TAG ?? Anybody know about this ??

[illflem]

I'm stoked

Dave (car-nut) sent me a new TAG to try out, it works!

I had tested the previous design and wasn't impressed but the new one sure does.

I've only driven empty about 600 miles with it but my cruising boost @ 75 mph is down 2 psi and egts down about 75. Crossing the continental divide today at 75 mph my egts were 1000, they normally run about 1150 on that hill.

Turbo whine is way down, if you're the kind of guy who likes to remove the silencer ring forget it. Mpgs were about the same. Seems to spool up faster also.

True test will be towing 15k with it next week.

Thanks Dave!

 

[rweis]

Car_nut57,



Yep understand the CNC "tweeking", and Bill's comments really support your idea.



I have one of Kurt Yardley's KSB1B's. I'll call Kurt and see if he has exact ID of the compressor inlet. If not I'll get a machine shop to take measurements. Now where do you typically mount the TAG?



The B1B has a 3 legged web just beofre the compressor wheel. That might be too far down the throat. The pics I have seen so far it is mounted inside the throat right at the outer rim of the throat toward the rubber air duct. Would I have it machined down to fit the ID of the throat then add a support ring to the air duct side of th TAG so the ring holds the TAG from slipping further down into the compressor throat?



How do I contact you to discuss this?



I also have a Scotty II right now in the hush mode, but the cowl opening is cut with the Scotty II cowl end covered over. This will be an easy pre TAG / post TAG with and without the cowl opening compressor whine experiment.



I flew a centrifugal compressor aircraft in the USAF for a while and am very familiar as to the centrifugal compressors whine.



Let me know how to contact you,



Bob Weis

 

[Car_nut57]

Bob Weis,



Just give me a call toll free to discuss the options with your turbo. I have a full CNC machine shop here and we can help. Our number is 1-866-379-8685.

 

[jponder]

What is "Laminar" air flow? what does laminar mean?

 

[Sregorb]

Excellent! Just talked to Dave, and count me in as a tester. I'll be headed to the dyno soon to baseline stock and stock + TAG once it arrives. I'll let you all know when I know!

It also sounds like the final product (expect Nov/Dec) will be great (form and fit) as described with a welded metal ring perimeter.

I'll have to warm up the article-writing skills again and provide something for the magazine. Good or bad, SOTP or stats, I'll report back.



Brian



ps. jponder- Think in application of air vice fluid.



Definition: [n] nonturbulent streamline flow in parallel layers (laminae)

See Also: streamline flow



Biology Dictionary

Definition: The type of flow in a stream of water in which each particle moves in a direction parallel to every particle.

 

[Car_nut57]

Re: Dyno Testing

Originally posted by crawler

We're having a dyno event in the next month or so and I'm sure we would have all sorts of motor combos with willing drivers. Send us 1 or 2 to Dallas. We'll test them out for you.

I have sent out every piece of TAG material I had for testing and won't have more material for about 3-weeks.

 

[shendren]

my master's in mechanical engineering from standford university was in fluid mechanics. the guy's description is weak. the noise may be reduced by straightening out the flow.

 

[rbattelle]

shendren,



While I agree with you that the extraordinary "seat of the pants" improvement some have reported might be a bit overstated, I am fully on board with this TAG concept. Notice that wind tunnels use exactly the same "soda straw" mesh at their intakes. Granted, these are mounted far upstream of the test section so that the flow is fully developed in time. I had suggested to Car_nut that they move the TAG further upstream to ensure the impeller is seeing fully-developed laminar flow (as opposed to a series of jets issuing from the honeycomb), and they've done that (with positive effects). Personally, I'd prefer to see it even further upstream, say 5-9 inlet-diameters, but I think it has great benefit even where it is now. Remember, impellers are designed under the assumption that the air entering them is laminar and 90 degrees to the face... unlikely to be the case without a TAG-like device in that intake tube.



With a masters degree in fluid mechanics I am puzzled why you can't see the potential benefits of this device. BTW, it's "Stanford", not "Standford". And why, exactly, would "straightening" the flow reduce compressor noise?

 

[shendren]

sorry about the misspelling. i didn't say that i couldn't see any benefits. i just said that his/her description was weak... ...

 

[rbattelle]

shrenden,



No problem, I was just being a smarta$$. When did you get your graduate degree? What was the title of your thesis? I'm just curious.

 

[shendren]

1994,

master's program is a one year program at stanford. no thesis required.

 

[Mundgyver]

Car_nut57,



I received the TAG on Saturday. I was at the coast with my wife and another couple doing a vacation thing.



I installed it tonight and it appears that the throttle response is better. This is a subjective thing though. I have removed it for now as I need to re-baseline my truck. Rip Rook installed a 4 inch exhaust system with a SS resonator tip for me on Friday and I need to let my excitement settle down from this and the ATS manifold installed the week before and get my base numbers for mpg and performance re-figured. This will take me about a week. Once that is done then I will focus on getting you a couple of pages of definitive numbers based on my trucks configuration and my style of driving. Oo. Oo.

 

[jwinnie]

Could someone post a picture of one before installation? That looks like a piece of 1/8 or 3/16 cell aluminum honeycomb core that we use at my work every day. The stuff is a little pricey but we throw away pieces alot bigger than that. I could make one in about 5 minutes for cheap$$



I doubt they would send me specs on the alloy and cell wall thickness though.



John

 

[illflem]

There's a drawing on their website http://www.dieselpowerproducts.com/tag



It's stainless, not aluminum, proper length is very imporant.

 

[illflem]

Bad aspect of TAG

Is taking it out to try on another truck, I missed it instantly!

It was a night and day difference for me noticed mostly when it was gone. I liken not having the TAG installed to driving with a cold engine on a 25° day, sluggish and noisier as compared to the TAG installed. For some reason it seems to be reducing more than just the turbo noise, seems to take some of the rattle out also. Almost seemed like something was wrong with my truck without it.

I want it back in. Towing results next week.

 

[Car_nut57]

Test numbers for the TAG

Finally got some test numbers on the website for dyno and emissions http://www.dieselpowerproducts.com/tag



The emissions results are truly impressive and a good indication that the TAG is having more effect than just that which appears on dyno runs. Many with pre-2003 trucks are reporting visible reductions of smoke and improved fuel economy while towing. Also most say their engines run smoother and quieter using the TAG.



More testing to come.

 

[moparguy]

That's just great. Another gottahaveit.



Sounds like I need to get in line, would sure like to have one for the trip to the Rockies in a few weeks.



RJR