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Old 06-30-2009, 02:58 PM   #286
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Anyone tried F103rs rubber tires in the F104 PRO ?
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Old 06-30-2009, 03:40 PM   #287
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One more question (not really, I am sure I will have a lot more). If I convert to 64 pitch, what might be a good starting point for Spur size/pinion size when running 17.5. I might aleady have the gears I need.
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Old 06-30-2009, 04:39 PM   #288
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One more question (not really, I am sure I will have a lot more). If I convert to 64 pitch, what might be a good starting point for Spur size/pinion size when running 17.5. I might aleady have the gears I need.
roll out the car pretty high. I would get a 80-88 t spur. you're gonna need a good sized pinion. In 12th scale, they have run as high as 80mm rollout, but that is with 4 cell. Try around 50mm and work your way up.
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Old 06-30-2009, 06:03 PM   #289
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When I was with my F103GT, I raced with 7.5R. It's a matter of getting used to.

In my opinion for gearing ratio for your 17.5R, you can do 75T (Spur) with 24T (Pinion) for a start. Try it on the straight at your preferred track and see if the car reaches top speed (by listening to the sound, or by the feel of your throttle) right after the halfway point (Straights only, do choose the longest straight, if there are a lot of it at your track). If your car reaches top speed before the halfway point, gear up in your pinion gear. Reason being that if your car reaches top before the halfway, over a period of time, the motor will give way. So nurse your motor, as well as your ESC.

Try asking your friends to see if they lend you the pinions to test-drive, before you commit to the gear ratio by buying the pinion you like. Oh yeah, Go get those Spur Gear Adaptor (ring thing) and that allows you to fit any 64p or 48p spurs in the market. If you get the 3Racing ones, remember to shave a fraction off the width. They are too broad to make the diff work.

Hope it helps!
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Originally Posted by svines1972 View Post
94eg - Do you know what spur the kit will have? And what pinions would be a good starting point for 17.5?

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104t and 93t spurs and a 25t pinion...same as the F103R. Gear for your straight. The 17.5 is a LOT of motor in this car and can be a bit much if ogeared to high. Just make sure you gear it to stop pulling about 3/4 or so down the straight...anymore and it will be difficult to drive consistently.
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Old 06-30-2009, 07:25 PM   #290
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What's the advantage of the aluminium motor mount?, Looks liek a lot of people are fitting them right from new.

Is it just looks?, Is the motor mount a weakness? (and how would anyone know at this stage?)
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Old 06-30-2009, 07:32 PM   #291
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The easier and "no-money-involved" method is to make a hole big enough for the 1280 bearing to be fitted in the centre, with a reamer or a drill bit.

But of course, you will have to be able to part with the fact that this method defeats the use of the spur gear for other cars.

Just make sure that the hole that you make is not too big. A little loose is fine, because ultimately, it's the diff plates that's holding on to the diff balls, and not a solid axle setup.

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Originally Posted by Solara View Post
Yo...see the link below, the little plastic O-RING is the adaptor, with that O-RING, you can use all the 64P spur gear from robinson or kimbrough...etc

http://www3.towerhobbies.com/cgi-bin...?&I=LXN136&P=7

Or use the 3-Racing one..

http://rcmarket.com.hk/product_info....oducts_id=4652

http://www.rcmart.com/catalog/rc-f10...1-p-27621.html
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Old 06-30-2009, 07:34 PM   #292
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It warps, under direct heat (which is coming from your motor, if not from your local climate).

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Originally Posted by Metla View Post
What's the advantage of the aluminium motor mount?, Looks liek a lot of people are fitting them right from new.

Is it just looks?, Is the motor mount a weakness? (and how would anyone know at this stage?)
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Old 06-30-2009, 10:55 PM   #293
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I checked Gearchart.com and with a 78/27 the gear ratio is 7.51. Does this sound about right? Rollout will have to wait until i can get the measurement for the tires.

Last edited by svines1972; 07-01-2009 at 04:51 AM.
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Old 07-01-2009, 02:28 AM   #294
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For me, I find that the rollout is too much to catch up on. The diameter is constantly changing every single pack of runtime. So I use the track to gauge my gearing, and at the same time, check to make sure that the motor does not overheat at all, though sometimes I tend to overgear to get the high-speed adrenaline.

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I checked Gearchart.com and with a 78/27 the gear ratio is 7.51 using. Does this sound about right? Rollout will have to wait until i can get the measurement for the tires.
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Old 07-01-2009, 03:11 AM   #295
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Has anyone fitted the cheap tamiya brushless TBLE-01 speedo? does it fit ok?
Or what brushless speedos are people using?

Thanks
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Old 07-01-2009, 05:44 AM   #296
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Originally Posted by alan1467 View Post
Or what brushless speedos are people using?
I've put a Novak GTB in mine. The wiring is tight (and might need to be fine tuned), but definitely manageable. It's driving a 17.5T brushless, so I've removed the fan to keep the profile down a bit. I haven't fitted the side pods, since I decided I liked the slimline look and the fan would have been largely ineffective against the side of the body.

Had it's first run last night at our club track (smaracing.org) with a field of F1's, mostly F201's. It's an outdoor track and I was a bit terrified about a lack of grip in cooler air (well, cooler for Sydney), but it hung in quite well for it's first public display. I was under-driving it quite substantially, but the main thing: it was a lot of fun!
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Old 07-01-2009, 08:36 AM   #297
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Hi!

Did your GTB protrude out? I tried putting my GTB but it's like not meant for that tight space.

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Originally Posted by PDR View Post
I've put a Novak GTB in mine. The wiring is tight (and might need to be fine tuned), but definitely manageable. It's driving a 17.5T brushless, so I've removed the fan to keep the profile down a bit. I haven't fitted the side pods, since I decided I liked the slimline look and the fan would have been largely ineffective against the side of the body.

Had it's first run last night at our club track (smaracing.org) with a field of F1's, mostly F201's. It's an outdoor track and I was a bit terrified about a lack of grip in cooler air (well, cooler for Sydney), but it hung in quite well for it's first public display. I was under-driving it quite substantially, but the main thing: it was a lot of fun!
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Old 07-01-2009, 08:45 AM   #298
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Has anyone else tried adjusting the ride height at the front end of the car? I lowered the front of the chassis by rearranging the spacers on the king pins and it really through the steering links up to a steep angle. The result was major bump steer. I was thinking of using the shorter/smaller servo horn but I know this will change the ackerman. Does anyone have any comments or suggestions?
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Old 07-01-2009, 09:45 AM   #299
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Here is a picture is what I’m talking about. This shows the steering links at the recommended stock locations. By lowering the chassis this raises the front axel and makes the links attach at a steeper angle.

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Old 07-01-2009, 09:47 AM   #300
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Quote:
Originally Posted by Vyger View Post
Has anyone else tried adjusting the ride height at the front end of the car? I lowered the front of the chassis by rearranging the spacers on the king pins and it really through the steering links up to a steep angle. The result was major bump steer. I was thinking of using the shorter/smaller servo horn but I know this will change the ackerman. Does anyone have any comments or suggestions?
maybe spacers under the steering linkage mount at the knuckle end
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