Spark Plugs??

[Adey]

ok whats the general on spark plugs for extra boost? i want a set for the LeCar but the expected power output will be double standard, what should i go for?

 

[DaveL485]

NGK Platinums, or NGK Iridium Resistor plugs for standalone. Avoid twin spark or super four style plugs on forced induction cars.

Use this...(have attached pdf file as well as the image). For example I recommend BP7EFVX for the 21, and now i'm using TR7IX with the Adaptronic.

 

[Adey]

ok so do i need hotter or colder plugs than standard?

 

[DaveL485]

I always stick to the same heat rating mate, which in the case of a 21, is 7. Never needed to go colder as yet.

 

[gangles1987]

which plugs do you use in your 21 dave ?

 

[DaveL485]

NGK BP7EFVX, gapped to 0.55mm is the best I have found for the 21 on an OE ECU setup mate.

 

[gangles1987]

there pricey old plugs they are lol i thought i got the number wrong but obviously not :/ ..........

 

[DaveL485]

there pricey old plugs they are lol i thought i got the number wrong but obviously not :/ ..........

£30 a set? Thats cheap! The competition plugs I was considering the other day were a hundred quid....EACH PLUG

 

[gangles1987]

that would make me cry lol £100 a plug ! i didnt pay much more for my whole car lol
i will get some though and maybe few other little ignition bits my car doesnt seem to be 100% running right

 

[jamesc]

I used this NGK plug finder site and it came up with B8EFS with 0.6 mm gap for standard Gordini turbos.

http://www.ngkpartfinder.co.uk/car_commercial_extra.php?id=7385

That plug code is also listed in the below info about modding the 5 turbo up to about 210 hp so I will be trying that one first on Bougie.

http://renaultalpineownersclub.com/membersarea/Renault 5 Turbo 1 and 2 Tuning.pdf

On my Volvos I used to go a grade or 2 colder plus smaller gap where I had upped the boost. For example my S70 went from 10.5 psi to around 17 so I dropped from the standard 0.8 gap to 0.6 mm.

Here is the bumpf I found on it, not saying this is gospel but worked for me (on a totally different car ):

http://www.boschsparkplugs.net/lear...i-have-slightly-modified-my-motor---do-i-need

http://www.mkivsupra.net/vbb/showthread.php?35931-Misfire-under-boost-(plus-misfire-diagnosis

edit: this cross-reference chart helped me, I didn't know an NGK 8 wasn't the same as a Bosch 8 until recently!