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Old 01-07-2002, 02:36 PM   #121
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No doubt, I'm still learning. So far it seems most of the improvment I've seen is in much higher rpm. Maybe I shouldnt have said "all" you get from a dremel is RPM (misspeak?). I assumed I wouldnt see NOVA type torque, so went to a 13
tooth 1st gear. That seemed to let me run the twisties with the big boys, sometimes passing them.
Just got the new Rc nitro mag in the store, the GT-4R is reviewed, wth a RTU MT12.
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Old 01-07-2002, 04:23 PM   #122
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Old 01-07-2002, 06:05 PM   #123
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MM, LOL, no biggie. And I'm definitely not you, If I came across "too" hot I'm sorry. Didnt mean to poke ya in the eye, LOL. I've "modded" 3 Ofna colt 12s. Sum total of my experience. Was made manager at the Local General hobby shop about 20 months ago, and had to learn a bunch, quickly (trains, plastic models, nitro cars). So I've been into nitro for just under 2 years. A 44 year old "newbie". 2002 will be my 1st year to really spend some time at the local tracks.
The Rc Nitro is March 2002, they cover the "stock" Mt12 too, in a separate article.
Do you mean your MT12 will rip up Ofna spurs? He he, cool. My Racer 2 was my 1st car (a drag car), has Ofnas big 15, 8 port in it. Over a horse no doubt, its never torn up a spur (Ofna). Ahh man, I just dont have the bucks yet.
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Old 01-07-2002, 06:34 PM   #124
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Old 01-07-2002, 06:59 PM   #125
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Quote:
Originally posted by Motorman
(multiple failures)
MM, Oh jeese! They came out with the clutch type 2spd too late for him.
The Gt-4s & Reflexs make my OB4 look old, snif. I've been running 5 apart with a slightly later shift, Ob4: 13-18, 45-41. On big Parking lot tracks. 200 ft plus straight aways. Seems like most guys are running 4 apart, eh? DO you do up big 15s for onroads too right? Opps, there goes all my Hobby $$ for 2002.
Thanks for the info.

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Old 01-07-2002, 07:24 PM   #126
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Old 01-08-2002, 03:14 PM   #127
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Motorman, you were saying on the HPI forum that most cars are overgeared for the RS12. What gearing would you recommend for a Mugen MTX2 using a RS12?
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Old 01-08-2002, 07:06 PM   #128
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Old 01-08-2002, 08:12 PM   #129
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Ummmmm, wow. I dont quite get all of the info you gave me, but I will sit down and think it through after work. Wow.

I have a MTX and a V1R so I a trying to work this through but it appears that you are saying to go less teeth on the pinion to compensate for a lack of low down torque, and to keep the top speed down to a manageable level? Because the RS12 pulls so much more RPM it can be as fast at lower pinion count, and actually needs to to make up for lack of low end torque?

And the clutch engagement point needs to be very high as it does not pull well enough on low RPM?

OK thanks for all the info, need to think it thru
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Old 01-08-2002, 08:29 PM   #130
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Old 01-08-2002, 08:55 PM   #131
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As usual you have elevated me to a new level of understanding I have to this point be an install engine/install standard clutch and pinions and tune chassis guy. What you just outlined makes perfect sense yet I never even considered it before

I like your idea about bringing the pinion difference closer due to trying to reduce the RPM drop in the 1-2 change because of the narrow RS12 powerband. Funny thing is I spent a fortune on my 1:1 car gearbox for a close ratio cog set but it never occured to me in my RC *slaps head*

Thanks
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Old 01-08-2002, 09:45 PM   #132
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Old 01-08-2002, 10:14 PM   #133
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Wow that thing is almost as light as my 1/10th. I have to reduce the weight in my drivetrain yet as well! I am too busy racing to mess with the car too much

I am kinda nervous of my RS12 now, hope it goes OK. I might have to get one of your 16% IFMAR specials if it does not work out so well
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Old 01-08-2002, 10:57 PM   #134
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Motorman,

I installed an RB X12T on my Impulse, I have about 10 tanks on it, on my way to leaning it out I get a midrange choke... I know I dont have it tooo lean because after it chokes it revs up with alot of smoke.....the temp is about 160 F...Hope you can shed some light

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Old 01-08-2002, 11:08 PM   #135
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Quote:
Originally posted by got_speed?
Motorman,

I installed an RB X12T on my Impulse, I have about 10 tanks on it, on my way to leaning it out I get a midrange choke... I know I dont have it tooo lean because after it chokes it revs up with alot of smoke.....the temp is about 160 C...Hope you can shed some light
My first thought is may be the engine is too rich and when the low to high transistion it just flooded the carb! may be try to lean it out a bit more and maintain around 190 see what happen!
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