4-tec really hitting 70?  
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC On Road Nitro Cars >> 4-tec really hitting 70?
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4-tec really hitting 70? - 8/2/2006 4:29:09 PM   
Cambo



Posts: 1516
Joined: 6/20/2005
From: Phoenix, AZ, USA
Status: offline 		I am just wondering if the 4-tec is truly hitting 70 mph. How much power does the 3.3 engine have if it is a 20. Does even accelerate fast because of the gear size required to hit that speed with only a 2-speed. Does it have a 3-speed?

The only car i have herd of with such speed is the scumcher (spelling?) which as a 3-speed in it.
       Post #: 1

RE: 4-tec really hitting 70? - 8/2/2006 5:18:18 PM   
Philster


 

Posts: 1151
Joined: 2/17/2005
From: Crum Lynne, PA, USA
Status: offline 		The Schumacher Fusion and the 4tec have engine sizes that are almost identical. The 3.3 might out rev it and produce more legit horsepower at a higher RPM.

Further, it doesn't mattter how many gears you have, the final drive ratio, the redline of the engine and the horsepower and torque curves will ultimately determine top speed.

It is possible the 3-speed actually allows the Fusion to overcome it's engine's less flexible powerband and lower redline. Additionally, traction is now the only thing that prevents cars from acelerating even faster. Both are probably restricted by the size of the tires on 1/10 touring cars. Engines now can overpower the tires...meaning that extra power won't make an already over-powered 1/10 tourer get up to speed any faster.

The tires are ensuring that these cars probably perfrom very very similar in terms of accel.

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RE: 4-tec really hitting 70? - 8/2/2006 9:37:04 PM   
rushrtr3



Posts: 255
Joined: 3/23/2004
From: Manchester, NH, USA
Status: offline 		I have a hard time believing that the 4-tec 3.3 can reach speeds of 70mph. After seeing what the engine could do in a t-maxx (not much better than the 2.5) I don't think that Traxxas' claims of 70+mph is feasable.

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RE: 4-tec really hitting 70? - 9/17/2006 10:41:56 AM   
ripstriker


 

Posts: 1
Joined: 9/17/2006
From: , CA, USA
Status: offline 		I have the 4tec 2.5 and its hitting just about 70 or just a lil less but here is a video i made with mine. Its all stock nothing added to it.
http://www.ripclan.com/Downloads/4tec2.zip

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RE: 4-tec really hitting 70? - 9/18/2006 1:23:42 AM   
IAMKAOS


 

Posts: 422
Joined: 8/21/2005
From: USA, FL, USA
Status: offline 		i read somewhere that someone put foam 1/8 scale tires on the 3.3 4 tec. he claimed it improved the speed and handling extremely well. .........i wonder how it looked?.

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RE: 4-tec really hitting 70? - 9/18/2006 1:34:55 AM   
IAMKAOS


 

Posts: 422
Joined: 8/21/2005
From: USA, FL, USA
Status: offline 		i tried to download your video file but was unsuccesful.not to be a smart---,... but i would have loved to see this stock 2.5 4- tec do 70 mph. i know two people that have 2.5 4-tec's and using a radar gun they would only hit around 50 to 55 mph.......if they were lucky!
quote:

ORIGINAL: ripstriker

I have the 4tec 2.5 and its hitting just about 70 or just a lil less but here is a video i made with mine. Its all stock nothing added to it.
http://www.ripclan.com/Downloads/4tec2.zip


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RE: 4-tec really hitting 70? - 9/18/2006 1:58:13 AM   
rushrtr3



Posts: 255
Joined: 3/23/2004
From: Manchester, NH, USA
Status: offline 		I was able to download the video and yea that definatley wasn't 70mph. Looked more like 55 to me and it took a good 10 seconds to get to top speed. Do you have any actual radar tested speeds/ time calculated speeds to prove that your actualy going 70 or think it looks like it's going 70. I have an rs4 with a ratio slightly higher than stock and an os 18 cv-rx and mine tops out at 62. The major difference between mine and yours is it takes me 2.2 seconds to get to that top speed.

