Faired vs Unfaired Performance

switchingtopuns · April 17th, 2015, 10:11 AM

I've got a pregen track bike I am putting together and I'm looking at pulling the fairings for weight reduction. Does anyone have any idea what the reduction in top speed looks like with an unfaired pregen? How do you all run your pregen track bikes?

Brother Michigan · April 17th, 2015, 10:26 AM

I have exactly zero data to back this up, but I think the weight reduction will be far outdone by the increase in drag coefficient.

Singh2jz · April 17th, 2015, 10:30 AM

Idk about the need of the tail, but the rest, I think, would help.

MrAtom · April 17th, 2015, 10:35 AM

It'll be faster with the fairings on. I can only get my naked 250 up to 97ish mph (indicated) and I feel I should be able to squeeze a little more out. I'm 150lbs.

DEFY · April 17th, 2015, 10:58 AM

The fairings create a better air stream, less drag. Other wise all the open gaps without the fairings just add to the increase in drag.

My comparison it's like swiss cheese lol.

fuel664 · April 17th, 2015, 12:57 PM

at 100 mph the fairings help. when i took mine of my bike i could tell the difference. and getting over 100 is next to impossible with out a strong tail wind with out fairings. before i was doing 102-103 ish with no to little wind with fairings . according to my trail tech speedo

csmith12 · April 17th, 2015, 01:09 PM

Quote:

Originally Posted by switchingtopuns

I've got a pregen track bike I am putting together and I'm looking at pulling the fairings for weight reduction. Does anyone have any idea what the reduction in top speed looks like with an unfaired pregen? How do you all run your pregen track bikes?

The effects of wind drag are substantial at higher speeds. The added aero benefits the fairings give outweigh the negatives from their weight. The key to a quick lap time on a 250 is getting your speed up and carrying that speed. With so little power, full faired 250's will pull on you at corner exit while you're fighting wind + weight, while their not fighting the wind as much.

Having seen a number of pregens on the track though, it aint really gunna matter much for 75% of the track asside of the straights. Lemme ask you this... how many turkey pans have you see out on the grid? I am sure the aero of a turkey pan aint comparable to the proper lower.

switchingtopuns · April 17th, 2015, 01:30 PM

Good stuff, fairings stay. Thanks all! Guess I'd better get my hands on a full muzzy.

April 17th, 2015, 10:11 AM	#1
switchingtopuns ninjette.org newbie Name: Dan Location: St. Louis Join Date: Mar 2015 Motorcycle(s): Pregen 250 Track Bike, 650r Track Bike, Z750, KTM XC300 Posts: 7	Faired vs Unfaired Performance I've got a pregen track bike I am putting together and I'm looking at pulling the fairings for weight reduction. Does anyone have any idea what the reduction in top speed looks like with an unfaired pregen? How do you all run your pregen track bikes?

April 17th, 2015, 10:26 AM	#2
Brother Michigan ninjette.org sage Name: Aaron Location: Winder, GA Join Date: Jun 2012 Motorcycle(s): 2013 Ninja 300 Posts: 718	I have exactly zero data to back this up, but I think the weight reduction will be far outdone by the increase in drag coefficient. __________________________________________________ DISCLAIMER: I generally have no idea what I'm talking about.

April 17th, 2015, 10:30 AM	#3
Singh2jz ninjette.org certified postwhore Name: Inderveer Location: San Jose Join Date: Nov 2012 Motorcycle(s): '07 ex250-F/J Posts: A lot.	Idk about the need of the tail, but the rest, I think, would help. __________________________________________________ The Bike \| The Truck

April 17th, 2015, 10:58 AM	#5
DEFY ᗧ•••ᗣ•ᗣᗣ•••ᗣ Name: Nick Location: NY Join Date: Nov 2013 Motorcycle(s): 2009 Ninja 250R and 2014 Triumph 675R Posts: A lot.	The fairings create a better air stream, less drag. Other wise all the open gaps without the fairings just add to the increase in drag. My comparison it's like swiss cheese lol. __________________________________________________ Spoiler for topic: It might just be the [you] tag

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April 17th, 2015, 10:35 AM	#4
MrAtom . Name: . Location: . Join Date: Aug 2014 Motorcycle(s): . Posts: A lot. MOTM - July '15	It'll be faster with the fairings on. I can only get my naked 250 up to 97ish mph (indicated) and I feel I should be able to squeeze a little more out. I'm 150lbs.

April 17th, 2015, 12:57 PM	#6
fuel664 ninjette.org member Name: robert Location: alaska Join Date: Apr 2015 Motorcycle(s): ninja 250, v65 magna Posts: 35	at 100 mph the fairings help. when i took mine of my bike i could tell the difference. and getting over 100 is next to impossible with out a strong tail wind with out fairings. before i was doing 102-103 ish with no to little wind with fairings . according to my trail tech speedo

April 17th, 2015, 01:30 PM	#8
switchingtopuns ninjette.org newbie Name: Dan Location: St. Louis Join Date: Mar 2015 Motorcycle(s): Pregen 250 Track Bike, 650r Track Bike, Z750, KTM XC300 Posts: 7	Good stuff, fairings stay. Thanks all! Guess I'd better get my hands on a full muzzy.