Had some fun with a set of BETA VTT Stage 2 turbos on Wednesday night and here are the numbers. The tune is running 21psi peak down low, 20psi at 6k rpm, 19psi at 6200rpm, 18psi at 6500rpm, 16.6psi at redline. Timing is in the range of 10.5 to 11.5deg peak without any hint of timing corrections all the way through.
This was on pump 94 octane from Petro Canada (formerly Sunoco) running the Aquamist HFS-4 setup with two 1mm nozzles and 100% meth. According to short term trims the DME is pulling out 25% through trims with two 1mm nozzles so we could probably dial it in a bit better by dropping one of the two 1mm nozzles to a 0.9 or a .8mm instead.
Numbers look really nice and the most this car has ever made on pump and meth so far with this much timing and boost. Boost wise there isn’t any more to be had up top but we expect there’s possibly another 2-3 degrees left in there on race gas.
Design wise these turbos should be close to what the next Stage 2 Batch 2 setups end up looking like from Vargas Turbo Technologies. The actual Stage 2 Batch 2 dyno numbers will be published with our tuning once they’re ready and installed for testing on the the new VTT shop test car.