Thread: tri -y headers

So hard to compare a motor developed for drag racing vs one developed for road racing. So many different and sometimes conflicting design goals at play. I as someone more focused on road racing I love that fat 2000+ rpm powerband above 220hp even if peak is only 230's. .Really excited at some of the recent results I am seeing.

There are 2.0L's floating around making that power. One which will be in the 270-280whp (315-320bhp) range below 13:1 compression in the coming weeks.

With the mild cam profiles we have available and the use of VVL, there are certain aspects that do not respond the same as that of the single cam profile BTCC engine.

Again you have to look at all aspects before drawing conclusions: Cam profile/intake length/header length/rod-stroke ratio.

I also have to disagree with the 4-1 coming into its own after 8500rpm. I have many tests done to prove that assumption wrong. There is a huge test underway which I hope will put to rest some of these assumptions floating around.

Exactly what happy said. So you guys think because such and such touring cars used a tri y that they are superior. .. I think not. Its all about what the goal is. Of course a road race car would benefit more from a broad powerband with good low end tq but not a drag car. 4-1 headers can be dialed in to improve power at a specific point and have stronger pulses. The 4-2-1 design can not capitalize as much in one specific rpm but does a better job sometimes of producing a better more even power band

With all do respect this thread was focused on tri y headers for drag racing,Not motorsports. We build our motors for different applications. Bttc were built for endurance, we build our motors for drag racing, mostly straight line. I for one could care less about circuit or roadcoarse, and we do have a few 2.0s with off the shelf parts making over 260whp on a dyno dynamic with off the shelf parts on pump gas. Everyone knows that is not a very forging dynometer.
So back to the topic about tri y vs 4-1, I think it depends on preference, we have countless hours of dyno time testing headers of all kinds and combinations. I for one prefer a properly built 4-1 over all cuase I live we live around 10k rps ALOT....

whats a header? dont see all this bickering about slapping a snail on and letting that bitch scream

Meathead mentality... lol

How many guys here have built motors and have results? I see a lot of people posting about different setup and such but from everything that has been posted, i can honestly count maybe 3 people here who have built anything worth mentioning. So, I know Jaime has been doing some serious testing lately and Payu too, beyond that I cant see anybody else who is doing anything besides just posting what they read and heard but never done. Although it is quite unfair to compare manufacturer backed team engines to those that are built in a small shop or home. Two very different engine built for very different uses.

That is the keyword right there.

It can sometimes produce a better powerband when inlet bottle necks are minimized.

Perfect timing until moar tests.

hey Jamie, is that 2.0 running a stock IM?