Header and Supercharger Dyno Testing Comparison

Jennabear · November 24, 2014

We are getting ready for some more dyno test comparisons: Headers and supercharger

Test vehicle: 2013 6.2L.

Dyno: Mainline

Will be comparing Doug Thorley 1-5/8" to 1-7/8" with their 3" y pipe on both and then repeating the testing with a Magnacharger TVS1900 with 3.3" 3.0" pulleys.

Naturally aspirated testing will be performed on a detuned calibration to ensure that no fuel quality issues can interfere with results.

We will be able to directly compare the airflow changes between the two sets.

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desrtrat · November 24, 2014

are the headers CARB certified?

Jennabear · November 24, 2014

Currently CARB certified for 99-01.

desrtrat · November 25, 2014

thanks..

Jennabear · November 26, 2014

Preliminary results from yesterday were that both sets of headers have their place in a 6.2L. The 1-5/8" made more power than the 1-7/8" until around 4500rpm and the 1-7/8" pulled stronger to the shift point (and beyond). At 6000rpm, the 1-7/8" made nearly 10% more horsepower than the 1-5/8" set.

Blower testing had to be put on hold due to traction issues on the dyno (set up for front wheel drive) and we ran out of time to move the components around yesterday.

Jennabear · November 26, 2014

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.

gonzoid · November 28, 2014

would have expected 330hp range.surprised that much HP difference in tube size

kmborland · January 4, 2015

I wonder what a 1 3/4 pipe would do. Probably split the difference between these two. I would definitely give up some top end for low-mid range torque. More torque at a given rpm means more hp right, so the 1 5/8 has more power in the rpm I'll be driving in by the looks of the graph. Looking at headers myself for my 5.3

Also, what gear was this done in. Seems kind of low numbers for 6.2

Jennabear · January 5, 2015

Strap tension was biggest factor, due to roller issues. Numbers would typically be 40-50hp higher.

Jennabear · January 5, 2015

For your 5.3, between 1 5/8s and 1 7/8s would be best.

kmborland · January 5, 2015

Ok, was gonna say, that 6.2 is missing a cylinder or 2 lol.

I was talking to my tuner about torque cams and header size. He seem to be pushing 1 7/8 size. Saying that there wasn't a noticeable difference in power between 1 7/8 vs 1 3/4 size. You graph says that the smaller headers give more torque in lower rpms than the 1 7/8 does. Even though they both put down the same peak numbers. I am not looking for a race truck, looking for more power under the curve ha. So...am I on the right train of thought here on this? Don't plan on boosting, mild cam swap for torque gains (looking at something in the .5-.525 lift range, not sure on duration yet.), daily driver that gets flat footed at least twice a week.

Thanks for the help, sorry about changing subject. Figured it was a header thread, might as well ask about it.

Jennabear · January 6, 2015

It would be a pig off the line with 1 7/8s.

As for cam, duration plays a big role in where the power is made...

chucksrt · February 25, 2015

Wouldn't normal drive train deduct about 20% loss? So that being said it is only putting out 320hp at the flywheel? Sounds low for a 6.2 doesn't it?

vettelovralexand · February 25, 2015

Cool comparison. Justin told me the same thing when I was trying to figure out which size to purchase. Look forward to the blower comparison.

Jennabear · February 25, 2015

Wouldn't normal drive train deduct about 20% loss? So that being said it is only putting out 320hp at the flywheel? Sounds low for a 6.2 doesn't it?

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."