of off the top of my head... good luck

i dont mean carbon fiber your whole car... lol i just mean if u want to replace it... and if it looks good replace w/ carbon fiber... hatchys are light as is they weigh about 2700 u can get a crx they weigh 2450 w/ nothing taken out straight stock...

there are lots of avenues you can take: buy an 88 crx HF and put your engine tranny in there (have to swap out the front spindles too) - the HF is lighter and the 88 doesn't have the side impact beam in the doors - this thing stock weighs in at 2100lbs

gut your car: interior, remove power anything (convert to manual windows / door locks), remove the entire a/c system, remove the radio & speakers, sound deadening, put on a ss header and remove the iron exhaust manifold

this is just some simple yet cheap tips - you can get expensive and reduce the safety of your car by getting buying cf hood, doors, fenders, plexiglass windows, removing the bumper impact structure and fabricating mounts for the bumper covers...

One trick autocrossers and bicycle racers use is to remove weight from rotating parts (tires and wheels). Removing one ounce from a rotating part is the same as removing 3 ounces from a non-rotating part.

Be careful when using thin side-wall racing tires (they damage much more easily than normal street tires) for street applications.

here are the stock weights:

1988 Honda CRX Si MT 2017
1988 Honda CRX DX MT 1922
1988 Honda CRX HF MT 1819

1988 Honda Civic DX SDN MT 2039
1988 Honda Civic LX SDN MT 2138
1988 Honda Civic DX HB MT 1993
1988 Honda Civic STD HB MT 1933

1989 Honda CRX Si MT 2138
1989 Honda CRX DX MT 2048
1989 Honda CRX HF MT 1834

1989 Honda Civic DX SDN MT 2147
1989 Honda Civic LX SDN MT 2211
1989 Honda Civic Si HB MT 2161
1989 Honda Civic DX HB MT 2088
1989 Honda Civic STD HB MT 2013

1990 Honda CRX Si MT 2174
1990 Honda CRX DX MT 2103
1990 Honda CRX HF MT 1967

1990 Honda Civic DX SDN MT 2262
1990 Honda Civic LX SDN MT 2322
1990 Honda Civic EX SDN MT 2374
1990 Honda Civic Si HB MT 2291
1990 Honda Civic DX HB MT 2165
1990 Honda Civic STD HB MT 2127

1991 Honda CRX DX MT 2103
1991 Honda CRX HF MT 1967
1991 Honda CRX Si MT 2174

1991 Honda Civic DX SDN MT 2262
1991 Honda Civic LX SDN MT 2322
1991 Honda Civic EX SDN MT 2374
1991 Honda Civic Si HB MT 2291
1991 Honda Civic DX HB MT 2165
1991 Honda Civic STD HB MT 2127

Take out everything non-critical to proper functioning.

that's easy...my 944 is gutted (no a/c, heater, sound deadening, even headlights will be removed but kept at an option in case of races that require their use - mainly foggy/rainy days)