Perfect Pass is doing nice Mod-1 gears now.

[Dan B.]

These look really great. Slightly thinner than the Saga gears, but much lighter. I’ll definitely give them a shot at some point. I just got three more from Saga last week, but the next time I need a different tooth count I’ll try Shifrin’s for sure. He said all are Mod-1, 8mm shaft. No mention of 5mm’s, but I haven’t checked his site yet.

 

[kaladeth]

Thanks Dan. Have you tried Scorched’s gears too?

https://scorchedparts.co.uk/products/scorched-parts-spur-gears-mod1-8mm-bore-26-50t

And those new arms!?

https://scorchedparts.co.uk/products/aluminium-speedrun-arm-kit-arrma-limitless-infraction-felony

 

[332_RC]

That's too cool. I saw the email about them. And I just got a new spool spur last week. Almost went with a Saga pinion & use it as a spur, & was uncertain about that. I have seen here on Arrma Forum it was done. I should have held out & got the lighter Perfect Pass for a spool spur.

 

[Dan B.]

Thanks Dan. Have you tried Scorched’s gears too?

https://scorchedparts.co.uk/products/scorched-parts-spur-gears-mod1-8mm-bore-26-50t

And those new arms!?

https://scorchedparts.co.uk/products/aluminium-speedrun-arm-kit-arrma-limitless-infraction-felony

I haven’t. For years now I’ve never really bought gears from anyone except Saga (95%) and Robinson racing with a few Tekno gears for the smaller trucks.
If you want an infraction diff in your street basher, Robinson makes spurs as small as 40t. All my other 6s rig gears (and my Mod 1.5’s for the big Losi) are Saga.
I’m not really feeling the Scorched A-arms. I’m taking a different approach with crazy heavy springs and internal shock limiters to set ride height OR just simply run struts. Running both seems kind of weird. I think I’m still pretty much married to Vitavon arms, especially now that Scorched is making the rear knuckles as wide as the a-arm outside mounting point in the rear.
EDIT: I just looked at the Scorched arms. I didn’t understand that they used a progressive link. It makes much more sense to me now. Dammit, @kaladeth I did NOT need to learn that!

 

[Dan B.]

That's too cool. I saw the email about them. And I just got a new spool spur last week. Almost went with a Saga pinion & use it as a spur, & was uncertain about that. I have seen here on Arrma Forum it was done. I should have held out & got the lighter Perfect Pass for a spool spur.

For a good center spool setup you can’t beat Saga, at least up until now. Any 8mm Mod-1 will work, and that way you don’t need different sized gears for spools and pinions. They all interchange, which is awesome. Unless you’re running a 5mm shaft motor, of course.

 

[332_RC]

For a good center spool setup you can’t beat Saga, at least up until now. Any 8mm Mod-1 will work, and that way you don’t need different sized gears for spools and pinions. They all interchange, which is awesome. Unless you’re running a 5mm shaft motor, of course.

Great info. Thanks Dan. I purchased a @RamJamRacing titanium 8mm center spool & it's in transit. Maybe I should look at the Perfect Pass gears also.

 

[Dan B.]

Great info. Thanks Dan. I purchased a @RamJamRacing titanium 8mm center spool & it's in transit. Maybe I should look at the Perfect Pass gears also.View attachment 414593

I’ve used the RamJam spools on my last two builds and they’re fantastic. I bought the first one completely out of impatience because Island Hobby Nut had them in stock and they’re only a day away from me with standard shipping. I was in the middle of a build and didn’t want to wait for the Scorched one (also awesome) to get here from the UK. I’m really glad I tried them. They’re cheaper, too. You’re going to absolutely love the flexibility of where you can set the spur after getting the pinion perfectly set on the motor shaft without flipping them or running them so close to the mount you can hardly get to the grub screws. It’s a serious game changer.

 

[332_RC]

I’ve used the RamJam spools on my last two builds and they’re fantastic. You’re going to absolutely love the flexibility of where you can set the spur after getting the pinion perfectly set on the motor shaft without flipping them or running them so close to the mount you can hardly get to the grub screws. It’s a serious game changer.

Completely modular. Awesome. I bet the Ram Jam spool runs true & straight, good concentricity. The Arrma spool has slight runout in the rear output. So do the dogbones. I believe I have a solution for the dogbone runout. If the postal would get the RJ spool here, good grief.

 

[BashingBrian]

These look really great. Slightly thinner than the Saga gears, but much lighter. I’ll definitely give them a shot at some point. I just got three more from Saga last week, but the next time I need a different tooth count I’ll try Shifrin’s for sure. He said all are Mod-1, 8mm shaft. No mention of 5mm’s, but I haven’t checked his site yet.

@Dan B.
Nothing new here, they are made by AGFrc..

https://www.aliexpress.com/item/1005004789681492.html?pdp_npi=4@dis!GBP!￡11.09!￡11.09!!!13.39!13.39!@211b629217390317141456603e7d2e!12000030496267888!sh!UK!0!X&spm=a2g0o.store_pc_allItems_or_groupList.new_all_items_2007600720725.1005004789681492

I'm sure they will be cheaper from Ali than Raz

 

[IgelEyes]

I use Scorched’s gears in both my rigs.
They are superb quality.

 

[Jerold]

These look really great. Slightly thinner than the Saga gears, but much lighter. I’ll definitely give them a shot at some point. I just got three more from Saga last week, but the next time I need a different tooth count I’ll try Shifrin’s for sure. He said all are Mod-1, 8mm shaft. No mention of 5mm’s, but I haven’t checked his site yet.

He's got a point with the weight reduction. The are tiny flywheels and lighter gears will respond better. They look to be high quality machining and more affordable than a lot of other name brands.

