Go Back   Team-BHP > Under the Hood > In-Car Entertainment


Closed Thread
 
Thread Tools Search this Thread
Old 24th March 2008, 23:41   #1
Senior - BHPian
 
amit_mechengg's Avatar
 
Join Date: Dec 2007
Location: Pune
Posts: 2,411
Thanked: 1,541 Times
Default Urgent Help!!car jerking and slowing with heavy BASS

gurus, i need a help. i have a JBL 75.4 amp and a gt5-12" sub along with JBL gto937 rear speakers. i have used a 8 core battery wire for the amp. also grounding is done with a 8 core wire.
i am facing a strange problem. i was testing my system with some heavy bass test tracks. i find that the head light dimms a bit and when the heavy note of bass is thrown out my alto jerks and i feel that it slows for a second or two and again regains its speed.
is the heavy bass altering either the sparkplug current or the ECU or the injectors or something related to electronics functioning of the car?

is this a common phenomenon? i am worried please help.
amit_mechengg is offline  
Old 24th March 2008, 23:53   #2
Senior - BHPian
 
abhibh's Avatar
 
Join Date: Sep 2005
Location: Back in the HOOD near you!
Posts: 2,767
Thanked: 33 Times
Default

Seems like alternator / battery issue but not sure.
abhibh is offline  
Old 25th March 2008, 00:14   #3
Senior - BHPian
 
amit_mechengg's Avatar
 
Join Date: Dec 2007
Location: Pune
Posts: 2,411
Thanked: 1,541 Times
Default

Quote:
Originally Posted by abhibh View Post
Seems like alternator / battery issue but not sure.
battery is new. amaron. have u faced similar problem?
amit_mechengg is offline  
Old 25th March 2008, 00:42   #4
Senior - BHPian
 
iraghava's Avatar
 
Join Date: Oct 2005
Location: Bhaiyyaland
Posts: 8,028
Thanked: 153 Times
Default

Calling LBM, calling LBM! LBM ji please respond to cars jerking with heavy bass query!
iraghava is offline  
Old 25th March 2008, 00:42   #5
Senior - BHPian
 
Join Date: Mar 2006
Location: Faridabad
Posts: 6,814
Thanked: 294 Times
Default

Here I come..BOOM, BOOM,BOOM

Hmmm

I think your 8 core wire and its terminations might be the culprit

Last edited by low_bass_makker : 25th March 2008 at 00:43.
low_bass_makker is offline  
Old 25th March 2008, 00:55   #6
Senior - BHPian
 
amit_mechengg's Avatar
 
Join Date: Dec 2007
Location: Pune
Posts: 2,411
Thanked: 1,541 Times
Default

Quote:
Originally Posted by low_bass_makker View Post
Here I come..BOOM, BOOM,BOOM

Hmmm

I think your 8 core wire and its terminations might be the culprit
it has been connected from the battery directly to the amp via the fuse without any joints. there is no leakage and the wire is insulated with a tape where it connects to them amp.
amit_mechengg is offline  
Old 25th March 2008, 01:06   #7
Senior - BHPian
 
ramie2400's Avatar
 
Join Date: Nov 2006
Location: Mumbai
Posts: 1,900
Thanked: 58 Times
Default

Your amp is hungry for more power so when you put more volume it tries to pull more power from the battery resulting the lights getting dim.

You might have noticed it happenes only at night when you switch on the HL,it used to happen in my RnD Zen.
ramie2400 is offline  
Old 25th March 2008, 01:43   #8
BHPian
 
redfire's Avatar
 
Join Date: Jan 2008
Location: Chicago, The Windy City
Posts: 444
Thanked: 12 Times
Default

The amp is drawing too much power from your battery. The alternator may also suffer due to this. Try lowering the gain in amp and incresing the HU volume. Heard a mechanism of intsalling capacitors between battery power and amp, so that amp will get a constant good power. Search for it (google has many links) and try that. I am also planning this, though I have no issues with my amp + sub system.
redfire is offline  
Old 25th March 2008, 05:48   #9
BANNED
 
Join Date: Jun 2007
Location: Noida
Posts: 612
Thanked: 10 Times
Default

Get a branded 8ga wire. maybe finolex.
heavy load on the battery might cause the car to act weird. my car's timing advancer went kaput due to low/high voltage which inturn blew the TPS. However i have a better TA and no problems.

