Header and Supercharger Dyno Testing Comparison

[chucksrt]

It is low, as explained in an earlier post: " Here is the resulting dyno graph comparing the two headers on an otherwise stock 6.2L. Pay attention to the percentage differential between the two, rather than the absolute power numbers. The same truck strapped down to the dyno differently with a slightly more aggressive tune puts out 50hp more. Blue run is the 1-5/8" and red is 1-7/8". Both are utilizing DT's 3" stainless steel y-pipe. Both runs had coolant temp of 192*F at the start and intake temps of 102*F for an even comparison."

rven adding 50hp plus 20% for drivetrajn loss still only puts the hp at 370 at t he flywheel. And your saying that number is with a tune. If these numbers are correct ghen gm really i nflated the hp numbers. I have not been able to find any other real world dyno info others than what you have posted to compare it with. I will be trying to have my 07 yukon dyno'd some time in the near future for a baseline and for a comparison to other peoples dyno numbers. Just need to find an awd dyno near me. The 1 5/8" headers look like the way to go if you would like to retain normal operating mpg. Thanks for the write up!!!

[Jennabear]

Realistic drivetrain loss (on anything other than a DynoJet, which inflates their numbers) is higher than 20%. On this particular dyno an associate tuned an engine on an engine dyno and then swapped the engine into a race chassis and the loss was 35%.

 

The simplest things, such as strap tension, can have a major impact on numbers. In this case the truck was strapped down as right as possible to try to keep the wheels on the rear roller.

[tatsslp]

Any update on the supercharger testing?

[iCryWheniGoPoop]

Have you ever done a comparison between DT's and say Kooks or ARH's? This is why I ask.... I had 1 instance where we had a heavily Cammed 5.3 that seemed to run just as well on stock manifolds as it did DT's, we eventually changed to kooks and never looked back. I know this was just one instance and may have been a fluke but had you whitenessed the amount of time spent on this truck tuning it to try to find the issue, you would feel the same way. I had always just assumed the the Tri Y design didn't work as well on the new firing order of the LS based motors but I have never bought another set of DT's since and always just steered people away from them base on my 1 time bad experience with them. With that being said, I absolutely loved them on pre LS.

[Jennabear]

Probably won't get around to doing the supercharger test anytime soon, but eventually.

 

Never done an experiment between header brands, too expensive and time consuming. We have run AEM LTs, Bassani midlengths, Dynatechs, DTs, and Stainless Works (not to mention many customers with other name brand headers). There are some brands we would stay away from for sure, but the DTs have performed just as good as some of the more expensive brands.