Don't get me wrong, I think Raz makes good stuff, but I think the weight savings has minimal effect on performance of a 15lb rig. If this was a 2lb rig it would be more significant.

The 30g difference is very small.

Assuming it's math is correct. Copilot says - the rotational mass (moment of inertia) for the first gear is approximately 0.0000253125 kg·m², and for the second gear, it is approximately 0.0000165625 kg·m².

This also assumes evenly distributed mass, which the holey gear is not, as most of the mass is towards the gear teeth. Which makes the difference is even less.

Copilot says - the difference in energy required to turn both gears at 30,000 RPM is approximately 43 Joules.

This is 4.3W over 10sec run. It's probably less power saved than your fan uses and considering your max power output is more like 10KW+, it's not going to make a difference.

 

[332_RC]

He's got a point with the weight reduction. The are tiny flywheels and lighter gears will respond better. They look to be high quality machining and more affordable than a lot of other name brands.

Don't get me wrong, I think Raz makes good stuff, but I think the weight savings has minimal effect on performance of a 15lb rig. If this was a 2lb rig it would be more significant.

The 30g difference is very small.

Assuming it's math is correct. Copilot says - the rotational mass (moment of inertia) for the first gear is approximately 0.0000253125 kg·m², and for the second gear, it is approximately 0.0000165625 kg·m².

This also assumes evenly distributed mass, which the holey gear is not, as most of the mass is towards the gear teeth. Which makes the difference is even less.

Copilot says - the difference in energy required to turn both gears at 30,000 RPM is approximately 43 Joules.

This is 4.3W over 10sec run. It's probably less power saved than your fan uses and considering your max power output is more like 10KW+, it's not going to make a difference.

So it's the equivalent of like putting a CAI on a car, & saying 'I can tell a difference!' even though there's none? But it's still better than stock- if the only gain is better concentricity in the spool, less vibration, longer life of driveline, & less parasitic loss=More power to the wheels- even it's a tiny amount. Same as putting a CAI on a car.

 

[Tex Koder]

So it's the equivalent of like putting a CAI on a car, & saying 'I can tell a difference!' even though there's none? But it's still better than stock- if the only gain is better concentricity in the spool, less vibration, longer life of driveline, & less parasitic loss=More power to the wheels- even it's a tiny amount. Same as putting a CAI on a car.

More like putting little trumpets directly onto your intakes..

 

[332_RC]

More like putting little trumpets directly onto your intakes..

Yep- I'll try the Perfect Pass gear. The stock Arrma 39t spool gear has runout. I can already see uneven wear marks in the teeth- more on one side than the other- across the tooth & 180° apart on the gear. If it's lighter & has no drag- it'll spin faster.

 

[Jerold]

So it's the equivalent of like putting a CAI on a car, & saying 'I can tell a difference!' even though there's none? But it's still better than stock- if the only gain is better concentricity in the spool, less vibration, longer life of driveline, & less parasitic loss=More power to the wheels- even it's a tiny amount. Same as putting a CAI on a car.

Kind of similar. But CAI sounds good.

 

[332_RC]

Kind of similar. But CAI sounds good.

There are so many acronyms on this forum

 

[Jerold]

There are so many acronyms on this forum

CAI - Cold Air Intake, no?

Did you think it's Computer Assisted Instruction?

 

[332_RC]

CAI - Cold Air Intake, no?

Did you think it's Computer Assisted Instruction?

No no- I did mean cold air intake. Like so many people put a CAI on their car & claim its 15hp gain. It's not. It may gain some hp at a certain rpm, but not a constant 15hp gain. The gear mod may be a gain, but in some areas. Not just a total omg now I've picked up 15 mph top speed. No. Its a good upgrade in general over stock.

 

[Jerold]

No no- I did mean cold air intake. Like so many people put a CAI on their car & claim its 15hp gain. It's not. It may gain some hp at a certain rpm, but not a constant 15hp gain. The gear mod may be a gain, but in some areas. Not just a total omg now I've picked up 15 mph top speed. No. Its a good upgrade in general over stock.

So true. It's like 2 HP, but it tends to be in the low end and the throttle response is better. This is important when you have a 100hp Honda, it's a big deal. Not so important when you have 300 hp.

Speaking of snake oil, I got into a Cyberfight with some guy that was selling "Earthing Kits". "Earthing Kits" are a spider web of thick ground wires between the motor, the chassis and the battery.

Circular Grounding System - By utilizing a 24 karat gold plated distribution block and multiple grounding points, improved idle and drivability are often obtained as the additional grounding points equalize resistance and voltage between various ground points. Each 8 gauge spiral twined cable is wrapped with signature HKS purple insulation to protect and add color to the Circle Earth System. Vehicle specific kits included pre-measured cable lengths and distribution blocks​

Gold is about 60% as conductive as Copper. They use in electronics contacts (connectors) because it doesn't oxidize as easily; however, it does wear out much faster.

They look nice but don't really do squat. I told him is was crap and he said it was 6 HP gain. My response was show me the dyno plots with the same car under the same conditions and I would by 5 kits from him. I'm still waiting for the plots, but my offer still stands.

 

[332_RC]

So true. It's like 2 HP, but it tends to be in the low end and the throttle response is better. This is important when you have a 100hp Honda, it's a big deal. Not so important when you have 300 hp.
Speaking of snake oil, I got into a Cyberfight with some guy that was selling "Earthing Kits".
They look nice but don't really do squat. I told him is was crap and he said it was 6 HP gain. My response was show me the dyno plots with the same car under the same conditions and I would by 5 kits from him. I'm still waiting for the plots, but my offer still stands.

Oh- don't be curmudgeon! He's a salesman!