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RE: 4-tec really hitting 70? - 9/18/2006 3:14:51 AM   
IAMKAOS


 

Posts: 422
Joined: 8/21/2005
From: USA, FL, USA
Status: offline 		THAT IS RIPSTRIKER WITH THE 70 MPH 4 TEC. I DID FINALLY DOWNLOAD THE FILE AND I DO NOT THINK IT IS GOING NEAR THAT FAST. THE ONLY RC CAR I'VE SEEN GO 70 PLUS MPH IS A 1/8 SCALE CAR WITH A $470.00 DOLLAR RACING ENGINE IN IT. BUT....I HAVE HEARD THAT THE 3.3 4-TEC DOES HIT 70 MPH.
quote:

ORIGINAL: rushrtr3

I was able to download the video and yea that definatley wasn't 70mph. Looked more like 55 to me and it took a good 10 seconds to get to top speed. Do you have any actual radar tested speeds/ time calculated speeds to prove that your actualy going 70 or think it looks like it's going 70. I have an rs4 with a ratio slightly higher than stock and an os 18 cv-rx and mine tops out at 62. The major difference between mine and yours is it takes me 2.2 seconds to get to that top speed.



< Message edited by RUSSELL THE 1ST -- 9/18/2006 3:20:51 AM >

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RE: 4-tec really hitting 70? - 9/18/2006 3:23:14 AM   
Enthused


 

Posts: 9
Joined: 4/8/2006
From: , MO, USA
Status: offline 		CT5

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RE: 4-tec really hitting 70? - 9/18/2006 4:05:00 AM   
rushrtr3



Posts: 255
Joined: 3/23/2004
From: Manchester, NH, USA
Status: offline 		I was talking to ripstriker. I apologize if there was any confusion in my post.

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RE: 4-tec really hitting 70? - 9/18/2006 4:37:20 AM   
chilout3070


 

Posts: 7
Joined: 9/13/2006
From: palmyra, NJ, USA
Status: offline 		I have a Nitro 4-tec and have been clocked at 68mhp . By a police radar gun in my high school parking lot. it is possible. the 2.5 motor does not really got on top off them. you really need about 500 ft of straight away. to get there . i ran out of space . My 4-tech is bone stock. you should not hate on a car. That does need to get hooked up out of the box. So you can keep up with other peoples cars.

It is possible to get to that speed . I also depends on the weather . I have found that the 4-tech runs faster when it warmer outside . unlike the Hpi cars . The 4-tech gears are super tall. be for you gear start hating check it out . Also the Rpm of all Traxxas motors is about 7000rpms higher than most motors out there.

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RE: 4-tec really hitting 70? - 9/18/2006 4:46:40 AM   
rushrtr3



Posts: 255
Joined: 3/23/2004
From: Manchester, NH, USA
Status: offline
quote:

ORIGINAL: chilout3070

. you really need about 500 ft of straight away. to get there . i ran out of space .


Thats exactly my point. If you need more than a football field to get to there predicted top speed than it's as if you never reached it in the first place. Also how is that you got 68mph out of your 4-tech with stock gearing when your engine would have to be pulling more than 45,000 rpms.

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RE: 4-tec really hitting 70? - 9/18/2006 5:20:44 AM   
chilout3070


 

Posts: 7
Joined: 9/13/2006
From: palmyra, NJ, USA
Status: offline 		like I said it was a warm day. so i was running my motor lean . i don't know how long the lot i play in is but it is not that long. it is sad that you cant understand how that is possible . it seems you have not been doing RCing for long . If you have been, you would know that your motor will act different depending on the weather. basiclly the warmer the weather the faster you run.

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RE: 4-tec really hitting 70? - 9/18/2006 2:52:09 PM   
rushrtr3



Posts: 255
Joined: 3/23/2004
From: Manchester, NH, USA
Status: offline 		I've been in to RC for 7 years now and have never heard of a trx 2.5 reving over 40k, no matter what the weather conditions are. Are you truely using the stock gearing that came with the car, in other words did yo buy it used and it came with a taller gear ratio but you thought it was the stock one. Then possibly you might be able to reach that speed but I still find it highly unlikely.

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