To earth or not to earth...that is the question...

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Delivan
Impreza 22B Driver
Posts: 1817
Joined: Tue Apr 29, 2008 12:18 am
Location: Sitting in the kitchen in Brisbane

To earth or not to earth...that is the question...

Postby Delivan » Tue Jun 20, 2017 11:16 pm

Some say alloy radiators should be earthed while others say they shouldn't.. My sons sti has gone through 2 radiators in 3 years and when he took it in for a warranty replacement they panel beater sent it off to a radiator shop to sus it out. They tested the radiator and found it had 128ohms so they earthed it to the engine and to the chassis and brought it down to .3 of an ohm.... the sti is a version 6 with a forged 2.5 06 forrester engine with the sti heads...
We have 3 other wrxs all with alloy radiators... 2 bugs and a gc8...gc8 also has late model 2.5 engine.....should I earth them all ??????
'09 Impreza Charcoal Hatch Auto
'03 WRX Pearl Red Bug Sedan
'02 WRX Silver Bug Wagon
'98 WRX Blue Club Spec Evo 2 with 2.5 lt
'99 WRX White Sti Version 6 with 2.5 lt
'98 Mitsubishi EVO 5 (kept in the basement)

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: To earth or not to earth...that is the question...

Postby mv75 » Wed Jun 21, 2017 3:30 pm

Check the engine earth first. The car is earthing through the coolant.

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Delivan
Impreza 22B Driver
Posts: 1817
Joined: Tue Apr 29, 2008 12:18 am
Location: Sitting in the kitchen in Brisbane

Re: To earth or not to earth...that is the question...

Postby Delivan » Wed Jun 21, 2017 4:27 pm

Hhhmmm ok.. Only old coolant should carry a charge. Russel recons not to earth.. I will conduct some tests on the others..
'09 Impreza Charcoal Hatch Auto
'03 WRX Pearl Red Bug Sedan
'02 WRX Silver Bug Wagon
'98 WRX Blue Club Spec Evo 2 with 2.5 lt
'99 WRX White Sti Version 6 with 2.5 lt
'98 Mitsubishi EVO 5 (kept in the basement)

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: To earth or not to earth...that is the question...

Postby mv75 » Wed Jun 21, 2017 4:41 pm

Just look at the neg leads from the starter/rear block trans bracket to battery and battery to the fender. Check their condition, I replaced mine sorta recently, and the positive as well because they were all scummy and white powdery on the ends, just total sheet really. I also ran an extra ~4ga run from the neg starter tab to the fender directly, and another from the battery neg to the shock tower. With the positive I also ran a new charge length from the fuse box to the battery. 8ga was a direct replacement there.

James05351
Learner Driver
Posts: 7
Joined: Sun May 07, 2017 4:49 am
Location: Melbourne

Re: To earth or not to earth...that is the question...

Postby James05351 » Sat Jun 24, 2017 8:38 pm

I was getting these fault codes yesterday (shown in pic), so after some digging and many threads I started with the simplest solution which was to clean the battery contacts (+ and -) expose any areas where contact was made through paint and replace a few neg cables with 8 GA cable, also have the maf a decent clean, checked hoses, etc.

long story short it cured my fault codes, hasn't thrown anything at startup which is when they were occuring.

ALSO dash is noticibly brighter and she fires quicker at start up, plus it's cured my random idol hunting issue and low rev stutters. now I did a couple things but doing the new earths for cost and effort is totally worth it I think.Image

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: To earth or not to earth...that is the question...

Postby mv75 » Tue Jun 27, 2017 4:33 am

Get anywhere Delivan?

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Delivan
Impreza 22B Driver
Posts: 1817
Joined: Tue Apr 29, 2008 12:18 am
Location: Sitting in the kitchen in Brisbane

Re: To earth or not to earth...that is the question...

Postby Delivan » Tue Jun 27, 2017 1:26 pm

I checked my wife's and my blue one and they are both 0.00 Volts , I still need to check one of my daughters rexs and the sti has been fitted with earth straps to fix the problem.. These are the instructions that came with the new radiator (full alloy)..

Image
'09 Impreza Charcoal Hatch Auto
'03 WRX Pearl Red Bug Sedan
'02 WRX Silver Bug Wagon
'98 WRX Blue Club Spec Evo 2 with 2.5 lt
'99 WRX White Sti Version 6 with 2.5 lt
'98 Mitsubishi EVO 5 (kept in the basement)

mv75
WRX STi Driver
Posts: 857
Joined: Sat Dec 27, 2014 9:26 pm
Location: Brisbane Northside.

Re: To earth or not to earth...that is the question...

Postby mv75 » Tue Jun 27, 2017 5:12 pm

Sounds like the sti still has problems. Check the earths at all? Shouldn't have to strap the rad.

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Delivan
Impreza 22B Driver
Posts: 1817
Joined: Tue Apr 29, 2008 12:18 am
Location: Sitting in the kitchen in Brisbane

Re: To earth or not to earth...that is the question...

Postby Delivan » Tue Jun 27, 2017 9:17 pm

I can't check it...My son has taken it down to Thredbo for the winter snow season...But the radiator specialist who fitted the new one said it would fix the problem that had destroyed the old one in less than 2 years..

Image
'09 Impreza Charcoal Hatch Auto
'03 WRX Pearl Red Bug Sedan
'02 WRX Silver Bug Wagon
'98 WRX Blue Club Spec Evo 2 with 2.5 lt
'99 WRX White Sti Version 6 with 2.5 lt
'98 Mitsubishi EVO 5 (kept in the basement)

ryano
Impreza WRX Driver
Posts: 271
Joined: Thu Aug 19, 2010 9:12 pm

Re: To earth or not to earth...that is the question...

Postby ryano » Wed Jun 28, 2017 3:58 am

i think if you earth the rad you will end up with electrolysis

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