Attention: TDR Forum Junkies I received my TAG and smooth tube today. I know this item has been debated before but the results of my tests are interesting.
The truck in question is in my sig with no engine mods other than a cat-back and vertical baffles removed from the silencer and 2500 miles on the clock.
Since I also ordered the smooth tube from DPP, the TAG was preinstalled in the hose. I had a concern, having only seen pictures of it, that the honeycomb would create a restriction. After all, you are essentially placing "stuff" in the air flow path to the turbo inlet. After seeing it up close, I still had that concern, solely because I felt (based on experience with aviation applications) that maybe they shouldn't have used such small honeycomb cells.
Either way, I installed the unit in about 5 minutes and took it for a ride. I didn't expect to feel any power increases or anytihng else for that matter since I'm not adding any fuel to the picture yet. Turbo noise was about the same as before with no noticeable increase. What I did notice was a slight increase in throttle response and slight reduction in turbo lag... nothing worth getting all fluffy over.
My only real expectation would hopefully be met after parking it. Before the test, I pulled the filter change indicator and tested it with a vacuum pump to see what it took to take it into the red (1. 5 inches merc. ), and to see what it took to get it 1/4 into the green (where it resided before the TAG). In it's usual spot, it took . 25 inches of mercury vacuum to pull the indicator to the original mark. After the TAG I noticed that the indicator was halfway through the green... roughly double the vacuum @ . 5 inches of mercury.
Increasing the vacuum between the filter and turbo inlet can mean only one thing... the turbo compressor draws in more air when breathing through a TAG. (the addition of the smooth tube could not have affected the results since both tests used the factory airbox and filter) I swapped back to stock to verify my findings and repeated the test... results were the same... less vacuum without the tag, 50% more with it. My vacuum pump isn't exactly "space shuttle" quality but it's a decent Craftsman that's pretty accurate.
What does it mean? If that's your only mod, obviously lower EGT's will result and not much else. If your adding fuel as well, the benefits are self explanatory.
The truck in question is in my sig with no engine mods other than a cat-back and vertical baffles removed from the silencer and 2500 miles on the clock.
Since I also ordered the smooth tube from DPP, the TAG was preinstalled in the hose. I had a concern, having only seen pictures of it, that the honeycomb would create a restriction. After all, you are essentially placing "stuff" in the air flow path to the turbo inlet. After seeing it up close, I still had that concern, solely because I felt (based on experience with aviation applications) that maybe they shouldn't have used such small honeycomb cells.
Either way, I installed the unit in about 5 minutes and took it for a ride. I didn't expect to feel any power increases or anytihng else for that matter since I'm not adding any fuel to the picture yet. Turbo noise was about the same as before with no noticeable increase. What I did notice was a slight increase in throttle response and slight reduction in turbo lag... nothing worth getting all fluffy over.
My only real expectation would hopefully be met after parking it. Before the test, I pulled the filter change indicator and tested it with a vacuum pump to see what it took to take it into the red (1. 5 inches merc. ), and to see what it took to get it 1/4 into the green (where it resided before the TAG). In it's usual spot, it took . 25 inches of mercury vacuum to pull the indicator to the original mark. After the TAG I noticed that the indicator was halfway through the green... roughly double the vacuum @ . 5 inches of mercury.
Increasing the vacuum between the filter and turbo inlet can mean only one thing... the turbo compressor draws in more air when breathing through a TAG. (the addition of the smooth tube could not have affected the results since both tests used the factory airbox and filter) I swapped back to stock to verify my findings and repeated the test... results were the same... less vacuum without the tag, 50% more with it. My vacuum pump isn't exactly "space shuttle" quality but it's a decent Craftsman that's pretty accurate.
What does it mean? If that's your only mod, obviously lower EGT's will result and not much else. If your adding fuel as well, the benefits are self explanatory.
