More E85 D-Series Tuning...

This car belongs to Marc from Simpsonville. He brought the car in last night for a tune on 93 Octane, and then a tune on E85.

Marc uses this car to compete in SCCA STS class races, so the engine is essentially stock, due to classing rules, with a few bolt on parts. Since rules on power modifications are so strict, he wanted to convert to E85 to gain any available horsepower. Marc competes on a National level in this car, and is currently ranked 3rd in the nation in his class.

Since he will be driving the car to all events, he wanted a 93 Octane map, as well as the E85 map, since E85 may not be accessible in all areas.

Here is the setup:

Stock D16a6
AEM Cold Air Intake
Custom Header
Stock Cat
2 1/2" Exhaust, through a Burns Stainless Muffler

Stock fuel pump
Stock injectors

Tuned on Zdyne (Usually we recommend converting to OBD1, but due to class rules, Marc needed to run the OEM ECU.)





Here is the chart. The brown line is from the 93 Octane tune, and the green line is from the E85 tune. Notice that there are gains through out the powerband, resulting in around a 5% gain in peak power and torque.





The D16a6 is a low compression, low HP engine. Still, good power gains were had from simply swapping fuels and re-tuning. In a high compression, or boosted application, E85 will allow the tuner more freedom with ignition timing, allowing your engine to produce more power, with less risk of damage to the engine.