Well here it is guys, made a trip to the dyno today, and got the unichip tuned. I tell you what I was astonished to see the power that the truck made with a "little" fuel added. The first sets of runs were made with only 2.8psi of boost applied.
I started the series of dyno pulls with a base just to see what the stock programming would do. I found out no too much. Went way lean 4000rpm but still managed to make 254 hp, and 306 ft/lbs.
The next step we took was to just go in and add fuel with the unichip to the stock fuel system, with the Walbro 255 of course and see what happened. Once we got the programming right, the stock hardware was able to sustain 327hp and 430ftlbs. Not to shabby for the just stock injectors with a little programming.
With the unichip system I opted for the unichip and the 9th injector driver module. With the 255 in the tank the RC Engineering 440CC injector was just right to put in the intake tube. This served no only as a means of adding fuel but I believe also aided in the cooling of the intake charge. In the Unichip program the extra injector was only utilized in the load of 70-120 and 4000-redline speed/load sites. This made sure that the extra injector would only come on when it was needed. The first step that was taken was to just open the injector was much as we could and see what the AFRs did. Keep in mind I am still only running 2.8psi of boost. Here we suffered a loss of power and torque because of the super rich fuel mixture, but now had plenty of room to go in and crank the boost.
The Blitz boost controller made this easy, dialed in the next setting and was ready to go. So this run was made with the exact fuel settings as above but with a total boost of 4.5psi. The power instantly came up. Made 314hp and 414ftlbs. However, the AFRs were still off the map. So naturally with all that fuel, why not had more "air...boost that is!
So we cranked it up to 6psi, with no adjustments to fueling, the extra boost brought the AFRs up to the 11s and the power up to 353hp and 453 ft/lbs. At this stage we noticed that at part throttle positions the unichip was pooring in more fuel than needed. It so happened that with the particular load that the dyno provided it didnt show up in the full throttle passes but only when at part throttle sites in the fuel maps. We moved to remedy this issue and in the process created enough heat to make the hp numbers drop. So we let her cool off before the next run. My goal was 350hp, I had already met that but I fuel to spare and a 4.7 just begging to be plucked.
At these boost pressures, the optimal AFRs are theoretically between 12 and 12.5. We were currently in the area of 11-11.7, why not see what the additional boost will do. So I took her to 7-7.5 psi of boost and made the same pull with no fuel modifications. Off of the additional pound of boost I picked up 43hp and 56ftlbs. For a total of 395hp and 509 ft/lbs. Unbelievable!!!! Thats where I stopped, I figure 400rwhp with good fuel is safe and will be enjoyable.
What did I learn from all of this?
First, always make sure the laptop communicates with the Unichip before going to the dyno (serial cable got crushed).
Second, there is really no need for a super fancy fuel system to get the power that a stock motor can handle. All I had was the extra injector and a Walbro 255 intank, maybe upgrade to a 500-550cc injector just to get the duty cycle of the the 9th injector down.
Third, go low boost, play it safe, and make sure the fuel is there, once you know, pour the boost on in.
Fourth, after aiding in the tuning of a Ininifty G35, intercooler effiecieny and turbo size are huge. When you watch an intercooled Greddy Kit kick out 160deg intake temps and make little power, and then a setup like mine maybe 100 degrees, make big power, you know something is up. The TO4R Turbo that I used is also very efficient at low boost pressures. Meaning that is does not produce alot heat in just the compression phase. Most of the heat just comes from the turbo being hot from the exhaust.
And Finally, dont be afraid to do it yourself. Read, talk, do what ever you need to, to obtain knowledge and condidence in your abilities, take a deep breadth and do it. I have always found that if you put your heart into something you will respect it more in the end.
Dyno Charts and pics of all the final install stuff I did will be available at:
and eventually a full write up on the site was well. If yall have any questions feel free to ask. A big thanks goes out to Mark Budenhage with G3 Motorsports at Grubbs Infinity(Dallas, Unichip guy) and Scott and Eric at A&S Motorsports in Fort Worth (dyno guys).
