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Baggedgp
12-11-2007, 11:48 AM
How much Hp does the TRX 3.3 Have. Im looking for a motor for my revo. Its a 2.5 chassis FOC, I was looking at a few os18tm on ebay, and a os21tm at my lhs. But I have found a great deal on a TRX 3.3 but was wondering how they compare power wise to the os 21 and 18.

I would like to be faster than by friends t-maxx (.15) with a os18 cv-r with reverse. He runs 20% I've always ran 33%

aussiek2000
12-11-2007, 12:23 PM
abmods dynoed a 3.3 at 0.98HP

Baggedgp
12-11-2007, 01:48 PM
abmods dynoed a 3.3 at 0.98HP


Wow thats lower than i expected. Maybe ill stick with a OS motor.

aussiek2000
12-11-2007, 02:02 PM
all motor are lower than expected a modded picco .28 dynoed at 2.09HP.

Baggedgp
12-11-2007, 02:16 PM
So why do they rate them so high

robert_s
12-11-2007, 02:16 PM
Wow thats lower than i expected. Maybe ill stick with a OS motor.


I don't see that posted on their site.

JMS2007
12-11-2007, 02:24 PM
No way can a 3.3 be putting out less than 1hp??? Is this a reading from the wheels or the crank? what an earth were the pro 15 blocks putting out in that case then? must have been 0.25 hp as traxxas claims 50 more power over the 2.5 & thats alot more power than the pro 15.. really cant see it being that low

junkyard
12-11-2007, 02:24 PM
Traxxas does not and will not post HP figures. There are so many variables and ways to dyno the engine you could readings anywhere from .5 to 5 HP. The ones that try to sell their engines by HP are only kidding themselves. You notice Detroit quit selling cars by HP ratings. It was proven that a car with their 350 HP rating was only putting 185 HP to the wheels, which is the only reading that counts.

NitroRustler41
12-11-2007, 03:43 PM
so was that .98 figure through the wheels, if it is, that is pretty decent if you thiunk about it. remeber, it is still a smallblock.

Over_revO
12-11-2007, 06:46 PM
all motor are lower than expected a modded picco .28 dynoed at 2.09HP.


ill stop you ....

read carefuly, the TRX did 1.06 and was not dynoed by ABmods but on the same dyno.


A stock Picco .28 id 2.00hp
the OS .28 did 2.09

and a ABmods Picco .28 did 2.40hp

:)

Over_revO
12-11-2007, 06:47 PM
Its at flywheel....

A Force .32 engine do 1.23hp .....
The torque and powerband are also huge factor that define the engine power..

NitroRustler41
12-11-2007, 06:56 PM
yeah, but man that still seems a little low. so the 2.5 has 60% less power than the 3.3?

that means it has less than half a horse. kinda hard to believe. when my rusty hits powerband, it's like a rocket i mean seriously. 0- top end comes in 4 seconds. stock gearing + larger tires = 50 + mph.

Over_revO
12-11-2007, 07:11 PM
Yeah, but dont forget it doesnt weight a lot....

1hp is pretty strong just to move 6 pounds on wheels.
The Xdyno is adjusted to give the right real hp.

Over_revO
12-11-2007, 07:13 PM
Heres a Dyno sheet from abmods showing the Picco .28

http://i3.photobucket.com/albums/y55/MistyLou7/Picco2823hp.jpg

Unsullied_Spy
12-11-2007, 10:00 PM
A 3.3 combined with a Resonator may only put out 1 HP, but it'll be putting that 1 HP out for a while (great powerband). The 3.3 in my Revo has TKO bearings and a Single Chamber Resonator on it, so it takes off like mad and just keeps going, typically maxing out in about 3 seconds. Granted it isn't too fast, never GPS'ed it but I'd say mid 30s to low 40s, but it's got some beef for such a tiny engine.

