I have been reading some of the discussion on TS and there seems to be more questions than answers. We’d be happy to provide answers – shoot us questions at
techsupport@unichip.us .
To address the G-Tech Pro question - how hot was it in April? How hot was it on Sept. 1? Did you have the traction control on? Did you run it on the same road? Uphill or downhill? A lot of thing can make a difference in your runs even with the best test equipment. A G-tech is a fine product, but it’s not a precision instrument and better suited to for general monitoring. Repeatability to within 1% isn’t what it’s designed for; if it was, the guys selling the $10k data loggers would be looking for a new job. If you do six runs back to back, you’ll see six different results. We used a G-tech on the 5.7L Tundra. We did 16 runs with and without the Unichip within a 1 hour period on the same day at nearly the same temperature, on the same test road and still had to average. It’s the nature of the beast.
The “lazy” shift sounds like the traction control is on. We found the same thing during our testing. Try turning the traction control “off” ( hold for 5 seconds or so) and put the truck in 4x4 high; this eliminates most of the traction control functionality and gives a better launch (same technique the 4x4 diesel truck drag guys use). Come to a complete stop and then floor it! (Power braking is actually slower even with the traction control “off”).
Some of what you guys are seeing now is why we didn’t post dyno charts. These new vehicles are a lot smarter than our old Chevy 350s, we all know that. They behave very differently, and often not so nicely, on the dyno compared to what they do on the street.
The AFR’s the one guys is talking about sound essentially like it should be. At part throttle (closed loop) the truck runs 14.7-1 AFR which is the federally mandated specification; there’s no legal option there. In open loop (full throttle), we run about 13-1 AFR which is sufficiently rich for safety.
You will see a lot of different numbers from different trucks, on different days, under different conditions, and using different tools. Just because another guy says he makes 10 bhp more over on the other side of the country doesn’t mean he really is. Different truck, different days… etc… Does the chip make power? Yes, about 0.4 seconds 0-60 with the traction control disabled. Does it give better gas mileage? Yes under tow. How do we know? Three months of testing and averaging on 8 different trucks.
Mike Timmons
North American Sales Director
Unichip of North America