Changing to a bigger alternator

[Upguy1]

for better or for worse ???

 

I know its good for ICE...any other benefits ?

[Nitrous]

may add on more drag on ur engine. so more sluggish performance.

[Jonbummer]

on the contrary, i think bigger alternator may charge

the batt better and hence less taxing on the engine itself.

 

however, cannot have too big a alternator. it has to be

in proportion to the batt the car is having on board.

 

cheers

[Yeobh]

What you need to do is to do a total amp requirement audit. Once you know yr total requirement and with 20% extra to meet yr future additions,from here you can then proceed to size up the right alternator and also decide whether you want to stick to one battery or two batteries ( or maybe more)

[QQDreamer]

sorry am digging this old thread. How abt upgrading from 75A to 90A amp. any impact? Good or worst? How to do the calculation?

[Gee]

I think you just sum up the Amps needed against how much the batt can provide?

Probably consider the additional (e.g. total ICE amperage) Cmiiw

[QQDreamer]

my batt is 45Amp only

[QQDreamer]

do i need to replace the batt if i upgrade to a bigger alternator to 90A? the alternator is actually meant for 1.6 model. Mine is a 1.5 model

[5936]

Up size it. Its good,especially for years to come

[Vertigoer]

  On 5/16/2012 at 4:40 AM, 5936 said:

Up size it. Its good,especially for years to come

 

Years to come the car would probably be sold off.

 

If the purpose is ICE, better to install capacitor to "average" out the peak and mid.

Alternator cannot give the sudden increase in power requirement, e.g. a strong "thump" on the woofer.

 

Unless you have extreme power equipments installed?

[QQDreamer]

  On 5/16/2012 at 4:40 AM, 5936 said:

Up size it. Its good,especially for years to come

 

so meaning to say i need to upgrade my battery as well? Any idea what amp of battery to upgrade to? 55amp? any calculations involved?

[5936]

The original 45amp alternator will take care of all the current loadings.

You need to know what you added, such as amps or higher wattage bulbs,etc

 

 

[QQDreamer]

  On 5/17/2012 at 7:37 AM, 5936 said:

The original 45amp alternator will take care of all the current loadings.

You need to know what you added, such as amps or higher wattage bulbs,etc

 

My Current alternator is 75A not 45A. The 45A is my battery amp currently. Doing this upgrade will effect any BBQ??

[Tigershark1976]

  On 5/17/2012 at 9:32 AM, MkMan said:

My Current alternator is 75A not 45A. The 45A is my battery amp currently. Doing this upgrade will effect any BBQ??

If you are not sure whether to upgrade, it means you dont need it....

 

Take alternator as a HP charger, ask yourself whether you need a higher capacity HP charger that would allow you to fully charge your HP 1/2 of the time compare to your original charger?? especially if you are those type who seldom use your HP? and always stay in Office/home where you can charge your HP batter as often as you need??

 

A bigger alternator could charge up your battery faster, at the expenses of you car HP and fuel consumption. So, if you dont need it, why do you want to degrade your car performance yet spending more $$$ on fuel??

 

I can only think of 2 situations where a bigger alternator is needed.

 

1) car with plenty of power hungry gadget...

2) car that travels very short distance + rarely use.... (in this case, the better option is to sell off the car, instead of upgrading to a higher rating alternator)