7xl preformace

[Serum]

Procharged, would you please be so kind to use the edit button more frequently?

I was just reading thru this post, and it seemed so hectic. Thanks for your understanding. I can imagine you where getting enthusiastic though :p

Normally a product is payed in the weight of the material that the actual product is. not the weight of the bar it was made from. (at least, this is the case here in Holland at a few places i know)

With titanium the price of the material isn't the thing that makes a thing as a diffcup so expensive. It's the intense machining..

I drive my 7XL on 14 cells with the following upgrades;
rear UE shafts, center MIP's front shafts i kept stock (you want a bit of flexibility with those stock diff gears) I also use the Gmaxx singlespeed, and even with that, i wasted a stock idler (the singlespeed takes the huge play out of the drivetrain a normal 2 speed transmission has)

I prefer the idlers from mike over the UE's, the ones Mike has run smoother. (and logical, more silent too)

The 7XL on 14 cells is a true monster.

I wouldn't use tires, such as mulchers. They are very, very hard on the drivetrain.



it's not the diffcups that are a concern. It are the gears that sit inside the diffs that are.

It's wise to get a handful of shims and mesh the gears as tight as possible without binding. Also; don't use silicone oil in them, it will leak out, and get in your bearings. the last place you want the silicone oil to hang around..

[Procharged5.0]

Serum,

1) Not sure what you're referring to with respect to the edit button.

2) The price of Ti barstock ABSOLUTELY plays into the cost of the final product as well as the machining which is no more intense but does require special cutting tools, lubricants, and machining speeds as I previously mentioned. This also drives up the cost since Ti is hard on machine tools.

3) Flex in the diffs (cups and cases) does in fact play into their early demise on high power maxxes. Improving the quality of the diff gears & pinions is always a great upgrade, no question there.

4) The UE gears are very well made but for perfect mesh and silent running you need to lightly de-burr/polish the teeth which have an ever so slight burr from the machining process. A quality lube also makes a difference. I've been working with two major performance oil manufacturer's on a lube for RC transmissions (thru my drag racing & NASCAR affilliations). I may market the product at some point in the near future. It's in beta testing right now.

[BrianG]

As to the edit button: after you post, there is a button at the bottom right side of your post that says "edit" right next to the "quote" button. If you wait too long (don't know the exact interval) the button goes away though.

[Procharged5.0]

Brian,

Thanks. I'm aware of and do use the edit button. My question to Serum was what it was he thought I was supposed to edit. I fail to see what was so hectic & chaotic about the posts.

[coolhandcountry]

I think serum was refering to the 11;35 then the 11;38 post back to back.

[Procharged5.0]

Could be.

The posts were addressing different things, but whatever. I'll try and be more mindfull of my posts so no one gets "upset".

:010:

[Serum]

That one Leroy refers to and the 12.04 and 12.05 post. So those two non-edited posts made me say what i wanted to say. If you disagree, you can PM me about it.

I see you think i am nitpicking on you. Which is not the case. I was just sharing it and i didn't want to make a point of it. Perhaps it would had been more appropriate if i PMd you about it. but again, i wasn't nitpicking, i was just saying something to you like i do to all other users that post replies right after each other.. Some users don't like to get a PM about something like this, so it's rather hard to judge a person on a few posts.

What do you think is the price difference with a difficult part to cut like a diffcup? (this is what we are talking about) if made in small quantities, I don't think the price of the material will drastically increase the price of the product. It's the machining and programming that takes the biggest part of it. So from that point of view the material isn't good for the biggest part of the price.

I use a dry PTFE lube inside the tranny and it stays butter-smooth.

about the diffcup, i should had been more clear; i meant that an aluminum diffcup is good enough, (like the FLM you are using, which i read in your signature) no need for a titanium one. (because you where asking him if he could have his dad made you some) a 7075 cup covers the load more than enough. (obviously better than a 6061 cup) And from that point of view, it are the inside gears that are the weak link.

will these cvds handle the force of that 7xl http://www.rc-monster.com/proddetail...=TBTM01&cat=17

[Serum]

I am hearing mixed stories about these shafts. one loves them, while another one keeps braking them.

The thing with MIP or UE shafts is that you can use them in the future with 1/8th diffs. these are too short.

[Procharged5.0]

Emaxx Driver,

Invest in the UE 6mm or 8mm CVD's and be done with it. If money is an issue buy the MIP's or perhaps the Tsais T-Bonz Mike sells. Simple as that. I have not used the T-Bonz but I doubt Mike would sell them if they were not up to the task. I would avoid both the RD Logics and the metal splined versions based on personal experiences. I've seen the splined versions spilt in the splined area on a .28 powered T-Maxx.

[Procharged5.0]

Serum,

1) Sorry about the back to back posts. Enough said, lets move on.

2) With respect to diff cups. 7075 cups will be more than adequate and I agree, at this point given my set-up with 7075 cups, 7075 cases, and upgraded hardware the weak link is now the gears. No argument. For a stock diff the cases & cups are "flexible" which allows for mis-alignment and the inevitable broken gear tooth which is why I'm recommend alloy diff cases & cups, plus RRP gears whenever possible.

3) Regarding machining costs...........
My comments were based on larger production runs not "one offs" or very small runs. I agree 100% that the initial production of a part is expensive and that the programming, machine set-up, QC, etc., are by far the largest part of the initial cost and not the material. In established production runs the material and special tooling run the costs up for the Ti parts.

you have all been a great help but one simple question what is this http://www.rc-monster.com/proddetail...=6vubec&cat=21 and what dose it do and will i need to run on two 6 cell packs with the 9920 and can someone plz show me pics of who this controler is setup on their thx

[Hustler]

I would like to get the answer to the same question above, about the UBEC. Also whats the maximum top speed, the 7xl motor is capable of ? Without running hot or anything.

[neweuser]

The ubec replaces the use of an rx battery pack. the speeds depend on a few factors, gearing, batteries, etc...

[Hustler]

Originally Posted by neweuser

The ubec replaces the use of an rx battery pack. the speeds depend on a few factors, gearing, batteries, etc...

So lets say with "ideal" gearing and batts, is the 7xl capable of insane speeds like 70+ mph ?

On a side note, Have we found out whats the gearing in the 1/8 buggy diffs by HB?