Vortech T-Trim vs Y-Trim
10-06-2013, 01:03 PM
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Vortech T-Trim vs Y-Trim
{Sorry for the length of this Thread}. I was searching the internet for a used YSI-trim to replace my T-trim and came across what was advertised as a "lightly used Vortech V-7 YSI-Trim Supercharger". I contacted the guy, made a "would-be" great deal, had him ship it, and when I received it, it was NOT a YSI, but a Y-Trim. The deal was made, the seller has the money, so I'll live with it (What's Done Is Done)
The only info that I found concerning the Y-trim was a feature in 2000 in a 5.0 Mustang article comparing the T-trim vs the Y-trim. **My question is**: Why doesn't a larger supercharger which has a larger compressor wheel NOT make more horsepower than a smaller supercharger with the SAME pulley combination??
Below is a copied portion of the article:
<<<<Swapping on the larger V-7 Y-Trim proved quite interesting. The larger blower fits the standard Vortech bracket with a bit of clearancing and promised a marked increase in airflow. Where the T-Trim is said to flow enough to support 825 hp, the Y-Trim is said to pump things up to the 1,000hp level (at the flywheel). To do so means spinning it, however.
Installing the largest 32-tooth cog pulley on the blower resulted in performance numbers much lower than those of the T-Trim with the same pulley. In fact, it was down from 64.9 lb-ft of torque to 572.2 lb-ft at 4,100 rpm. The trend continued with the horsepower numbers. Suffering a 27.3hp drop, the Y-Trim yielded peak horsepower of 573.8 at 6,600 rpm. These numbers show the T-Trim was working within its intended range, while the Y-Trim had to get warmed up.
Going with the 30-tooth cog pulley didn't bring the Y-Trim out of hibernation either. It pumped out 621.8 lb-ft of torque at 4,000 rpm and 609.7 hp at 6,700 rpm. These numbers were comparable with the T-Trim with the 32-tooth cog. Wearing the same 30-tooth pulleys, the T was still ahead by 82.1 lb-ft of torque and 10.4 hp. Adding the 28-tooth cog to the Y-Trim widened the torque gap between the blowers to 108 lb-ft of torque and closed the horsepower gap to 2.7, but the 28-toothed T-Trim was running out of breath. The Y was just starting to hit its stride with 659.3 lb-ft of torque and 639.5 hp.
The next step was taking the Y-Trim where the T feared to spin--the 27-tooth cog pulley. This is the smallest blower cog pulley offered by Vortech so it was now or never for the Y-Trim. Bolting on the diminutive pulley showed the true nature of the high-winding Y-Trim. It cranked out 714.2 lb-ft of torque and 667.6 hp. Torque production still paled by 53.1 lb-ft, but horsepower continued to grow. The Y-Trim surpassed the T at 5,900 rpm and pulled strongly all the way to 7,000 rpm where it posted 667.6 hp; 25.4 better than the T's best. Of course, Anderson had pulled the pin on his A4 block and spun the motor to 7,000 to compensate for the lack of a smaller cog pulley. Clearly, the Y-Trim wanted more rpm.>>>>
Again, why doesn't a larger compressor wheel that is spinning the same RPM's as a smaller one make more horsepower?? THANKS
The only info that I found concerning the Y-trim was a feature in 2000 in a 5.0 Mustang article comparing the T-trim vs the Y-trim. **My question is**: Why doesn't a larger supercharger which has a larger compressor wheel NOT make more horsepower than a smaller supercharger with the SAME pulley combination??
Below is a copied portion of the article:
<<<<Swapping on the larger V-7 Y-Trim proved quite interesting. The larger blower fits the standard Vortech bracket with a bit of clearancing and promised a marked increase in airflow. Where the T-Trim is said to flow enough to support 825 hp, the Y-Trim is said to pump things up to the 1,000hp level (at the flywheel). To do so means spinning it, however.
Installing the largest 32-tooth cog pulley on the blower resulted in performance numbers much lower than those of the T-Trim with the same pulley. In fact, it was down from 64.9 lb-ft of torque to 572.2 lb-ft at 4,100 rpm. The trend continued with the horsepower numbers. Suffering a 27.3hp drop, the Y-Trim yielded peak horsepower of 573.8 at 6,600 rpm. These numbers show the T-Trim was working within its intended range, while the Y-Trim had to get warmed up.
Going with the 30-tooth cog pulley didn't bring the Y-Trim out of hibernation either. It pumped out 621.8 lb-ft of torque at 4,000 rpm and 609.7 hp at 6,700 rpm. These numbers were comparable with the T-Trim with the 32-tooth cog. Wearing the same 30-tooth pulleys, the T was still ahead by 82.1 lb-ft of torque and 10.4 hp. Adding the 28-tooth cog to the Y-Trim widened the torque gap between the blowers to 108 lb-ft of torque and closed the horsepower gap to 2.7, but the 28-toothed T-Trim was running out of breath. The Y was just starting to hit its stride with 659.3 lb-ft of torque and 639.5 hp.
The next step was taking the Y-Trim where the T feared to spin--the 27-tooth cog pulley. This is the smallest blower cog pulley offered by Vortech so it was now or never for the Y-Trim. Bolting on the diminutive pulley showed the true nature of the high-winding Y-Trim. It cranked out 714.2 lb-ft of torque and 667.6 hp. Torque production still paled by 53.1 lb-ft, but horsepower continued to grow. The Y-Trim surpassed the T at 5,900 rpm and pulled strongly all the way to 7,000 rpm where it posted 667.6 hp; 25.4 better than the T's best. Of course, Anderson had pulled the pin on his A4 block and spun the motor to 7,000 to compensate for the lack of a smaller cog pulley. Clearly, the Y-Trim wanted more rpm.>>>>
Again, why doesn't a larger compressor wheel that is spinning the same RPM's as a smaller one make more horsepower?? THANKS
Last edited by shosovr; 10-06-2013 at 03:14 PM.
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