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Old 05-06-2003, 09:19 AM   #1306
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Default Re: Re: Re: Re: Punisher or Pit Racer!!

Quote:
Originally posted by InitialD
I think www.gasrccar.com sells them. Look for Impact aluminum pulleys. I believe it is USD 13 per piece.
Paul,

I think InitialD have direct you with the right website where u can get it. I believe that website have the latest Alu. Pulley for the brake.

I got mine from ebay sometimes back when it was still price OK at about 30~35 bucks shipping included, for total of 7 pulleys (5 for the car and 2 extra optional pulleys like 23T Side middle and 19T Rear Side).

But the Brake Pulley are meant for the Impulse shaft, using pin instead of grubscrew to lock the pulley. So i've to do some modification on the brake pulley to fit the 705 shaft using grub-screw.
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Old 05-06-2003, 10:06 AM   #1307
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Nizeee,

GP makes an 800mah battery. The only place I found them was on ebay.
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Old 05-06-2003, 10:14 AM   #1308
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Default 800mAh Battery

Quote:
Originally posted by JJ187RC
Nizeee,

GP makes an 800mah battery. The only place I found them was on ebay.
Thanks JJ.
Goodness..... its cheaper too!!!!
Heard of NexTel but NexCell battery?
Did you tried it?
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Old 05-06-2003, 05:00 PM   #1309
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Quote:
Originally posted by JJ187RC
Nizeee,

GP makes an 800mah battery. The only place I found them was on ebay.
I use the GP800mah batteries too. They are great. But I guess I am lucky to have a friend who got me them dirt cheap. I made up 2 packs for $15 including wiring and heatshrink
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Old 05-06-2003, 07:05 PM   #1310
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Default Re: 800mAh Battery

Quote:
Originally posted by nizee
Thanks JJ.
Goodness..... its cheaper too!!!!
Heard of NexTel but NexCell battery?
Did you tried it?
Nizee
They said that the GP batteries are ligther than the other ones too!!
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Old 05-06-2003, 07:14 PM   #1311
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Default Re: Re: Re: Re: Re: Punisher or Pit Racer!!

Quote:
Originally posted by nizee
Paul,

I think InitialD have direct you with the right website where u can get it. I believe that website have the latest Alu. Pulley for the brake.

I got mine from ebay sometimes back when it was still price OK at about 30~35 bucks shipping included, for total of 7 pulleys (5 for the car and 2 extra optional pulleys like 23T Side middle and 19T Rear Side).

But the Brake Pulley are meant for the Impulse shaft, using pin instead of grubscrew to lock the pulley. So i've to do some modification on the brake pulley to fit the 705 shaft using grub-screw.
Tnx Nizee,,

hehe!! I forgot that Winners Circle is one of our suppliers here in Puerto Rico, all of our 705's came from Winner's hobbies,, Lee is a very good friend of one of my team mates!!

Last edited by paulfitipauldi; 05-06-2003 at 07:20 PM.
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Old 05-06-2003, 10:23 PM   #1312
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Quote:
Originally posted by InitialD
superk,

Answers to your questions are as below;

1. Yes, the 705 internal drive ratio are the same as the Impulse PRO. On the 705, you have the option to go to a higher internal drive ratio (2.14) by changing some pulleys in the rear which makes for better acceleration especially with the Centax clutch. You can also change the PRO to have higher internal drive ratio like the 705 but this requires more parts to be purchased. It'll be easier since you already have the rear ball diff. If you were still using the rear gear diff, then it will be even more expensive to do it as the rear gear diff pulley does not come in 47T.

2. The 16T/19T will work with the stock 50T/47T. It will mesh but it will not align properly. The official Centax spurs for the 1st gear is 49T, 48T and 47T. The 2nd gear spurs are 44T, 45T and 46T. The Centax pinions are 15T, 16T and 17T for the 1st gear and 18T, 19T and 20T for the 2nd gear.

Since you mentioned that the track you run on is small and technical, the 16T/19T combination may be a little too much for you. You don't get so much acceleration out of the 16T 1st gear pinion. Change it to 15T and you will find that the acceleration is better. For the 2nd gear pinion, 19T is a little high. Change to the smallest 2nd gear pinion which is 18T. You need not to worry about the teeth spread between the pinions and the spurs. To take an extreme example, you can use 15T/19T (4 tooth spread) with 47T/46T spurs and the gears will still mesh correctly.

If you still find that the acceleration is lacking, you can change the internal drive ratio from 2 to 2.14 by changing the side pulley from 18T to 17T, the 23T brake pulley to 22T and the 46T rear ball diff pulley to 47T. You will need to purchase pulley adapters for the 17T and the 22T pulleys if you're using these on the Impulse PRO. If you need the part numbers, please let us know. I think I have them posted in this thread. Have a search and you should be able to find it. Else, just ask

3. Setup? What tires do you run? It depends on a lot of things. I suggest a better way would be to let us know what you are currently running by listing out your car setup and how is the car behaving for you on the track. That way, it would be faster for us to trouble shoot for you and make some constructive advise and suggestions.

