Dangers of Running Rich, 3sgte owners Options

[jgreening]

Well, ten days into ownership of the 3sgte and I can safely confirm what everyone else has said over and over....these engines run very rich. I have read many posts about this and about the fact that Toyota made it this way to avoid lean conditions. However, I would imagine that running an overly rich condition cannot be good for the engine over time either. I am wondering whether for engine longevity and reliability purposes, us 3sgte owners should take action either through an S-AFC or stand alone to lean out the A/F ratio. Obviously, we can see some horsepower gains from doing so but I am particularly interested in responses dealing with engine life.

[jgreening]

Lagos, I am still running the 5sfe pump. Jayson claims it will be fine up to 18 p.s.i. Even with the 5s pump, the mixture is way rich. Anyway, the pump only supplies what is demanded from the ECU so, in general, the pump shouldn't act to cause rich conditions even if it is way overkill.

Also, there is a very interesting thread over on mr2oc.com that suggests you should never upgrade to a supra pump unless you upgrade the fuel rail. It was started by Wolfkatz (sp?) and has a lot of testing to back up his claims - although I must admit, I couldn't follow much of the fluids engineering hyper talk. Also, its quite possible that the conclusions only refer to conditions above the horsepower levels we find ourselves at - so far.

This post has been edited by jgreening: Sep 29, 2004 - 11:13 AM