Car Alternator or Battery Issue

Discussion in 'Car Talk' started by Mitevo7, Feb 8, 2019.

  1. gunnerzz

    gunnerzz 5 Year | Silver

    Joined:
    Jul 3, 2014
    Messages:
    1,679
    Likes Received:
    535
    dual speed fan?
     
    Mitevo7 likes this.
  2. Mitevo7

    Mitevo7 Senior Member
    Senior Member

    Joined:
    Jan 14, 2008
    Messages:
    1,072
    Likes Received:
    115
    Hi,

    The drop is momentary and recover back to 13.3-13.4, this was taken only during idling. I am not 1JZ ECU is OB2 compliant or not, but can we actually tune up the idling RPM so that the idling charge is enough?

    Thanks,
    Ken
     
  3. Mitevo7

    Mitevo7 Senior Member
    Senior Member

    Joined:
    Jan 14, 2008
    Messages:
    1,072
    Likes Received:
    115
    From the sound of it when its activated, it looks like a dual speed fan. I remembered there was a year when the original cooling fan will constantly tuned into highspeed mode (real loud from the outside when its spinning very quick) and slow down to normal fan speed after engine reached warm up temperature, in the end we found out the fan switch is faulty and constantly putting the fan into highspeed mode. That burned out the motor pretty quick.

    Thanks,
    Ken
     
  4. Mitevo7

    Mitevo7 Senior Member
    Senior Member

    Joined:
    Jan 14, 2008
    Messages:
    1,072
    Likes Received:
    115
    Folks,

    I have been seeing online and found there's alternator voltage booster module available for certain type of cars. Wondering is there such devices in Malaysia to help with my current issue ?

    Thanks,
    Ken
     
  5. Izso

    Izso Boooooossst
    Helmet Clan Moderator

    Joined:
    Mar 28, 2004
    Messages:
    14,439
    Likes Received:
    6,177
    Which booster you read up about?
     
  6. Mitevo7

    Mitevo7 Senior Member
    Senior Member

    Joined:
    Jan 14, 2008
    Messages:
    1,072
    Likes Received:
    115
  7. Izso

    Izso Boooooossst
    Helmet Clan Moderator

    Joined:
    Mar 28, 2004
    Messages:
    14,439
    Likes Received:
    6,177
    Ah... I would not use those things.

    I like this guys videos, might help you :
     
    Mitevo7 and vr2turbo like this.
  8. Mitevo7

    Mitevo7 Senior Member
    Senior Member

    Joined:
    Jan 14, 2008
    Messages:
    1,072
    Likes Received:
    115
    Alternator returned fine, only at low rpm the charging seems inadequate. Besides increasing the RPM (which is out at this moment), i ran out of option to try to increase the voltage output, earth cables are fine and can't seems there's much resistance in the system. Hence comes to this booster module.

    Thanks,
    Ken
     
  9. gunnerzz

    gunnerzz 5 Year | Silver

    Joined:
    Jul 3, 2014
    Messages:
    1,679
    Likes Received:
    535
    Did u check or is there any way to check the alternator output at the source meaning at the alternator itself.

    After reading this all over again i think there is a bad connection somewhere.
     
  10. vr2turbo

    vr2turbo 5 Year | Silver
    Helmet Clan Moderator

    Joined:
    May 11, 2010
    Messages:
    28,875
    Likes Received:
    8,106
    But the charge is fine with accessories off, pass 14v....
     
  11. ^pomen_GTR^

    ^pomen_GTR^ Senior Member
    Senior Member

    Joined:
    May 13, 2010
    Messages:
    7,499
    Likes Received:
    1,685

    i see... from the way you describe it...


    my suspect would be the alternator amperage not enough for your bimmer electrical...changing into bigger amperage alternator would help in solving this issue...
     
