Nissan 370Z Forum - View Single Post - GTM Performance Engineering 1000HP MAF CALIBRATIONN -ANOTHER MILE STONE

SAM@GTM · 10-11-2011, 03:34 AM

We would like to share a mile stone we've achieved regarding the stock ECU. Over the last few months we've been working on developing a way to overcome one of the limitations of the stock ECU when it comes to making big power. While Uprev enables the aftermarket to rewrite the stock ECU in the 370Z/G37, there have been a few hurdles to jump when pushing the envelope over 600whp. Since day one, we always kept in mind that people will only want more power. In anticipation, we chose to use 3" MAF piping in all of our turbo kits and the GTM Stage 2 Supercharger Kit. Doing that gives us more headroom when it comes to MAF Voltage. It's a mechanical calibration that allows us to get the factory MAF to read more airflow. Even at 600whp, the MAF voltage is getting up to 4.9 to 4.95 Volts. While this is still below the 5 Volt limit, it does not give us any headroom to compensate for changing atmospheric conditions (such as a cold morning). The next step was to find an aftermarket MAF sensor that can replace the factory Nissan unit with the same physical dimensions and connector. Of course, that was the easy part. The challenging part is to produce a good calibration that contains a linear MAF curve so we can get the best resolution and still plenty of headroom for more horsepower while retaining factory drivability. This development translates into having a 1000hp car that starts up every time and can be driven normally on the street.

Ultimately, this has greatly expanded the capabilities of the factory ECU to the level of performance commonly relegated to a standalone EMS. While some standalone EMS options may have some additional features that set it apart, we've really narrowed the gap here.

To close the gap altogether, we are working on developing a system that will enable us to retard ignition timing in response to knock as well as boost cut. Once that is developed, there will be no reason for a standalone EMS in this platform.

Here is a dyno graph and a cipher screenshot showing only 4.5 volts maf reading @ 886 RWHP witch is equivalent to roughly about 1036 BHP .

Will be posting up a video of the car on dyno shortly .

Sam

10-11-2011, 03:34 AM	#1 (permalink)
SAM@GTM NOT AN ACTIVE SPONSOR. DO NOT BUY Join Date: Dec 2008 Location: CALIFORNIA Posts: 913 Drives: 370Z Rep Power: 17	GTM Performance Engineering 1000HP MAF CALIBRATIONN -ANOTHER MILE STONE We would like to share a mile stone we've achieved regarding the stock ECU. Over the last few months we've been working on developing a way to overcome one of the limitations of the stock ECU when it comes to making big power. While Uprev enables the aftermarket to rewrite the stock ECU in the 370Z/G37, there have been a few hurdles to jump when pushing the envelope over 600whp. Since day one, we always kept in mind that people will only want more power. In anticipation, we chose to use 3" MAF piping in all of our turbo kits and the GTM Stage 2 Supercharger Kit. Doing that gives us more headroom when it comes to MAF Voltage. It's a mechanical calibration that allows us to get the factory MAF to read more airflow. Even at 600whp, the MAF voltage is getting up to 4.9 to 4.95 Volts. While this is still below the 5 Volt limit, it does not give us any headroom to compensate for changing atmospheric conditions (such as a cold morning). The next step was to find an aftermarket MAF sensor that can replace the factory Nissan unit with the same physical dimensions and connector. Of course, that was the easy part. The challenging part is to produce a good calibration that contains a linear MAF curve so we can get the best resolution and still plenty of headroom for more horsepower while retaining factory drivability. This development translates into having a 1000hp car that starts up every time and can be driven normally on the street. Ultimately, this has greatly expanded the capabilities of the factory ECU to the level of performance commonly relegated to a standalone EMS. While some standalone EMS options may have some additional features that set it apart, we've really narrowed the gap here. To close the gap altogether, we are working on developing a system that will enable us to retard ignition timing in response to knock as well as boost cut. Once that is developed, there will be no reason for a standalone EMS in this platform. Here is a dyno graph and a cipher screenshot showing only 4.5 volts maf reading @ 886 RWHP witch is equivalent to roughly about 1036 BHP . Will be posting up a video of the car on dyno shortly . Sam Last edited by SAM@GTM; 10-11-2011 at 03:45 AM.