i had my car tune on 6 heat range plugs(gap 32) and now ichang e plugs to 7heat range(gap28). now my car part throttle run like **** and my temp seem to raise at times. do i need another tune or just switch back to my old plugs.

 

bump

 

Well, if ur car was tuned using 6 range plugs then u should stick with those. Any changes u do to ur motor will change the tune.

 

If u were running 6 heat range plugs with no problems y switch to 7? I say stick with 6.

 

do some reading on how to read pugs, go make a run to the top of 3rd gear and read the plugs. you will know what to look for if your plugs are to hot of a heat range.

i run ngk 6 on my sohc at 5 psi but will go to the 7's when i turn up the boost.

 

i know that i need to run colder plugs. at the time of the tune i did not have anything but 6 heat plugs. now i want to change to 7's. tune it to 400hp w/ 6's.