Hope that helps.
hi initiald
i saw some of ur postings @ hobbylink regarding gear ratio
im rather new, i dun understand how u guys get the 1:1 overdrive? how do u get the figures? formula?

thx
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Old 05-07-2003, 12:02 AM   #1313
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Quote:
Originally posted by taz5176
hi initiald
i saw some of ur postings @ hobbylink regarding gear ratio
im rather new, i dun understand how u guys get the 1:1 overdrive? how do u get the figures? formula?

thx
Taz, it's pretty simple once you know it. Which part is it are you not clear about?

For easy and quick reference, you can go to this website below;

http://www.home.zonnet.nl/realrolfje...t/overdriv.htm

Play around with figures (take the Impulse as an example) and see how the tire size and pinion / spur ratio will affect the final speed of the car...

For a 3 belted car drive transmission, there are 2 sections to worry about i.e. front and rear. You need to check if your front and rear internal drive ratios are the same. If they are somehow not the same, you'll either get overdrive (front pulling the rear) or the other case would be underdrive (rear pushing the front) assuming that your front and rear tire diameters are the same.

If for some reason your front and rear internal drive ratios are different, you need to play around with the front or rear tire diameters to alter the front and rear tire rollout so that they are the same in the end result. If the front spins more for every engine revolution (i.e. front internal drive ratio lower than rear), you need to use smaller front tires than the rear to make the final tire rollout for the front and rear the same.

Taking the stock 705 / Impulse PRO with 15T/18T pinions and 50T/46T spurs as an example;

Front Internal Drive Ratio = 24/18 x 24/16 = 2

Rear Internal Drive Ratio = 46/23 = 2

Spur / pinion ratio (1st speed) = 50/15

Spur / pinion ratio (2nd speed) = 46/18

Front / Rear Tire diameter = 62 mm (foams)



Final Front Drive Ratio (1st speed) = 2 x 50/15 = 6.67

Final Rear Drive Ratio (1st speed) = 2 x 50/15 = 6.67

Tire Rollout Front (1st Gear) = (pi) x 62 / 6.67 = 29.2 mm per engine revolution

Tire Rollout Rear (1st Gear) = (pi) x 62 / 6.67 = 29.2 mm per engine revolution



Final Front Drive Ratio (2nd speed) = 2 x 46/18 = 5.11

Final Rear Drive Ratio (2nd speed) = 2 x 46/18 = 5.11

Tire Rollout Front (2nd Gear) = (pi) x 62 / 5.11 = 38.12 mm per engine revolution

Tire Rollout Rear (2nd Gear) = (pi) x 62 / 5.11 = 38.12 mm per engine revolution

Both front and rear tire rollouts are equal and therefore, the overdrive is said to be 1:1 i.e. no overdrive. If front tire rollout is bigger than the rear, then it is overdrive. If the rear tire rollout is bigger than the front, then it is underdrive. Some people purposely set the car for overdrive (or underdrive) because it suites their driving styles.

Assuming there is no friction loss in the clutches and the engine is able to rev 36,000 rpm;

Top speed achieved (2nd gear) = 36,000 x 38.12 = 1372320 mm / minute = 82.3392 km/hr

Hope that is pretty clear
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Old 05-07-2003, 01:10 AM   #1314
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thx initiald
tat's very nice info. but can only check out the link u posted when i get home, seems to be blocked by my administrator in office
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Old 05-07-2003, 09:10 AM   #1315
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Default Gear Ratio

taz5176,

InitialD have shown very good example and equations for calculation gear ratio and drive train.

Take all the equation/formula and put it into Excel Spreedsheet and you have your own personal calculator. I compile all the equation/formula into the Spreedsheet and it easy for me to reference back, that's what i did.
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Old 05-07-2003, 09:51 AM   #1316
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http://www.home.zonnet.nl/realrolfj...it/overdriv.htm
i cant access this page, is this link correct?

nizee:
i've already got the spreadsheet up after reading initiald's explaination, cool! he is very active in this forum & always provide great tips & help to those in need

initiald:
btw, r u from sg? i am...
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Old 05-07-2003, 02:31 PM   #1317
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Nizee, where did you get the purple washers for the shock mounts, as well as the brake lever? Tower hobbies has the normal HPI purple concave washers, but I've never seen ones that look like what you have.
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Old 05-07-2003, 05:01 PM   #1318
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Cool

YEAH!
Where did you get those cone shaped purple washers!?!?!?
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Old 05-07-2003, 05:05 PM   #1319
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I'm having a HARD time getting these baloons onto my reciever! Whenever I pull them over the baloon will rip making it impossible to get on. I've tried it so many times and it always rips on the sharp edges. Baloons aren't working out for me, what else can I try? Is there a company that makes specially designed covers for recievers or something? What can I do?

Also, does anyone know of any online hobby shops that have purple fuel tubing in stock? I can't find purple fuel tubing on any of the major online hobby shops like tower, horizon, etc.!
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Old 05-07-2003, 05:27 PM   #1320
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Accord,
you can try useing 1 1/2 wide Heat Shrink Tubing for your reciever.

U can find this stuff at an eletronic store.......
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