Tacoma - OVTUNE - VFTUNER - Update Info and Original Development

That's not necessarily true. It's quite possible it's making that much power, but doing so by having the MAF reading skewed, registering a lower volume of air. The ECU would respond with less fuel in open loop, causing it to run leaner which may make more power, but with increased risk of detonation.

Wouldn't be an issue if you tuned for the intake, but if you did you'd likely see those gains go down as the MAF scaling was made more accurate.

 

Isn't it really as simple as worst stock dyno pull vs best modified dyno pull?

 

Why would a MAF read a lower volume of air if it's an aftermarket air intake designed to ingest more air?

I'm not going to get into a pissing contest on this, but having much experience with intake/exhaust tuning on high performance motorcycle engines (both carbureted and FId) in another life, I can assure you that you are not going to get a repeatable 10% increase in power on the SAME exact vehicle in the SAME exact environmental conditions simply from changing the AIR INTAKE setup (with no fuel tuning AND exhaust changes) on an otherwise stock OEM vehicle. OV knows this, hence his "crazy" reference. And with that I'm done on this particular topic.

 

YES - It would be great to see the version numbers along with the key changes you're seeing in each for the ATs.

 

Long story short: Fluid dynamics.

I also have tuning experience...on vehicles with a MAF and aftermarket intake, including tuning for methanol injection. No pissing match - just facts. Aftermarket intakes can and do alter the MAF's ability to read volume accurately and when in open loop where fueling is done by way of MAF only (with adjusted long term/short term fuel trims), that can alter the AFR which will produce a repeatable power increase, provided it doesn't result in detonation and learned timing decreases to compensate.

 

Explain to me, why a MAF sensor would read a lower volume of air after installing a intake component designed to INCREASE airflow...or are you suggesting that they market a product to INCREASE air flow, but they secretly design it to DECREASE air flow in order to fool the MAF into turning down fuel, leaning it out and making more power? We are talking about those dyno charts above and their claims of power based on INCREASED air flow, not theoretical situations...

http://afepower.com/product-catalogs/air-intake-systems

 

A MAF measures temperature drop of a heated element to calculate mass air flow (typically, there are other types). A larger bore, or an intake that directs air differently than factory, can locally lower the mass flow or velocity near the sensor causing a lower reading. Lots of weird fluid dynamics at play with fluid sensing.

 

And yet they claim to massively INCREASE the air-flow to get their "gains".....it's a "crazy" world....

 

Are you familiar with Fluid Dynamics? The MAF's measuring airflow via the hot wire. The voltage scaling for the MAF is carefully calibrated for the design of the factory intake. As you change the design of the pipe (diameter, direction, etc) you change the flow characteristics of the air within it and may introduce unintended turbulence. This turbulence will create changes to the resistance measured by the hot wire. It's not a matter of volume, it's a matter of how it's measured.

And while I cannot speculate what the intended design was, I have seen intakes that made power over stock because the MAF was reading incorrectly and leaning out. When scaled appropriately to get AFR's back to target, the power decreased...sometimes back to stock levels...sometimes below stock...and sometimes above stock. Depends on the intake.

 

MAF measures air velocity... when changing the intake components that increases cross sectional area per the gas laws velocity of the flow drops causing you to lean the engine bc you are reading a slower velocity. You are achieving the same volume of air into the engine but at a slower velocity over the sensor. The computer than calculates the volume of air based on fix variables like cross section area of the stock intake. Once you change the cross section area you are changing a fix variable that can not automatically adjusted assuming timing is based dependently on air flow.

 

Nothing, but he has a truck at home that he was able to get the tune installed, but couldn't test anything because of going on vacation. Also has the spec u exhaust I believe which is something people have been interested to pair with the tune.

 

From OV in no time at all:

Hello your kit came with a small black USB which is our rev2 dongle.

It is already pre-registered so you can skip the registration part, go straight to page 11 of the instructions

 

I would LOVE to know what Toyota has been changing (and what they havent). That could be pretty telling in terms of what they have planned or are trying to do with the truck. It might even hint at what they consider to be the weaknesses of this engine/AT setup.

 

Yes please.
I want to guess TCC manipulation.

 

The bs was mentioned by a mod in another thread a while back. As long as things don't get heated they tend to allow it because it sparks conversation and new ideas/issues that can get resolved. It also keeps threads alive and forums going instead of dying off or getting lost in other pages. If you don't want to see all the bs, ignore the people who are doing it and it'll clean up for you. Ignore everyone but the op if you want and you'll only see what the op puts up here.

 

Or just go to page 1. Click the op's name>profile page>postings.

This is how I find everything the op has posted.

 

Yep that way works as well. He mentioned complaining about the other people posting bs so I mentioned the ignore part. Looking at the op's profile is definitely a way as well and faster.

 

this is the key for anyone wanting all the info laid out for you.

 

I just follow him, follow this thread (and read every post), laugh at the people who complain about the BS and can't search, and post a bunch of BS while passing the time.

Here's a mai tai with an umbrella picture I took yesterday

 

Now was that so hard?... I'm sure you spent significantly longer bitching then actually answering the questions. No time to weed through 140+ pages of which 90% are junk postings. That's why I love TacomaWorld... people think it's Pirate4x4... but it's not.