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Most of us are running 64 pitch gearing. You can get spurs down as small as 76 and 72 teeth with the ball holes that suit large diff rings. I've used spurs from RW and PRS, both make good stuff.
For pinions, PRS or BMI will have a good selection. I was running 48/76 with my 17.5 4 cell car. |
Originally Posted by RaceBucks
(Post 5596619)
Need some help gearing a 17.5T right.
I'm getting back into 1/12 after a several year absence, looking to run the 17.5T class and have a 12L3. With my motor pressed up against the t-plate, I can't find the spur/pinion to fit in the space to give the 85-95mm+ runout that I hear these motor want. If I stick with 48P, the smallest spur I find is 65T with the holes for the large diff rings that I have; I have seen a 60T but it only has holes for the small diff rings, but I can't seem to find small diff rings being sold, plus I think I'd need a few other parts. So then the largest pinion that I can shove in is a 27T with the 65T spur or 32T if I find small diff rings and can use the 60T spur. So best I seem to do is a 63mm runout with the 65T/27T or maybe 80mm if I find a way to use the 60T/32T combo. During searches I saw mention of different pods for brushless; is this what people are doing to get more room? If they are creating a longer pod for more clearance, wouldn't that screw up the wheelbase so bodies wouldn't fit? I see a new pod mentioned on the CRC web site but it doesn't look like it's for a t-plate car. If this is the solution who's making a pod for a t-plate? People must be doing this, I saw that IIC'08 had an entire class of 17.5T 1/12ths. How are people doing this? Thanks, Jeff Smith You will have a very hard time; if at all possible; setting up a spec brushless in a 12l3. As brushless has overtaken the hobby the car builders have made the pods longer; and in the case of new brushless centered pods shifted them slightly to the drive side. This is offset by shortening the main chassis so the overall length has stayed close to the same. |
I have a 12l4w my rollout is 1.43-1.49 can I only use 64 pitch first of all and what is the spur and pinion :tire:
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Where's Scott he's the resident mathmatican, but I think we need the tire size in order to work the math:confused:.
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Originally Posted by RaceBucks
(Post 5596619)
Need some help gearing a 17.5T right.
I'm getting back into 1/12 after a several year absence, looking to run the 17.5T class and have a 12L3. With my motor pressed up against the t-plate, I can't find the spur/pinion to fit in the space to give the 85-95mm+ runout that I hear these motor want. If I stick with 48P, the smallest spur I find is 65T with the holes for the large diff rings that I have; I have seen a 60T but it only has holes for the small diff rings, but I can't seem to find small diff rings being sold, plus I think I'd need a few other parts. So then the largest pinion that I can shove in is a 27T with the 65T spur or 32T if I find small diff rings and can use the 60T spur. So best I seem to do is a 63mm runout with the 65T/27T or maybe 80mm if I find a way to use the 60T/32T combo. During searches I saw mention of different pods for brushless; is this what people are doing to get more room? If they are creating a longer pod for more clearance, wouldn't that screw up the wheelbase so bodies wouldn't fit? I see a new pod mentioned on the CRC web site but it doesn't look like it's for a t-plate car. If this is the solution who's making a pod for a t-plate? People must be doing this, I saw that IIC'08 had an entire class of 17.5T 1/12ths. How are people doing this? Thanks, Jeff Smith I currently have a 12L4 built up with BL in it using this LRP part... http://67.199.85.166/main/productdet...ory=6001xxxxxx ...and the motor fits the pod without any problems. HTH :) |
Hi guys, I thought I'd post a pic of the track that we raced on last Sunday. This was the last round of our SW Winter Series. TQ was 42 laps. Cheers, Chris.
http://i726.photobucket.com/albums/w...ay22_03_09.jpg |
What are the brushless mod motors of choice these days for 1:12? LRP X-12, Trinity Pulse??? Looking to buy a 4.5 and 5.0.
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Originally Posted by RaceBucks
(Post 5596619)
Need some help gearing a 17.5T right.
