Let's hope this questions goes over better than the last. For some time now, I've heard a loud pumping noise coming from the engine. I began to wrote it off as my injectors are abnormally loud.
But, in good spirit and great faith I'm putting the ? to u all. Is it possible my fuel injectors are working loudly?

 

since when has this been happening? Since the Dry NOS setup?

 

Exactly.

I sincerely hope it's not a big problem but I could pretty much guarantee you your injectors are not the problem.

Check your oil to make sure it's still oil colored and not milky.

Check the exhaust for excess steam or water.

You probably popped a headgasket. I did 7 headgasekts in my learning process so don't feel too bad.

Still running a 5-20 oil with nitrous? You need a good 10-30 or even a 15-40 depending on your climate for the loads encountered with nitrous.

When running a completely new setup it's always a good idea to run some unleaded racegas while you get the bugs worked out to give you extra screw up room.

Any more details on the noise? Does it change with rpms? Does it get louder with throttle or is it purely rpm based? What if you manually hold it in gear at 3,500rpm and let off the gas, does the sound disappear? Is it more of a tick or a knock?

 

Inectors are small electronic solonoids. The only noise you would hear is a "clicking". You described your noise as a "pumping". Pull out your dipstick and see if the noise changes.

 

also what other stuff have you changed from factory parts?

 

Check your oil to make sure it's still oil colored and not milky. Oil good

exhaust good



Still running a 5-20 oil with nitrous? 10 30
gas: 100 octane or 103 depending on day

My dry NOS is changed to direct port/////////CSMENCE

 

just for fun- listen to the ac belt tensioner pulley- if still installed~

its gone bad on more than 1 TL and makes a really bad noise, almost valve like- but with a garage band sound when using a mechanics stethascope