Weight reduction

[tinkerbell]

srsly Karl - take the excess weight out AND "work on your lap times"

c'mon people!

it is NOT just about comparing lap times...

sheesh.

next dumb comment gets deleted...

lucky this is not in teh technical forum.

Weekend, track car.
Since i got the lighter rims ive had a noticable increase.
So the thought has crossed my mind pulling out the amp, amp wirering kit. And only running the rear speakers off the deck. No fronts. That would save 12kg

Then cutting the rear plastics in half so the rear seats are still usable but it doesnt continue past the rear seats. no trim in boot at all.

Then replacing driver recaro with a lighter bucket seats! something like Bride - Gardis III.

I already dont use the spare tire, tools ect. Just carry a inflation can

hint: plastic weighs very little - metal and magnets weigh lots!

[e240]

size of driver's bum weighs a fair bit too...

Ah well, in the absence of weight loss, just add power... :-p

[ChargeR]

srsly Karl - take the excess weight out AND "work on your lap times"

c'mon people!

it is NOT just about comparing lap times...

sheesh.

next dumb comment gets deleted...

lucky this is not in teh technical forum.



hint: plastic weighs very little - metal and magnets weigh lots!

I don't see any dumb comments. What is it about then? Pulling stuff out of a perfectly good car? That proves nothing except that a lighter car is faster, I can tell Karl that for a fact and he doesn't even have to leave his computer.

[tRipitaka]

I'm not sure why you think our comments are dumb comments.

How is the OP going to know whether it's worth it if he doesn't experience it himself?
What if having that extra weight helps with his driving style? Hence my comment telling him to try both, and to see if it's worth it to him.

You say it's not about comparing lap times, then what is it about?
It's certainly not about comfort. Cabin noises go up, you can't have as many passengers etc.

To the OP, try both alternatives. Just don't do anything you can't reverse, unless you are sure.

srsly Karl - take the excess weight out AND "work on your lap times"

c'mon people!

it is NOT just about comparing lap times...

sheesh.

next dumb comment gets deleted...

lucky this is not in teh technical forum.

[tinkerbell]

Karl - how many timed circuit laps have you done mate?

Karl - do you want your car to be lighter now? or later on when you are proficent at driving?

others - as i noted above, reducing weight is beneficial to lots of things, and since 'we' dont spend more than 5-10% of our cars time on the race track, why limit the benefits of weight reduction when we might putter around daily carrying *excess* baggage the other 90-95% of the time?

others - reread post #22

however, understanding how and *where* to reduce weight is critical to achieving the above sucessfully.

make a list of all the things on your car you can remove, list their weight, list their position on the car (high/low or fore/aft) and then list how important these parts you can remove are to you personally (e.g stereo; might want one, airbags; might want to die less, air con; might like to be cool, rear spoiler; might never go over 130km/h)

once you have this list - it becomes obvious what to remove...

see how i was trying to be constructive, instead of going: oh, you cant drive, so you won't notice it anyway?

he has already said he noticed the benefit of weight reduction, and wanted to know more...

[tinkerbell]

I don't see any dumb comments.

Your car will never be as light as a CR-X anyway, just saying.

???

[Karl]

Doing the list you mentioned tink.
After lots of searching does any one no these weights
Stock headdeck
Stock speaker
C pipe
J's racing SS catback

Ill post the info ive gathered when done!

[tRipitaka]

Karl - do you want your car to be lighter now? or later on when you are proficent at driving?

Isn't that all the fun in modifying? To know what works, and what doesn't?

others - as i noted above, reducing weight is beneficial to lots of things, and since 'we' dont spend more than 5-10% of our cars time on the race track, why limit the benefits of weight reduction when we might putter around daily carrying *excess* baggage the other 90-95% of the time?

Exactly my point. If you're spending a small percentage at the track, why ruin your ride comfort, when you'll be spending 90% of your time on the street anyway?
Remove your rear seats, and legally you have to change it through your RTA.

see how i was trying to be constructive, instead of going: oh, you cant drive, so you won't notice it anyway?

