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Author Topic: Mk5 gti plugs.  (Read 2557 times)

Offline imprezzaworks

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Mk5 gti plugs.
« on: July 06, 2022, 07:03:33 pm »
Looking at replacing these as unsure when they were last done. Standard car.

Cheers chaps.
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Offline Clarky

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Re: Mk5 gti plugs.
« Reply #1 on: July 06, 2022, 07:09:22 pm »
No idea why it will only copy like this....courtesy of @ROH ECHT                                                                   Offline ROH ECHT
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Re: Dyno Day Disappointment
« Reply #14 on: June 18, 2022, 02:46:21 am »
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NGK BKR7EIX are a 5k Ohm restricted plug. You really should consider going back to the 1k Ohm plug (NGK 1675 PFR7S8EG) w/gaps at 0.8 mm, and allow more voltage to pass through the plug when stock as yours is. At stock there's no need to restrict the power for the arc it can generate. Because your combustion situation is not likely to disturb its arc.
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Offline imprezzaworks

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Re: Mk5 gti plugs.
« Reply #2 on: July 06, 2022, 07:13:51 pm »
Huh?
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Offline Clarky

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Re: Mk5 gti plugs.
« Reply #3 on: July 06, 2022, 07:18:22 pm »
So I would hazard a guess that @ROH ECHT knows his stuff from what I have seen on here!...for a standard car as per yours he recommended the NGK 1675PFR7S8EG plugs....that was what I was after
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Offline imprezzaworks

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Re: Mk5 gti plugs.
« Reply #4 on: July 06, 2022, 07:24:02 pm »
Thanks mate
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Offline Clarky

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Re: Mk5 gti plugs.
« Reply #5 on: July 06, 2022, 08:07:37 pm »
You are very welcome! I take no credit at all though...
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Offline pudding

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Re: Mk5 gti plugs.
« Reply #6 on: July 07, 2022, 01:22:58 pm »
Yeah the PFR7S8EG is the OEM plug.

They are the same price as the standard issue BKR7EIX so take your pick.  I didn't notice any difference between the two  :smiley:
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Offline imprezzaworks

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Re: Mk5 gti plugs.
« Reply #7 on: July 07, 2022, 02:12:48 pm »
Will grab the ngk ones :)
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Offline ROH ECHT

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Re: Mk5 gti plugs.
« Reply #8 on: July 07, 2022, 10:57:25 pm »
The difference is; BKR7EIX is 'Iridium' and a 5k Ohm plug.
The PFR7S8EG is; 'Platinum' and a 1k Ohm plug.

NGK says; their Platinum lasts 90k miles and the Iridium lasts 50k miles.
A 1k Ohm plug will restrict less voltage coming from the OE coils.
With the 5k ohm plugs; you may need to reduce the gap from 0.8mm, so the arc can span the gap of the electrodes. Probably not until tuned though.

The point is to run a plug and coil pairing to produce an arc to span the greatest gap without being disturbed by all that boost, fuel and heat and stuff.  :happy2:
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Offline mjmallia

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Re: Mk5 gti plugs.
« Reply #9 on: July 08, 2022, 08:05:15 am »
The tips on the BKR7EIX are smaller at 0.6mm compared to 1.0mm on the other also.......to compensate for the higher resistance I guess.
« Last Edit: July 08, 2022, 08:09:31 am by mjmallia »
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Mike

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Offline pudding

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Re: Mk5 gti plugs.
« Reply #10 on: July 08, 2022, 08:47:24 am »
Iridium is more conductive than platinum, but resistance differences make little to no difference at the plug tip at the end of the day.  The resistor is only there to stop electrical interference messing with the DBW throttle tracking.  1 or 5Kohms makes little to no difference in terms of spark strength as that is governed by the dwell time of the coilpack, which the ECU varies according to load and battery voltage anyway.


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Offline mjmallia

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Re: Mk5 gti plugs.
« Reply #11 on: July 08, 2022, 11:00:48 am »
Been using PFR7S8EG since I got the car, hoping some BKR7EIX on a stage1 will work fine.
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Mike

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Offline pudding

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Re: Mk5 gti plugs.
« Reply #12 on: July 08, 2022, 12:29:22 pm »
Standard plugs are fine on Stage 1 - 2+.   There seems to be a misunderstanding that the BKR7EIX is an upgrade.  It's exactly the same spec as standard, just a different electrode material.

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Offline mjmallia

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Re: Mk5 gti plugs.
« Reply #13 on: July 08, 2022, 01:15:25 pm »
Yes get that impression a lot.  Looking on the NGK site there also appears to be another Iridium plug offered: IFR7X8G that has a similar spec to the BKR7EIX

https://www.ngkpartfinder.co.uk/catalogues/cars/search/spark-plugs/VOLKSWAGEN/GOLF/2005/14571/



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Mike

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Offline pudding

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Re: Mk5 gti plugs.
« Reply #14 on: July 08, 2022, 01:58:34 pm »
Interesting, haven't seen that one before.  NGK consider it an upgrade (over the PFR7S8EG)......probably because it's Iridium. Not cheap at £16 each though  :grin:

It has a platinum pad on the ground strap, which makes it an upgrade over the BKR7EIX  :happy2:   The BKR7EIX just has a plain ground strap, so won't last as long as the IFR7X8G.

To be honest, there's no way I would leave a plug in for 50K+ miles anyway.  I normally do them every 20K miles just to keep the spark as healthy as it can be.
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