RobWilJas
12-12-2007, 02:15 AM
There's too many variables and conflicting results. Radio Control Car Action (http://findarticles.com/p/articles/mi_qa3825/is_200309/ai_n9295814) dyno'd the 2.5 at 1.33hp. Now if that were true and Traxxas' claim of 60% more peak HP is true, then the 3.3 should produce 2.12hp, and the Pro .15 should produce .83hp.

biggregg24
12-12-2007, 06:03 AM
hp means nothing in these little engines, its all about torque and the rpm band like over revo said, i mean come on, the cen 7.7 is rated at 5 hp, you think you can put that on a go-cart and it would move= na da

Kur
12-12-2007, 03:59 PM
hp means nothing in these little engines, its all about torque and the rpm band like over revo said, i mean come on, the cen 7.7 is rated at 5 hp, you think you can put that on a go-cart and it would move= na da

Torque and horse power are relative to each other. You can't know one without knowing the other. Torque=5252xhp/rpm. Hp=RPMxT/5252

So when you say that these little engines are all about torque and RPM, you are basically saying horse power.

Horse power is work done over distance and time, torque is force. You can have torque without motion, but not horsepower without motion. For example, if you sit on a steel rod hanging out of a wall, you are applying torque to that rod even if it doesn't move at all. If you weigh 150 pounds and sit 2 feet from the wall, you are applying 300 lbs/ft of torque but no horsepower.

Now if that rod moves 1/8 of a turn and takes 1 second to do so, you were applying 300 lbs/ft of torque, and about .43 hp. If the rod moves 1/8 of a turn in half a second, you would be applying about .86 hp. If you change the torque (if you sat closer to the wall for instance) to 150 lbs/ft the horse power becomes .43 hp again.

So as you can see, hp and torque are both important because they are directly related to each other.

Over_revO
12-12-2007, 05:12 PM
Yep,

And i said the horsepower is not everything.... not useless :)

NitroRustler41
12-12-2007, 07:56 PM
whatever... i think the final consencuss is.....the 3.3 is a pretty darn good little small block, likes to rev like mad, and puts out enough power to move our little trucks at absurd rates that boggles the mind of non-RC people.

/thread

Mark_s
12-12-2007, 09:52 PM
Back to the original question, a 3.3 revo should smoke an .18 cv-r Maxx, especially with you having the FOC, the 18TM has barely less (Or more, it's debatable) tourqe than the 3.3, but a bit less horsepower.

Over_revO
12-14-2007, 03:58 PM
A cvr is way less powerful than a 3.3

Its a side exhaust engine too.

cuda_tmaxx
12-14-2007, 08:21 PM
A cvr is way less powerful than a 3.3

Its a side exhaust engine too.
Agreed. My 18 cvr was slightly better than the 2.5 IMO, but failed in comparison to my 3.3. The side exhaust is a big ball and chain.

robbie21mma
12-19-2007, 12:25 PM
Its at flywheel....

A Force .32 engine do 1.23hp .....
The torque and powerband are also huge factor that define the engine power..

how can ofna claim that the force .32 makes 3+ hp and o.s. .30 claims 3hp and o.s. .18tz claims to be the first small block to break the 2hp barrier? are all the companies just doing false advertisement????????????
take a stock 02 camaro ss its got 325hp weighing 3400lbs thats 1 hp for every 10.46lbs for a street car thats actually really good but when you take a revo 3.3 that weighs 10lbs and lets say the 3.3 which is a .20 puts out 2hp like o.s. .18tz that would be a power to weight ratio of 1hp for every 5 lbs which is twice the power to weight ratio as the 02 ss and its more believeable considering the revo can easily do power wheelies and there is no way the stock 02 ss camaro could but if the 02 camaro ss had twice the power to weight ratio which would be the same as what i mentioned earlier in the revo it would be 650hp pulling 3400lbs which would be that 1hp for every 5lbs "same power to weight as the revo" then it would bring the front wheels up on take off at a track......... but according to your math if the 3.3 puts out only .98hp and it weighs 10lbs the thats pretty much a power to weight ratio of 1hp for every 10lbs just like a stock ss camaro ss in which would never take off like the revo in real life nor would never power wheelie like the revo in real life not with a 1:10 p to w ratio but with a 1:5 p to w ratio then yes......... i would just look at what these cars are doing such a spinning all 4wheels, power wheelies, accelerating the way they do snapping their weight around so so easily and the doughnuts they easily do then think if a real car could do that???????? no way, the real life size car which would be around 3400lbs would have to have like 650 to 750 hp to do that and none of them do !!!!! thats why you dont see corvettes camaros or mustangs doing power wheelies and if it was 4 wheel drive they wouldnt be able to do a doughnut nor snap their weight around so easily unless they had a 1:5 p to w ratio............. so by this simple theory i would believe all the companies are giving correct hp numbers cuz there is no way the engines are making .25hp .50hp .75hp and at most a modded big block making 2hp i mean come on now there is no way these things have soooo little power, to power wheelie their 10lb truck and spin all 4's and snap their 10lbs so easily do the math and think about it

