when i get into heavy boost, hp tuners says i an at 11ish volts. is this just the alt not being able to keep up with all the extra accecories? it started doin it after i added the new holley dominator pump, website says it draws up to 36 amps. thought that was alot.

not sure where to start. its got a new alt and new batt on it. at idle i can see the voltage drop slightly once in awhile, and the car will start to chug.

 

my car does this with out boost im thinking it is a ground issue but could wrong .

 

Which alternator? 105 or 145 amp?

 

I had the same problem and swaped in a truck altenator 145 amp which helped the voltage but not the spark blow out . I had to bring my gap down to .20 to stop the spark blowout.

What are your plugs gapped at?

 

It's whatever the stock spec alternator is. It's new but a stock replacement.

What can I pit on that will bolt up but more amps??

 

Gap is .022" 25psi, it didn't blow out spark atall on the dyno

 

https://ls1tech.com/forums/generatio...-failures.html

 

I had an alternator I bought off ebay that stopped charging above 6000rpm.

No idea why it was doing it. Put the original one back on and it was fine.

 

anyone ever have problems with the belt slipping, i just did a quick homeade manual tensioner by flipping around the stock one, havent tried it yet, but wondering if thts what is causing it.

 

possible, but unlikely.

 

i know the alt seems pretty hard to turn, and i was reving the car at idle, and noticed that even at idle if i rev it slowly it wont break up, if i stab the throttle, it does. and when it breaks up goin down the road, it doesnt do it untill the rpms climb real fast from the boost

 

Sounds like a electrical connection issue. Check the back of the alternator where the power terminal is and make sure its tight. Also check the 1 wire connection from the PCM.

 

Had the same issue with 4 different "rebuilt" alternators. Bought a junkyard 145 amp for 45$ and it's fixed lol

 

well my manua tensioner works well, but it still mis fires. voltage isnt dropping. im not sure which way to turn, gonna pull all the plugs and see whats up, gotta double check all the wires too.

 

What coils, plugs, plug gaps ? What AFR's before it occurs ? How much boost you talking ?

 

fbody coils, br7ef's,.022",11.4-11.6:1,25.5psi

but it does it before it even gets to 20#s i am goin ot pull th eplugs and re crimp the wires, they never seem to snap on right

 

I used to have really bad misfire issues last year. I tried everything, plug gaps, valve springs, wires, alternators, dwell timing, coils etc. I did some testing on the dyno and noticed my coils we're getting very hot. I swapped to a set of my buddies ls2 coils and my car instantly gained a lot of power. I eventually bought the d585 truck coils and ran my dwell timing up to 5 m/sec. This fixed a lot of my issues but not all of them. I was also having issues with my msd wires not always snapping on correctly. I bought a set of firecore wires and all my issues are a thing of the past.

 

they make a plug and play voltage regulator mighty mouse was using and it fixed the prob

 

voltage regulator for the coils? or alt?

 

and i pulled the pulgs, they look perfect, re crimped the wires like i said, tightened em up to .020" and put it all back together, but its raining here so cant try it out, i doubt thtd fix it tho.