lack of tri y headers
Jan 4, 2011 | 08:14 PM
#31
Dyno Info ......for high rpm race engines is a whole different subject .where you can discuss stepped design , merge collectors etcetc ........lots of Dyno info out there ask any racer ...... I have spent alot of time on the dyno with my drag race engine just changing out collectors sizing/ style ......and yes stepped headers too .store bot headers you wont find dyno info cause they all built as a compromise for fit and ease of install and cost
Jan 4, 2011 | 08:39 PM
#32
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From: In a van DOWN BY THE RIVER
I am talking about on out trucks. Some dyno papers.. I am not trying to start a huge pissing match here. But you would figure if they work as well as some people say they do their would be more company's making them then there is know?? As far as store bought headers I have do disagree some, all the standard and stepped style headers you can get dyno info for them on our trucks.. 
If your looking to keep tq down low a smaller prime header will do just that, still allow enough for top end gains..
If your looking to keep tq down low a smaller prime header will do just that, still allow enough for top end gains..
Jan 4, 2011 | 09:40 PM
#33
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From: Sulphur Springs,Tx
They say that cost and time play a big roll in making tri y headers. But you do have a point about dyno graphs not being readily available with tri y. Not sure why that is maybe since most of our aftermarket started with the car performance trend and carried most of it over to trucks. Guess I really dont know tho. But still wouldnt a smaller tube still end up choking up top on a 4-1 header?
Jan 5, 2011 | 01:38 PM
#34
I agee a flat torque curve is what you want but these stock to mild 5.3 dont have a flat torque curve with only 325ci so you want to move the torque peak down low to get the mass moving ........ and small diameter primary tube tri Y will do that better than a 4 tube thats all I'm saying ......... its all about exhaust velocity .for a street truck I will give up some torque at 4500 to have more off idle to 3000 where most of us drive .........if your building a drag race deal then its a different deal .....ti Y headers are a good design for small motors in heavy cars .......big inch high rpm motrs dont need tri Y ......they can use differnt sized collectors to tune the torque band
Yes agree withthe Burns web site but you cant compare a quality $$$ header like Burns to the street design Thorleys, Thorleys wont pull all the way thru to redline and be equal to a 4 tube and were not designed to ........ Burns stuff is tuned to the engine rpm band you build the motor for
Yes agree withthe Burns web site but you cant compare a quality $$$ header like Burns to the street design Thorleys, Thorleys wont pull all the way thru to redline and be equal to a 4 tube and were not designed to ........ Burns stuff is tuned to the engine rpm band you build the motor for
Jan 7, 2011 | 06:04 AM
#36
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From: Sulphur Springs,Tx
yea a saw the extension deal in a magazine a while back 18 was the magic number for the big block they were using but i would assume every motor is different and plus on the street you run exhaust out anyways
Jan 7, 2011 | 05:35 PM
#37
You are correct sir, on the street one should run the exhaust out. However, while every engine is different, the principle is still the same. By adding a collector extension you are tuning the exhaust. 18" extentions may not be right for everyone, but you can go longer or shorter to tune it. What you have to keep in mind is that after the collector ends, so ends the smooth portion of the flow. Even smooth bent pipes are going to cause turbulance and back pressure. The extensions will just delay that issue for an extra foot or so allowing smoother flow, hence more power. As far as why not every manufacturer is making Tri-y's, well a lot of it is due to the cost and time. They're a complete pain in the butt to produce, but what you get is theoretically a more even and smooth exhaust transition which in theory should make more power even under the curve.
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