Zinno
12-26-2007, 02:50 PM
I wouldn't say there is any false advertising. They're probably advertising the number that their dyno shows. There is no industry dyno standard, so one company's engine may show 5 hp on their dyno, but only 2 on another dyno, or 1.6 on yet aother dyno. We use our dyno for in house use only, we do not buy into the "HP wars" or advertise our results.

This is why it would be foolish to "shop" an engine judging only by advertised horsepower. Even if there were an industry standard for horsepower ratings, an expensive, highrevving 3 hp short stroke engine will perform quite poorly in a Revo when compared to an inexpensive, long stroke, 1 hp engine in the same Revo.

The best way to find out if an engine will work for you is to ask someone who actually has or has used the engines you're looking at, drive vehicles equipped with the engines you're interestin in, or test them yourself.

Nitro Chicken
12-26-2007, 06:58 PM
The best advertisement is concrete results. The 3.3 powered Revo dominated the 2007 R/C Pro International Finals (http://www.traxxas.com/support/index.php?action=artikel&cat=143&id=584)

NitroRustler41
12-26-2007, 10:27 PM
how can ofna claim that the force .32 makes 3+ hp and o.s. .30 claims 3hp and o.s. .18tz claims to be the first small block to break the 2hp barrier? are all the companies just doing false advertisement????????????
take a stock 02 camaro ss its got 325hp weighing 3400lbs thats 1 hp for every 10.46lbs for a street car thats actually really good but when you take a revo 3.3 that weighs 10lbs and lets say the 3.3 which is a .20 puts out 2hp like o.s. .18tz that would be a power to weight ratio of 1hp for every 5 lbs which is twice the power to weight ratio as the 02 ss and its more believeable considering the revo can easily do power wheelies and there is no way the stock 02 ss camaro could but if the 02 camaro ss had twice the power to weight ratio which would be the same as what i mentioned earlier in the revo it would be 650hp pulling 3400lbs which would be that 1hp for every 5lbs "same power to weight as the revo" then it would bring the front wheels up on take off at a track......... but according to your math if the 3.3 puts out only .98hp and it weighs 10lbs the thats pretty much a power to weight ratio of 1hp for every 10lbs just like a stock ss camaro ss in which would never take off like the revo in real life nor would never power wheelie like the revo in real life not with a 1:10 p to w ratio but with a 1:5 p to w ratio then yes......... i would just look at what these cars are doing such a spinning all 4wheels, power wheelies, accelerating the way they do snapping their weight around so so easily and the doughnuts they easily do then think if a real car could do that???????? no way, the real life size car which would be around 3400lbs would have to have like 650 to 750 hp to do that and none of them do !!!!! thats why you dont see corvettes camaros or mustangs doing power wheelies and if it was 4 wheel drive they wouldnt be able to do a doughnut nor snap their weight around so easily unless they had a 1:5 p to w ratio............. so by this simple theory i would believe all the companies are giving correct hp numbers cuz there is no way the engines are making .25hp .50hp .75hp and at most a modded big block making 2hp i mean come on now there is no way these things have soooo little power, to power wheelie their 10lb truck and spin all 4's and snap their 10lbs so easily do the math and think about it

this is pretty good info. nice post. but also, the camaro was underrated fro mthe factory. a stock 02 camaro ss is puttin out about 290-300 whp, wich is equal to 345-350 hp at the fly.

trust me, 650 hp is more than enough to bring up the front tires on as full weight camaro. i have seen guys do this with long tubes, 275 slicks, stock catback, a 3600 stall, and new intake system, and a baby street cam. he brings em up about 3 inches or more on the launch. and thats with a 3.42 rear end. that is awesome for such little work.


final verdict. the 3.3 is pumping out way more than 1 hp, and so is the 2.5 for that matter.