Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 27th March 2005, 15:40   #1
Senior - BHPian
 
v1p3r's Avatar
 
Join Date: Feb 2005
Location: BLR - chasing cars...
Posts: 4,836
Thanked: 26 Times
Default Questions and answers...

I've been thinking about a few things, and I can't figure them out, so I'm putting the questions to you, fellow TBHPians, for some answers...

1. Why doesn't a cold air induction kit start on the hood? Wouldn't it be easier to make a hood scoop and have the filter/pipe rest there, than near the air-dam and run the risk of water?

2. Why should ABS take longer to stop on dusty roads (I don't think it's true)?

3. If 93 or 95 RON makes the engine sound smoother, shouldn't it run that much quicker?

Got quite a few of these running around in my head. Will add them as and when they crop up.

Cheers


Viper
v1p3r is offline   Reply With Quote
Old 27th March 2005, 15:54   #2
Senior - BHPian
 
Shan2nu's Avatar
 
Join Date: Feb 2004
Location: Hubli - Karnata
Posts: 5,525
Thanked: 87 Times
Default

Quote:
2. Why should ABS take longer to stop on dusty roads (I don't think it's true)?
Actually it's the other way around. ABS should reduce stopping distance on slippery surfaces. Max traction is only available when there is maximum braking force without wheel lockup.

Ofcourse, there are chances that you might come across a car with ABS, which is beaten by a another non ABS car, in terms of stopping distance. That's bcoz braking depends on many other factors like tyre width, tyer compound, tyre and surface temperature, weight of the vehicle etc, i think weight transfer (under braking) can also be added to the list.

ABS, does not necessarily stop your car before you hit the on coming object. It just gives you the freedom to steer your car around it without wheel lockup.

Try this page for more info on ABS.

Shan2nu

Last edited by Shan2nu : 27th March 2005 at 16:00.
Shan2nu is offline   Reply With Quote
Old 27th March 2005, 16:27   #3
Senior - BHPian
 
Shan2nu's Avatar
 
Join Date: Feb 2004
Location: Hubli - Karnata
Posts: 5,525
Thanked: 87 Times
Default

Quote:
3. If 93 or 95 RON makes the engine sound smoother, shouldn't it run that much quicker?
You will only see significant changes in engine refinement if your car wasn't meant to be run on 87 octane.

Between 87 and 91 octane, i do find some improvement but between 91 and 93 octane, there's no diff, which can be pointed out, on my car atleast.

Higher the octane, higher the potential energy possesed by the fuel but, tapping that energy requires a higher compression ratio, unless your car has enuf compression to extract every bit of energy from 93 octane, you shouldn't see any diff in performance.

Shan2nu

Last edited by Shan2nu : 27th March 2005 at 16:38.
Shan2nu is offline   Reply With Quote
Old 27th March 2005, 17:41   #4
Senior - BHPian
 
drifter's Avatar
 
Join Date: Sep 2004
Location: Bombay
Posts: 1,469
Thanked: 13 Times
Default

Quote:
1. Why doesn't a cold air induction kit start on the hood? Wouldn't it be easier to make a hood scoop and have the filter/pipe rest there, than near the air-dam and run the risk of water?
That is the same reason why scoops arent used. Protection from rains.

Drifter
drifter is offline   Reply With Quote
Old 27th March 2005, 21:27   #5
Senior - BHPian
 
iceman91's Avatar
 
Join Date: Nov 2004
Location: melbourne/bangalore
Posts: 1,958
Thanked: 22 Times
Default

a cold air induction kit is pretty much in the engine bay. it is just that an air box is not used and it is at the air dam.
yes it does get dirty faster than a stock unit but prople who use this are more performance oriented and do not mind the extra cleaning/maintenance required.
iceman91 is offline   Reply With Quote
Old 27th March 2005, 21:31   #6
Senior - BHPian
 
iceman91's Avatar
 
Join Date: Nov 2004
Location: melbourne/bangalore
Posts: 1,958
Thanked: 22 Times
Default

also if something is running smoother does not make it quicker. its just that it is "well fed"
as long as the engine is runing at its optimum putting in higher octane fuel wont make it "faster" but an engine which requires higher octane but was using lower octane and u have recently switched to higher will be quicker and have better overall efficiency.
iceman91 is offline   Reply With Quote
Old 27th March 2005, 21:48   #7
Senior - BHPian
 
v1p3r's Avatar
 
Join Date: Feb 2005
Location: BLR - chasing cars...
Posts: 4,836
Thanked: 26 Times
Default

Hey guys,

Thanks for all the info.

@ drifter... you can design a scoop with a leading upper lip or hood which would minimize rain entry and yet be away from the airdam or any road dirt.

@iceman...i switched from 91 to 93 in my stock baleno, and while i haven't checked figures, it certainly feels smoother. my point is, if it is smoother, it burns better, and thus energy released must be greater.

