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Os .21tm in trx revo

Old 08-07-2022, 07:08 PM
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Marko36608
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Default Os .21tm in trx revo

I just reached full break-in on my OS .21TM in TRX REVO.
My problem is I've tuned HSN and LSN for max performance and cannot get Max RPM and Wheelies like I've seen on many YouTube Videos.
I am at the point of not knowing what to do.
Any help would be greatly appreciated!!!
The pipe is stock pipe from Traxxas Revo...
The Manifold came with engine...

Last edited by Marko36608; 08-08-2022 at 12:45 PM.
Old 08-08-2022, 04:06 AM
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1QwkSport2.5r
 
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What pipe and manifold are you using? What fuel and glow plug? What gearing is it set up with?

Just for what itís worth, the OS .21TM doesnít have that much more power than a 3.3 Traxxas engine does. It should wheelie, however. It might just need a gear change.
Old 08-08-2022, 12:50 PM
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Marko36608
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Originally Posted by 1QwkSport2.5r View Post
What pipe and manifold are you using? What fuel and glow plug? What gearing is it set up with?

Just for what itís worth, the OS .21TM doesnít have that much more power than a 3.3 Traxxas engine does. It should wheelie, however. It might just need a gear change.
The Gearing is Stock, LC3 Plug, Pipe is Stock TRX, Plug LC3, Manifold came with engine.
Fuel Bones Brew 20% 12%Oil...

Last edited by Marko36608; 08-08-2022 at 12:59 PM.
Old 08-08-2022, 01:04 PM
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Marko36608
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I hope I answered your questions.
Old 08-08-2022, 04:04 PM
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1QwkSport2.5r
 
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Get rid of the LC3 plug - it’s a hot plug. You want a medium heat plug. O’Donnell’s purple medium long reach or a McCoy MC8 are good medium plugs. A Novarossi C6S or C6G is a great plug too.

Next, I’d drop the Traxxas pipe and get a better pipe. If you have the high rpm dual chamber resonator, you’re good for the most part. Just drill the stinger out. If it’s the single chamber, get the two-chamber at the very least.

Lastly, change your spur gear or clutchbell - the spur gear is the cheaper option. Try a smaller clutchbell or bigger spur gear.

If your truck is setup the same as the others you’ve seen and yours isn’t doing what theirs does, then your tuning isn’t right.
Old 08-08-2022, 08:48 PM
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Marko36608
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Thank you for help!! I will do your recommendations. The pipe is a dual chamber pipe. The videos I've seen show Revo wheeling with the same pipe.
Again Thank You for your help!!
Old 08-08-2022, 10:34 PM
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The glow plug change won’t make a dramatic difference, but will allow you to eek a little more power out of it. Same with drilling the stinger out.

I think either it’s geared too high (for speed) or you don’t have it tuned quite right, or both.

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