top end trouble

[red_s13_2]

I just bought a 92' 240sx and it has very little top end power. Its great between 3000 and 4500 rpm, but after that its just nothing. Any suggestions?

[Onizuka]

the KA's useful powerband lays in the 3000-5500rpm range, you can thank the engines large stroke for that (but hey, it gives you great torque )

[Nismo_Freak]

Replace the fuel filter

Also grab a can of non-chlorinated brake cleaner and hose down the MAF's wire and clean out the throttle body.

Pull a few of the spark plugs to check their condition... replace as necessary. Feel free to post a pic or a desc. of what they look like for analysis.

Pull off the spark plug wires and make sure they are in good condition (no cuts, frays, burns, etc.)

Pull off the distributer cap and check to see if the rotor is still in good condition, it should just be metal, no white residue, no burnt look.

Check the distributer cap leads for excessive white residue... clean them off with a peice of sandpaper (don't get too carried away) or replace it if they are bad.

These are just some general items that cause poor top end peformance on the 240. Cheap to fix for the most part.

[prigo]

My 240 seems to get nice torque from like 3500-5000 rpms, but it seems to get a little but of a powerup from 4800-6000 rpms. Isnt that around the peak horsepower area?

[Nismo_Freak]

5500 = peak hp

[prigo]

ty <3

[Silent Drifter]

Just open up your exhaust an you will have great power after 5500.