[NOLA_1906]

Originally Posted by thumbster

I really wish people would stop dwelling on how something performs on a dyno.

We're not dealing with a race vehicle here, but rather a truck that's driven on the street and is used to tow and haul things. Road tuning is the only way to get good real world driveability and usable power gains. Dyno results only give the tip of the iceberg and only when the conditions are right. You can loose 20 hp right from the start if you have a heat soak condition or if the cooling fan clutch locks up. Let's also not forget that you can't see any reliable numbers in the lower rpm band due to the auto trans not wanting to see full throttle in higher gears and the torque converter not being locked because of it. The list of variables goes on and on. You don't achieve part throttle performance and driveability from WOT tuning.

A/F ratios of 15.1:1 are no problem at all on a modern aluminum headed engine like the 5.7 Tundra engine. In fact it wouldn't surprise me if you'd see A/F ratios of 16:1 or higher under light cruise conditions. This is how you get better fuel economy and as long as you have a knock sensor in the loop and look at your EGTs, you're ok. If this engine can run on 87 octane with 10.5:1 compression, it can deal with leaner A/F ratios with slightly higher octane fuel and likely have quite a bit more part throttle economy to begin with.

Unichip is a good company and they support their product pretty well. I think they will be the leader for a while in piggy back tuning for our trucks - at least until someone else comes out with a flash tuner.

Thumbster,

You summed it up in laymens terms pretty well. Thanks. After 15 or so dyno runs, I'm pretty sure he saw some effects of heat soak in addition to the Tundra actin' a fool on the dyno, lol. Unichip did not release dynos because of this phenomena with the Tundra. Its not because they were hiding something. Its because it would not be in their best interest to show dyno charts that did not reflect the real world performance gains that they achieved. Also, with the upgrades that they have coming, I don't think a flash tuner will produce anything that the Unichip can't. Just wait. I just refueled this morning and I'll be driving normally as I always do. Mainly city driving with traffic and occassional full throttle bursts on the Interstate. Stock I saw 13.8-14 mpg, with Volant intake, I'm at 14.2-14.3.