Capacitors won't help you. your amp is on diet, the supply is strong enough but the connections are weak. so the chances are your cables are faulty. get scosche/monster cables. also, check if the ground connection is clean.
saintsinner is offline  
Old 25th March 2008, 08:22   #10
Senior - BHPian
 
vikram_d's Avatar
 
Join Date: Jul 2006
Location: Bangalore
Posts: 2,380
Thanked: 936 Times
Default

Me thinks it's an alternator problem or the headlight relays are not working. But headlight relays do not explain the sluggish response from the car.

Must be the alternator.
vikram_d is offline  
Old 25th March 2008, 10:04   #11
Senior - BHPian
 
panky12345's Avatar
 
Join Date: Mar 2006
Location: New Delhi
Posts: 2,652
Thanked: 126 Times
Default

step by step: upgrade the power & ground cables, BIG 3 and still if the problem persists (highly unlikely), please upgrade the battery.
panky12345 is online now  
Old 25th March 2008, 10:45   #12
Senior - BHPian
 
DerAlte's Avatar
 
Join Date: Mar 2007
Location: Bangalore
Posts: 8,076
Thanked: 2,876 Times
Default

The energy being pumped into the sub has to come from somewhere, right? In this case, it is the alternator. The more the current the amp circuit is drawing, the more mechanical load it is placing on the engine to cater to the electrical load.

The light Alto engine is unable to keep up (that's what you are sensing as 'slowing down'; happens also when the AC goes on). Also, since the electrical load is more than the alternator rating, the voltage regulator is unable to regulate the voltage - which you see as the 'headlight becoming dim'.

To get the same level of punch (your basic problem), you either need a more sensitive sub (one that produces louder sound with lesser electrical power), or change the alternator to a higher rating.
DerAlte is offline  
Old 25th March 2008, 10:48   #13
Senior - BHPian
 
amit_mechengg's Avatar
 
Join Date: Dec 2007
Location: Pune
Posts: 2,411
Thanked: 1,541 Times
Default

the light dimming is very less. its not that they go too much dim. but i was moving at very low rpm on 2nd gear while listening to heavy bass testers. i could feel that during the bass beat the car got sluggish and as soon as the beat goes my car moves as normal.
the power cable and ground cable are brand new and properly insulated. is it because of testing the heavy bass at loud volume?
amit_mechengg is offline  
Old 25th March 2008, 10:50   #14
Senior - BHPian
 
amit_mechengg's Avatar
 
Join Date: Dec 2007
Location: Pune
Posts: 2,411
Thanked: 1,541 Times
Default

Quote:
Originally Posted by DerAlte View Post
The energy being pumped into the sub has to come from somewhere, right? In this case, it is the alternator. The more the current the amp circuit is drawing, the more mechanical load it is placing on the engine to cater to the electrical load.

The light Alto engine is unable to keep up (that's what you are sensing as 'slowing down'; happens also when the AC goes on). Also, since the electrical load is more than the alternator rating, the voltage regulator is unable to regulate the voltage - which you see as the 'headlight becoming dim'.

To get the same level of punch (your basic problem), you either need a more sensitive sub (one that produces louder sound with lesser electrical power), or change the alternator to a higher rating.
that will be a costly affair . what if i reduce the gains on the amp and increase them on the HU ??
amit_mechengg is offline  
Old 25th March 2008, 11:10   #15
Senior - BHPian
 
DerAlte's Avatar
 
Join Date: Mar 2007
Location: Bangalore
Posts: 8,076
Thanked: 2,876 Times
Default

Quote:
Originally Posted by amit_mechengg View Post
...is it because of testing the heavy bass at loud volume?
Yes. The louder you play, more the electrical / mechanical demand.
Quote:
Originally Posted by amit_mechengg View Post
... what if i reduce the gains on the amp and increase them on the HU ??
The power requirement even in that case would be the same.
DerAlte is offline  
Closed Thread


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Heavy Commercial Vehicle Sales slowing down. Recessionary Trend? anjan_c2007 Commercial Vehicles 6 7th March 2013 16:20
Help with NHC jerking engine and brakes, Power windows and tyres drsnt Technical Stuff 4 14th April 2010 20:39
PE deals fall apart in M&A Street - Indian economy slowing down?? nishantgandhi Shifting gears 0 21st April 2008 11:00
Jerking sound from skoda..please help me. jerish666 Technical Stuff 6 23rd December 2006 01:41


All times are GMT +5.5. The time now is 13:14.

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