[80sMetalDude]

Couple things. Since finalizing the Whipple install I have been battling a slow weak turnover, engine starts fine.

Charged battery: 100%

Cranks "ok" drive to work get home and battery reads 67%.


So either my battery is kaput or the alternator is....

I cant think of anything related to the SC install that would impact the alternator any.

If I get a battery should I get one with more juice?

Any recommendations?

[Omega]

Originally Posted by 80sMetalDude

Couple things. Since finalizing the Whipple install I have been battling a slow weak turnover, engine starts fine.

Charged battery: 100%

Cranks "ok" drive to work get home and battery reads 67%.


So either my battery is kaput or the alternator is....

I cant think of anything related to the SC install that would impact the alternator any.

If I get a battery should I get one with more juice?

Any recommendations?

Check to see if the Exciter plug is in properly on the alternator. Not the big power wire to the battery, there is a single wire connector at the 2 o'clock position I think.


Sent from my Pixel XL using Tapatalk

[80sMetalDude]

Originally Posted by Omega

Check to see if the Exciter plug is in properly on the alternator. Not the big power wire to the battery, there is a single wire connector at the 2 o'clock position I think.


Sent from my Pixel XL using Tapatalk

Thx for the tip I will try and find out what that is you are referencing... appreciate it

[brettman]

Look at your dash gauge, is it charging?(n) (y)> Battery connection clean, tight? (y)> Battery bad
Alt, wiring, connection

[80sMetalDude]

Originally Posted by brettman

Look at your dash gauge, is it charging?(n) (y)> Battery connection clean, tight? (y)> Battery bad
Alt, wiring, connection

Going to pay closer attention I didnt even realize it gave an indicator for charging. 80sMetalNOOB damnit. OK so I do know when it was solid it was showing around 14v almost all the time and now it barely shows 12v def. low.

Will do more looking at this before I ask any more dumba$$ questions.

[Ian SS]

Is the slow crank when warmed up/hot or all the time?

M6 cars have had issues with heatsoaked starters.

[Eyefixstuff]

Originally Posted by Ian SS

Is the slow crank when warmed up/hot or all the time?

M6 cars have had issues with heatsoaked starters.

Mine seems to have this problem. I was going to try to figure out a remedy his weekend.

[Eric SS]

How much slower is it? Superchargers themselves can cause a little slower crank just because of the drag. if it started fine right before you put it on and then the next time you tried starting it after the install it cranked a bit slower it might just be that.

[Ryephile]

Originally Posted by 80sMetalDude

Going to pay closer attention I didnt even realize it gave an indicator for charging. 80sMetalNOOB damnit. OK so I do know when it was solid it was showing around 14v almost all the time and now it barely shows 12v def. low.

Will do more looking at this before I ask any more dumba$$ questions.

Just FYI, the charging system toggles between charging and not charging, and as such the voltage will swing from 12-ish to 14-ish volts. The intent is two-fold; to reduce parasitic drag on the engine, and extend the battery life by lightly cycling it more often.

Also keep in mind you just added a bunch of drag to the engine with the supercharger. I'd compare the part numbers of the SS and ZL1 starters to see if they're the same, and then compare your cranking with a ZL1 to see if it seems similar. There also might be (likely are) cranking tune differences between the LT1 and LT4 engines.

So, a few things to keep in mind.

[brettman]

Originally Posted by 80sMetalDude

Going to pay closer attention I didnt even realize it gave an indicator for charging. 80sMetalNOOB damnit. OK so I do know when it was solid it was showing around 14v almost all the time and now it barely shows 12v def. low.

Will do more looking at this before I ask any more dumba$$ questions.

The only dumba$$ question is the one NOT ASKED

To the other posts. I don't know if it's the manual trans (I have A8) But since the SC install I haven't noticed ANY change Hot or Cold at start-up.

[80sMetalDude]

Thx for all the responses.

I was wondering too about the extra drag. I dont mind chucking a little $$$ at the problem if more CCA (learned that from Brett today ) at the issue.

That's an interesting thought about the ZL1 and SS prob having diff starters. Looks like Camaro all the way through Caddy CTSV use same starter part #.

And "heatsoaked" (would climate effect that) because it's been MEGA hot here in Detroit area last week and that's about all I have it running (1 week.)

[Ryephile]

Ok, same starters. Sounds like you need to do a cranking comparison with a ZL1. I'd also contact a tuner to have them see if there are different ZL1 cranking parameters. I haven't checked so that's just a theory, but it's likely there are differences.

Just for sanity, make sure your bypass valve is operating correctly. If it's closed during cranking, it'll add more parasitic drag.

[Ian SS]

Originally Posted by 80sMetalDude

Thx for all the responses.

I was wondering too about the extra drag. I dont mind chucking a little $$$ at the problem if more CCA (learned that from Brett today ) at the issue.

That's an interesting thought about the ZL1 and SS prob having diff starters. Looks like Camaro all the way through Caddy CTSV use same starter part #.

And "heatsoaked" (would climate effect that) because it's been MEGA hot here in Detroit area last week and that's about all I have it running (1 week.)

Yes outside temp would effect it.

My car usually only slow cranks like that after a few laps of autox. If I turn it off after a lap It struggles to start again, just cranks realllllllly slow.

It never did it outside of track racing but one day it was about 90 outside and I was idling in a hot parking lot and it slow cranked after trying to start it again.

[Joe's_cool_1le]

Not sure if you remember Lethal and the ProCharger issue thread.... I finally asked him what was the cause of his extremely slow crank (even though he said it went away I thought after cutting the SC belt. He received the Procharger back and they found no issues, the tensioner was also not an issue per CMS, so he said the final result was "guessing it was the starter". I believe I'm getting that quote right.