Guys:
About to fit the Barry fuel rail tuning kit and earthing kit. I'm taking up Barry's suggestion that now is a good time to change out all plugs and leads. I could go down the route of a new set of OEM plug leads. Or I could go Bosch. Or could even go the new NGK sets (about $135). What are you experiences with non OEM lead sets? And how much did your set cost you?

Can't you just check the existing ones with a multimeter? No point changing things that don't need changing!

been told topgun leadsa are good

If you go SCA They can order In the Top Gun ones and im sure there just as much or actually cheaper to get in then The Bosch ones.
There all 8mm arnt they?

go the factory ones

after market ones dont normaly fit right

I changed mine to bosh super sport inductive core 690 about 2 weeks ago. The magna seem to like them and had no issues but mind you replacing old leads for new ones will make the car feel better no matter the brand. These are black 10mm i think and do the job the same as top gun but cheaper, and there easyer to get a hold of:D

my 2c

When checking the leads wih a meter, what should the max resistance be?

Tools

How do I check/test leads??? (damn I feel like a n00b)

']If you go SCA They can order In the Top Gun ones and im sure there just as much or actually cheaper to get in then The Bosch ones.
There all 8mm arnt they?

yeh bro

autobarn has topgun in stock. supercheap has bosch in stock but can order pretty much anything haha.

bosch are all 8mm, well the ones that we stock are.

out of curiosity mate, are u an RTM or assitant manager?

When checking the leads wih a meter, what should the max resistance be?

Tools


aprox 7 ohms per foot

Surely you mean 6k-8k ohms per 300mm..?!!?!
And yes, aftermarket leads tend to fit pretty poorly most of the time, especially when the lead goes into a spark plug tube.

yea thats it

20k on the multimeter

aprox 7 ohms per foot

no. its more than that....
....

no. its more than that....
....

its aprox and if you get a new lead 1 foot long i bet its around 7k ohm 2 foot 14k ohm and so on

Surely you mean 6k-8k ohms per 300mm..?!!?!
And yes, aftermarket leads tend to fit pretty poorly most of the time, especially when the lead goes into a spark plug tube.

lol...300mm = 12" = Foot?

Hurricane leads are great if you can get your hands on a set!!

Hurricane leads are great if you can get your hands on a set!!

Do they blow the competition away?

']lol...300mm = 12" = Foot?


Ummm, yes.. and? The issue wasn't about the length, it was about the amount of resistance.
Big difference between 7 ohms and 7000 ohms.

Bosch, awesome warranty, keep your docket.

just wanted to bring up this thread again but new ones are supposed to be only 2k ohm per foot... anything more than 10k ohm per foot is considered toast.

a good example was the nology hotwires.. actually gave dyno impovements because of the built-in capacitor, but because of that would deteriorate in like a year went over 10k ohm in that time from 2.5k ohm


and this goes for all thicknesses of plug leads because the only thing that actually gets thicker is the insulation and not the core (unless you get multicores which are only really useful for upgraded igntion)

What plug leads do I use? ones that work! lol

Just measure the ohms and lengths of each lead. Work out the ohms per 300mm. The one with the highest resistance gets replaced. Simple, cheap, works for me. Cures a missfire every time. Some (most) of my leads, still working well, are 15 years old. I have been known to do the rounds of the wreckers with a multimeter . . . . .

7K ohm per foot (=300mm) is about right, but different makes vary. Just find the odd one out if you have a misfire under load. If its not the leads look at the plugs.

The factory ones (which I think are either NGK or Bosch).

the resistance is only a peice of the puzzle... a lead can have a good resistance, yey mis-fire due to its insulation breaking down, evident by white/grey powdery coating on the lead
my money is on the Bosch or NGK wire wound core, with preference to the NGK

how much of a difference does lead changing make? Would you recommend also upgrading the spark plugs?

if your leads are buggered or your running lpg then yeah big difference all round to go for wire wound
if i was doing the rear bank leads and the platies were due in say 20000km then id whack in some iridiums all round (and a phenolic gasket)