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Old 01-14-2010, 12:19 AM   #1
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Default need help with my xray t2 008

ok here what i need help with :

i'm running an 17.5 class. i'm the slowest on the straight a ways!

i have an 17.5 duo-2

navok gtb

an 30t pinion ( the biggest one i can fi

Last edited by reryk69; 01-14-2010 at 01:14 PM.
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Old 01-14-2010, 12:21 AM   #2
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Quote:
Originally Posted by reryk69 View Post
ok here what i need help with :

i'm running an 17.5 class. i'm the slowest on the straight a ways!

i have an 17.5 duo-2

navok gtb

an 30t pinion ( the biggest one i can fit in it)

85 spur

20t pulleys

34 diffs

and come off the track after an 6 min heat with temps of 100 for the esc an 95-105 on the motor so i have the temps to gear up but i just don't know where to start and how the get my car faster i'm way slower then all i race with.

thank you for all the help i may get.

and for even looking at this post

thanks eryk
Those temps are Fahrenheit yeah? If so, when I was running 17.5 on a hot sunny day with a fdr 3.8 the temps were around 68- 70. Myabe you could start from there.
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Old 01-14-2010, 02:25 AM   #3
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Maybe its time to change to a newer esc with advanced timing. eg tekin or team wave rbs. These esc can make your 17.5 speed like a 13.5. Check whether your competitors r using these esc's.
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Old 01-14-2010, 02:59 AM   #4
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ditto, the problem is your ESC and it only has fixed timing. BUY A NEW ESC WITH ADVANCED TIMING. like SPX/Nosram stock spec/mamba max pro/GM 120 etc......tekin ...
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Old 01-14-2010, 03:06 AM   #5
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Dude i'm in the same position, it's your speedo i'm running (was running) the 10.5 ss package and am about to buy a tekin rs for the very same reason. The gtb is very reliable but just doesn't cut it anymore, i'll be keeping it in my pit box for that life saving moment though!!
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Old 01-14-2010, 03:25 AM   #6
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GTB is still good for mod racing (5.5R or less). For Stock racing... it has no match.

reryk69:
you can get a smaller spur, like 78 and pair it with 30/31/32. (with smaller spur, you can fit a larger pinion)

Perhaps you can turn up the physical timing on your duo2 (if it's possible).... that's about as much as you can do.

As long as your temp is <160F or <70C, the motor is fine.
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Old 01-14-2010, 03:36 AM   #7
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^^^^^ what the guy above me said..... you can gear up by getting a smaller spur and keeping the same or going larger on the pinion....

Advanced timing is most liekly the reason you are slowest in the straights..... Unless no one else is running advanced esc's...... Then you just need to gear up and keep it off the walls.
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Old 01-14-2010, 05:31 AM   #8
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If you can keep up very well in the infield and lose on the straight then I suppose the others are right and indeed you need a technological upgrade. try gearing up and see if you start slowing down in the infield because of the higher gearing. If you don't then keep gearing up until you do and then compare your main straight speed against the others. If temperatures go up and infield speed goes down, well, here's your answer.
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Old 01-14-2010, 11:27 AM   #9
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ok gear up is more in my pocketbook right now. can it use the 32 diffs (front and back) i have in place of the 34 (front and back) i have installed right now. i will look for a smaller spur but i will try the 81t that should come in today.

thank you all for your help and if you have a idea to help that would be great i still need to know if the 32 diffs should be installed?


eryk
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Old 01-15-2010, 09:43 PM   #10
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ok gear up is more in my pocketbook right now. can it use the 32 diffs (front and back) i have in place of the 34 (front and back) i have installed right now. i will look for a smaller spur but i will try the 81t that should come in today.

thank you all for your help and if you have a idea to help that would be great i still need to know if the 32 diffs should be installed?


eryk
If you can find shorter front and rear belts, then 32 diff can be installed. Although xray do not have such belts.

Officially, xray only has 3 gear combos: 38/16 (2.375), 34/20 (1.7) & 38/20 (1.9)

Ideally, you dont want to run the pulley too small, because the belt may skip and smaller pulleys will put more work on the motor.
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Old 01-15-2010, 11:57 PM   #11
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thank you. today i put in an 81t spur (but had oter things happen is i only get 8 mins of run time.. no i don't hit the walls ,at lest i didn't today and i don't hit them as much as i did one year ago) any way my point is i found out that my pulleys are 21.. no for real 21 no the main shaft that has the spur gear on it!

it did seem a little faster. i only got to try one pinion but maybe next time i can try more

thank you to every one that has helped.

any one have an tekin rs/ rs pro that they want to give away? or at lest almost give away?
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