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