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Old 05-01-2003, 07:59 PM   #3601
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Quote:
Originally posted by TBR
I take it this stopper is just a metal version of the stopper than you use from a MTX-2?
they are different, i tried to put a MTX2 stopper to the MTX3 chassis and it just dont fit.
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Old 05-01-2003, 08:06 PM   #3602
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Quote:
Originally posted by RClover
this chassis is too nice and beautifully machined and i hate to say that mine had already scratched...but i would love to have another one for keeping on the shelf for display...
I think I will get the Kawahara 4mm one next !! that could be one year later
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Old 05-01-2003, 08:10 PM   #3603
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Quote:
Originally posted by RClover
ran against another guy who was on Full Diff setup (Front/Rear) with Foam tyres..!! he was blistering fast and i could barely keep up...!
Isnt Full Diff setup works only with rubber tyres? Anyone tried Full Diff setup with foams before? How does the handling differs from One-Way + Rear Diff?
Just ran my MTX-3 with full diff yestereday. The car felt completely different. It felt faster but the timings clearly show I am 0.5 secs slower with full diffs then 1 way.

With full diff, the car felt very stable and I could 'attack' very esaily. the car felt a little understeer thou. Bad point was also the front diff casing were leaking.. now my car is full of diff oils.

front diff 30k/ rear 10k
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Old 05-01-2003, 11:59 PM   #3604
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Quote:
Originally posted by Vinyard
Just ran my MTX-3 with full diff yestereday. The car felt completely different. It felt faster but the timings clearly show I am 0.5 secs slower with full diffs then 1 way.

With full diff, the car felt very stable and I could 'attack' very esaily. the car felt a little understeer thou. Bad point was also the front diff casing were leaking.. now my car is full of diff oils.

front diff 30k/ rear 10k
so, are you the guy rclover talking about?
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Old 05-02-2003, 12:00 AM   #3605
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Default Re: Re: Re: Re: Re: Re: Stopper

Quote:
Originally posted by Manticore
I think I will get the Kawahara 4mm one next !! that could be one year later
by then, i could have sold my MTX-3 for MTX-4
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Old 05-02-2003, 01:40 AM   #3606
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Quote:
Originally posted by jason102276
kfactory makes clutch bell gears up to 23 tooth

i know what hes talking about that track over here in ohio is huge and the mtx2 (which has the same overall internal ratio) was under geared for it

the trinity team had a 23 tooth and they were fine mugen only had a 22 and they were getting killed on the straight thats why mugen did so poorly at nats and worlds

i didnt have even a 22 to run it was horrible i would reach my top speed only 1/3 of the way down the straight

i hope that they even make a 24 tooth in case i go back to that track it was huge
Jason, the NTC3 were all running 21/27 pinions with 54/48 spurs in Ohio. Final drive ratios were 4.44. They had to go with a bigger pinion because they inherently have problems getting high revs on the stock dual chambered pipes. The Serpent on the other hand was runing final drive ratios of about 4.74 with 60 mm tires.

On your MTX-3, a 22T pinion with a 42T spur will give you 4.82 final drive ratio. A 23T pinion will get you 4.61 drive ratio which could be correct for the Ohio track depending also on the tire rollout.

I don't know if making a bigger 2nd gear pinion is technically possible due to size contrains...

What you could do is you could check if the 24T pulley conversion from the V1RR could be used on the MTX-3. It comes with the necessary belts. The 24T pulleys is meant to swap the 19T pulleys on the V1RR. This changes the internal drive ratios to 2. I don't know if they can fit in the MTX-3 which also uses 19T side and 19T brake pulleys. Then the options for gearing are finitely possible to reach with an internal drive ratio of 2.

You also need to check the belting but somebody already mentioned that the side belts for the V1RR and the MTX-3 are identical. Don't know about the rear belt.

