ways 2 add wieght in back?

[sleepz]

i am thinkin when i install this rb25 in tha s13 there will be major issues of having burnouts... anyone got ways 2 add wieght to the back? here are some that i think may work.... the car is gutted btw and the dash is all that remains along w/ 2 race seats.

put the battery in the backif i put a 5 lug conversion in the back only.... this would be heavier right?keep the gas tank fullheavier 5 lug rims????carbon fiber hood in the front

only want 2 add the needed wieght 2 the back to make up for the wieght gained by the rb25det, help plzzz...zeropost?cmd=newtopic&id=88#http://foru ... er...id=88#

[AmoebAssassin]

Why put weight in the back when you can take weight off the front?

Get a CF hoodMove the battery to the trunk or get a slim batteryRemove unneccesary equp from the engine bayetc.JDM S13 front end will save weight on a USDM S13

Honestly, it doesnt make a difference whether you do any of this or not, because you won't feel the difference from the KA to the RB unless you are a world class driver.

[1990flatblack240]

i am thinkin when i install this rb25 in tha s13 there will be major issues of having burnouts...

Vlsd?Replace spare tire with a heaiver 17 inch rim.Stero? Or you could always drive around with a fat girl in the back.

[93coupe]

Honestly, it doesnt make a difference whether you do any of this or not, because you won't feel the difference from the KA to the RB unless you are a world class driver.

Or you could always drive around with a fat girl in the back.

or that will work

[skylndrftr]

heavier wheels will do more to increase rotational inertia than increase traction. if your really concerned about it just go buy a inch thick steel plate and weld it in...lots of weigth and added stiffness to boot

[Ezekial]

roll cage, surge tank, etc

[tyrannix]

or the mad max drum-o-fuel in the back (then youll only have to fill up once every 6 months or something

[Mettler]

Couple of dead bodies works quite nicely.

[naed240sx]

i am thinkin when i install this rb25 in tha s13 there will be major issues of having burnouts...

I read about this far and stopped. Why is this guy not getting flamed? lol. Yeah I'm sure it's gonna be really hard to do burnouts with 250 horsepower on tap lol.

[Mettler]

I read about this far and stopped. Why is this guy not getting flamed? lol. Yeah I'm sure it's gonna be really hard to do burnouts with 250 horsepower on tap lol.

Clearly it's you that needs to be flamed. He doesn't WANT to do burnouts... his post, should you care to read it properly, states that he is concerned with EXCESSIVE wheelspin due to the increase in power, and he is asking how to increase weight in the back of the vehicle to prevent this.

[naed240sx]

Ok, sorry I misread that. At any rate, this thread is stupid, and the creator doesn't know what he is talking about. The weight difference with the rb25 will not be that huge. In addition, it is rwd, so as soon as he launches, weight is gonna transfer to the rear wheels. He just needs to run some good tires.

[madbouncy]

You can try a different final drive if you'll be getting that much excessive wheel spin. 3.8 or 3.6, whatever you can find and won't sacrafice too much acceleration for your needs. If you're just talking about coming out of the corners you could mess with your rear sway bar. With stiff enough shocks you could soften the sway bar a bit to help out. Plus wider tires will help there as well.

[Mettler]

Ok, sorry I misread that. At any rate, this thread is stupid, and the creator doesn't know what he is talking about. The weight difference with the rb25 will not be that huge. In addition, it is rwd, so as soon as he launches, weight is gonna transfer to the rear wheels. He just needs to run some good tires.

I think you need to stop being abusive and start being more helpful if you're going to post in here.

This is the first car forum I've visited that I actually like, for its lack of kiddies and negative people calling each other stupid... I want it to stay that way.

The guy asked a genuine question, lets try help him shall we ?

For starters, an RB engine is like 1.5x to almost 2x the weight of an SR motor... and being longer it'll have more front overhang causing less weight on the back wheels. That, coupled with a significant increase in power... yeah, it WILL have a wheelspin & oversteer issue.

