Tri Y vs. Conventional Header....

[Reed Granrt]

Originally Posted by chassis1

a dyno is the only repeatable situation.......I know there are many who would rather make a million runs on the car and put more variables to see if a header is any better than another.....

dyno is much more affordable in my book......

I totally agree with data from a dyno. Most runs can be very closely simulated with a dyno if it has a servo controlled valve. I reworked my dyno well over a year ago to simulate (make) gear changes. If you have your car on a data logger, you can totally simulate the run. Example lets say the car launches at 5600 rpm and stays in low gear for 2 seconds and accelerates to 8500 in that time and then the gear change is made from 1st to 2nd and motor drops 1500 rpm's on the gear change and accelerates to 8700 in 3 seconds and makes 2nd to 3rd gear change and engine drops 1300 rpm and accelerates to 8900 rpm's and goes thru the traps at that rpm and it takes 4 seconds to do that. With my dyno, I can take that info and program with a formula that will duplicate that exact run. You can actually let the dyno acclerate the engine at each individual gears acceleration rate. If you overlay that dyno run to one made with regular headers, you can see any gains and losses in any gear. If you see gains, you could actually hypothesize as to how much change in ET you would actually see. You notice I said hypothesize. Then it is ready to go to track to see if it does exactly that. Damn I luv this crap; dont yall
reed