soild numbers
WE WANTS PICS!!!

Thanks <img src="/forums/images/graemlins/smile.gif" alt="" />

Regarding pictures, I feel like I've already posted so many that people are probably getting bored. But I have a TON of pictures on my site. These two pages:

http://www.well.com/user/mosk/blogger.html

and

http://www.well.com/user/mosk/2004_02_01_mosk_archive

probably have the best, but you can go through the whole blog archive (links on the right in the above pages) and follow this project from beginning to the present. Better pack a lunch, though, as it's a long read <img src="/forums/images/graemlins/wink.gif" alt="" />

-Jeff

For a while now I've been second guessing my decision to put 5.29's in my diffs. Was thinking maybe I should have done an engine swap instead. Now that I see such results are possible w/ a toyota engine, I'm relieved. And I have a second engine just waiting to become a project. Nothing like yours though!

No doubt about it, you can get much more power out of it. But you've done a fine job at reaching the goal I am striving for with my Supra--that is to produce very respectable power on pump gas without pushing the limits of the turbo, fuel system and the rest of the drivetrain.

Can you tell us what kind of mileage it gets after you've done a good amount of driving?

Thanks again for all the feedback, everyone. It's very gratifying to be at a point where I can post some solid data, rather than the typical speculation that normally accompanies HP figures.

Geoff: I'll be glad to post some mileage figures in a few weeks, after I get tired of hitting the gas pedal every chance I get. Right now, it seems I can get at least 18 mpg on the highway if I can keep my foot out of it. I have it tuned pretty rich at WOT to keep detonation in check, so full throttle escapades definitely use a lot of fuel, but believe it or not, we tuned the rest of the fuel table for economy. My cruising AFR, for example, is between 13.9:1 and 14.6:1, as you can see here:



Look at the left axis, which is manifold pressure (as measured in kPa, or kilo pascals). Everything below 100 kPa is vacuum, so cruising at 70 mph in 5th gear @ 3500 rpm, my air fuel ratio is a solid (and reasonably efficient) 13.9:1. If i drop down to 65 mph, the AFR rises to 14.6:1, or near stoich, which is right where you'd want it to be for economy.

The key is keeping my foot out of it, which is kinda hard at the moment <img src="/forums/images/graemlins/smile.gif" alt="" /> Look at the rest of the table: as pressure and RPMs rise, so does fuel consumption. At wide open throttle and peak boost, we're throwing a hell of a lot of fuel into the cylinder to keep it from detonating (thanks to California's lousy 91 octane gasoline...). If I go with water injection (just as a "what it...") I can achieve the same effect at WOT by replacing a lot of that extra fuel with water vapor. I'm not sure I want to do that, but it is intriguing.

-Jeff

Your point is well made, Thief, but keep in mind that I am only at full boost/WOT for a few seconds at a time at most, and the excess fuel is there for charge cooling to control detonation. An alternative would be to back the boost off to 12 or 13 psi...but that's not nearly as much fun <img src="/forums/images/graemlins/wink.gif" alt="" />

The fellow that did the fuel and spark map tuning has been tuning EFI for 30 years or so, and has tuned everything from "little" motors like mine to cigarette boats powered by twin 1500hp big blocks. So he knows what he's doing, and I trust him. About all I can add is that these tables weren't derived by chance or carelessness; we worked them out carefully, and the extra fuel is keeping knock under control, and is only being injected very briefly, when necessary. But this is why I am considering water (or water/methanol) injection for the future, because the current situation is an imperfect solution to an imperfect situation.

FWIW, I was able to observe the exhaust yesterday when I was at the dyno (their operator did the runs while I watched from the sidelines) and there were no puffs of black smoke at WOT, and no whiff of fuel in the air to signal, "Christ that thing is rich!"

Boost and low octane gas do not mix well, and 91 octane fuel at 15 psi reveals the limits of the 22RE combustion chamber design. It just wasn't built for this sort of thing, but I'm doing the best that I can with what I have.

-Jeff