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Car running way rich after alternator upgrade
Posted: Fri Aug 21, 2015 4:07 pm
by bcmaxx
Upgraded my tired old alternator, max output was 11.8 volts.. installed an 06 impreza alternator, output 14.18 volts now my car is running way rich especially on boost?? weird??
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 4:10 pm
by cj91legss
That means you should just add more boost.
JK... or am i?
Seriously tho, the alternator actually has a lot to do with the electrical system. How much power it puts out is critical. Your old alternator was tired for sure....
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 5:13 pm
by smagg26
DID THAT JUST BOLT ON? I'VE BEEN LOOKING TO UPGRADE MINE, WOULD LIKE SOMETHING THAT HAS A HIGHER OUTPUT THAN 13.4
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 5:16 pm
by bcmaxx
smagg26 wrote:DID THAT JUST BOLT ON? I'VE BEEN LOOKING TO UPGRADE MINE, WOULD LIKE SOMETHING THAT HAS A HIGHER OUTPUT THAN 13.4
more boost is in order lol, im only testing at 8psi, new shortblock just breaking in!
and the alternator was a bolt in yes, but... I needed the newer pigtail off the newer car, and you have to delete one wire old leggy 3 wire, newer alternator was 2 wire
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 5:24 pm
by smagg26
COOL. WHICH WIRE WAS IT IF YOU DON'T MINE ME ASKING? OR IS IT JUST COLOR MATCHING?
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 8:34 pm
by bcmaxx
smagg26 wrote:COOL. WHICH WIRE WAS IT IF YOU DON'T MINE ME ASKING? OR IS IT JUST COLOR MATCHING?
I deleted the yellow wire with no ill affect.
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 8:49 pm
by smagg26
OK THANK YOU FOR THE INFO
NEED TO GET ME A 110 AMP TO COMPENSATE FOR THE OVER DRIVE PULLEY
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 9:22 pm
by robertpaige
So all you did was just clip the yellow wire out? Damn!
Re: Car running way rich after alternator upgrade
Posted: Sat Aug 22, 2015 10:31 pm
by bcmaxx
robertpaige wrote:So all you did was just clip the yellow wire out? Damn!
thats it!
Re: Car running way rich after alternator upgrade
Posted: Sat Sep 12, 2015 3:50 am
by Legacy777
The difference between the old and newer style alternators is the third wire is a turn on lead. The newer alternators turn on automatically once they get above a few rpms. Make sure to tape up that third wire because it will have 12v going to it.
Regarding your running rich, I would recommend resetting your ECU. The ECU has a table that adjusts injector pulse based on voltage. If you had consistently run with lower voltage the fuel learn trims probably added more fuel to bring it back into the region it should be. Now that you have higher voltage your fuel trims are off. Resetting the ECU will get rid of those fuel trims.