Tacoma ECU Tuning for 4.0L

NA has more room to work as going from 87 to 91 is big. But a tune dedicated to 87 won' be, it would be more focus on mpg.

Todays results were only from valve timing an fuel. Ignition was barely touched other than cleaning it up

 

Peak numbers probably won't be drastically greater on a n/a application, but smoother more consistent power throughout the powerband is going to be very noticeable

 

WI'll you be able to adjust shift points, and will you be able to do a tune for towing?

 

On the stock TRD tune and 2.85 pulley peak boost AFR was 12.3+, lean enough to cause detonation.

I noticed it only takes about 3-4 runs before the supercharger is hot enough that the ECU will start to pull out timing. This is also when fueling will start to be all over the place, because of maps that control fuel compensation to air temperature. (fixed)

Overall thoughts :

After hearing the engine with my Det ears today I would personally recommend against running smaller pulleys on a stock TRD tune unless you have additional cooling mods to keep the superchargers cooling system from getting hot, and or higher octane / methanol. You might be okay with 93 and a 2.85 on stock ignition, but there is simply no way 2.55+ stock ignition and 91 octane is safe.[/QUOTE]

What kind of additional cooling mods do you mean?

 

Absolutely, upshift and downshift, rev limit, throttle, etc



For people who run more than stock boost a larger heat exchanger wouldn't be a bad idea. For someone running a 2.55 or even smaller, methanol injection or E85 tuning

 

Do you think removing/bypassing the coolant line that runs through the throttle body would help with heat sink?

I know that I’ve had great results in my old tundra (that had a 4.7) where the intake goes from HOT to only warm.
I only do it during warm weather.
Haven’t done it to this truck, yet, but it seems like it may help some with the heat sink.

Thoughts?

 

I dont know how you measured "hot to only warm" but I cant imagine air flowing through 2" of hot tubing would raise ait very much. Like you said it wouldnt hurt in the summer but I would hate to forget about switching it back out of bypass and have a throttle body butterfly freeze/stick in super cold weather.

 

@OVTune did you have a fan blowing on the front of the radiator during the runs today?
I have thought about running a small pusher electric fan in front of the intercooler and hooking it up to the a/c circuit. The theory is you run a/c when it's warm outside and that's when you would need the extra cooling of the intercooler. It might also help the a/c run cooler with more airflow over the condenser.

 

I've decided that for safeties sake and since this little truck is my dd, I'm sticking with my 2.7 pulley. I'm hoping with the URD headers, afe cai, and TRD exhaust and this tune leaning things out a little, especially on that super rich upshift we can safely end up around 6.5-7 lbs of boost up here at 6600' and maybe 9lbs max on a 50 degree night in Phx at 1500', which I'm hoping results in around 325 rwhp in optimum conditions, as well as the tune picking me up some mpg's, 130 mph speed limiter, another 200 rpm shift points with slightly firmer shifts, the ability to shut off the key in ignition and seat belt buzzer and for heck sakes, get rid of the cel with the darn codes from those headers! I'm guessing the new 320 fuel pump along with the tune will take care of any fueling needs.

And I'm hoping it's tomorrow???

 

Yes I did, 3 fans.

What' you'e talking aboutsounds like something that is called a chiller killer and it works amazing.

 

It was just with my hand. Drove for 30 minutes, intake plenum was hot enough to probably burn your hand.
Bypassed the line, drove same route for same time, and the intake plenum was only warm. Nowhere near as hot as it was before.

Was about 85* that day.
Didn’t take temp readings, but wish I would have.

 

Sorry typing from my phone and it is being stupid.
Coolant lines to the TB isn't the issue. It is that the stock heat management system for the TRD supercharger is not designed for higher than stock boost.
We have seen this exact same issue on the new twin turbo Infiniti, you get 2 good runs and it's boiling hot.
A very large heat exchanger upgrade on those cars will allow you to bump boost up 10psi and no overheating intercoolers.

I took a good look through the components today. The stock exchanger is a decent size if the supercharger peak output was like 5psi, not working hard.
But 8+ psi is pushing the boundary, larger exchanger and even larger resevoir, upgraded pump would do the job perfect.
Or a larger / more efficient supercharger.
An option I spoke with the owner of this truck today about would be tapping two holes into the supercharger heat sink cover and have water meth spray right above the internal heat exchanger. ( for a 2.55 pulley )

the possibilities with the 2nd gen + Stock ecu tuning is going to be so fun now...

 

I do have some questions for you 4.0L guys,
which is going to help with this tuning process and some things to look for.

first and most important

- average MPG of TRD SC owners stock pulley
- average MPG of N/A owners

 

I have heard they are awesome but pricy. I just meant installing say a 10" fan in front of the heat exchanger which would only come on when the a/c kicks on. That way in warmer weather and especially slow or stop Ang go traffic you always have positive airflow. I don't think the stock fan is very effective at pulling air from the ic heat exchanger since it's so far away from it.
Everyone needs to keep in mind the supercharger itself is a huge heat sink so the fluid flowing through the sc is always getting heated, not just under boost.

 

I've got around 15-16 mpg in town driving (pretty rural) and 19-21mpg on the road if not getting into the boost all the time. If driving semi reasonable those figures did not matter with the 3.0, 2.85 or now the 2.7 pulley.

If rodding it, those numbers drop drastically.

 

my 3.5 gets 16mpg highway....

Those mpg numbers are better than I expected. thanks.
Back to adding in more ECUs / calibration IDs for the handhelds tomorrow

 

My truck is stock (no supercharger) and I get around 17mpg around town. On the highway I can get close to 21mpg.

 

I have averaged 12-15 city (very throttle dependent) and up to 18.5 hwy if i keep it under 80mph with these mods:
Urd Cai
Urd spec u headers (rest of exhaust was stock)
UCON ems
S/c with 2.85 pulley
2" lift with 265 70r17 at tires

 

That's some impressive SC mileage. My truck is a heavy pig... I get less than your city mileage and I still have the stock pulley

 

I'm currently getting 11-13mpg with full bolt ons driving conservative. Stock, 3.73 gear ratio and LR/E 265/75R16 all terrains.

Granted I make short trips mainly and my truck really only gets to full operating temp for a few miles before I arrive at work. 14mile round trip commute.