Alternator Q's
Thread Starter
Honda-Tech Member
Joined: Oct 2003
Posts: 1,775
Likes: 0
From: www.rideekulo.us
Alternator Q's
I have a 98 ITR (B18C5), I believe the stock alternator puts out 90 amps. Well it has gone bad. I have the option of getting a 00 ITR alternator, what amps does that put out? Also, is there somewhere I can call or order a higher output from, like 120 amps?
Help is urgent, thanks.
Help is urgent, thanks.
New User
Joined: Jun 2001
Posts: 1,963
Likes: 0
From: San Francisco, CA, USA
I have no clue what the ITR one will put out, but I doubt it will be different (significantly) then the factory integra one.
High output alternators are strange animals. If you want a rewind that uses the same case as the factory one, you will find that idle perfomance suffers, and it will be a larger drag on your engine, robing horsepower.
I'd take a look at what your accessories will draw from your charging system, then weigh the tradeoffs.
High output alternators are strange animals. If you want a rewind that uses the same case as the factory one, you will find that idle perfomance suffers, and it will be a larger drag on your engine, robing horsepower.
I'd take a look at what your accessories will draw from your charging system, then weigh the tradeoffs.
New User
Joined: Jun 2001
Posts: 1,963
Likes: 0
From: San Francisco, CA, USA
Re: (rcurley55)
I did some additional searching at http://www.4alterstart.com
According to them, the B18C5 on a 2000 ITR came with a 90A alternator from the factory.
They also have aftermarket alternators that are around $250 for a 150A alternator. They claim both a lifetime warranty and that they put out 70A at idle.
Hmm, and I just found out my Si only puts out 80A...grrrr
According to them, the B18C5 on a 2000 ITR came with a 90A alternator from the factory.
They also have aftermarket alternators that are around $250 for a 150A alternator. They claim both a lifetime warranty and that they put out 70A at idle.
Hmm, and I just found out my Si only puts out 80A...grrrr
Farts in the shower
Joined: Jun 2003
Posts: 15,559
Likes: 0
From: Colorado
Re: (rcurley55)
Majority of higher output alternators only take a little bit if any hp, the pulley should be same size otherwise you would have to buy new belts to fit it. My thing is if you just running a system add a cap, if you wanting it to produce more electricy thus more spark (not very true) add an ignition system, you will get added hp and better response just my 2 pennies.
New User
Joined: Apr 2001
Posts: 3,129
Likes: 0
From: Los Angeles, CA, USA
Re: (rcurley55)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rcurley55 »</TD></TR><TR><TD CLASS="quote">
Hmm, and I just found out my Si only puts out 80A...grrrr</TD></TR></TABLE>
The wrx is 75 amps and it comes with foglights standard. I don't think it will live too long. WTF was subaru thinking.
Hmm, and I just found out my Si only puts out 80A...grrrr</TD></TR></TABLE>
The wrx is 75 amps and it comes with foglights standard. I don't think it will live too long. WTF was subaru thinking.
New User
Joined: Jun 2001
Posts: 1,963
Likes: 0
From: San Francisco, CA, USA
Re: (vteg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteg »</TD></TR><TR><TD CLASS="quote">
The wrx is 75 amps and it comes with foglights standard. I don't think it will live too long. WTF was subaru thinking.</TD></TR></TABLE>
The better question is why people can't think like VW - 120A bosch units on all Jettas and GTIs
The wrx is 75 amps and it comes with foglights standard. I don't think it will live too long. WTF was subaru thinking.</TD></TR></TABLE>
The better question is why people can't think like VW - 120A bosch units on all Jettas and GTIs
Trending Topics
New User
Joined: Jun 2001
Posts: 1,963
Likes: 0
From: San Francisco, CA, USA
Re: (PupaScoopa)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PupaScoopa »</TD></TR><TR><TD CLASS="quote">Has anyone found a way (or are the specs available) to find the drag an alternator presents to the engine when at idle and at load?</TD></TR></TABLE>
Not that I know of, but ask anyone who has put a 200A alternator on a tiny engine, and they will tell you that they could definitley feel it.
Not that I know of, but ask anyone who has put a 200A alternator on a tiny engine, and they will tell you that they could definitley feel it.
Farts in the shower
Joined: Jun 2003
Posts: 15,559
Likes: 0
From: Colorado
Re: (rcurley55)
If you go to autozone or any other car parts store and ask them to "test" out your alternator....they should be albe to tell you your load amps and your idle amps and subtract what your car alternator should be putting out versus what it is...this will be your drag at load and idle (hope this helps)
New User
Joined: Jun 2001
Posts: 1,963
Likes: 0
From: San Francisco, CA, USA
Re: (VRDrvr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by VRDrvr »</TD></TR><TR><TD CLASS="quote">If you go to autozone or any other car parts store and ask them to "test" out your alternator....they should be albe to tell you your load amps and your idle amps and subtract what your car alternator should be putting out versus what it is...this will be your drag at load and idle (hope this helps)</TD></TR></TABLE>
All that tells you is the actual output of your alternator....tells you nothing about the parasitic losses that the alternator will place on the engine....
All that tells you is the actual output of your alternator....tells you nothing about the parasitic losses that the alternator will place on the engine....
New User
Joined: Apr 2001
Posts: 3,129
Likes: 0
From: Los Angeles, CA, USA
Re: (PupaScoopa)
I was going to say assume 50% efficient, but I found this page which says 45% http://www.mit.edu/people/afri....html
Anyway one hp is around 750 watts if I remember correctly. So if you take the alternator output (300 amps for example
) multiply it by voltage (14.5) = 4350 watts. Divide by the efficiency = 9667, and divide by 750 to get hp = 13.
Hot alternators make less power. I assume the 45% efficiency is worst case scenario.
Anyway one hp is around 750 watts if I remember correctly. So if you take the alternator output (300 amps for example
) multiply it by voltage (14.5) = 4350 watts. Divide by the efficiency = 9667, and divide by 750 to get hp = 13.Hot alternators make less power. I assume the 45% efficiency is worst case scenario.
Thread
Thread Starter
Forum
Replies
Last Post
