vbat vs rpm

Post Reply
Andy.F
Posts: 3
Joined: Sat Apr 14, 2012 10:55 am

vbat vs rpm

Post by Andy.F » Fri Oct 12, 2018 8:13 pm

Has anyone seen anything like this before? vbat dropping with rpm increase.

Belt is tight, nothing is sequenced to come in at rpm/load such as fuel pumps etc

vbat drops into the 10's.

Boost, IDC, WG, AFR, TPS are all moving less than 5% during wot 6000-8800rpm so no drastic load changes on pumps/coils etc

Vbat 2.png
Vbat 2.png (73.68 KiB) Viewed 970 times

stevieturbo
Posts: 834
Joined: Sun Dec 07, 2008 2:04 pm

Re: vbat vs rpm

Post by stevieturbo » Sat Oct 13, 2018 5:11 pm

Cant see your scaling to see how bad the variation is, but did see some odd behaviour not too long ago when main wire on alternator was not tight.

Also affected fuel pressure.

Andy.F
Posts: 3
Joined: Sat Apr 14, 2012 10:55 am

Re: vbat vs rpm

Post by Andy.F » Sun Oct 14, 2018 8:22 pm

Cursor is on the Vbatmax (see sidebar) and pop up is on the Vbatmin to show the variation. 10.9 - 13.9v

All connectors have been checked, just wondering if anyone has seen this perhaps as a result of a failing alternator or battery?

Post Reply