I think for those that require huge gearing, changing the internal drive ratio is the way to go.
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Old 05-02-2003, 02:10 AM   #3607
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Quote:
Originally posted by Manticore
so, are you the guy rclover talking about?
dun think so.. i dun even know him ..
dun think he even stay in the same country as me...
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Old 05-02-2003, 02:50 AM   #3608
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Quote:
Originally posted by InitialD
On your MTX-3, a 22T pinion with a 42T spur will give you 4.82 final drive ratio. A 23T pinion will get you 4.61 drive ratio which could be correct for the Ohio track depending also on the tire rollout.

I don't know if making a bigger 2nd gear pinion is technically possible due to size contrains...

What you could do is you could check if the 24T pulley conversion from the V1RR could be used on the MTX-3. It comes with the necessary belts. The 24T pulleys is meant to swap the 19T pulleys on the V1RR. This changes the internal drive ratios to 2. I don't know if they can fit in the MTX-3 which also uses 19T side and 19T brake pulleys. Then the options for gearing are finitely possible to reach with an internal drive ratio of 2.
InitialD:

I didn't raced at Ohio, but went with my car to very huge tracks (Lostallo) and went with 17/21 and 47/42.

Many times we try to get speed putting larger pinions or smaller spurs, but people don't change the pipe (and this is their main problem).

On huge tracks you don't need great low-end, but needs a lot of rpms. put a pipe that gives you rpms and let the engine go sky-high.

On Lostallo needed to put an additional 0.1mm shim on the chamber to provide better high-end to the engine.

Don't noticed the need of going to a 22T pinion on the 2nd gear nor changing the internal pulleys.
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Old 05-02-2003, 03:25 AM   #3609
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Corse-R, don't know about how long the straights of the tracks in Ohio or like what you have been to in Lostallo... But if team drivers found it difficult in Ohio with the existing gearing, then I bet it is a pretty long track. The one in the picture seems pretty huge...

Your solution to long tracks seems to rely heavily on high engine revs... It works but to me, that is a little scary seeing that not every ordinary person would be able to afford replacing conrods, piston / sleeve and crankshafts every now and then. Even then, you need very good high reving engines to be able to pull stunts on the straights which not many ordinary people can afford...

I think changing gearing and internal pulleys is a good way of circumventing the problem.
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Old 05-02-2003, 04:16 AM   #3610
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Old 05-02-2003, 07:01 AM   #3611
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Quote:
Originally posted by TBR
Has any one got there hands on a Kawahara negative diff for the MTX-3 yet? I'm sure I have seen a pic of it.
I found in kawahara's web site:
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Old 05-02-2003, 10:53 AM   #3612
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Default Futaba

Do any of you guys use the Futaba s9451 servo for steering? Someone on the boards is stating that he is having problems with centering on this servo. I really can't see how this servo would be a problem. The reason I ask, is because, I plan on using this servo on my MTX-3.
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Old 05-02-2003, 10:56 AM   #3613
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Quote:
Originally posted by DSR
Do any of you guys use the Futaba s9451 servo for steering? Someone on the boards is stating that he is having problems with centering on this servo. I really can't see how this servo would be a problem. The reason I ask, is because, I plan on using this servo on my MTX-3.
me me, no problem at all, you should set the servo saver tighter
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Old 05-02-2003, 11:59 AM   #3614
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I'm kind of surprised to hear people saying that the 21T pinion is enough for "long tracks". At Speedline, a lot of the guys were running 22T and some even 23T pinions because of the necessity of running smaller tires (traction rolling). At Crystal Park, if you're not running 22T, your motor runs out of revs by 1/2 way down the straight. This is also taking into account running very high revving motors and appropriate pipes.
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Old 05-02-2003, 04:52 PM   #3615
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Quote:
Originally posted by Pepe
I found in kawahara's web site:
There's a bunch of guys that have these at our tracks. I've also seen them at sheldons hobbies. I think they have like 4 of them left.
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