Aftermarket Exhaust; More Power?

[Astroman]

The TRD ver. S dynos about 2+ hp. The NST pulley felt about the same for gains, and was a lot cheaper.

[ya_RS]

Originally Posted by Astroman

The TRD ver. S dynos about 2+ hp. The NST pulley felt about the same for gains, and was a lot cheaper.

with all due respect... " you felt a 2 HP gain" ?

Originally Posted by Spades

anyway, i think we are all in agreement,low end power will be lost with larger piping but you will get some high end gains...its a give and take kind of thing.

I agree

[Astroman]

I was just saying for comparison purposes that the difference with the NST pulley performance wise was about the same as when I first put the TRD v. S exhaust on. My exhaust was used as a test unit from a DC Sports dyno run. They needed a stock yaris to run on the dyno with stock & TRD exhaust for R&D. I bought my exhaust from the owner of the test Yaris (they had given him the exhaust for allowing them to test on his car.) The previous owner said the dyno resulted in 2+ hp increase. The exhaust was the first mod to my car and I did notice a modest difference. About the same modest difference in acceleration was noticed with the NST pulley. I am in no way saying I know what a 2hp increase feels like, just that the addition of the pulley felt the same as the addition of the TRD exhaust. I have no dyno numbers with the pulley and TRD exhaust together, just the TRD on a stock yaris. I will be doing a dyno run after I install my AEM intake this weekend, but that of course will be showing the results of the TRD exhaust, NST pulley and AEM intake.

[jdium]

2hp is probably not feelable, if that's a word, unless you have a really sensative ass I'm guessing it's a placebo effect type of thing, you expect to feel more power, thus you do...

[Astroman]

Originally Posted by jdium

2hp is probably not feelable, if that's a word, unless you have a really sensative ass I'm guessing it's a placebo effect type of thing, you expect to feel more power, thus you do...

Well, I did manage a 17.356 quarter mile time, about a half sec quicker than stock.

[jdium]

Originally Posted by Astroman

Well, I did manage a 17.356 quarter mile time, about a half sec quicker than stock.

Half second quicker than YOUR stock time, or some magazines stock time? Just askin, cuz 2 hp is worth about nothing in the 1/4 mile. Even if you want to consider it a 2% increase, that means you would cut .35 of a second off you're time, all things being equal...but if you happen to have a slightly lower temp, or a slightly higher tail wind, or a slight change in relative humidity, or a slight change in tire pressure, or a little more or less caffeine in your quick twitch system, or a stickier track, or a slightly higher rpm launch, or just Zeus helping you, going a half second faster than 17.856 is like a 350 lb chick losing 12 lbs, she's still fat...

[hasher22]

An aftermarket lightweight pulley doesnt give u more HP, it just revs up faster thus giving u faster speeds....

an exhaust will give u hp gains thus more airflow, so will a muffler.......