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Discussion Starter #1
Hi ppl does anybody know what's the gap of these plugs, cause I found that it's 1.1mm over the standard 0.8mm ones. Is it true??

And if these are fitted do I get better throttle response?

Malcolm :confused:
 

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I heard they are not any better than the standard ones that VX fit. That a lot of guys have had issues with their cars after fitting them.

I was going for a set today until I found that out!
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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When I started working in a Vx garage in '95, I was told the same thing - only use GM, Bosch or Delco plugs in a GM engine. Others such as NGK or Champion will cause problems. Not sure exactly why, but I have stuck to the advice and never had any problems.

Grasso - why do you NEED to change to some better plugs? If you must, why not just change the standard ones more often?
 

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Discussion Starter #5
Because I've heard that they have better electrode thus better spark therefore it will result in better performance and better fuel consumption.
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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Because I've heard that they have better electrode thus better spark therefore it will result in better performance and better fuel consumption.
More half-truths propogated by people who obviously make a big profit on these premium parts.

I very much doubt you would measure any difference in power output between iridium and standard plugs, and any change in throttle response would be purely subjective, and more likely due to the placebo effect (I've fitted expensive plugs that tell me the throttle response is better, so it must have improved!)

The only benefit from iridium plugs is longer life, due to the iridium being a lot harder than standard plug electrodes, which means it does not erode away as fast. The plugs will give you better fuel consumption and performance, but only after the mileage at which the standard plugs would have worn to the point of causing a drop in engine efficiency.
 

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LADmachining is absolutely right. Don't bother. Use the standard plugs. You won't see any improvement with the others. I understand not using GM plugs can cause problems as the ECU expects a particular interference suppresion resistance in the plug which the replacements don't always match.

JS
 

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A.O.N - Approved Vauxhall Specialist (Anthony)
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<SNIP> I understand not using GM plugs can cause problems as the ECU expects a particular interference suppresion resistance in the plug which the replacements don't always match.

JS
Thanks for that John - I hadn't thought of the plugs causing a problem in that way before. Would certainly seem to fit with the symptoms people describe after fitting non-gen plugs... (Y)
 

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Only issues I have heard from fitment of Non GM plugs was down to installation errors.

Either being overtightened or not tightened enough , I have been running NGK iridiums in my VXR for over a year and no issues
 
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