Originally posted by GNSCOTT
I STILL sticj with my beleifs. I said why the IC isn't much help, I've said why the headers aren't any help (ATR headers don't even help a stock TR), and I know Tom at champion has flowed both heads and said the TTA heads flow a little more but not what people are claiming. I deffinately do not beleive in a butt dyno, because my Iroc's beacause they had such a rough ride always felt faster. When I drive my vette sometimes i look up and i'm doing 100..It doesn't feel that fast because the ride is so much better. The web site you posted is exactly like you described, people sticking up for their own vehicle. 3#'s of boost will feel faster and is problably 2-10ths, 200#'s is another 2-10ths. I failed Physics, but i'm sure the aerodynamics helps at least a 10th, so there's a half second minumum right there..
I think the board and particularly this section is here for these kinds of conversations. I still think that both running 16 or 16.5 #'s of boost, these cars have the same HP. STILL jmho.
One point you miss on the head flow is a substantial one..rocker arm ratios. While the cam was the same..what happens when you increase the lift and duration of the stock cam by meerly using longer rockers. Stock TTA rockers are 1.67-1.7 vs 1.5-1.55 for the GN..
May not mean a lot..but add the extra boost, higher timing of the factory TTA chip, better fuel lines(less bends), better IC, and headers..lower rear end gears..little at a time..it adds up big time..So flow may be comparable at .400 lift..but if the factory cam is .398 for the GN..the TTA is more like .418..as an approx.
That is why they MPH better..I wouldnt trade a GN for my TTA at 140 MPH..or a handling situation...but I love the street manners/getting in and out/daily driver scenario of the GN..
My .02
