My 5T/5SC Project

Not your average Savage Hop ups. These are highly modified, with some home-made parts.

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FluxNZ
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Re: My 5T/5SC Project

Post by FluxNZ » Fri Nov 01, 2013 3:17 am

Thanks for doing that s2022 :wink:

They all seem to use a similar setup which is why we can swap them between on another. One of the fears I have is melting the cup like you did but I still haven't run the truck long enough to find out.

I've ordered in some new pinions and also that Tamiya oil for the centre diff to thicken it up.
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Post by LLkoolskillet » Fri Nov 01, 2013 10:54 pm

I'm emailed hpi last year and asked them what the difference was between the Flux/XL diffs and New X diffs. The ring gear for the flux is machined and the X is sintered. The pinions for both are sintered.

My nitro speed savage uses the CEN ring and pinion mated to a hellfire housing with HB bevel gears

http://www.amainhobbies.com/product_inf ... T-Hellfire
[img]http://i1105.photobucket.com/albums/h358/LLkoolskillet2/skillet1.jpg[/img]

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Post by FluxNZ » Fri Nov 01, 2013 11:02 pm

Does that spur mount to a HB diff housing?
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Post by lizard » Sat Nov 02, 2013 1:31 am

so only the ring gear of the HPI bulletproof diffs is machined? That's an interesting piece of info, thanks for sharing.

Regarding the CEN ring and pinion in combination with hellfire housings: Did that really fit? With Savage diffhousings the screwholes don't line up with CEN ring gears.

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Post by johny723 » Sat Nov 02, 2013 7:34 am

You got a point that a diff case can melt, but that holds true for the center diff only, as F/R diffs work only during steering, so there is not much diff action taking place here . the center diff with a thin oil can spin excessively  due to a powerful motor, so replacing a vorza case with a cen gst one or even a stock savage one made of aluminum is a good idea, but I would not go too far and replace all diff cases .  Just my 2 cents

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Post by LLkoolskillet » Sat Nov 02, 2013 8:21 am

[quote="FluxNZ";p="874380"]Does that spur mount to a HB diff housing?[/quote]

You bet it does, I have an HB 46t spur on the vorza housing, HB is made by HPI

As for the CEN/Helfire diff.... taken from my 50mph thread

"I pulled a Hellfire Diff apart and took the plastic cup off. BINGO!!! It works and the diff housing has a super tight fit inside the CEN ring gear. Which is another major plus. The next bonus is the Hellfire cup uses and 8mm bearing :D So now I have two 8mm bearings just like the Vorza mod. So I have completely eliminated the weight of the CEN diff and added 15% taller gearing :twisted: Basically the truck is now geared for 61mph

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The new custom CEN/Hellfire diff

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Next to the sintered BP diff

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Image"
[img]http://i1105.photobucket.com/albums/h358/LLkoolskillet2/skillet1.jpg[/img]

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Post by FluxNZ » Sat Nov 02, 2013 3:01 pm

Gives me a headache looking at all these options :)

The CEN diff setup will be the next setup I'll choose if anything fails.
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Post by LLkoolskillet » Sat Nov 02, 2013 7:29 pm

That's the best part about this hobby, it's always evolving and people combine new things
[img]http://i1105.photobucket.com/albums/h358/LLkoolskillet2/skillet1.jpg[/img]

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Post by FluxNZ » Sat Nov 02, 2013 7:48 pm

Yeah for sure every bit of help makes it a bit easier to get results.

At the moment I'm watching the piggy bank choosing where the money is going at the moment so it's a little slow going.

Small up date I got around to sorting the Baja 5SC body (mold for the vacuum forming). I had to dig out some of the polystyrene to get at the voids that was between the body and polystyrene where the expandable foam didn't fill properly. That current body you have seen on the truck is a defective due to the mold compressing in the vacuum process (voids) so there are creases in the plastic from the plastic folding over itself.

Image

Put some bracing across the centre to make sure it doesn't collapse again and filled the voids with new foam:
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Post by johny723 » Sat Nov 02, 2013 8:06 pm

LL, is it possible to put a BP ring on a cen diff?

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Post by FluxNZ » Sat Nov 02, 2013 9:46 pm

I think you gotta bore new holes in the ring gear to align with the holes on the CEN housing but your good at modding parts Johny :wink:

While blobbing out in the sun I played around with the Super 5SC side body mount to see if I could mount it up to the TVP. There are a couple of holes on the TVP that will line up pretty close which I can use. Had to stagger the horizontal support so I could align with the holes. Brackets will have to be made up so the bottom point have something to hold onto. Good thing that you can get away with a bit of flex in the plastic so things line up
Last edited by FluxNZ on Sun Nov 03, 2013 3:12 am, edited 1 time in total.
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Post by LLkoolskillet » Sat Nov 02, 2013 10:42 pm

No the bp ring gear will not fit the CEN housing. I tried :(
[img]http://i1105.photobucket.com/albums/h358/LLkoolskillet2/skillet1.jpg[/img]

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Post by FluxNZ » Thu Nov 07, 2013 4:07 pm

New pinions have arrived so will do some testing over the weekend and may have a new video up of it running if I get rid of the cogging.
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Post by FluxNZ » Fri Nov 08, 2013 12:51 am

Found out tonight that the centre diff is binding a little which is due to me altering the CAD file when I had the 2028 motor plate machined so the bolts would have enough clearance on the diff to clear the bracket (bolts that hold the 50T spur to the cup). It's not too bad but not something I wouldn't want so I'll still test it with the smaller pinion to get thing's running. The new V2 TVP has adjustment slots for this which I allowed for but not in the current design (kind of having to make adjustments as I go with this project :roll: )
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Post by johny723 » Fri Nov 08, 2013 3:11 pm

what exactly binds? does it rub against the mount?

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Post by FluxNZ » Fri Nov 08, 2013 3:37 pm

No it's just a tight fit between the two plates so pressure is put on the bearings. Could go down to the 46T (doesn't bind) spur I've got but little worried the cup will hit the motor. Will be having a look at it later today. I was running the 50T spur when using the truck in 2WD which had very slight clogging.
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Post by johny723 » Fri Nov 08, 2013 5:28 pm

Did you try a 8x16x4 bearing instead of the 8x16x5? I think it should do the job if you put it on the side opposite to the spur

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Post by FluxNZ » Fri Nov 08, 2013 5:33 pm

That's a good idea so will do that later if needed. I notice that I was using a 48T spur when running 2WD and had put a 46T on with the last setup so I have changed over to 48T which doesn't bind like the 50T does between the plates which will help with the smaller pinion. Will see how it goes later just working on it at the moment.
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Post by FluxNZ » Fri Nov 08, 2013 9:29 pm

Played around with the truck for awhile. Doesn't cog as much but the throttle/braking response is very inconsistent so sometimes it will brake hard or soft even with braking set at 100%, makes it hard to judge how much you depress the throttle. You can apply a lot of throttle at start off but there is a rolling delay then kicks in which can be seen in some of the footage. In other words it's not that nice to drive compared to the MMM in my 1/8 Savage Flux. The MMM is very smooth compared to this and responds to whatever throttle/braking you input instantly.

Starting to look like this XL2 isn't 100% right.

[youtube]http://www.youtube.com/watch?v=FotaVQwg ... e=youtu.be[/youtube]
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Post by FluxNZ » Wed Dec 11, 2013 2:28 pm

Sorry for the long time no update been waiting on the parts to come in.

3 CEN GST differentials. One for the centre diff mounted with the 54T spur and the others are for the front and rear diff's whenever the current ones fail. 1000000 oil for the centre diff. Will try over the weekend to get it up and running.

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