Tuning with tri-y headers

[my69396]

Wanting to know if there is a difference in the tune when going from 4 into 1 step headers to a tri-y step header?

[Pedigo Perf]

Did you change the cam too?

[Greg Hill]

I can tell you from personal experience the camshaft can make a big difference with tri-y's. The stock eliminator racers who use tri-y's and have found et have worked with cams. Also the dyno will not tell the tale.

[Jim Caughlin]

As a header builder, I tell people to not go with tri y headers unless they have they are very serious about putting the time into making them work. Tri y's are a lot tougher to tune. Also, it's very easy to mess up on the sizing with bad effects. In a word, tri y's are not for the faint hearted. Plan on building more than one set if you really want to make them work.

Jim Caughlin
SS 6019

[REGGIE WINKLES]

When I switched to Tri-y headers I had to richen the carb as they like more fuel. My car is a stick which may vary from auto trans car. Those headers were worth about .05 overall after tuning on my application. 4-7 swap cams will not work with Tri-y's. They really pick up the 1/8 time, not so much on the top end of 1/4 tracks. Overall they are an improvement, but for my 2 cents I would say they perform much better on auto trans cars than with the stick. I don't know for sure, but have heard anywhere from .10 to .12 on auto trans car. Hope this helps.

[James L Miller]

Originally Posted by REGGIE WINKLES

4-7 swap cams will not work with Tri-y's.

I would think that would depend on the cylinder pairing. In the old days I think Tr-Ys were developed to get away from the 5-7 firing order so they would pair 1&5 and 3&7 together or something like that. I'm not familiar with the new Tr-Y headers. How do they pair them now?