So you threaten to delete our comments if we don't agree with you?

Shouldn't this thread be open for discussion and advice?
Let the OP decide on what they want to do.

If not, then delete all of our comments, and just leave yours. Your call.

[ChargeR]

???

The comment about the mass of a CR-X wasn't totally relevant to the subject of the thread.

However the comments made by myself and others regarding track experience taking precedence over weight reduction are valid. How is Karl going to get a measurable gain in track performance when his driving is inconsistent? He can't. There will be a gain in performance due to the reduced mass, but it will be buried in amongst the improvements in driving skill. So he will be forever ignorant.

I didn't consider fuel economy or some of the other points you mentioned as that didn't appear to be main motivation behind his weight reduction.

[tinkerbell]

Isn't that all the fun in modifying? To know what works, and what doesn't?

um, i get fun from going 'as fast as possible'

Exactly my point. If you're spending a small percentage at the track, why ruin your ride comfort, when you'll be spending 90% of your time on the street anyway?

because a lighter car uses less petrol, just as one example...

and why does weight reduction have to always compromise ride comfort?

does removing the rear wiper really make the car noisy and uncomfortable?

does not having an amplifer really compromise NVH??

c'mon, there is more to weight reduction than i think you are thinking...

hence why Karl is compiling the list.

Remove your rear seats, and legally you have to change it through your RTA.

correct, but where did i say to remove seats?

So you threaten to delete our comments if we don't agree with you?

what do you not agree with me about?

Shouldn't this thread be open for discussion and advice?

the OP asked:

Worth it or not? What have you guys shed to save weight? Was it worth it?

all you guys have done is say: 'it is not worth it for you Karl'

none of you have said:

'i removed X and when i did i compared my lap times and i was slower/faster'

Let the OP decide on what they want to do.

cartoon, rookie and TOU93 are pretty much the only guys who have provided advice that the OP can take into account in making a decision...

[tinkerbell]

The comment about the mass of a CR-X wasn't totally relevant to the subject of the thread.

However the comments made by myself and others regarding track experience taking precedence over weight reduction are valid. How is Karl going to get a measurable gain in track performance when his driving is inconsistent? He can't. There will be a gain in performance due to the reduced mass, but it will be buried in amongst the improvements in driving skill. So he will be forever ignorant.
.

so you are concerned for Karl's ignorance?

some say 'ignorance is bliss' - in this case, knowing what type of weight reduction does what probably is irellevant!

as you correctly state:

a lighter car is faster, I can tell Karl that for a fact and he doesn't even have to leave his computer.

maybe you guys place more empahsis in knowing how a change to your car makes it behave differently, but others might simply want to know how fast they can go!

[Karl]

ok so ive worked out what ive lost
Front 8kg mid 13kg rear 24
Had to estimate some weights as couldn't find.

[tinkerbell]

so you have reduced by 45kg? that is almost 5% of your cars weight

a fair bit off the rear, so that will probaly increase oversteer tendency... (relocating the battery to the LHS rear could improve the weight balance, but the weight of the cable needs to be considered)

but did you add any weight?

where else do you propose to reduce weight?

[Karl]

Ive added weight with the koyo rad and extra radiator fluid.
C pillar bar
Genune rear strut bar
Im pulling out front speaker but keeping rear JL's
And the jdm front conversion.
And headdeck over stock dont no if lost or gained.
That was minused from the weight i lost!

On track days the front passenger seat will come out. rear will prop stay in for weight distribution."also its a pain to get out"

Ive thought about battery relocation.
Would use 25mm2 cable thats weighs 1.2kg for 3m
plus battery box,distribution block, 25mm lug,battery terminals.

Properly not worth it. better getting a lighter battery when need replacing. And adding that weight in the back with roll cage down the track

[Karl]

Just to add. I don't know about u guys. But i can feel a significant difference with a passenger in the car. And also between full and empty tank of petrol.