Club G40 Forum

Technical => Electrical => Topic started by: GTG40 on July 19, 2009, 05:27:00 pm

Title: 55amp Alternator
Post by: GTG40 on July 19, 2009, 05:27:00 pm

If i was to put a standard (i think its 55amp) alternator on a g40 would it run properly? or does it need a minium of 65amps

thanks
steven

Title: Re: 55amp Alternator
Post by: Dan on July 19, 2009, 05:51:13 pm

I'm pretty sure you would be fine with a 55A alternator. GT's have them and seem fine. 65A would be ideal if you have plenty of interior electrics.

Title: Re: 55amp Alternator
Post by: PeteG40 on July 19, 2009, 06:00:27 pm

yoof/hayes i think rock a 55amp on their turbos.

Title: Re: 55amp Alternator
Post by: GTG40 on July 19, 2009, 08:38:13 pm

ok cheers
cos i've have a 55amp alt on my G turbo, not managed to get it running properly yet, trying to sus out what up with it. altanator must be ok then if they're running a 55amp. altho my voltage is a bit low.

The problem is it will idle when cold for about 5 mins then it will cut out and won't idle, then i'll start it again then it will idle for about a minute and cut out. sometimes when its warmed up it will idle but its very lumpy, most of the time it just cuts out.

Also if i hold it at a constant 2000rpm the revs will dip every 4-5 seconds to about 1500rpm or lower then back to 2000rpm.

And it seems to be running a bit rich, can smell unburnt fuel.

I've put in 250cc injectors, psd turbo cam and a turbo chip off PPP to suit.

I've noticed if i unplug the blue temp sensor then it will idle fine so i changed the sensor but it made no difference

can any one help

thanks
steven

Title: Re: 55amp Alternator
Post by: Dan on July 19, 2009, 09:17:00 pm

Sounds like you have answered the problem, if the voltage is low it will cause those sort of running probs.

Title: Re: 55amp Alternator
Post by: GTG40 on July 19, 2009, 09:35:44 pm

Quote from: Dan on July 19, 2009, 09:17:00 pm

Sounds like you have answered the problem, if the voltage is low it will cause those sort of running probs.

I'll try a different alt an see what happens. funny how it ticks over ok with the temp sensor unplugged

Title: Re: 55amp Alternator
Post by: hayesey on July 19, 2009, 10:10:56 pm

yes you need to see a good 13v across the battery terminals with a multimeter with all the electrical things turned on or the ecu will get the hump.

Title: Re: 55amp Alternator
Post by: GTG40 on July 26, 2009, 11:04:56 pm

Quote from: hayesey on July 19, 2009, 10:10:56 pm

yes you need to see a good 13v across the battery terminals with a multimeter with all the electrical things turned on or the ecu will get the hump.

getting a proper voltage from the alternator now an does cut out  ;D

managed to stip down the alternator and found 2 wires were broke from the coil to the circuit board soldiered them up and jobs a good'un