Urgent Help!!car jerking and slowing with heavy BASS - Team-BHP

amit_mechengg · 24th March 2008, 23:41

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.

abhibh · 24th March 2008, 23:53

Seems like alternator / battery issue but not sure.

amit_mechengg · 25th March 2008, 00:14

Quote:

Originally Posted by abhibh

Seems like alternator / battery issue but not sure.

battery is new. amaron. have u faced similar problem?

iraghava · 25th March 2008, 00:42

Calling LBM, calling LBM! LBM ji please respond to cars jerking with heavy bass query!

low_bass_makker · 25th March 2008, 00:42

Here I come..BOOM, BOOM,BOOM

Hmmm

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

amit_mechengg · 25th March 2008, 00:55

Quote:

Originally Posted by low_bass_makker

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.

ramie2400 · 25th March 2008, 01:06

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.

redfire · 25th March 2008, 01:43

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.

saintsinner · 25th March 2008, 05:48

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.

vikram_d · 25th March 2008, 08:22

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.

panky12345 · 25th March 2008, 10:04

step by step: upgrade the power & ground cables, BIG 3 and still if the problem persists (highly unlikely), please upgrade the battery.

DerAlte · 25th March 2008, 10:45

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.

amit_mechengg · 25th March 2008, 10:48

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 · 25th March 2008, 10:50

Quote:

Originally Posted by DerAlte

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 ??

DerAlte · 25th March 2008, 11:10

Quote:

Originally Posted by amit_mechengg

...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

... 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.

24th March 2008, 23:41	#1 (permalink)
amit_mechengg BHPian Join Date: Dec 2007 Location: Pune Posts: 716 View My Garage	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. __________________ " I dont Drive Fast , I Fly Slowly "

24th March 2008, 23:53	#2 (permalink)
abhibh Senior - BHPian Join Date: Sep 2005 Location: In the Hood Near You Posts: 1,538	Seems like alternator / battery issue but not sure. __________________ For every idiot there is an equal and opposite gender idiot. Singles are people with incomparable intelligence!

25th March 2008, 00:42	#4 (permalink)
iraghava Distinguished - BHPian Join Date: Oct 2005 Location: Bhaiyyaland Posts: 7,256 View My Garage	Calling LBM, calling LBM! LBM ji please respond to cars jerking with heavy bass query! __________________ There is a very fine line between "Hobby" and "Mental Illness".

25th March 2008, 00:42	#5 (permalink)
low_bass_makker Senior - BHPian Join Date: Mar 2006 Location: Faridabad Posts: 5,748 View My Garage	Here I come..BOOM, BOOM,BOOM Hmmm I think your 8 core wire and its terminations might be the culprit __________________ Looks Can Be Deceiving Last edited by low_bass_makker : 25th March 2008 at 00:43.

25th March 2008, 01:06	#7 (permalink)
ramie2400 Senior - BHPian Join Date: Nov 2006 Location: Mumbai Posts: 1,206	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. __________________ Honda ( I V I ( 1.8 M/T V Getz Prime 1.3GLS *(ICED)* Graduated from "University of Error's"

25th March 2008, 01:43	#8 (permalink)
redfire BHPian Join Date: Jan 2008 Location: Trivandrum Posts: 315 View My Garage Infractions: 0/1 (7)	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. __________________ jay Most automobiles problems are caused by the loose nut that connects the steering to the saddle

25th March 2008, 05:48	#9 (permalink)
saintsinner BHPian Join Date: Jun 2007 Location: Noida Posts: 323	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. __________________ 2006 Accent GLE 2007 Scorpio 4X4

25th March 2008, 08:22	#10 (permalink)
vikram_d BHPian Join Date: Jul 2006 Location: Bangalore Posts: 717 View My Garage	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. __________________ I'm loving it.

25th March 2008, 10:04	#11 (permalink)
panky12345 Senior - BHPian Join Date: Mar 2006 Location: New Delhi Posts: 1,407	step by step: upgrade the power & ground cables, BIG 3 and still if the problem persists (highly unlikely), please upgrade the battery. __________________ Yehi hota hai toh aakhir yahi hota kyun hai??

25th March 2008, 10:45	#12 (permalink)
DerAlte Team-BHP Moderator Join Date: Mar 2007 Location: Bangalore Posts: 1,617	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. __________________ Never believe it cannot be done - it's only that you haven't found out how!!!

25th March 2008, 10:48	#13 (permalink)
amit_mechengg BHPian Join Date: Dec 2007 Location: Pune Posts: 716 View My Garage	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? __________________ " I dont Drive Fast , I Fly Slowly "

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