How many people think rich is safe?

[jakesz28]

A theory from a nitrous tuner from NOS. Rich is worse then lean when you spray more the tune has to be right. When your rich your spraying more fuel then you can burn. It will wash down the side of the piston and rings. Which cause them to get hotter then normal. Over time this will weaken the piston and rings. When the fuel puddles and burns in the ring lands the top ring land will lift. Then the second ring will usally get tight. At this point it will let oil in and dotanate. Melting the piston. Which is when must people say it was lean. Wrong answer rich tunes have killed more motors then lean ones. This guy has cars running 3 foggers and each time the next stage comes in it is leaner then the one it follows.

How many of you nitrous users beleave this statement? I will be testing his tuneups or sugestions tommorrow. I have a 6 jet spread with the fuel at 5.5psi.

[Z28pr0jekt]

I'm friends with a couple professional tuners... while if the car is excessively rich then yes it can wash the rings over time and cause the problems stated. BUT on a SAFE tune, I would much have the car a tad rich than anywhere near lean. But when I say excessively rich, I'm talking 10.0:1 and less. Lean wise I'm saying 13.5:1 and greater (on FI motors) and 14:1 and greater on NA motors.

[Twisted Z]

I am still in the air. I have seen both side but to chicken to test it ;)

[FICINJECTORS]

I'm friends with a couple professional tuners... while if the car is excessively rich then yes it can wash the rings over time and cause the problems stated. BUT on a SAFE tune, I would much have the car a tad rich than anywhere near lean. But when I say excessively rich, I'm talking 10.0:1 and less. Lean wise I'm saying 13.5:1 and greater (on FI motors) and 14:1 and greater on NA motors.

:stupid:

Any motor, nitrous or otherwise ran excessively rich will cause cylinder wash and puddling. But I agree, would rather be a little rich than at all lean.

[Fastbird]

I'm with the other guys. There's safe rich, then there's unsafe rich. I would much rather be on the safe rich end of things than going for that last 2 HP on the dyno or something and going too lean.

[Keys Z28]

Imo i would rather be a little rich than lean. but im also running a 125 shot dry zex kit so i'd rather have that little extra fuel in case..

[BAd Dad]

A lil fat is safe

[jakesz28]

Rich or lean I don't think it will hurt the smaller shoots. But that's just my opinion. I feel timing has more to do with hurting parts then the AFR. Octane and spark plugs all come into the mix. How many people are running projected tip spark plugs? I put a set in this motor when I fired it up because that is all I could get locally, that would fit. By looking at the plugs they were to hot on motor passes and the heat range should have been equivilet to a ngk 8.

[Chopstix]

Rich hurts parts...lean hurts part...too much timing hurts parts....wrong spark plug hurts parts.

This is why you should always have the car tuned for any modification.


But for the avg guy spray a 100 shot...a little rich is better than a little lean.....but as the shot size increases the importance of having the correct tune is increaseing also.

[Twisted Z]

Well I am to reading the plugs and adjusting the rest for the most power on a good looking plug ;)

If it does not rain I will be reading a few sets this weekend.

Heck with my new Speed Inc. alternator kit I can even get the passenger side plugs out when it is hot now!

[OutlawZ]

This is not theory it is truth. Excessively fat tuneups have been destroying motors for years by doing just that. Lifting ring lands.... Your motor will take lean passes if there is not excessive timing....

This of course usually doesn't matter as much with 100 and 150 shots but as the shots go up progressively it will matter much more.... And we're talking rich conditions like 10:1 and below..... biggest thing is make sure you pull more than enough timing for whatever shot you are running.....

This is why pressure in the bottle matters for wet kits as your tune will be way fat the less bottle pressure you are running. your fuel pressure will remain the same but as bottle press decreases the fuel mixture is much more fat..... run those bottles at RECOMMENDED pressures.... and likewise don't run them way overpressure trying to get that additional power.... cuz that power could lean your motor out.....

[jakesz28]

I agree with what you said but I think even some of the manufacturers reccommended tunups will hurt parts over time, from being rich. The plate I got said a 4 jet spread basiscally on every tuneup large on the fuel side with 7 psi fuel. I reversed two tune ups already so I was larger on the nitrous jet with only 6 psi of fuel pressure and they are just about there just a little rich.

[Twisted Z]

Hell I would be happy not to drop below 850 PSI on a pass...with any starting pressure.

My last Dyno pull was 12.3 to 1 AFR with 32 Degree's. Clean plugs and flat power :D