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Old 08-10-2010, 08:46 PM   #2791
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spec-r is the easiest route for running a gear diff in the car..

ive been running one for a few weeks now and have not had a problem with it..
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Old 08-10-2010, 09:46 PM   #2792
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Just went over the car one more time, i might have the ackerman setting off, since the steering arc from off to on was not consistent, will have a play with that tomorrow...
Simple. Because the link from the servo arm goes downward to the steering linkage, set the turnbuckle link at a 90 degree angle to the servo arm when the steering is centered on zero toe. To do this, the servo arm will be slightly angled forward to achieve the correct geometry...For me, the servo arm was basically one tooth clockwise on the toothed output shaft of the servo (in neutral position).

And you will have to shorten the linkage ball ends a bit to reduce the overall length of the turnbuckle. With the aforementioned 90 degree angle, adjust the turnbuckle length to get the steering dead straight.

With this geometry, you will have equal left/right steering throws. Just watch the linkage move without the battery being in place and you'll see. My steering balance is set to 100/100. Money!
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Last edited by Still Bill; 08-10-2010 at 10:42 PM. Reason: Clarification
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Old 08-10-2010, 10:28 PM   #2793
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Anybody have a equality chart for the "C" type springs verses "color" springs?
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Old 08-11-2010, 03:14 AM   #2794
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It depends, a stiff spring can cause the front tires to over heat a few mins into the race which will make your car push
Yes, I get that one, becasue i've had it, but I actually find that to be the opposite with the flex. For example, when I use to much flex at front, which overheats the fronts, the car has violent snap oversteer.
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Old 08-11-2010, 11:32 AM   #2795
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Yes, I get that one, becasue i've had it, but I actually find that to be the opposite with the flex. For example, when I use to much flex at front, which overheats the fronts, the car has violent snap oversteer.
balance, you now have more front than rear grip
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Old 08-11-2010, 11:48 AM   #2796
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Anybody have a equality chart for the "C" type springs verses "color" springs?
Here you go.

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Old 08-11-2010, 03:38 PM   #2797
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XRAY Column #45 - Electric Touring Worlds is currently available on the TeamXray web page.

As mentioned before, a narrower LiPo chassis with battery hold down and a double steering system were tested on the T3. There was no mention of a gear diff test.

It appears the the XRAY racers at Jackson R/C in New Jersey have been doing more testing and have more advanced T3's than the world team. (We will be testing and racing a double gear diff in Mod this weekend.)

As mentioned in the article, it appears that the European team has been experiencing a few rounds of bad luck in all the summer events. It is refreshing that Paul Lemieux and Ralph Burch have stepped up from the US team and contributed very important national titles (Reedy, ROAR) and a IFMAR World title.
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Old 08-11-2010, 03:42 PM   #2798
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XRAY Column #45 - Electric Touring Worlds is currently available on the TeamXray web page.

As mentioned before, a narrower LiPo chassis with battery hold down and a double steering system were tested on the T3. There was no mention of a gear diff test.

It appears the the XRAY racers at Jackson R/C in New Jersey have been doing more testing and have more advanced T3's than the world team. (We will be testing and racing a double gear diff in Mod this weekend.)

As mentioned in the article, it appears that the European team has been experiencing a few rounds of bad luck in all the summer events. It is refreshing that Paul Lemieux and Ralph Burch have stepped up from the US team and contributed very important national titles (Reedy, ROAR) and a IFMAR World title.
what weight are you going to start off with in the front? i have a extra diff im considering doing the same thing to at jackson this weekend..
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Old 08-11-2010, 03:58 PM   #2799
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what weight are you going to start off with in the front? i have a extra diff im considering doing the same thing to at jackson this weekend..
We have about 15 bottles of different XRAY oil weights from 350 - 100,000. Randy did an all nighter last weekend and must of rebuilt the gear diff a dozen times with different oils and oil levels. It feels nice and tight now, yet smooth to the twist test. I will PM you tonight with the final oil when he gets home.
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Old 08-11-2010, 09:38 PM   #2800
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Hi .... some major progress today, started to clip apexs now and getting faster laptimes.

Am havin some stability issues when clippin apexs now, up to the point that I have to be so careful not to push the limit to far and risk flippin over.

Am guessin yes am traction rollin, so maybe shortening the camber links to avoid it, but this traction rolling is not related to high grip so much but more of the car being offset by an apex....

Yss i could avoid them, but the point is to get faster....

Any tips or ideas guys ...?
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Old 08-11-2010, 09:43 PM   #2801
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Hi .... some major progress today, started to clip apexs now and getting faster laptimes.

Am havin some stability issues when clippin apexs now, up to the point that I have to be so careful not to push the limit to far and risk flippin over.

Am guessin yes am traction rollin, so maybe shortening the camber links to avoid it, but this traction rolling is not related to high grip so much but more of the car being offset by an apex....

Yss i could avoid them, but the point is to get faster....

Any tips or ideas guys ...?
go wide -- shim that car out. go to 2.25mm front, and add an extra 1.5mm shims at the back arms to both the front and rear of the arm holders. making the car wider will help with stability.

make sure you clean your tires after each run with motor spray to keep a consistent grip level... otherwise you'll find the tires getting stickier and stickier over the course of the day.

if you feel the front end is rolling too much also look into adding some anti-dive. since your running with so much horse power, when you lift into sweepers there is a probably a big weight shift forward.
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Old 08-11-2010, 09:44 PM   #2802
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One more question going over this weight balance issue i ordered the xray weights, turns out they wont fit on the t3 anyone made any mods to have them fitted ?

Am using the stick on ones, since I also do rc helicopters and know how important the CG of the heli, other then balancing the car in a vertcal line from side to side, can one attempt to balance the car horizontally to have equal weight distribution front and back and if I was to do that, what would be the reference point or is this factor irrelative.

Reason am asking is cause knowing a T3 with an 84 pitch gear would handle differently on the steering say using a 115 teeth spur, just by havin the motor sittin upfront closer.
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Old 08-11-2010, 10:16 PM   #2803
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Am thinking electronic food scale on all four tires ?
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Old 08-11-2010, 10:27 PM   #2804
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Am thinking electronic food scale on all four tires ?
you can pull off the balance with two scales, and two equal weight beams. you use the beams to support either the left/right side, or the front/back on the two scales.

i've been running with about a 15 gram heavier front end, and a 10 gram heavier left side. i could worry about moving more weight around, but it doesn't seem worth it. the weight on the front of the car makes it a little easier to drive, but reduces reaction times slightly.
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Old 08-11-2010, 10:31 PM   #2805
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Thx for the help bro...
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