Why do people say when you add headers or exhaust or intake you just lose low end power and gain top end. So your only moving the power band .. nothing more

..... when i just looked at all the dyno testing roundups and especially with the injen and alphawerks header

... power was made across the wholeeeeee entire powerband from 3000 rpms to 6,500
... it looks like alphawerks made 10 hp throughout 3k to 6.5k

Does everyone mean power was lost from 2000 to 3000 rpms .. if so ... wow only a 1000 rpm range vs the 3 to 6.5 increase

even torque was increased through out as well .....

I trust about 10% at most of the dynos I have seen from manufacturers. I have seen intake dynos read 15whp on the tC... they MAYBE get you 1 -2 in reality and track times show it. They provide no gain in track performance at all.. which pretty much is the proof in the pudding.

Plenty of people have slapped on all the IHE mods and have seen 10 - 12 WHP in 99% of the applications where they actually took a good baseline and then dynod again under the same conditions. And countless have said they noticed a loss in other parts of the band.

Here is a writeup that will clarify it some for you

http://www.yoursciontc.com/information/backpressure.html

yea but im talking about the performance part testing roundup numbers ...

http://www.scionlife.com/forums/viewtopic.php?t=89753

and ive seen I/H/E tcs track slips go from 14.7 to 15.2 ..... these are not professional drivers

stock tc with professional driver is 15.5 right ?? ... not much of a gain but enough to justify these modifications i gues

I trust about 10% at most of the dynos I have seen from manufacturers. I have seen intake dynos read 15whp on the tC... they MAYBE get you 1 -2 in reality and track times show it. They provide no gain in track performance at all.. which pretty much is the proof in the pudding.

Plenty of people have slapped on all the IHE mods and have seen 10 - 12 WHP in 99% of the applications where they actually took a good baseline and then dynod again under the same conditions. And countless have said they noticed a loss in other parts of the band.

Here is a writeup that will clarify it some for you

http://www.yoursciontc.com/information/backpressure.html

Very nice wirte up! Great information there!

And just my .2 but I personally never installed my I/H/E setup because I was hoping for a lot of power I did it more for looks and sound more so than anything else...yeah i know thats a lot of money to spend on something like that but as long as i like it right? :P

I trust about 10% at most of the dynos I have seen from manufacturers. I have seen intake dynos read 15whp on the tC... they MAYBE get you 1 -2 in reality and track times show it. They provide no gain in track performance at all.. which pretty much is the proof in the pudding.

Plenty of people have slapped on all the IHE mods and have seen 10 - 12 WHP in 99% of the applications where they actually took a good baseline and then dynod again under the same conditions. And countless have said they noticed a loss in other parts of the band.

Here is a writeup that will clarify it some for you

http://www.yoursciontc.com/information/backpressure.html

Very nice wirte up! Great information there!

And just my .2 but I personally never installed my I/H/E setup because I was hoping for a lot of power I did it more for looks and sound more so than anything else...yeah i know thats a lot of money to spend on something like that but as long as i like it right? :P

^^ yeah, if you really want power save up for something that makes power.. i think people who buy bolt ons have a different perspective in mind..

Don't get me wrong. My cars performance did go up a bit..especially after my header/spipe...throttle response improved a bit and it noticeably pulls harder and feels smoother..but yeah..more or less it just looks and sounds cool lol..the improved performance to me is the bonus :P

if yoou want more than 20 hp at most, you gotta save big bucks, then you'll get big numbers. this tc is my first car, i dont need any more power than i have. but in the future that'll change lol

if yoou want more than 20 hp at most, you gotta save big bucks, then you'll get big numbers. this tc is my first car, i dont need any more power than i have. but in the future that'll change lol

^^ speed is addicting.. haha :love:

why is it when i had a CAI with a 4-1 header i lost all my bottom end but when i added my SRI(hot air intake) i gained nearly all my bottom end back

Sorry, but I call BS on running a 14.7 (nearly a second gain) with IHE.

why is it when i had a CAI with a 4-1 header i lost all my bottom end but when i added my SRI(hot air intake) i gained nearly all my bottom end back

^^ the amount of time it's taking to suck the air in.. with a cold air the pipe is longer with a short ram it's shorter..