what spark plugs do u guys recommened for 25lbs of boost? i have used everything from 5's up to 9's and even some iridiums... after the last 8's i went thru i put some sevens in and n they were ok for awhile till i raced some genesis on the highway n then when iwould give it full throttle afterwards my car would cough n sputter n then take off... i changed those that day to some ngk iridiums and they were fine aswell untill i got on it n now they do the same... act fine when driving normal but as soon as i start to put it to the floor the car starts to cough n sputter

 

I use the ngk's and have never had a problem. I run 25 psi all day. I am suprised you have gone through so many. Sounds like you have a different problem.

 

I am switching to NGK BPR7ES and will be running 22-23lbs of boost.

I am unsure how the OEM plugs would hold up to that boost level though.

 

I had OEM plugs and coil packs that were fine at 20lbs for a while.

 

I would go with the 8's. Are you tuned for 25 psi?? What is your AFR at full boost??

 

sounds like a bunk *** tune killin your plugs..

 

^ agreed.

 

im not really sure what my afr is at full boost... i traded my wideband n apexi boost controller for tomie rods n wiseco pstons... it smells a lil rich in warm weather n lean in the winter, if that makes sense... it was tuned by previous owner for 18lbs but i added bolt ons awhile back and a local dsm mechanic said i should b fine to bump boost to 25lbs n get a tune later... i am learning as i go as i havent had experience at all with turbo cars just v8's

 

wait...

It was tuned for 18psi.

You added mods.

DSM mech said you could bump it to 25. And your driving around like that?!

 

Get another wideband. If the mechanic left it rich you might be able to turn the boost up a little. But without a AFR how are you going to know what your car is doing for fuel on the additional boost. This sounds dangerous to me.

 

im using the br8eix (ngk iridiums) and they have been fine.. id give those a shot.

 

ya rogue that pretty much sums it up... i didnt really ever know anyone with a turbo car so i was just pissing in the wind and bolting parts on without any real advice... i guess i didnt realize its a bad thing not to get tuned after doin so... but thats y im on here now lol so thanx for the help...

 

i have the br8eix iridiums in now... two weeks old and 1st thru 3rd at full boost is great...4th coughs n sputters till i let out n then is fine if i jump back on the gas... but 5th seems laggy all the time unless im up over 100mph then smooths out...

 

if its tuned for 18 psi -- for the love of god.. put it back to 18psi til you get a wbo2.

 

Yeah, get it tuned... do not go to full boost. You are probably running the thing way too lean at high RPM. Get a tune before you do damage to the engine.

If anything, get a tactrix cable, Evoscan etc so you can start to learn what is happening with the car. logs etc.