![[ProjectSTi]](https://blogger.googleusercontent.com/img/a/AVvXsEgqVanZg9w-c4hS30-vwmY1vqbhTqkAlpb0a2RMSq9lGDlNvjWa6PF_M3Dcb_y6Lzef4wChPlx3cJivdW2n8v3tjZ8PrUJzH4D7Ktx4Jhzz0H0hrUmEXP80ofkZt9y5xM1irMQWm787FTXxzia9UsFrNI3MwfiwgLlTpAO-55uip-USRGdOW4WYicZieO0=s174)
After the initial blast of NOS, I really couldn't feel much, mainly as I had the settings down to a minimum on the minimax controller.
I started with 30% load with the maximum ramp up time to see how things went. There wasn't much change on the wideband gauge and I was having a look back through the log to ensure that I didn't lean out when the NOS was injected.
Todays session, included keeping the 30% initial injection (start power), but I lowered the ramp up time so that the time to full injection was shorter. I did started injection about 5000rpm in 2nd gear and I really felt a "jolt". I decided try it another way and loaded a 60% start power, but this time over a longer injection time. This then gave another nice kick, but more progressive, without the initial jolt on the engine and drive train.
I started with 30% load with the maximum ramp up time to see how things went. There wasn't much change on the wideband gauge and I was having a look back through the log to ensure that I didn't lean out when the NOS was injected.
Todays session, included keeping the 30% initial injection (start power), but I lowered the ramp up time so that the time to full injection was shorter. I did started injection about 5000rpm in 2nd gear and I really felt a "jolt". I decided try it another way and loaded a 60% start power, but this time over a longer injection time. This then gave another nice kick, but more progressive, without the initial jolt on the engine and drive train.
In order to make this graph, I used the 5V serial output wire from my AEM UEGO gauge and connected to a USB adapter, which was soldered together using a serial/USB adapter. This then allowed me to connect to the gauge and use hyper terminal to read and log the AFR in real time.
Once ready to start the power run, I started the log and although there is no RPM log, its obvious from the way the AFR drops in the graph, when you change gear. You can see from the 3rd gear pull, that that there is a momentary spike, which is where the nitrous was injected. The engine leans out a little here. Its still safe, on the RICH side of 14.7 but I don't want to risk anymore just yet. One way to tackle this is to look at the fuel map and increase the fuelling for the whole section above 4000RPM when I come to use the NOS, then remove the excess fuel when not on the drag track.
The main points for now, is that it felt good, you could feel an instant increase in power ad the engine pulled freely. AFR was safe and it passed this test. What I will do next week, is keep the same fogger nozzle for the Nitrous feed, and increase the nozzle for the fuel feed. That way, more fuel will be sprayed into the mix and the same original amount of nitrous.
The NOS manual states that it is a trial and error strategy like this until you get a power/AFR relationship that you are happy with. Now Im comfortable with the Minimax controller and have the settings I like, Ill swap the fogger nozzles when I get the chance and continue tuning from there.
Comments
Post a Comment