  12. ^pomen_GTR^

    ^pomen_GTR^ Senior Member
    Senior Member

    Joined:
    May 13, 2010
    Messages:
    7,499
    Likes Received:
    1,685

    the voltage should be sufficient... but the amperage problably fell below than what the car body electrical demands... (load too much supply too little)
     
  13. Izso

    Izso Boooooossst
    Helmet Clan Moderator

    Joined:
    Mar 28, 2004
    Messages:
    14,439
    Likes Received:
    6,177
    I'm still debating whether that tiny little booster wire is going to help you. Looking at the thing itself, it looks like it'll probably have some diode to upscale the V, but this will reduce the amperage I suspect and something else is going to suffer
     
  14. ^pomen_GTR^

    ^pomen_GTR^ Senior Member
    Senior Member

    Joined:
    May 13, 2010
    Messages:
    7,499
    Likes Received:
    1,685

    i'm more afraid that when this device increase the voltage during load,

    it will over-volt the system when the load is taken off from the system (like when fan turns off and ac turns off)

    unless if the system auto compensate when the load if lower and keep true to 14v limit
     
  15. gunnerzz

    gunnerzz 5 Year | Silver

    Joined:
    Jul 3, 2014
    Messages:
    1,679
    Likes Received:
    535
    I just finished reading an experiment paper by Utem student on car alternator.

    Lots of interesting info abt alternator such as;
    -normally alternator rating is the output it produce when its (the alternator) spinning at 6k rpm. With 1:2 ratio, thats 3k rpm engine speed.
    -alternator will produce >12v to overcome the battery internal resistance in order to be able to charge it.

    Apart from the basic higher speed will produce more current i also learnt one interesting thing;

    In the paper they mentioned about crankshaft-alternator speed ratio. Normal car is 1:2 which means 1k rpm on crank is 2k rpm on alternator. This means to make the alternator produce more output during engine idle we can play with this ratio by changing the pulley size so it spins faster right?
     
  16. ^pomen_GTR^

    ^pomen_GTR^ Senior Member
    Senior Member

    Joined:
    May 13, 2010
    Messages:
    7,499
    Likes Received:
    1,685

    they got it wrong.. (although i'm from utem myself :rofl: )

    car alternator doesnt operate on 2:1 pulley ratio...its more than that.. probably atleast 3:1 or 4:1 (see the alternator pulley size vs crank pulley size to get the idea)

    2:1 is crankshaft to camshaft ratio....



    yes u can change the alternator pulley into smaller one (or bigger crankpulley) to increase the rpm ratio between those 2...

    problem is on the market, most is people selling under-drive pulley (which lower the ratio and effective rpm of alternator) for race purpose and use it on the street (wrong concept)....

    the reason of under-drive pulley invented for racing purpose, race engine never saw rpm lower than 4.5k rpm...it will spend most of the time at high rpm range..so to reduce alternator speed damage (as well as power steering pump)...race car build install the under-drive pulley....

    installing under-drive pulley will make alternator (and power steering pump and ac compressor) working under its designated speed make it worst in slow moving traffic or on idle during traffic jam...

    what people on the street is over-drive pulley...

    in this jz bimmer case, is ideal solution (if not changing bigger amperage alternator)....but since sourcing the over-drive pulley which definately need to be custom made is freakin expensive, then bigger alternator is the simplest route to follow... because bigger alternator is more common mod especially in car audio shop...
     
  17. parakey

    parakey Senior Member
    Senior Member

    Joined:
    Apr 30, 2012
    Messages:
    1,049
    Likes Received:
    158
    +1
     
  18. gunnerzz

    gunnerzz 5 Year | Silver

    Joined:
    Jul 3, 2014
    Messages:
    1,679
    Likes Received:
    535
    Good additional info...
     
  19. parakey

    parakey Senior Member
    Senior Member

    Joined:
    Apr 30, 2012
    Messages:
    1,049
    Likes Received:
    158
    You may change to a smaller alternator pulley to increase the rpm but wont that place a larger idle load on the engine? He's already complaining it's not idling well
     
  20. Mitevo7

    Mitevo7 Senior Member
    Senior Member

    Joined:
    Jan 14, 2008
    Messages:
    1,072
    Likes Received:
    115
    I would agree to changing higher amp alternator, the stock 1jz alternator possibly isn't big enough to supply to all those gizmos in the beemer.

    I am thinking of 2JZ alternator instead as it is still affordable. What's your opinion?

    Thanks,
    Ken
     

Share This Page