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Old 08-02-2014, 06:31 AM   #436
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Hi all, I'm new to RC and have just brought the XI Sport. I know next to nothing about gear ratios and need some help in selecting a pinion gear. The motor I will be putting in is a sensorless HPI Vector 5900KV brushless running 2C lipos. No plans on racing at this stage, just running around netball courts and getting used to driving in general. Also if anyone could point me in the right direction for some info on gear ratios,that would be great.
BTW the motor is out of a HPI Sprint 2 which had a pinion of 23/48pitch and spur of 90/48pitch and the motor only got warm after running.
Thanks in advance.
Be careful running a belt driven car where there are small stones. The stones/pebbles will destroy your belts....
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Old 08-02-2014, 05:51 PM   #437
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I now have a cordless blower (cost arount $60) which clears things pretty quickly. With my Sprint 2 i never had any problems with the belts but would get pebbles stuck in the spur gear, so i made a little cover out of a plastic cup which helped alot. I see alot of people running their belted cars on the street and then complain that the manufacturer made a crap car because it tears up belts like no ones business.

In regard to which pinion gear to use, my sprint2 used a 23 pinion and 90 spur with a internal gear ratio of 2.13 so 8.33 and XI would be 23/87*2=7.56 so i think things will be ok. I will just keep an eye that nothing gets too hot and adjust gears to get the speeds i need.
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Old 08-03-2014, 07:16 PM   #438
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If anybody is looking for a Sakura Zero got a nice one for sale

Sakura Zero
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Old 08-05-2014, 03:12 AM   #439
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Save me looking through this entire thread, has anyone had problems with the belts being stiff? Like when I rotate the spur it takes a bit of force to turn it, from what I can see it's not binding anywhere? Hmm
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Old 08-05-2014, 07:44 AM   #440
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ur belts might be set too tight, loosen them up a bit and see if that helps.
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Old 08-05-2014, 07:48 AM   #441
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What's better for this car, Front Solid Axle or Front One Way
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Old 08-05-2014, 10:54 AM   #442
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As far as I know only drifters use the front one way, so that braking only affects the rear wheels (like a hand brake).
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Old 08-05-2014, 11:03 AM   #443
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on very big flowing tracks(1/8 scale) a one way will be faster* in slower classes, for everything else go with a spool.

*if you know what ur doing
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Old 08-12-2014, 05:07 PM   #444
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Just got back from an asphalt race in Vancouver Canada. My Xi got into the A main of VTA. Only got C main in 17.5 stock, but I think tire choice played a big role in that result (should have used 36 instead of 32).

I also did a 3 hour electric Enduro with my Xi that weekend. Consistent run, without a single broken part. How's that for a stress test! Should have used a strategy of 5 batteries, instead of just 3. but otherwise, this $90 car held up very well.
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Old 08-15-2014, 11:27 PM   #445
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Anyone got a setup for VTA they would like to share? Also gearing for the new 25.5 motor?

Thanks,
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Old 08-16-2014, 11:31 AM   #446
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Quote:
Originally Posted by SRC_DRIVER View Post
Anyone got a setup for VTA they would like to share? Also gearing for the new 25.5 motor?

Thanks,
Try this: http://www.tqrcracing.com/rc_tools/m...ew.asp?s_id=44
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Old 08-18-2014, 03:49 PM   #447
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I also used vta spec tires. But my springs are:

-3racing 5.5 in front, 3racing 7.0 in the rear.
- Thinnest swaybar on the back, second thinnest in the front.
- 45 weight team associated oil and 3 hole pistons all around.

I keep the top plate screws snug, and then loosen them by half a turn. Also i do not run the aluminum crossbars on the top of my bulkheads.
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Old 08-27-2014, 05:30 AM   #448
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I just picked up a kit and from reading this thread, specifically about the front arms being weak at the stabilizer link. Is the best setup to just build it with the zero arms and stabilizer kit? Thanks
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Old 08-28-2014, 04:45 AM   #449
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Bump
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Old 08-28-2014, 09:31 AM   #450
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I used to do this. But now as I crash less, the regular arms seem fine. I did a 3 hour endurance race with my xi and not a single thing broke.

As the parts are dirt cheap, I would recommend you buy sets of both arms. The swaybar fix is as simple as choosing to slide a ball end, or a ball cup to the ends of your existing swaybar.

Once you are comfortable with one, you will likely disregard the other.
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