DC sports header installed.

[Joker]

I'm not going to waste the money to dyno the car, but there is a noticable power increase BELOW 5000 RPM. The car even takes off from a stoplight easier. The bottom to mid range gain was more dramatic than the top end gain.

Keep in mind, all I have done to the car is the header and a light crank pulley.

Not to really get into this but how do you know there is a "noticable" power increase below 5000? Louder doesnt equal more power. Smoother doesnt equal more power. As far as the car taking off from a stoplight easier, again this doesnt indicate you GAINED anything. As far as the pulley goes, it does nothing in terms of performance other than lightening up your car by a whopping 3 lbs.

The standard rule of thumb, at least in drag racing is for every 100 lbs of weight loss you gain 1 tenth of a second in your eta. Thats 1/10, not 1 second.

If spending 50-75 to dyno a car is a waste of $ to you then great, you should have more of a concern spending 250+ to gain nothing.

As far as the header design goes, check DC's own site....4 into 1's are high rpm applications (5000-8000 rpm)....Not my words but DC's.....

Peace

[largeorangefont]

Originally Posted by Joker

Not to really get into this but how do you know there is a "noticable" power increase below 5000? Louder doesnt equal more power. Smoother doesnt equal more power. As far as the car taking off from a stoplight easier, again this doesnt indicate you GAINED anything. As far as the pulley goes, it does nothing in terms of performance other than lightening up your car by a whopping 3 lbs.

The standard rule of thumb, at least in drag racing is for every 100 lbs of weight loss you gain 1 tenth of a second in your eta. Thats 1/10, not 1 second.

If spending 50-75 to dyno a car is a waste of $ to you then great, you should have more of a concern spending 250+ to gain nothing.

As far as the header design goes, check DC's own site....4 into 1's are high rpm applications (5000-8000 rpm)....Not my words but DC's.....

Peace

Im not going to argue with you, but suffice it to say I know what I'm talking about and I've been tuning cars for about 5 years. My other car is a 550 HP Cobra, and I would rather waste money on it than the Yaris. I got the header free BTW.

The header did not make the car louder at all. The header did not make it any smoother. It has a bit more power, that is it.

True, a 4-1 is a design geared towards topend, but longer primaries give more bottom end. As I explained in the original post, this header has longer primaries, and that is where the increased low end has come from.

Ashley