[ta man]

For anyone who has ran at the dragstrip or or at the dyno. Has anyone ran open headers and extensions vs headers and a x piipe and no mufflers.
In the never ending need for hp I'm planning on trying both at the dragstrip..this will aid with the final (maybe) exhaust setup and position of cutouts.

[turbo69bird]

I’ll be interested to see what your testing shows . I predict there won’t me much difference but just a guess on my part.

Are you gonna do back to back testing? Hard part is even through the day a car can get faster or slower heat soak wind changes, temperature. Lots of variables. Which makes small changes in ET hard to attach to a certain change. Almost need to make the change the. Make the change back to be sure .

[ta man]

Originally Posted by turbo69bird

I’ll be interested to see what your testing shows . I predict there won’t me much difference but just a guess on my part.

Are you gonna do back to back testing? Hard part is even through the day a car can get faster or slower heat soak wind changes, temperature. Lots of variables. Which makes small changes in ET hard to attach to a certain change. Almost need to make the change the. Make the change back to be sure .

Just tryin to figure out what is quickest..and how much slower is it quiet

[Goatracer1]

What type and size pipe are you going to run? If you run a 3" mandrel bent pipe you will have to have a car that makes very repeatable runs to see a difference.

[ta man]

Originally Posted by Goatracer1

What type and size pipe are you going to run? If you run a 3" mandrel bent pipe you will have to have a car that makes very repeatable runs to see a difference.

3 inch
With good track prep I'm within a few hundred each run..I'm really after anything noticeable..
If the theory behind x pipes is valid the x pipe with no muffler should be quickest compared to header extensions.. I will also factor in weight
My first time out with open headers and extensions was fun..but is it quicker then an x pipe? Or how much slower with mufflers?

[Skip Fix]

My 78 TA with the old roller motor ran the same in the 1/8 with open headers not exhaust system weight as it did with 3"X into 3" Ultraflows and Torque tech 3" tailpipes. 6.90s @99-100 in good air even with the extra weight. Southern Nationals was at an 1/8 mile track that year.

[ta man]

Originally Posted by Skip Fix

My 78 TA with the old roller motor ran the same in the 1/8 with open headers not exhaust system weight as it did with 3"X into 3" Ultraflows and Torque tech 3" tailpipes. 6.90s @99-100 in good air even with the extra weight. Southern Nationals was at an 1/8 mile track that year.

Thanks Skip..I know I'd sooner run full exhaust at the track and be the quiet car that surprises the other car.

[Skip Fix]

Originally Posted by ta man

Thanks Skip..I know I'd sooner run full exhaust at the track and be the quiet car that surprises the other car.

Yep especially those open header BBC cars

[ta man]

Originally Posted by Skip Fix

Yep especially those open header BBC cars

LOL yes..when mine is working right, it is pretty cool when I can hole shot the open headered bracket racers with slicks.

[Skip Fix]

Then they come over looking for the spray plate

[ta man]

Originally Posted by Skip Fix

Then they come over looking for the spray plate

Andy and I hear that at least once a track visit. lol

[Formulajones]

Yes, we run electric cutouts on about every car here.

Some are configured differently so results change. Some of them I have the cutouts about 18-20 inches back from the header collectors and some of them I have the cutouts after the X-pipe, such as how Pypes configures their system.

These systems also vary from 2 1/2" mandrel bent, to 3" mandrel bent, and one is 3 1/2" off the headers to a Dr. Gas X that exits with 3".

Almost every car here uses Dynomax Ultraflows with a couple exceptions being Pypes Race Pro (which is basically the same thing) or in Dad's case a race style muffler with nothing inside of it. Cutouts have been worth a pinch of ET, mainly MPH.

Heading to the chassis dyno in about a month with 2 of the cars and plan to test with and without cutouts open just to get an actual measured number.

[ta man]

Thanks, be sure to post the results.
I find it interesting to always see the results first hand.

[Formulajones]

As an example, here is how I have one of them configured.

[Formulajones]

Crap let me try that again.....

[Formulajones]

Ooops first one didn't show up for me so duplicate post.

[Formulajones]

Originally Posted by ta man

Thanks, be sure to post the results.
I find it interesting to always see the results first hand.

I may start a new post about it. Even though the dragstrip they have proved beneficial it's always in question for one reason or another even though the passes are made back to back and the cars are pretty consistent.

So I figure a chassis dyno leaves no doubt, I can run back to back, flip the switch and not even shut the car off, make another run, compare the dyno sheets.

[highway star]

Ran open headers. Ran Purple Hornies, sound was only difference. 7.8 1/8th. Love open, just sounds nasty in a good way

[ta man]

Originally Posted by highway star

Ran open headers. Ran Purple Hornies, sound was only difference. 7.8 1/8th. Love open, just sounds nasty in a good way

Awesome, I'm at 6.8/6.9's..So be interesting..did you have extensions? Or were the Purple Hornies attached to the headers?

[highway star]

Hornies attatched to headers.