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2002 Monte Carlo Blue CVT
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Discussion Starter #1
A fellow ICer recently did a stick level IMA pack rehab for me on a "dead" Primearth pack with unknown history I picked up for $50.

Sticks were cycled on a hobby charger with a five cycle - charge/discharge pattern. I could get more details for the truly curious.

Sticks were self-discharged to about 4. something volts each from prolonged pack inactivity.

They were charged over several days, four sticks at a time. Not sure of charging current or duration.

Pack went back in the car today. On its maiden voyage, I have to say it is completely transformed. SOC at or near one bar from the top (with some dips by c. 3-4 bars, with eventual bounce back to near top.

Assisting and charging as designed. No lights/codes. Autostop functioning. Mpg (with snow tires) up to 60.3 from high 40s, low 50s when previously running ICE-only.

Too early to comment on long term prospects, but preliminary indications are promising.
 

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"Yes", the truly curious reply. More details please.

From the posts I gathered on IC, I guess a Hitec X2 hobby charger was used?

Hmm 4 sticks at a time. So for 20 sticks, it would be repeated 5 times. Let's say it took 5 days.

Hmm if you invest in a Hitec X2 hobby charger, and I invest in one too ... and, just for now, 3 of us share them ... it could shorten the process from 5 days to less than 2. Just a thought.
 

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2002 Monte Carlo Blue CVT
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Discussion Starter #3
I'll check with my source and see if I can get more precise details to post.
 

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Discussion Starter #4 (Edited)
Hitech XC4 AC Pro Charger to be exact.

I'll try to get cycle times and all the technical details as far as amps/volts, etc.

What I can say is the individual sticks were in what I would consider to be a high state of self-discharge from prolonged non-use, but I am a rank neophyte with this car and can't tell amps from ohms, so I would consider the source when reading. What I know about electricity would fill a thimble.
 

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2002 honda insight, 1980 corolla 4g63 swapped, 2003 volvo xc70 the daily
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Charge was set @5.0 amps.Discharge was @ 2.0 amps. With a cool down period of 30 minutes In-between cycles. Cannot tell time in each cycle. Can only tell end of charge mah and voltage.
 

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Charge was set @5.0 amps.Discharge was @ 2.0 amps...Cannot tell time in each cycle. Can only tell end of charge mah and voltage.
"charge mah" / 5A X 1000 = charge time in hours, ex. 5200mAh / 5000mA = 1.04 hours. Same applies to discharge, just change the rate to 2A, or 2000mA.
 

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2002 Monte Carlo Blue CVT
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Discussion Starter #9 (Edited)
Short term results seem promising. I'll give it more of a workout this weekend with some longer local trips. So far only local errands at about 12 mile round-trips up and down Schooley's Mountain Rd. The uphill trip will take the battery down 3-5 bars from it's starting position one from the top, but the downhill with some light regen braking brings it right back up. So far getting assist and recharge only when I would expect them, i.e. no charging while I'm cruising at moderate speeds on level roads.

Still awaiting cooling system parts ordered from Majestic on 9/1, which are scheduled to arrive in today's mail, so ten days from order to receipt with an intervening holiday with economy shipping option.

In the Northeast, I'd figure about a week plus for G1 parts ordered there. Some of my items were not in inventory and had to be ordered.

 

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2001 5S "Turbo"
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Are you using a OBDIIC&C gauge to monitor the IMA battery. That is the only way you can observe the "Background Charge" that is common on the G1 while cruising..
 

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^ You can downshift, get RPM above about 3k, go light throttle, and if there's a background charge the green bars will show up. On the other hand, if you have a CVT not sure what you'd do. Maybe shifting to low would have a similar effect...
 

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2002 Monte Carlo Blue CVT
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Discussion Starter #13
CVT -- no extra pedal. Alas, left knee can't handle the extra pedal.
 

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Discussion Starter #14
Still looking pretty good. Only about 160 miles or so since the stick level cycling, but MPG up to 54.7 on local only jaunts -- and seemingly continuing to rise. SOC indicator will drop by 4 or 5 bars during usage, but always back up to one bar from full when I return to my driveway.

I'm driving for mileage, and a bit like a granny -- I haven't stomped on it yet and I haven't tried to burn rubber up hill either, but I'm pretty pleased so far, especially given that I am running snow tires at 36 psi.
 

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Packs have the best chance to go wacky when you accelerate hard in fifth for a while. If it is going to throw a light, it will do it then. No harm in trying it. You can always pull over and do a 12V reset to get it back ;)
 

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2001 5S "Turbo"
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AT least jack your tire pressures back to around 40-45, or the max pressure listed on the tires..
 

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Still looking pretty good. Only about 160 miles or so since the stick level cycling, but MPG up to 54.7 on local only jaunts -- and seemingly continuing to rise. SOC indicator will drop by 4 or 5 bars during usage, but always back up to one bar from full when I return to my driveway.
These 'metrics' have little to nothing to do with the quality of your rehab program... You might as well be saying, 'My paint now has a mirror-like shine, and valve noise has gone away.' OK, so a bit hyperbolic, but not by much.

How about trying something closer to a real test?: Floor it, do the ASST bars pull back? It'd be better if you had an OBDIIC&C so you could read some real values... Try holding assist up a long hill until neg recal: How long did it take, where was the bar gauge at empty?
 

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2002 Monte Carlo Blue CVT
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Discussion Starter #19
Not sure I want to drain the battery just to prove to myself I can drain the battery. I know I'm living on borrowed time at this point. I'm just going to ride that pony as far as I can.
 

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It won't hurt it to try one aggressive acceleration run. If the IMA light comes on, then simply reset with the 12V ground removed. You'll know more about the battery. I guess the most important test would be the position of the SOC gauge when the gauge does a negative recalibration - as eq1 suggested. That will give you a pretty good idea of your level of success:)
 
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