@shantanu...in another post, some members had mentioned that in some cases, ABS takes longer to stop than normal brakes, these cases being dusty roads etc. I wasn't convinced, and what you said is basically what i've thought all along. thanks for the confirm.


iceman, which vtec did you smoke now?!
v1p3r is offline   Reply With Quote
Old 27th March 2005, 22:36   #8
Senior - BHPian
 
Shan2nu's Avatar
 
Join Date: Feb 2004
Location: Hubli - Karnata
Posts: 5,525
Thanked: 87 Times
Default

Quote:
my point is, if it is smoother, it burns better, and thus energy released must be greater.
Yes, there could be a slight increase in power due to the nature of 93 octane, compared to 91 but, i don't think the diff in power would be enuf to see any commendable improvement in performance.

Shan2nu
Shan2nu is offline   Reply With Quote
Old 27th March 2005, 22:36   #9
Senior - BHPian
 
drifter's Avatar
 
Join Date: Sep 2004
Location: Bombay
Posts: 1,469
Thanked: 13 Times
Default

I always thought the hoodscoop is a better idea than placing the filter near the airdam. But then also ... either ways...you have to be more careful.

By the way iceman....just love your signature.

Drifter
drifter is offline   Reply With Quote
Old 28th March 2005, 11:47   #10
Team-BHP Support
 
Rehaan's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 22,364
Thanked: 22,568 Times
Default

Quote:
Originally Posted by v1p3r
...in another post, some members had mentioned that in some cases, ABS takes longer to stop than normal brakes, these cases being dusty roads etc. I wasn't convinced, and what you said is basically what i've thought all along. thanks for the confirm.
Hey V1p3r,

It IS true that non-ABS cars brake faster than ABS equipped cars in certain conditions. ie sand/dust/snow.

The advantage non-ABS has in these conditions is the fact that when the wheels lock up -
  • They dig through the loose top layer
  • They cause a berm of mud/snow in front of the tire
...which helps a lot in slowing down the car.

If you ever stand at a stop sign on a snowy day(hehe..yeah..goodluck), you will see cars approaching and slowing down, and just when they are about to reach a standstil the ABS lets off the brake pressure coz the wheels are locked and the car jumps a 6-12" forward, and this happens 2-3times before the car comes to a stop.

In the end its very specific to conditions and driving styles, as well as quality and type of ABS system.
However, i just wanted to explain this aspect to you, hope you see how it makes sense now?

Quote:
3. If 93 or 95 RON makes the engine sound smoother, shouldn't it run that much quicker?
Yes, ie if you upgrade from a lower than specified octane for your engine to the specified octane fuel for your engine.
According to me, there will be less pre-ignition/detonation; hence = smoother / more power.
And the ECU will not retard the ignition timing to prevent pre-ignition; = more power.

cya
R

Last edited by Rehaan : 28th March 2005 at 11:52.
Rehaan is offline   Reply With Quote
Old 28th March 2005, 12:02   #11
Senior - BHPian
 
Shan2nu's Avatar
 
Join Date: Feb 2004
Location: Hubli - Karnata
Posts: 5,525
Thanked: 87 Times
Default

Quote:
It IS true that non-ABS cars brake faster than ABS equipped cars in certain conditions. ie sand/dust/snow.

The advantage non-ABS has in these conditions is the fact that when the wheels lock up -
They dig through the loose top layer
They cause a berm of mud/snow in front of the tire
...which helps a lot in slowing down the car.
Yes, that's true but, it also depends on how dusty the road is. A well laid tarmac with a thin layer of dust wont do any good.

Shan2nu
Shan2nu is offline   Reply With Quote
Old 28th March 2005, 21:27   #12
Senior - BHPian
 
iceman91's Avatar
 
Join Date: Nov 2004
Location: melbourne/bangalore
Posts: 1,958
Thanked: 22 Times
Default

thanks drifter...now i am going on to the OTHER side....RHCP...awesome song.
iceman91 is offline   Reply With Quote
Old 29th March 2005, 08:13   #13
Team-BHP Support
 
Join Date: Feb 2004
Location: Bangalore
Posts: 11,882
Thanked: 9,696 Times
Default

Quote:
Originally Posted by drifter
I
By the way iceman....just love your signature.

Drifter
I don't think Shan2unu will be on talking terms with you now !
ajmat is offline   Reply With Quote
Old 29th March 2005, 09:44   #14
Senior - BHPian
 
iceman91's Avatar
 
Join Date: Nov 2004
Location: melbourne/bangalore
Posts: 1,958
Thanked: 22 Times
Default

haha..its all in good fun. i dont think he will mind. what say shantanu?
iceman91 is offline   Reply With Quote
Old 29th March 2005, 11:34   #15
Senior - BHPian
 
Shan2nu's Avatar
 
Join Date: Feb 2004
Location: Hubli - Karnata
Posts: 5,525
Thanked: 87 Times
Default

Quote:
haha..its all in good fun. i dont think he will mind. what say shantanu?
Doesn't bother me. Maybe bcoz even i know that his tuned Baleno is capable of beating a stock Vtec.

Shan2nu
Shan2nu is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Honda CBR 250R : Answers to some commonly asked questions aargee Motorbikes 433 11th July 2017 21:31
Interview on Radio - Please suggest motorcycling topics, questions & answers! barcalad Motorbikes 54 24th March 2016 18:25
Stupid questions with the smart answers 2fast2furious Shifting gears 12 23rd August 2004 14:33
Get answers to your audio questions satish_appasani In-Car Entertainment 1 11th August 2004 03:30


All times are GMT +5.5. The time now is 21:40.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks