Just wanted to let everyone know about my experience with Bryce and the Vipec...
Bryce hooked me up with his basemap to get my sled out on the snow this past weekend. I built my kit myself (comp ct2-4747, oilless, 1000cc injectors in place of the stockers, turbosmart compgate 40, tial housing, turbosmart vee port pro). I used the OEM Bosch TMAP sensor for barometric pressure reading, and a GM 3 bar map sensor pinned into a seperate analog input into the ECU. Also used a GM IAT sensor into a seperate input and turned off the Bosch temp sensor.
The vipec has the control, function, and interface to be able to EASILY take Bryce's map and adapt it to my set up by:
-Scaling fuel delivery by 43% across the board to account for the use of the 1000cc injectors over the 630cc injectors
-Reduce fuel delivery at lower injector pulsewidths to account for the non-linear flow at low pulsewidths of the big modded injectors
-Create a 3D deadtime compensation table (voltage vs boost) since I am not using a 1:1 FPR
-Scale up 5D boost pressure fuel correction based on the decreasing effective fuel pressure.
All this took about an hour to do at home with some estimations based on math. The end result is the sled fired on 1st pull and took about a half hour to fine tune at the hills. We rode at Rabbit Ears which is ~9400 ft or 68-70 kpa barometric pressure. I was able to hold an AFR of 11.5- 12 at WOT and rode 40 miles the rest of the day without adjusting anything in the vipec. Since it was my 1st real shakedown ride I used a 3 psi turbosmart spring in the wastegate which ended up yielding me 4.4 pounds boost per the data logging in the ECU. The turbo spools QUICK (of course i'm not pumping that much boost) and I could NOT get the sled to bog or sputter at large throttle stabs from idle. I believe that the ecu has such a fast processor that a well tuned map will provide the proper fuel required during a throttle stab. I was running MDS clutch weights at 73.3 grams with the 42-48 helix and was able to turn 8000 RPM.. Next time out I am going to tune the MAC valve and boost control to be able to spool the turbo faster and hold to 7 pounds of boost which I estimate will put me around 8400 rpm so I will add weight up to ~ 75 grams.
All in all, I'm really impressed with Bryce's attentiveness and willingness to help out... WOW. He lives and breathes this stuff....
If you are on the fence about the vipec... you will NOT be disappointed in the ECU nor Bryce's help/service.