O.S .12tz any good???

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Old 08-03-2008, 12:21 AM
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Arrow O.S .12tz any good???

I just bought thE O.S .12tz and i was wondering if anybody has one and how good are they? Even if you have had nightmares with them i still would like to know. Also how many ports are they i think i counted 5 + 1 exhaust ports.?

Thanks guys
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Old 08-03-2008, 12:28 AM
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there're both 3 and 5 ports tz12, what's the color of yr heatsink?
silver heatsink will be 5 ports; blue will be 3.

OS engines are one of the most easy to tune. tz12 has good punch low-mid; highend will be abit lacking. if yr track is small to medium; tz12 shld be have enough power....try to gear slightly higher to take advantage of the lowend punch and gain better topspeed.
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Old 08-03-2008, 01:21 AM
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Yeah it's the one with the silver heatsink. What gearing do you recomend for a small to medium type track, the fast guy's are doin 15 - 16 second laps? It's going in a G4s if that means anything?
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Old 08-03-2008, 02:32 AM
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Arrow You do the maths

At the moment i'm running 46t and 51t spur gears and the clutch bell is 16t and 21t. When i got it the spur gears were 46t and 52t but the clutch bell was still the 16t and 21t which means the split was out by one so i changed the 52t spur to the 51t so now the split is the same, is this correct? I haven't driven it yet on this combination but i am a little worried as my other G4 runs a 47t and 51t combination which means it has a split of four but my new car has a split of five, is this going to affect the performance in any way??? Hope you could follow my ramble as it can be quite confusing Does anybody know where i can get information on how to gear your car properly?
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Old 08-03-2008, 05:59 AM
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try with 16/52 and 21/47.

if this gearing cant reach top by end of the straight, then u might wanna try 15/50 and 20/45 or 16/51 and 21/46 if yr engine max-out too early on the straight.

about gears split, better to maintain same split for proper gear meshing...but still alrite to have 1 tooth different. no worries.
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Old 08-03-2008, 11:56 PM
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What do you think it's going to be like with 16/21...46/51 ????
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Old 08-04-2008, 12:06 AM
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Originally Posted by freestyles View Post
What do you think it's going to be like with 16/21...46/51 ????
that'll be a difficult qn to answer.

you'll need to try it out on the track to see and hear for yourself to be sure.

just try to gear it so that it'll just max out or almost max out at the end of the straight.
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Old 08-04-2008, 12:13 AM
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the TZ is a great little engine I just picked up one since I race on a small track, it suits very well, extremely easy to tune and surprisingly fast. Im running a sirio 2611 pipe with it which seems to be working well.
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Old 08-04-2008, 12:41 AM
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I have had many TZs over the past few years; but after comparing them with my Novarossi SCT, I never looked back. I know, im comparing a Toyota with a Lamborgini in terms of prices, but just sharing my experience. In short tracks, the TZs hold up on their own and for the price, you cant complain... I'd suggest if you need to stay on that price budget of the TZ, next time get a JLR Red Dot... Those engines are crazy fast out of the box. But for starters, stick to the TZ until you see it die... Have fun...
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Old 08-04-2008, 09:11 PM
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I actually got the motor in a car i just bought. I picked up a G4s with carbon fibre everything, allum. pulleys, RX pack, 2 x hitec mg servos (hs-5645mg), a body and the motor for $400. This car has probably only seen 2-3 races and it's immaculate so i can't complain, i'm actually very happy with it. I'm still in the process of re-building it so i can't wait to get i out there.
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Old 08-07-2008, 01:34 AM
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Do you still have to use a shim under the glow plug if it's a turbo plug??
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Old 08-07-2008, 01:40 AM
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na u dont
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Old 08-11-2008, 02:46 PM
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When you guy's say change your gear ratio's do you remove your pinions off the clutch bell and then put different ones on or do you guy's have a few different ratio's made up on different clutch bells and then you just swap them around??????
Originally Posted by keavze View Post
try with 16/52 and 21/47.

if this gearing cant reach top by end of the straight, then u might wanna try 15/50 and 20/45 or 16/51 and 21/46 if yr engine max-out too early on the straight.

about gears split, better to maintain same split for proper gear meshing...but still alrite to have 1 tooth different. no worries.
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Old 08-11-2008, 02:57 PM
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Originally Posted by freestyles View Post
When you guy's say change your gear ratio's do you remove your pinions off the clutch bell and then put different ones on or do you guy's have a few different ratio's made up on different clutch bells and then you just swap them around??????
Either way works but it's cheaper to change them (only need one bell that way).
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Old 08-12-2008, 03:59 AM
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Apart from a proper pinion tool what's the best way to take them off and aren't they reverse thread, though i'm not to sure. Thanks.
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