TAG- Dyno Results and Bench Flow Testing

[KEarnest]

Dave Meheen asked me to try out a new TAG-III and I jumped at the chance. I just got it installed a few minutes ago and haven't had a chance to try it out yet. I'll post back again after I get a chance to try it out. I posted some pictures in my gallery



TAG-III Pictures

 

[Cooker]

Does the TAG-III have a fatter honeycomb than the TAG-I? Or it is the "housing" the only difference between the I and III?

 

[KEarnest]

Cooker, I should've taken a picture of the back side of the TAG-III to better show the honeycomb. Sorry about that. The honeycomb portion of the TAG-III looks to me to be ~ the same size as the TAG and TAG-II. Dave Meheen could answer that for sure.



Last night, I got a chance to try out the TAG-III and the increase in spool-up is incredible. Keep in mind, I have a 4x4 2500 with 3. 55 gears, 33" tires, 5sp and a PDR HX-40/16. Even with DD2's, I have some lag. Well, the TAG-III makes me feel like I've got my HX-35/12 back. Anyone with a 5sp knows there's a pretty big gap between 3rd and 4th gears, and you can really feel the lag at that shift point with an HX-40. The TAG-III spools the turbo so quick now between 3rd and 4th that the lag is GONE. I can't wait to try it out while towing.

 

[cap-n-cray]

Does the TAG III fit the AFE air filter (mega cannon) set up better than the TAG I? I have a TAG I, but have only tried it on a stock set up. I am not sure if the TAG I will fit the AFE set up. What is the best set up for the AFE Mega Cannon?



Cary

 

[RWood]

"The interesting thing we noticed on this truck was with the installation of the TAG-III under deceleration the turbo makes 3-4psi boost. "



I notice that my pickup has 4-5 psi of boost when going down a hill at no throttle. Would this be the same as the results found on the thrid generation truck?

 

[Car_nut57]

4-5psi boost under no throttle deceleration is very impressive. Have you noticed other differences with boost levels, EGTs mileage etc. ?

 

[RWood]

To be honest I don't know if this is caused by the TAG. but I will take it out and find out. I have seen a increase in maximum boost and a drop on the freeway.



Is the boost at deceleration a good thing?

 

[Graphic man]

Thats good info!!

Thanks for taking the time to post it !!!!!



Scott

 

[Car_nut57]

To be honest I don't know if this is caused by the TAG. but I will take it out and find out. I have seen a increase in maximum boost and a drop on the freeway.



Is the boost at deceleration a good thing?

The lower boost to keep the truck moving down the road and higher peak boost are both good things and show that the TAG-III is having a positive effect.



The boost producing under deceleration is interesting because it indicates that the TAG-III is getting enough more air into the turbo effeciently enough to make pressure under those conditions. On the 2003 truck I saw this on the first time, I initially thought the gauge was bad, so we tried another gauge with the same results. Then removed the TAG-III from the truck and under the same conditions, no boost pressure registered. Put the TAG-III back in and boost pressure returned under no throttle slowing conditions.

 

[TradedV-10foraCummins]

So which one do you suggest for the 94-02 trucks? It sounds like the Tag III is giving better results on the 2nd Gens (compared to the Tag II) even though it is really for the 3rd Gens. Also will the TAG III be less likely to have fitment issues with aftermarket turbos?

 

[Car_nut57]

Good question. As for fitment with aftermarket turbos, B1, HX-40 etc. , the TAG-III is designed to fit most of these with no modifications. The TAG-III also fits directly into the aFe torque tube for the 3rd gen trucks which the standard TAG did not. As for the performance comparing the TAG-II to the TAG-III, that is very difficult as the TAG-III is so new. So far on the after market turbos and trucks with injectors, boxes etc. , the TAG-III does seem to be providing the best benefits and costs a little less than the TAG-II. So I think the one to get for most applications would be the TAG-III.

 

[Cooker]

Is the TAG I no longer available? or is it getting phased out?

 

[RWood]

I guess I didn't say, but I have the original TAG.

 

[Car_nut57]

Is the TAG I no longer available? or is it getting phased out?

Currently we have no plans to phase out the TAG I or TAG II. Many still buy both of these. The TAG-III was developed to get the most benefit for the 3rd gen trucks and also to accomidate the many different after market turbos and air intake systems.

 

[John]

Dave Meheen asked me to try out a new TAG-III and I jumped at the chance.

Kent, before you installed the TAG-III which TAG did you have installed (TAG-I or TAG-II)?



If the TAG-I, have you tried the TAG-II?



I am very interested in your acquired knowledge on this as I personally know you and very much respect your input.



TIA John

 

[Car_nut57]

Well at this point its hard to give a recommendation between the two. We have a lot more second gen owners with experience with the TAG-II than we do the TAG-III. However in the few reports we have gotten back from 2nd gen owners the TAG-III has seemed to perform a little better especially in aftermarket turbos such as the HX-40 KErnest tried. Either one is an improvement over the original TAGs performance. I guess I would lean towards the TAG-III given the feed back we have gotten especially if I had an aftermarket turbo.

 

[John]

Thanks for the response Dave.





Kent... are you out there anywhere? What about any opinions you may have regarding my questions in my last post????

 

[Greg Boardman-RIP]

Can you let us know again what the benifits of the tag III are?

 

[Car_nut57]

So which one do you suggest for the 94-02 trucks? It sounds like the Tag III is giving better results on the 2nd Gens (compared to the Tag II) even though it is really for the 3rd Gens. Also will the TAG III be less likely to have fitment issues with aftermarket turbos?

Yes it seems the TAG-III is just a little better across the board than the TAG-II, but will spool slightly slower than the TAG-II does. The TAG-II generally is the best performance in the off idle through the mid rpms and the TAG-III is not quite as fast to spool up as the TAG-II just off idle, but provides more to higher rpms. You are also correct that the TAG-III is intended to be used with the majority of aftermarket turbos.

 

[KEarnest]

Well, I'm back after having the truck down for over 2 weeks with a failed oil pressure sending unit. I ordered the wrong part from NAPA, P/N op-6189 which BTW is for a 12-Valve. I finally received the correct part, Cummins P/N 4088390 and installed it Saturday and went for a spin. This was only the 3rd time I've got to drive the truck with the TAG-III and man alive, spool-up is rediculously fast on my PDR40. I drove around for a while with the PM3 off, then I turned the PM3 on and set it to level 3 on the remote and just about scared myself silly crossing the mountain.



Greg, the benefits that I have from the TAG-III are way-increased spool-up, lower EGT's, less smoke and reduced cool-down times. I've gotten increased mpg's from both the TAG-I and the TAG-II and I'm waiting to see how the fuel mileage compares with the TAG-III. A very cool thing I have noticed is an increase in boost pressure while under light throttle conditions and I'm still able to max out at the same psi on WOT conditions as before the TAG-III. Check my sig for truck mods.