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 Post subject: changing lenght on the exhaust for nt18t on nt 18
PostPosted: Wed May 24, 2006 22:58:30 
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Joined: Thu Dec 22, 2005 22:09:47
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Location: Denmark, copenhagen
have installed the 2 pice exhaust on my nt18.

i have been playing around with the lenght of the pibe by moving
it forward and back in the rubber connection with huge results.

watch out not making it to long!! then all bottom power is lost!

this exhaust is a must have for serious racers.

what are your expirences with the new exhaust?


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PostPosted: Thu May 25, 2006 00:07:56 
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Joined: Thu May 18, 2006 08:09:42
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Location: Las Vegas, NV
Yep for experience racers!! Serpent owner know, there is a measurement from the bend of the header to the seam oh the muffler/resonator. Too long loose low end, to short the opposite. You must find where to put it.


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 Post subject: Re: changing lenght on the exhaust for nt18t on nt 18
PostPosted: Thu May 25, 2006 10:21:45 
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Joined: Wed Mar 08, 2006 23:21:46
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Location: Switzerland
kant76 wrote:
have installed the 2 pice exhaust on my nt18.

i have been playing around with the lenght of the pibe by moving
it forward and back in the rubber connection with huge results.

watch out not making it to long!! then all bottom power is lost!

this exhaust is a must have for serious racers.

what are your expirences with the new exhaust?


Yep, that is my experience too. I´ve now got about just under 1mm space between header and pipe.
The loose of bottom end power with a to long pipe is really impressive. :shock:


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PostPosted: Thu May 25, 2006 11:44:40 
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Joined: Thu Dec 22, 2005 22:09:47
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Location: Denmark, copenhagen
my nt18t was compleatly non responsive until 75% opening of the cab when I was running the engine in, I hope that this was due to a way too long exhaust, I first saw it when I was on the track yester day, didn´t have time to try it yesterday at the track, was to buissy to run in the onroad nt. and a minor lake had formed on the ofroad track because of lots of rain :-(.

It´s har to decide witch of the cars to drive when you get 2 new cars with 3 days apart :-) but thats a luxery problem.

check out our new playground in denmark www.grcc.dk


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PostPosted: Thu May 25, 2006 18:08:32 
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Joined: Wed Mar 08, 2006 23:21:46
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Location: Switzerland
kant76 wrote:
my nt18t was compleatly non responsive until 75% opening of the cab when I was running the engine in, I hope that this was due to a way too long exhaust, I first saw it when I was on the track yester day, didn´t have time to try it yesterday at the track, was to buissy to run in the onroad nt. and a minor lake had formed on the ofroad track because of lots of rain :-(.

It´s har to decide witch of the cars to drive when you get 2 new cars with 3 days apart :-) but thats a luxery problem.

check out our new playground in denmark www.grcc.dk


Ups, 75% opening till response is really a lot! :shock: I don't think this is just because of the length of your pipe.
I never had any problems with response during my testing with the length of the exhaust pipe. Even when I pull the pipe max. out of the rubber connection.
Did you figured something out yet?


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PostPosted: Thu May 25, 2006 22:43:05 
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Joined: Thu May 18, 2006 08:09:42
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Location: Las Vegas, NV
75% before it's responsive!!! thats bad!!! It's ok. just adjust the carb again. u change backpressure, when changin length of pipe. Turn main screw 1/4 turn counterclockwise. if it is worst turn clockwise 1/2 turn. if it improves, 1/8 turn til it's correct. u r probably too rich.

Recieve the photos Kenn??


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 Post subject:
PostPosted: Fri May 26, 2006 00:00:41 
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Joined: Thu Dec 22, 2005 22:09:47
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Location: Denmark, copenhagen
yes the car was running way to rich, but shortining the exhaust also made a huge difference.

I´ll return tomorrow with a longer awnser on the fixes i mad are way to tired to type right now


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