I'm getting back into 1/12 after a several year absence, looking to run the 17.5T class and have a 12L3. With my motor pressed up against the t-plate, I can't find the spur/pinion to fit in the space to give the 85-95mm+ runout that I hear these motor want. If I stick with 48P, the smallest spur I find is 65T with the holes for the large diff rings that I have; I have seen a 60T but it only has holes for the small diff rings, but I can't seem to find small diff rings being sold, plus I think I'd need a few other parts. So then the largest pinion that I can shove in is a 27T with the 65T spur or 32T if I find small diff rings and can use the 60T spur. So best I seem to do is a 63mm runout with the 65T/27T or maybe 80mm if I find a way to use the 60T/32T combo. During searches I saw mention of different pods for brushless; is this what people are doing to get more room? If they are creating a longer pod for more clearance, wouldn't that screw up the wheelbase so bodies wouldn't fit? I see a new pod mentioned on the CRC web site but it doesn't look like it's for a t-plate car. If this is the solution who's making a pod for a t-plate? People must be doing this, I saw that IIC'08 had an entire class of 17.5T 1/12ths. How are people doing this? Thanks, Jeff Smith I think you should be ok. You will have to go to 64 pitch because I think it would be hard to find 48 pitch gears as small as some of the new 64pitch gears. i think 72 is about as small as you can get. also remember that you need to probably bevel your t-bar. that will get you a couple 3 teeth more. I think I was able to get a 96/40 into the l4 so you should be able to get 76/54 which is probably the tallest you will see with a 17.5 unless we are talling 1s lipo. then i think we will se 72/72 some day |
Originally Posted by jdeadman
(Post 5596607)
I have browsed thir site and cannot find any refrence to that 1/12 rear wheel brace
do you have a link to the product or it's number? AMC in the UK sell the Fibrelyte wheel spacers and front ride height spacers. http://www.actionmodelcentre.co.uk/products.asp?cat=250 BTW one of the best 1/12th scale shops. I have ordered from them 2 times now. |
Hi guys, could anyone identify what this chassis is please? Neat idea of joining the pod to the main chassis plate but who's design is it? Cheers!
http://i726.photobucket.com/albums/w...9/unknown2.jpg http://i726.photobucket.com/albums/w...09/unknown.jpg |
Interesting. Essentially a three link with a panhard bar.
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The chassis design was originally done by Matt Bouchet, who originally designed the car on his own during the time we ran brushed motors. That car is the joint effort of Matt and Team Kwik. Nick from team Kwik decided to surprise Matt at the IIC this year with that built show car.
Matt Bouchet, a senior at UNH studying mechanical engineering died at age 22 in September. He had been battling cancer. That car still sits hanging in Nick's bench at the local track. There aren't any plans currently to pursue it. |
Very nicely done, looks the same as the design I'm doing atm.
Especially the rear damping looks good, thats the thing I'm having problems with. Sad to hear the designer passed away at such a young age.... |
Originally Posted by theisgroup
(Post 5601191)
I think you should be ok. You will have to go to 64 pitch because I think it would be hard to find 48 pitch gears as small as some of the new 64pitch gears. i think 72 is about as small as you can get. also remember that you need to probably bevel your t-bar. that will get you a couple 3 teeth more. I think I was able to get a 96/40 into the l4 so you should be able to get 76/54 which is probably the tallest you will see with a 17.5 unless we are talling 1s lipo. then i think we will se 72/72 some day
I found some small D-Rings, turns out the TC3 diff's use them so I had them already. With that I was able to put a 48P 60T spur on and with a 17.5T brushless mounted all the way up against the t-plate I could fit a 38T pinion. This makes a 96mm rollout, perfect for the 85-95mm rollout range I'm hearing the 17.5T's want. So I'm building a 12L3 with a 35T/60T, 90mm rollout, 17.5 brushless. New Huntington Beach California track opens in 2 weeks; getting excited. |
Thanks for the reply regarding the chassis's in the pics. I have seen this type of thing done in a bigger class but not on a 12th car. Sorry to hear the news about the designer though, not good at all.
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