To fix this issue, I'd suggest a quality set of coilovers with 8kg front spring rate, and 6kg rear (unless you plan to drive it daily.) Tune the damping of the rear shocks to allow the car a bit of movement so it bites.

If you put coilovers in, no doubt your car will sit lower. This calls for a pair of adjustable camber arms for the rear.

Install a strut brace on the front.

Fit a set of 9"+ wide wheels, and at least 255mm performance directional tyres.

Replace the bushes throughout the car with urethane products, and definitely beef up your rear sway bar.

This should give your car track-like handling, and enough adjustment for you to play around to get it how you like.

[DrewQ45]

get a sand bag if you want weight

[HashiriyaS14]

Dead Hooker in the trunk.

If you don't have one you can borrow one of mine.

[TravisD]

Yeah, for handling, wheels are about the worst place to have weight. Ask the Google about "unsprung weight". I would bolt a plate into the spare wheel well.

[thatcarguy350]

Battery's your best bet. Do you have the S13 coupe? Does the convertible trunk lid fit? I don't remember where I heard it from, but they were built stronger (heavier) as to reduce flex in the convertible bodies.

[naed240sx]

Battery's your best bet. Do you have the S13 coupe? Does the convertible trunk lid fit? I don't remember where I heard it from, but they were built stronger (heavier) as to reduce flex in the convertible bodies.

A trunklid won't do a damn thing for chassis rigidity.

[thatcarguy350]

I just understood they were heavier for some reason.

[naed240sx]

I just understood they were heavier for some reason.

probably because convertible s13's suck.

[Un4Scene]

I always add some extra weight in the back of mine for the ice and snow in the winter, although my car is not gutted. I started with a loose 50lb sandbag, but it was always rolling around and it looked like crap back there. My solution was to build a custom speaker box that fits right in the back end of the car with room enough in the bottom of the box to stuff my sandbag. It's nothing fancy or special, but it'll hold up to 3 10" subs (if I wanted it to) in addition to the sand. All together it adds about 70 lbs, it looks decent, and I don't have loose sand in my car anymore. A little creativity can do wonders!

[125kart]

great video showing a true lack of tractionhttp://www.rsownersclub.co.uk/video/mk2.wmv

The subs are good for about 50Lbs. The negative effect of ADDITIONAL weight on acceleration would more than erase any traction gain. There is a thread on this site that goes into great detail explaining how tire width has no effect on traction. It left out on key component in the math explaining it. When tires break loose it is not entirely between the tire and the pavement. In most cases the grip to the pavement exceeds the molecular bond of the tire. Look at the tire marks on a white driveway or a black skidmark/burnout. So increasing the contact patch would increase the amount of rubber that would need to be scrubbed off in order brake loose. That said you would have more traction. Bring it on the math geeks

What type of acceleration is most important for you? If you are simply looking for straight line improvements I would think that lowering the rear of the car relative to the front would give you a measurable weight shift. It may look like crap but you will be blowing their doors off. I remeber back in the day with my 69 Firebird. When I had the air shocks filled so it looked like a stink bug it smoked the tires (impressing the ladys/dork). If the shocks were empty (leaky POS) it hooked up (not as impressive to the Ladys/dork) and let everyone know it was stock. If you are looking at lateral acceleration also it is much harder to get a true balance. If you have access to scales check the corner weights to see if it is infact excessivly front heavy. For $hits and grins place a 2 inch block under the front two scales and check again. I am curious as to the amount of shift. I am sure someone out there has some math degree that could figure it out. Check ou Circle track magazine they always have good articles on tuning a cars weight and suspension.

Don't forget to check out this link http://www.rsownersclub.co.uk/video/mk2.wmv

I could be wrong and, I am always wrong if you ask my wife. But what doe she know!

[sleepyRPS13]

rear downforce, dial it with an adjustable huge wing. also probably dialing in the correct suspension setup, may help.

[Dustin240]

Why in the hell are u guys adding weight ? Did u know that makes u slower? Move what u can to the back and drop weight off the frount like making a costom bumper support. Then learn how to drive it.

The only weight to ever add is a role cage or hot GF.................

[skylndrftr]

this thread is now back from the dead?