Just installed COPs to my preboosted 1.6L. the difference is Amazing! After the test drive I began to wonder the same thing someone else posted on but never got answered here. Has anyone dyno'd before and after? I know you cant sit in a car and feel a certain hp gain but I know for a fact that thing woke up a great deal! I definitely noticed Quicker Revs, Better Acceleration, way better idle, and im pretty sure my mileage is increased. its day one so I couldnt tell ya. Anyone who questions the COP upgrade or doubts it is an idiot and they are too afraid to take chances. It only cost me around $35 for the 2002 corolla COPs and only took me 2hrs to wire and solder up everything before work. fired right up and took the 20min drive to work with no problems haha. gonna work on a bracket to hold em down and clean up the wiring tomorrow.

Begi-S coming in 1 week

 

assuming everything else remains unchanged, unless you were getting misfire during a dyno pull there should be no difference to the numbers the car put down.

 

More efficient burn = more power.

Cant say how much though.

Dann

 

my thought is the burn would only get better if the plug gap was changed.

but i could be wrong.

 

Theres no way you cant see gains with this upgrade. I mean come on, Youre getting better spark! Better Burn Like they mentioned. I Put new plugs in it when I first got it which was only about a month ago...didnt change the gap, but could tell a great deal on all of which I spoke on earlier. The car is def. stronger. Maybe no one has ever dyno'd to see what the minor upgrade would improve on. But, with this being said Ill just leave it at this...My car runs and performs alot better w/ COPs and maybe now Ill go ahead and gap my plugs a wee bit more than oem specs to get a little more fire in there. I did replace the stock injectors with some toyota supra 305s. the green guys.

 

Replacing plugs and leads is a power improvement even if your not getting a miss yet. Of course this will help.

Dann

 

Moved into my new house the other day. This thing has a nice 2 car garage and a beautiful shed in the back! HAHA! NE HOO! I finally had the time to pull out my plugs and gap them. Now I was already getting better results with the new COPs but nothing like what I saw after the gap and re-installation of the plugs today. I took the car for a test drive and its funny how the simplest things can make this little thing wake up! I would rarely ever get a chirp shifting into 2nd gear, Now im getting a good skuuuurtt going into second! Very impressive I must say for a nearly stock little 1.6L.

Next-
Im sure gapping the stock spec NGK plugs are going to make them foul out quicker because they arent made for producing that much spark. Sooo Im going to need to upgrade to some that are made for producing a nice spark and lasting a while.

Question-
Which plug would be up for the task? Nice size spark + Durability. hopefully the plugs you mention can be used on both my naturally aspirated setup and my future setup running 5-7lbs boost.

On that note...I sure wish Bell Engineering would hurry up with my "S" kit. Im ready to tear some **** up!!!

 

what spark plug gap are people running at what psi after the conversion?

 

Dang' try Denso iridium plugs. They'll last a long time or maybe the Nology silver ones.

Question, what gap with n/a setup?

 

I'm running 14 psi through NGK 7s, box-stock .040 (IIRC) gap. That's the gap I'd run if it were n/a and that's the gap I throw 14# and water injection at, and there's no misfire.

I see no reason to run a fancy plug either.

 

My Lexus take the expensive plugs and takes 6. I was happy to foot the bill on only four so I bought some really good plugs for my miata. I forget which ones but they cost me almost 9 dollars a plug. It ran like ****! I put some cheap 1.27 plugs back in and ran like a champ. If it aint broke dont fix it, lol.