Tom's Fuel Map Controller + TRD Racing Spark Plug

[cali yaris]

^ that's amazing. I'm moving.

[jouna]

where can i order this??? ill do the dyno i get it 4 free i study @ mech tech college and we have a dynojet

[AlainMikli]

Originally Posted by jouna

where can i order this??? ill do the dyno i get it 4 free i study @ mech tech college and we have a dynojet

I bought it from Tom's Store in Japan, 18900yen.

If you want I might be able to ask my friend who still in Japan ship it to you, after all shipping & tax, might be around $320 + US shipping...

[marcus]

doesnt this work the same as the blitz controller?? seems like it its just tapped on the air intake rather than gas pedal..

[AlainMikli]

Originally Posted by marcus

doesnt this work the same as the blitz controller?? seems like it its just tapped on the air intake rather than gas pedal..

blitz tap to the throttle control sensor and which control the throttle sensitivity, and this one tap to the air flow sensor.

[tk-421]

.

[Kioshi]

close to 320 US dollars? You guys do know that in japan items with prices are priced WITH tax or tip included.....LOL So you would only have to worry about shipping and custom charges....not tax. otherwise you are getting ripped off by whomever :P

[crxgames]

I have read some articles on someone making a custom circuit to do the same thing as this on a prius and they were getting good gains...

I really wanna try one of these out now. 2.5" intake, 1zz-fe throttle body, headers, full exhaust, and this could be a pretty nice combo for a daily.

[CTScott]

Originally Posted by crxgames

I have read some articles on someone making a custom circuit to do the same thing as this on a prius and they were getting good gains...

I really wanna try one of these out now. 2.5" intake, 1zz-fe throttle body, headers, full exhaust, and this could be a pretty nice combo for a daily.

Point me to the articles if you can find them. This would be very easy to do if I had some curves to grab data points from. And, it could be a $50 item.

[tk-421]

Originally Posted by CTScott

Point me to the articles if you can find them. This would be very easy to do if I had some curves to grab data points from. And, it could be a $50 item.

Interested!

[crxgames]

Originally Posted by CTScott

Point me to the articles if you can find them. This would be very easy to do if I had some curves to grab data points from. And, it could be a $50 item.

As requested:
http://autospeed.com/cms/A_2658/article.html
http://autospeed.com/cms/A_2659/article.html
http://autospeed.com/cms/A_1458/article.html
http://autospeed.com/cms/A_2661/article.html
http://autospeed.com/cms/A_2664/article.html
http://autospeed.com/cms/A_2388/article.html

I link to all of these as there's good info in all of them. The last 2-3 links are the ones with most of the info though. If you make one of these, I wanna know!

[CTScott]

Originally Posted by crxgames

As requested:
http://autospeed.com/cms/A_2658/article.html
http://autospeed.com/cms/A_2659/article.html
http://autospeed.com/cms/A_1458/article.html
http://autospeed.com/cms/A_2661/article.html
http://autospeed.com/cms/A_2664/article.html
http://autospeed.com/cms/A_2388/article.html

I link to all of these as there's good info in all of them. The last 2-3 links are the ones with most of the info though. If you make one of these, I wanna know!

Very interesting!


Scanning through it I saw this:

So despite trying each of the following, consistent full-load mixtures could not be obtained:

* Intercepting the airflow meter signal with the DFA
* Altering fuel pressure
* Switching the oxy sensors in and out on the basis of throttle position
* Switching the oxy sensors out as fuel pressure was progressively increased
* Switching the oxy sensors out and intercepting the airflow meter signal with the DFA
* Switching the oxy sensors out, increasing fuel pressure and intercepting the airflow meter signal with the DFA
* Intercepting the oxy sensor signals with the DFA
* Disconnecting the oxy sensors at all loads and then setting the mixtures via the DFA working on the airflow meter signal


The solution in this article was to increase fuel pressure, rather than intercepting the airflow meter signals (and 02 sensors). My original thought was that you would need to fool the 02 feedback as well, but with the turbo Prius, even that wasn't consistent.

I'd really like to see some hard data on the Tom's to see if this is worth emulating.

[cfeng]

VIP Auto Salon, a distributor of Tom's in Orange, Ca is offering these for $280 shipped. I'm considering picking one of these up and trying it.

[CTScott]

Originally Posted by cfeng

VIP Auto Salon, a distributor of Tom's in Orange, Ca is offering these for $280 shipped. I'm considering picking one of these up and trying it.

Do a web search and read some of the reviews before you drop the money. It inserts between the MAF and the ECM and fools the ECM into thinking that more air is coming in, so that the ECM will feed more fuel. The problem with it only overriding that side (and not the feedback side via the O2 sensors), is that the ECM adjusts the trim accordingly, so the improvements will only be temporary, unless you routinely clear out the short term data by disconnecting the battery for a couple of minutes.

[Bluevitz-rs]

Originally Posted by CTScott

Do a web search and read some of the reviews before you drop the money. It inserts between the MAF and the ECM and fools the ECM into thinking that more air is coming in, so that the ECM will feed more fuel. The problem with it only overriding that side (and not the feedback side via the O2 sensors), is that the ECM adjusts the trim accordingly, so the improvements will only be temporary, unless you routinely clear out the short term data by disconnecting the battery for a couple of minutes.

You're on the right track, but your messing with the wrong signal.

What other sensor is inside the MAF sensor?...... Intake air temp. What would the ECU do if it was sucking in -40° air? richen the fuel mixture up permanently until it saw warmer air being drawn in.

All the toms unit does is adjust the resistance of the intake air temp sensor so the signal going to the stock ECU thinks it's in cold weather and adjusts the fuel trim accordingly. I leaned this trick while sitting in on an advanced engine management course when I worked at Toyota Canada.

[CTScott]

Originally Posted by Bluevitz-rs

You're on the right track, but your messing with the wrong signal.

What other sensor is inside the MAF sensor?...... Intake air temp. What would the ECU do if it was sucking in -40° air? richen the fuel mixture up permanently until it saw warmer air being drawn in.

All the toms unit does is adjust the resistance of the intake air temp sensor so the signal going to the stock ECU thinks it's in cold weather and adjusts the fuel trim accordingly. I leaned this trick while sitting in on an advanced engine management course when I worked at Toyota Canada.

Whether is messes with the MAF or the IAT, either way, when running closed loop, the ECM will see the effects on the O2 sensor readings and will compensate. My point is that since the system runs primarily closed loop, you have to trick the ECU on both the input and output sides to have a long term effect.


This is from the Toyota T874 course:

The ECM uses the front (S1) A/F or O2 sensor(s) to make corrections to injection duration in order to keep the engine running at a theoretical 14.7:1 (for gasoline) (stoichometric) air/fuel ratio during most engine operating conditions such as idle, cruising, etc.

Feedback from the O2 or A/F sensor (S1) influences short-term fuel trim, which influences long-term fuel trim.

[eTiMaGo]

or if you put your foot down and the ECU runs open loop? then it could have a permanent effect...

Even so, it's a common misconception that more fuel = more powar, if anything, the stock Yaris runs quite rich at high RPMs, you would possibly see some power improvement from a LEANER mixture...

honestly, I don't feel this thing, look into an apexi SAFC that does more or less the same thing but with adjustability based on throttle position and RPM range. won't be as easily plug and play but I'd see it as much better value for money.

[firemachine69]

Increasing fuel rate does not create more horsepower by itself.