im running a megan header, trd exaust, voltage stabalizer, ground wire kit, pulley, k n intake and a 75 wet shot.

lately i seems like it has a differnt exaust tone and more engine noise. i checked the compression and from left to right 179 179 181 190. are my rings bad or a cracked head? 40,000 miles on it and lots of NOS. im not sure what is exactly going on if anything but hopfully i can dyno it again and see if there is a power loss. And it also had a slow radiator leak till i put stop in it.

i also took it in to a shop and they told me my radiator fans were shot but i checked the fuse and it was lose. i think i didnt put it in all the way after installing the NOS.

(COLBALTS AND NEONS ARE MY FAVORITE BREAKFAST)

I may be wrong but your high 190 looks about right. I am not sure what toyota specs are between your high and your low but Its not a cracked head. The 179's might tell me your head gasket is starting to give out. Your diffrence is only 11psi thats not bad considering you are using nitrous. Most cars will have a few psi diffrence in the cylinders anyway

those #'s are acceptable in my eyes. i think the general rule is anything over 10% difference is notworthy. I'm bad with math but with those #'s i think ur lookin @ like a 6-7% difference.

Bah, those numbers are pretty normal. Looks like a beat on engine but nothing to be alarmed about. If it was 179-135-90-190 then I would be freakin haha. Was the engine hot when you tested? Did you have all spark plugs out when you tested..?

Good Question GARAGE, cuz the way the numbers go up from left to right is what you get if you dont pull all the plugs to begin with. So as you take out more and more plugs, you get less and less resistance, and a higher number.

how did you conduct the test.. warm engine? TB fully open? fully charged battery? same number of cranks for each cylinder?

btw.. those numbers look fine

watching