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Old 15th May 2005, 00:16   #1
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Default Need for speed.

Guys can someone tell me how i can increase the top wack of my P180(2005 model).it is 5 months old and has done 1600 kms.i dont want to reduce the FE or rthe acceleration too much.i dont want to increase the topspeed much ,but by say about 5-10 kmph more than 120kmph(speedo) that i have done so far.do u guys think the topspeed will increase after some more running in.say after 2000kms.

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Old 15th May 2005, 00:57   #2
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"do u guys think the topspeed will increase after some more running in.say after 2000kms."

as far as i know the 180 dtsi v2 has a lower top whack than the 180 classic and the 180 dtsi v1...
as per autocars road tests the 180 dtsi v2 has a top speed of 117kmph..that will be ~120 on the speedo..

http://www.autocarindia.com/new/Road...ls.asp?ID=1018

Last edited by tachometer : 15th May 2005 at 01:07.
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Old 15th May 2005, 01:23   #3
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If your bike is aerodynamically limited (which i think it is), then there's very little you can do to gain 5-10kmph over your present top speed.

There are three basic ways of improving top speed and acceleration :
1. Lighter kerb weight
2. Better aerodynamics
3. More power

But, if the bike is limited by engine rpm, you can get the gear ratios changed.

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Old 15th May 2005, 02:43   #4
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Quote:
Originally Posted by tachometer
"do u guys think the topspeed will increase after some more running in.say after 2000kms."

as far as i know the 180 dtsi v2 has a lower top whack than the 180 classic and the 180 dtsi v1...
as per autocars road tests the 180 dtsi v2 has a top speed of 117kmph..that will be ~120 on the speedo..

http://www.autocarindia.com/new/Road...ls.asp?ID=1018
i know that topspeed of P180(2005) is lower than 2004 model.But it is due reduction in the gearing(lower gearing) for better acceleration.

------------------------------Speed theorem----------------------------
acc to ACI info
at 100kmph on speedo P180(2005) has 94 kmph as truespeed.
so error is 100-94=6kmph.
assume at 117kmph speedo error has remained at 6kmph

so if 117kmph is true topspeed then speedo read must be

100/94*117=124.4~125kmph.

the manual also states 125kmph as topspeed.

now the P180N has 5th gear ratio of 12.4kmph@1000pm
so at say 9400rpm speed will be

12.4*(9400/1000)=116.56kmph~117kmph

ACI has also got true topspeed of 117@9400rpm.

so the lower topspeed of p180N is due to lower gearing(lower 5th gear ratio).The p180 can rev upto 10400rpm.so to get better speed i need to do something to improve the 5th gear ratio to say 13.5kmph@1000rpm to get increase of 10kmph in topspeed. any idea how to do this without changing the gearbox.something about rear chain sprocket or fit bigger jets(i know this will reduce effeciency).

Help???

Last edited by merve_extreme : 15th May 2005 at 02:56.
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Old 15th May 2005, 04:36   #5
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the best u can do is put a k&n,theres a filter specially for the pulsar....this increases performance as well as efficiency.....but just the filter wont do....u'll have to increase the jet size too........other than that u'll have to compromise on fuel efficiency...or better just get a comet....
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Old 15th May 2005, 17:36   #6
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hmmm..
as baleno power stated the best u can do is fit k&n filters n perforemance exhausts..
also u can change the jettings n increase ur carb bore..or even the cylinder bore..
but this will bring down your FE

some ppl do port their 4 st bikes.. but am not sure porting brings about major performance boost in a 4st.. as is the case with a 2st..

well.. the last option acc to me wud b 2 change ur gear ratios.. but u dont want 2 touch ur ger box!!

but u r in a very tricky situation since u want increase in ur top speed without any compromise in your acc n FE..
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Old 15th May 2005, 19:02   #7
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Whats the redline of the bike?

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Old 15th May 2005, 19:03   #8
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i think it is 10500rpm where the rpm limiter cuts in.
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Old 15th May 2005, 19:06   #9
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Maybe i'll just wait and see if there are any improvements after 2000kms.i'll add mobil 1 engine oil and see if there is any performance increase.what is the cost of the K&N filter.where do we get it in Borivli
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Old 27th May 2005, 11:47   #10
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As simple as this: put a bigger sprocket at the rear.. say a tooth or two more than stock. This will not only increase your top speed considerably, it will also increase your mileage at the cost of slight decrease in pick up. That's very small considering the new 180 is a very torquey machine, so it shouldn't affect your pickup that much. Ask your mechanic for sprockets.
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Old 31st May 2005, 15:23   #11
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sorry, somehow got posted twice... refer to the above post, please...

Last edited by veyron1 : 31st May 2005 at 15:25.
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Old 31st May 2005, 15:23   #12
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Quote:
Originally Posted by powerslave12r
As simple as this: put a bigger sprocket at the rear.. say a tooth or two more than stock. This will not only increase your top speed considerably, it will also increase your mileage at the cost of slight decrease in pick up. That's very small considering the new 180 is a very torquey machine, so it shouldn't affect your pickup that much. Ask your mechanic for sprockets.

umm... powerslave, i think it's the other way around... if you increase the number of teeth in the rear sprocket, or decrease the front one, you increase the final drive ratio (secondary reduction), hence increasing the acceleration, and sacrificing top end. on the other hand, if you decrease the number of teeth in the rear sprocket, the top end will increase, at the cost of acceleration.... the smaller sprocket, should give more fuel efficiency, but might not do so, keeping in mind that you will have to use more throttle while prodding along in a higher gear at slow speeds....

the front (primary) sprocket in pulsar 180 has 15 teeth, and the rear (secondary) has 42. so, you can't increase the number of teeth in the front sprocket, as it's already the largest one on indian bikes; zma has 14.
try dropping the rear sprocket teeth to 40. should give you a small increase in top end, without sacrificing acceleration, or other factors...

and we can discuss this further when (or if) we meet up after your exams, merve.....
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Old 31st May 2005, 18:46   #13
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Yes veyron you are right. To increase the top end you will have to put a smaller sprocket at rear or a bigger one at front.

@merve_extreme : Dude the low top end is also due to the the shorter wheels. Are you sure the manual mentions top speed ?? am asking because i have 180 DTSi 2003 model & there's no mention of top speed & it wasnt in the classics either.

Also the difference in speedo indicated & true speed will increaseas the speeds increase not much diff but still there will be some. As others have said sprocket change seems like best option thoug it will decrease your pickup, also the mileage in city may go down but will increase on highways(due to shorter rear sprocket the pick up will go down which will result in frequent gear shifts hence drop in mileage in city )

The red line is around 9k-9.5k rpm

porting will reduce mileage & will primarily help in improving midrange.

Putting a Free flow air filter will again not help much in top speed & if it does your mileage will go down.

My personal opinion is dont fiddle with teh stock bike till atleast 5k on the odo that when the true nature of bike is known.

Btw do you use your bike only on weekends kya ? me did 1650 kms in 20 days

Last edited by Technocrat : 31st May 2005 at 18:49.
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Old 31st May 2005, 20:37   #14
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Quote:
Originally Posted by Technocrat
Btw do you use your bike only on weekends kya ? me did 1650 kms in 20 days
techno - hahaha
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Old 1st June 2005, 19:58   #15
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@veyron: My bad! I've said that to like 10 ppl before and all of them were asking for faster pick up. Just got messed up..sorry guys.
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