Tri Y vs. Conventional Header....

Grant Eldridge · 03-29-2012, 10:04 PM

Not really a thorough evaluation, but we did a dyno pull using the same stepped primary pipes, first pulls were with a 4 into one burns merge collector and 18" of collector pipe, then replaced that with a 4 into two into one merge collector setup with a megaphone style end. We changed nothing else and saw a 4 hp increase. We were chasing other issues and did not change the tuneup, but felt that at least we did no harm with the Tri-Y setup so intend to use them in the car and test further at the track. It seems that the fuel curve was considerably leaner than previous tests we had done but the BSFC numbers looked good on our dyno sheets so we'll give them a try...

03-29-2012, 10:04 PM	#13
Grant Eldridge Member Join Date: Jul 2007 Posts: 124 Likes: 0 Liked 0 Times in 0 Posts	Re: Tri Y vs. Conventional Header.... Not really a thorough evaluation, but we did a dyno pull using the same stepped primary pipes, first pulls were with a 4 into one burns merge collector and 18" of collector pipe, then replaced that with a 4 into two into one merge collector setup with a megaphone style end. We changed nothing else and saw a 4 hp increase. We were chasing other issues and did not change the tuneup, but felt that at least we did no harm with the Tri-Y setup so intend to use them in the car and test further at the track. It seems that the fuel curve was considerably leaner than previous tests we had done but the BSFC numbers looked good on our dyno sheets so we'll give them a try...