Attention: TDR Forum Junkies Let me start by saying, I have no affiliation with DPP and TAG.
I recently installed BD's super "B" twins on my 2003 HO 6 speed. I was not happy with the significant turbo whine coming from my engine compartment. I realize this is crazy talk in bomber circles but I was looking for cooler temps not cool noise.
After finding out that Borg Warner doesn't make a silencer ring for my Switzer turbo's I started investigating other options. A search on TDR led me to the TAG, (Turbo Air Guide). Members have reported a significant drop in turbo whine after installation.
I contacted Diesel Power Products to learn more. I talked Dave Meheen and explained my situation. He was very helpful and said the TAG III was my best option. He said they've done little testing on twins and wanted to gather more data. He offered to send me 2 for the price of one if I would provide him some feedback. I've completed my testing and thought I would share the results on here.
I installed the TAGs in 3 different locations and tried to objectively rate noise level, performance changes and boost and pyrometer readings.
1st test:I put a single TAG at the air filter. I noticed at least a 50% drop in turbo noise. No obvious change in performance and no change in the gages.
2nd test: I put a single TAG in the intake tube right in front of the primary turbo. There I noticed a different pitch in the turbo whine and atleast a 50% drop in volume over no TAG at all. Performance wise, hard to tell. Not a significant difference. It may have felt a little more responsive. The Pyrometer was cooler by atleast 50 degrees on average. The boost seemed to build a little faster.
3rd test: I put the second TAG back in at the air filter. This time atleast another 20% drop in volume (70% or more overall drop in volume). Performance and gages unchanged from the last test.
4th test: I removed the TAG from the filter and installed it ahead of the secondary turbo. The results were unchanged from the 2nd test.
I'm now running it in configuration #3. I don't know how running 2 TAG's will effect my performance when I'm towing heavy. It takes less than 5 minutes to remove the TAG from the filter. For now, running both provides a nice sound and no performance sacrifice while driving empty.
I recently installed BD's super "B" twins on my 2003 HO 6 speed. I was not happy with the significant turbo whine coming from my engine compartment. I realize this is crazy talk in bomber circles but I was looking for cooler temps not cool noise.
After finding out that Borg Warner doesn't make a silencer ring for my Switzer turbo's I started investigating other options. A search on TDR led me to the TAG, (Turbo Air Guide). Members have reported a significant drop in turbo whine after installation.
I contacted Diesel Power Products to learn more. I talked Dave Meheen and explained my situation. He was very helpful and said the TAG III was my best option. He said they've done little testing on twins and wanted to gather more data. He offered to send me 2 for the price of one if I would provide him some feedback. I've completed my testing and thought I would share the results on here.
I installed the TAGs in 3 different locations and tried to objectively rate noise level, performance changes and boost and pyrometer readings.
1st test:I put a single TAG at the air filter. I noticed at least a 50% drop in turbo noise. No obvious change in performance and no change in the gages.
2nd test: I put a single TAG in the intake tube right in front of the primary turbo. There I noticed a different pitch in the turbo whine and atleast a 50% drop in volume over no TAG at all. Performance wise, hard to tell. Not a significant difference. It may have felt a little more responsive. The Pyrometer was cooler by atleast 50 degrees on average. The boost seemed to build a little faster.
3rd test: I put the second TAG back in at the air filter. This time atleast another 20% drop in volume (70% or more overall drop in volume). Performance and gages unchanged from the last test.
4th test: I removed the TAG from the filter and installed it ahead of the secondary turbo. The results were unchanged from the 2nd test.
I'm now running it in configuration #3. I don't know how running 2 TAG's will effect my performance when I'm towing heavy. It takes less than 5 minutes to remove the TAG from the filter. For now, running both provides a nice sound and no performance sacrifice while driving empty.
