STFT is dependant on fuel you use, add more e85 and STFT will go up. people add fueling/meth because hybrid turbos can give much more boost than stock -> stock fueling is not enough in n55/b58 case. required fueling is calculated not by boost (as air can be hot/cold) but by load (%) - it’s calculated value from boost, IAT, maf readings, etc. and yes for the same load will be same fueling no matter what turbo you use. and yes with the bigger turbo and same load engine will produce more power. PS2 has way bigger turbine wheel than stock N55, and it’s one of the factors why it gives 30-40 hp more than stock turbo with exactly the same tune without any extra fueling. but to use its full potential (1.6 bar 550hp) extra fuel will be needed for sure.
Quote:
Originally Posted by kern417
You do realize that hybrid turbos make more power because they flow more air, right? That's why people add meth/fuel pumps when upgrading turbos. You need more fuel to support the additional airflow.
Here's VTT's GC log.
https://datazap.me/u/vargasturbotech...og=0&data=4-19
Note the STFT. That's the easiest way to see what fueling is actually doing since we don't have an injection timing parameters to monitor. It's relative to the stock injection mapping. The DME can only adjust so much (typically up to +/- 30%) so while it can make more power, it's not safe. It is constantly compensating for varying fuel quality, ignition, etc. and operating near the limit reduces your safety net.
Also, hybrid turbos like pure and VTT add bigger compressors with the same size turbine housing. So you can actually increase back pressure. That's why a proper big turbo with appropriate A/R is more efficient. Hybrids are cheaper and flow more air than stock so you'll have more potential hp, but it sacrifices efficiency.
 |