Intake temps are essentially the same as ambient according to my OBD-II reader, I have no idea what my CDT is but it probably isn't too bad since it's relatively cold here...

 

So I looked at rpms today on the way to work, I about 2075 rpm at 65mph, and about 2400 rpms at 75mph. So the calculations based on the transmission ratios seem to be correct.

Just for fun, I whipped up a graph comparing engine/vehicle speed and 4.30 vs 5.29 gears. Seems about right, subject to some slight tire diameter error.

 

Interesting graph, I think I see now why that 4runner out ran me on that hill. You have a really sweet 3rd gear that takes you to the peak of the power band in the 80-90mph area. I was lugging some in OD, he was probably in 3rd gear.

Why did you stop the graph at 100mph, lets see what your top speed would be at redline, LOL.

 

LOL, here ya go Dale. At 5500 rpm in 4th gear, I'd be doing 177 mph. Fortunately, my tires explode at 122 mph, and the speed limiter kicks in at what, 102?

You should definitely shift out of O/D if you want to pass with authority.

 

Wow, about 145mph for me. I guess I'm not geared too low then, LOL. Can you image 33" mud tires going 145mph, I wonder if they ever hit that in the Baja 1000.

 

So with my 3.91 gears i am good for what? 200mph+?

Oh, and the speed limiter kicks in at 109 BTW

 

You found that out huh? BTW there is a way around that limiter, URD used to sell the little gadget to do it. I guess their lawer told them to quit selling it.

 

LOL, i never said that..........



And yeah i have heard there is a way around it, depending on price i might do that just for when i dyno it as the speed limiter kicks in at about 5000 RPM and there is still 1k rpm to go. We will see.

 

BFGoodrich Baja T/A's are "T" speed rated, 124mph. I doubt trophy trucks get up past 110 miles per hour much in the Baja.

 

Cool

 

That may be the only way I'll ever hit 109mph, sitting on a dyno, LOL.

 

So Dale have you determined if you have a narrow-band O2 sensor or a wideband O2 sensor yet? I hear URD is working with SplitSecond on a new ESC unit that will work "perfectly" with Toyotas that have narrowband sensors, I may have to look into getting one...

 

Any plans to run it on the rollers?

 

Not for sure, I haven't taken it out to look. Everything points to it being a wideband though.

I still run in open loop a lot just cruising down the highway. Most of the time its just slightly rich though, like around 13.9-14.2 area. Although I did have one little scare in the middle of my trip cruising along about 65mpg, very low throttle and I see my A/F like around 11 and dropping. I was like WTF??? I let off the gas and coasted then went back to speed and everything was fine after that, it never did it again. Maybe it freaked out like yours huh?

 

No plans, it would be nice sometime though. Not sure if there is even a place to do it around here.

 

Yeah, "tricking" our engines into doing what we want is always an imperfect science...

I still want to look into an SMT7 to replace my FTC1. The SMT7 uses wideband O2 input for tuning, so your fuel map is a bunch of AFR values rather than fuel trims. You just tell it the AFR to aim for and it does what it needs to get there I guess. Sounds pretty frickin' sick, and it has two hot-swappable maps so you could run agressive and conservative maps. In theory it also can control a 7th injector, so I might be able to use it to control a W/MI kit as well...

 

Now that sound great! Why don't you lead the way Brian.

 

What he said, i am interested as well now that i am about to join ya'll in the SC club.

Of course first i need to get it rebuilt and installed....

 

I want to, but it won't be for a while yet. It would be totally sweet if I could find one for cheap used, but for now I'll just have to stick with what I've got. It might be possible to fake out the oxygen sensor using one of the analog voltage ouputs on the SMT7 (14.7 AFR on a narrow-band oxygen sensor is just a constant 0.50 Volts, nothing too complicated about that), but more likely I will need to wait until SS comes out with their "ESC-2.0".

I do think I'm going to get an SMT7 rather than go full data acquisition however, since they both would cost about the same (actually data acquisition would be more $$$) and are both to try and solve the same problem- easier tuning with the possibility of upgrades later on. Supposedly you can get a base-level standalone engine management kit from Megasquirt for close to the price of an SMT7, but going standalone would be biting off a lot more that I would want to chew I think...

 

I made a support bracket for the down pipe today. There have been a few guys having problems cracking the crossover so I wanted to help support it and hopefully avoid that problem. Toyota has the down pipe supported in this area from the factory so maybe they know best. In fact I made this bracket from an old factory bracket.