Hello all. I am new to this forum and I have decided to start off my first entry (question) with what i feel is a very rookie question--

Why does an L28 make less HP than a L24?

To my understanding, the fuel-injected L28 makes less HP because of "an increase in smog emissions requirements(back in '74)." So, I assummed that removing all of the egr and smog stuff would make for an immediate HP gain. But, I read that this in fact does not icrease HP and could even lead to a decrease in HP. Any info relating to this would be greatly appreciated since the answer to this question has evaded me for so long.

BTW, I currently do not own a Z, but I am planning on purchasing one soon.

Specifically, I am planning on swapping a 280xt engine into an early Z. Still looking for the right one!

Define less.

Read these links with regard to net and gross horsepower:

http://en.wikipedia.org/wiki/Horsepower

http://neptune.spacebears.com/opine/horsepwr.html

I'm not sure when Nissan started using SAE net horsepower for rating their engines, but I know that the 2.4L is a gross horsepower rating.

I think Nissan made the change from gross to net in 1979. The 78 L28E was rated at 170HP/5600RPM vs 150HP/6000RPM for the L24, both of which are net HP. The lower HP ratings for the L28E began in 1979.

  SFART said:

Specifically, I am planning on swapping a 280xt engine into an early Z. Still looking for the right one!

If you are putting in a 280zx turbo motor, isn't this discussion rather pointless, as the zxt can make alot more power than either the L24 or L28.

...and why are there two threads created by the same member on the exact same topic?

Three!!!!!

Hi, SFART,

Welcome to the club!