When you have a stand alone once its tuned its tuned parameters dont change just because the weather does. No MAF and no 02's my car has no adjustment, thanks for your comments.

 

The tune MOST CERTAINLY changes with the weather.

You may want to check out www.aempower.com and learn a little bit about what speed density means and how it will affect your car with barometric, humidity and temperature changes.

 

Yep, if you want a computer that will adjust to the enviroment, and correct tuning, then one must buy the all mighty Motec, .
$$$, but it is a nice system when it comes to after market ECUs'.

 

Speed Density
Speed Density systems accept input from sensors that measure engine speed (in rpm) and load (manifold vacuum in kPa), then the computer calculates airflow requirements by referring to a much larger (in comparison to an N Alpha system) preprogrammed lookup table, a map of thousands of values that equates to the engine’s volumetric efficiency (VE) under varying conditions of throttle position and engine speed. Engine rpm is provided via a tach signal, while vacuum is transmitted via an intake manifold-mounted Manifold Air Pressure (MAP) sensor. Since air density changes with air temperature, an intake manifold-mounted sensor is also used.

Production-based Speed Density computers also utilize an oxygen (O2) sensor mounted in the exhaust tract. The computer looks at the air/fuel ratio from the O2 sensor and corrects the fuel delivery for any errors. This helps compensate for wear and tear and production variables. Other sensors on a typical Speed Density system usually include an idle-air control motor to help regulate idle speed, a throttle-position sensor that transmits the percentage of throttle opening, a coolant-temperature sensor, and a knock sensor as a final fail-safe that hears detonation so the computer can retard timing as needed.


Because a Speed Density system still has no sensors that directly measure engine airflow, all the fuel mapping points must be preprogrammed, so any significant change to the engine that alters its VE requires reprogramming the computer.

I think the last part is the point I was trying to make.

 

Weather changes the VE of the motor.

 

I don't think anybody in FL has a Motec to compare to though lol.

 

Scott werent you just down here at USP?

 

Yes for a little while.

 

Rolo is the sh&^ !!!! I have known him and his work for years and all the cars he has tuned....he is very good ! Its worth the trip to CTF if its Rolo !!! Quick question, have you heard of a guy at Japtrix in West Palm that supposely is very good with EVO's ????

 

Roger @ Japtrix.

 

Because a Speed Density system still has no sensors that directly measure engine airflow, all the fuel mapping points must be preprogrammed, so any significant change to the engine that alters its VE requires reprogramming the computer.

In case ya missed it the first time What I said still holds true, once the map is set, its set, cold, hot or otherwise. If you want any real changes you have to retune the ecu. Your the tuner here not me, I'm suprised we keep going back and fourth when this is pretty basic stuff.

 

Hi, I know there are several EVO's in Southern Florida......so we are going to do a small meet this Saturday 15th around 7pm or so in the parking lot of the Palm Beach Mall......this is in West Palm Beach on Palm Beach Lakes Blvd. 10-15 seconds off I95.....if your coming from the North you would exit on Palm Beach Lakes Blvd and turn East (left), you will see the Mall on your left side........if your coming from the South, exit Palm Beach Lakes Blvd and turn towards the East (right) and the Mall will be on your left.....if your interested pls let me know if your coming and if you have invited other EVO's so I can let the others know if its going to be cancelled or not.......hope to see you all soon !!

 

I've been tuned by Jestr and 4WS, both are very knowledgeable tuners..

 

really? what happened? i need to speak to trini about a manifold

 

* The fastest and quickest 6 speed Supra in the entire World is here in Orlando, Florida. Uses a Motec.
When he runs here in Florida at 90 degree weather, and goes to New Jersey and runs on 40 degree weather, the car does not need any adjustments.

* The fastest and quickest Sport Compact in the entire World is here in Orlando, Florida as well. Also runs a Motec.

You don't need to compare nothing with statistics like that.

Buy one, install it, and tune it. You may be the next fastest in the entire World too, .