Spark plugs for 400hp

[Fiddy]

Hi everyone

I’m wanting to change my spark plugs. What would you guys go for?

My car is just under a bar, standard ignition and around 400hp

Thanks matt

 

[jdmr_neil]

The bur9s are still fine for that power. I use r7420-10s but only because of the WI.

 

[cib24]

What is the reason for using a colder plug with water?

 

[jdmr_neil]

Recommended by my tuner mate, believe is because of the colder intake air on boost.

 

[rob fd]

I also use 10s with 50/50 meth/water and 17psi boost.

 

[Fiddy]

Are they the ones that are £20 each

 

[cib24]

Huh, I always thought colder plugs were for cars pushing 500+hp and effectively big boost, i.e. 22 PSI or higher.

 

[jdmr_neil]

Are they the ones that are £20 each

£100+ for 4

 

[rob fd]

Are they the ones that are £20 each

Bur9s will do the job mate.

 

[rob fd]

Huh, I always thought colder plugs were for cars pushing 500+hp and effectively big boost, i.e. 22 PSI or higher.

I'm just going off pips suggestion. He wanted colder plugs to map it at my boost level on a 8374 with WI.

 

[jack.am]

Colder plugs with AI doesn't make sense to me, surely your combustion temps are lower so you'd go for a warmer plug? I guess the AI would stop them fouling up.

 

[Mpls24]

Can do 9's in the front and 10's in the rear too.

Anyone on 10's have problems with lazy starting?

 

[davyv]

I use 10 + 10.5.Thats what pip put in.
480bhp with WI @1 bar

 

[Calum122]

Just out of interest...how many plugs do these engines take?

 

[Sturneyrx7]

Just out of interest...how many plugs do these engines take?

4

 

[Calum122]

4

So it's two cylinders, and they run two spark plugs in each of the combustion chambers?

 

[Myocardial Infarction]

So it's two cylinders, and they run two spark plugs in each of the combustion chambers?

Yes 1 leading and 1 trailing

 

[Calum122]

.