charging issues
Thread Starter
TECH Enthusiast
Joined: Sep 2008
Posts: 636
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From: Cheshire, CT
charging issues so i had the bbk underdrive pulley and was getting low charges at idle. it would hand around 1/4 when idling and shoot up when i would accelerate. so i thought it was due to the alternator not being turned enough. so i went and bought the asp pulley kit which included the alternator and crank pulley. still the same problems. however, i notice the car only idles low after i drive it for about 2 minutes. when it starts up and idles, it idles fine. any ideas guys?
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You have a valid point, my error. I checked my stock tune, and its settings are as follows:
Cold (1200 rpm at insanely low temps, 1000 up to 89 degrees, F, both in neutral).
Warm 650 rpm in neutral, 550 in gear (approx. 200 F).
Cold (1200 rpm at insanely low temps, 1000 up to 89 degrees, F, both in neutral).
Warm 650 rpm in neutral, 550 in gear (approx. 200 F).
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Not gonna help your low voltage problem. Thread Starter
TECH Enthusiast
Joined: Sep 2008
Posts: 636
Likes: 0
From: Cheshire, CT
So I've learned that the asp pulley kit was completely useless to me haha I had the bbk pulley and got low charges so I bought the asp pullies thinking it would fix the charges not knowing the alt pulley was BIGGER haha oh well time to pick up a smaller pulley at my race shop or order the march pulley from summit and measure what size belt ill need *sigh*
So, before you spend any more money, stand back and think for a moment.
First, you now have 2 crank pulleys and 2 alternator pulleys, right?
Second, the important factor here is not the absolute diameter of each pulley, but the relative size in relation to each other. Let me give some examples:
a) C1 pulley is 6 in diameter, A1 pulley is 2 in diameter. This is a ratio of 3:1.
b) C2 pulley is 4 in diameter, A2 pulley is 1 in diameter. This is a ratio of 4:1.
c) C2 pulley matched with A1 pulley is a ratio of 2:1.
d) C1 pulley matched with A2 pulley is a ratio of 6:1.
Hopefully, you can see where I am going. You should be able to mix and match and get a better ratio to spin your alternator faster. For example, measure the 2 crank pulleys you have. Select the larger of the 2. This will yield the highest inches of belt travel per engine revolution. Measure the 2 alternator pulleys and select the smaller one (sounds like the original one will do). This will give you the highest ratio of alternator rotation per crankshaft rotation (like example d). Using that combination, you will have the fastest turning alternator at that point. Cost, possible one drive belt (if it works out).
Hope this makes sense.
First, you now have 2 crank pulleys and 2 alternator pulleys, right?
Second, the important factor here is not the absolute diameter of each pulley, but the relative size in relation to each other. Let me give some examples:
a) C1 pulley is 6 in diameter, A1 pulley is 2 in diameter. This is a ratio of 3:1.
b) C2 pulley is 4 in diameter, A2 pulley is 1 in diameter. This is a ratio of 4:1.
c) C2 pulley matched with A1 pulley is a ratio of 2:1.
d) C1 pulley matched with A2 pulley is a ratio of 6:1.
Hopefully, you can see where I am going. You should be able to mix and match and get a better ratio to spin your alternator faster. For example, measure the 2 crank pulleys you have. Select the larger of the 2. This will yield the highest inches of belt travel per engine revolution. Measure the 2 alternator pulleys and select the smaller one (sounds like the original one will do). This will give you the highest ratio of alternator rotation per crankshaft rotation (like example d). Using that combination, you will have the fastest turning alternator at that point. Cost, possible one drive belt (if it works out).
Hope this makes sense.
