GT12 Help..

[stucartwright]

John
Thank you so so much for your in depth answer, very much appreciated. I will chop away at those recommendations and hopefully as I get closer, by the end, my driving will do the weight reduction justice.

Just to clarify then, the superstox comes out the box heavy and the hop ups when it comes to all the recommendations will reduce to super light.

I was under the impression it came out to box light.

Thanks again John and Co.

WKRCC tomorrow, will update tomorrow!

Best Wishes

[mark christopher]

Originally Posted by Xracer

Hi Stu,

well the first obvious question, are your scales accurate?

I use the SkyRC corner weight system and have checked the accuracy with a number of different weights and compared on digital kitchen scales, all compare within 0.1 grams so I have good enough calibration.

If so you are looking at 80 ish grams I believe, now that is just shy of 3 ounces in old money and quite significant.

My car uses Core alloy screws where impact does not apply any significant load or there is no resistance to a load, these are a third the weight of a steel screw and contribute overall.

So look at which screws you think you are happy to replace, weigh them, then divide by 3 that is what you would be putting back in alloy, I have 22 alloy screws in mine!

I also have 4 Core titanium screws on the king pins and 6 on the pod lower axle mount positions, these are half the weight of steel.

My receiver is a KO Propo micro with a KO RSx12 servo, 7.5 grams and 26 grams minus a couple or so for the shortened lead.

The motor wires are 14 gauge but with a thinner silicon insulation, mine are Tekin but Zen do an equivalent TQ wire.

My battery wires are 12 gauge but short.

All wires are as short as practicable without affecting the chassis movement.

The battery plugs are the soldered 4mm bullets that came with my lipos.

I have a custom lipo tray which actually locates the battery, can't imagine much weight saving there though but it is just over 1 gram!

Ceramic diff balls, longer life and weigh beggar all but cost!

64T CNC spur gear, kit moulded gears are not that accurate and may even be heavier!

Core titanium turnbuckles, half the weight.

Core bonded sensor lead as short as possible without being tight, length depends on motor port position.

Alloy Pinion, half the weight.

What is your motor weight compared to a TP 13.5T at 176 grams?

What is the weight of your lipos, my Intellect 7000's are 140 grams?

How much paint on your shell, you may be surprised at this one?

As you can see each item contributes, shortening a servo lead can save up to 5 grams depending on the wire gauge and original length.

You have seen my pictures, hopefully neat and uncluttered to the eye, well the only way I can reduce weight now is go back to a carbon chassis and use a lightweight shell but what is the point, I would need to ballast back to the limit!!!

A lightweight shell improves the handling though so is to be considered if my driving improves!!! I have some ready for painting.

The only thing that gets lighter are the tyres, oh and the body when bits fall off!!!

So happy weight chasing, losing it does cost ££ though!

Regards, John

Do you realise your car is illegal?

[mark christopher]

Originally Posted by stucartwright

John
Thank you so so much for your in depth answer, very much appreciated. I will chop away at those recommendations and hopefully as I get closer, by the end, my driving will do the weight reduction justice.

Just to clarify then, the superstox comes out the box heavy and the hop ups when it comes to all the recommendations will reduce to super light.

I was under the impression it came out to box light.

Thanks again John and Co.

WKRCC tomorrow, will update tomorrow!

Best Wishes

They are lighter out of the box pre adding options, apart from the alloy rear axle which takes off 20g

[stucartwright]

So after messing with the timing of my Dynamite motors timing, getting it to stop pulling by the end of the straight, 30T 70T 47.7mm I had it licked.

A super punch and decent straight line speed, certainly not outpaced and once again, improved on my times every run, didn't chunk a tyre and had far far less tangles with barriers and hitting apexes for fun!! Who hoo!!

I'm going to throw the alloy axle at it, purchase some 90 or 100C lipos from Orion I think, as I have 4200 40C at the moment. I assume I will see a certain increase in performance?

After watching Ollie Payne, clearly a man that has a super talent and close to the top of his game and RC world, his religious accuracy must and can only come from a complimentary behicle that has it all.

The setup of the car has without doubt given me a better feel for the balance and poise I didn't have before which has without doubt brought on my driving. Really excited post today's trip and know with a few more tweaks, a few months under my belt I'll be competing... Bring on!! Excuse the enthusiasm or what could be construed as arrogance, it's not, just loving this infectious class and how much help you guys have given me has been beyond useful.

