1NZ-FXE inake manifold ?

[Yaris Hilton]

When you go changing around manifolds, you're likely to change the resonant frequency at which you get the optimum "ram" effect of the intake pulsations producing a positive pressure at the intake valve near closing, which gives you a bit of free "supercharging." The stock engine with the stock manifold has its torque peak at 4200 RPM, but has an amazingly flat torque curve across the whole band. You might end up getting a higher peak, but lose torque in the midrange and lose performance overall.

[Parmas]

Originally Posted by Yaris Hilton

When you go changing around manifolds, you're likely to change the resonant frequency at which you get the optimum "ram" effect of the intake pulsations producing a positive pressure at the intake valve near closing, which gives you a bit of free "supercharging." The stock engine with the stock manifold has its torque peak at 4200 RPM, but has an amazingly flat torque curve across the whole band. You might end up getting a higher peak, but lose torque in the midrange and lose performance overall.

So your opinion is to leave it stock?

My intension is that I want an intake that produces more torque and power above 4500rpm compared to the stock one. I am aware I might loose low to mid range efficiency but that isn't important for my car as its not my daily car anyway.

To Bluevitz.... are you sure it is way out? How did you conclude that? visual estimate?

[Yaris Hilton]

The only way to know what it will do is to try it, with a dyno run before and after under similar conditions. I suspect that the Prius manifold is tuned perfectly for Prius operating conditions, operating at midrange RPM with a VERY retarded intake cam to simulate Atkinson cycle operation. (Lets compressed air out the intake back into the manifold to drop compression, while keeping the full expansion stroke.) Whether its runner length also happens to be right for maximizing top end horsepower on an Otto cycle 1NZ-FE I don't know. There are formulas for calculating this stuff.

[Yaris Hilton]

Here's a link with valve timing specs for the 1NZ-FXE that you can compare with the 1NZ-FE specs from that cars.ru link that's floating around here:

http://www.electrifyingtimes.com/priustechspecs.html

[Bluevitz-rs]

Originally Posted by Parmas

To Bluevitz.... are you sure it is way out? How did you conclude that? visual estimate?

Back when I worked for Toyota Canada, one of the techs was trying to fit a 1ZZ TRD SuperCharger on a 2ZZ display motor and the 2ZZ was wider than the 1ZZ. And it's been confirmed that the 1ZZ manifold is too wide to fit the 1NZ.

So that how I know it's not even close, but if you still want to try, you always can. I'm just trying to save you the hassle.