I hope this thread continues and more newbies have a positive experience from all we have covered so far...

Best Wishes
Stu.

[mark christopher]

take a look at vapextech, good value and really good lipo

[stucartwright]

Who stocks those Mark?
Do you have a link?
Can't see any with a high C rating...

[stucartwright]

This is what I had in mind....
http://www.teamorion.com/carbon-pro-...-tubes-en.html
Thoughts or other suggestion...
If you could supply links, would be appreciated.
Stuart

[mark christopher]

Vapextech UK. Zen racing

Dont get drawn in by high c rating, gt12 can not make the most of it

[SlowOne]

C ratings are a bit like MPG figures for cars - nice to look at but wildly inaccurate in real life. For 1S it is internal resistance that counts most, and they don't tell you that!

Like Mark says, get the VapexTech cell and it will do the business.

http://www.zen-racing.co.uk/catalog/...ah-lipo-p-1266

[SlowOne]

Oh, and the post from Xracer - don't go down that road as the car will be illegal and fragile.

I don't know anyone who has built a GT that is that much overweight, so something is wrong somewhere. Mine's got 50g of lead on it with the same servo, same style of speedo and just a lighter receiver by about 10g.

Those scales of yours Stu are the first thing to check... HTH

[i4n]

Originally Posted by SlowOne

Oh, and the post from Xracer - don't go down that road as the car will be illegal and fragile.

Forgive my ignorance, but what makes it illegal?

[stucartwright]

Hi Mark
Thanks for the info on the cells. Will get take the Vapex on your recommendation.

The scales at WKRCC were used today, same deal. 945 with no body she'll on, 1040 with the shell on.

I have a no clue where the weight is.

Maybe worth a complete strip down and a rebuild. Anyone know what the weight should be without any electrics with new lowered pod, front conversion and side damper conversion? If I cut it back to bare bones could be a good place to start at least.

Have also ordered the rear alloy drive shaft.

[mark christopher]

Originally Posted by i4n

Forgive my ignorance, but what makes it illegal?

Titanium screws
64 dp gears

[stucartwright]

Sadly chaps the scales are not lying... 945 grams at WKRCC, at my home and at a friends.

I have emailed Schumacher with this issue and I will await their response.

Frustrated to say the least!

[mark christopher]

Is this the cf or s1 kit?

Not really sure what you expect Schumacher to do/say

[i4n]

Originally Posted by mark christopher

Titanium screws
64 dp gears

Cheers Mark

[stucartwright]

Well Mark
Seeing as you can't shed any light, maybe Schumacher has had previous experience of this. Or are you the Oracle on everything GT12??

[Xracer]

Hi Mark,

thanks for pulling me up on that one, strange we can use aluminium alloy though which are actually lighter but obviously not as strong but are cheaper though!

I once fitted and alloy screw on the pod pivot in error, yeah it sheared!

Even though I do not intend to race any BRCA meets I will replace the offending items, so that takes me to 950.1 grams!

I do believe in compliance even for club racing even though lots don't, so we don't know what we are actually competing against!

By the way I did not state 64DP it was 64T CNC spur gears!

Happy racing, John

[mark christopher]

Originally Posted by stucartwright

Well Mark
Seeing as you can't shed any light, maybe Schumacher has had previous experience of this. Or are you the Oracle on everything GT12??

well actually yes! been racing gt a year after its launch

seeing as you avoided my question (and as a diagnostic tech I like to get all my facts) if gone back through all the 100+ posts, from your picture you actually have a S1 chassis not a carbon chassis the s1 is significantly heavier than the carbon.

you also have some very heavy connectors on you lipo from the below picture and your receiver must be one of the heaviest out there

[stucartwright]

Mark,
As a performance coach myself, I too like to have all my facts, and clearly you had all the facts you needed to answer the question... :-)

I sense you're quite punchy with your messages which is not particularly welcomed as a newbie to the world of GT12, and I didn't intentionally avoid any questions.

However, I appreciate your keen eye and you spotting I had got a S1 chassis and not a carbon chassis. Obviously this is where the biggest impact is, connectors and my ESC is not overly heavy, I have gone through the weights of the BRCA champs and what their ESC weights are and there is barely 3-5grams in it. I am sure you are able to prove me wrong...

Thank you again...

Best Wishes
Stuart.