How To Get The Redlining Higher

[nissan240sx92]

Hi i was wondering how to make the redline to go up higher to make my enigne redline or get the most hp around 8 or 9 rpm some people say that getting cam and cam gears would bring it up a little and that making a shorter stroke would make it go higher too just looking for a little help on to do that before i go and rebuild my enige and what would be got parts for the engine interals thanks

[Bryants95240sx]

there is not point in making the ka rever higher it losses power above 5500-5700

[Juggernaut]

I personally wouldn't take a KA any higher than 8k, even it you did enough mods to make it worth revving that high. It's a big motor to be going that high. If you want revs, do an SR or maybe an RB20.

[:: orion ::]

Crank harmonics get nasty at ~7500 and up...so any extended amount of time spent at +7000rpms will cause a rod to leave the block.

How can you get past this? Custom crank, reduced stroke...lots of $$$.

So be happy with your 7k redline.

- Brian

[Juggernaut]

What about micropolishing, balancing, etc the crank? I was at least hoping to get 7500-8000(at the absolute most). That was my one hang-up on staying with the KA over the SR is my last car revved to 8800 and made power all the way there.

[kamikazestorm420]

get the CA18 if you want to rev high

[1995 240sx]

The problem like Bryants95240sx said the KA does not make power at high RPMs that is why u need to short shift to stay in the power band you can build the KA to rew higher but it cost lots of $$$ and then will have a problem making power at lower revs where you need it

[Nathan]

Here's the trick, drive about 70 in fifth...then shift into second. Instantly, your "redlining" will be higher.

[nissan240sx92]

Here's the trick, drive about 70 in fifth...then shift into second. Instantly, your "redlining" will be higher.

You would be stupied to do that no one wants to blow there engine doing that

[nissan240sx92]

How can you get the ka to make power in the higher RPMS

[frapjap]

The engine doesn't like to breathe much above 6000 rpms. Try driving it the way it is stock and attempt to red line it. At about 1k rpms short of the red line, you will feel it cut out and loose power. The only way this isn't going to happen is with a lot of work put into the KA. Its going to need a whole new bottom end: crank, rods, pistons, not to mention the valvetrain that can keep up and move as quickly as the greater amount of air you are displacing bu stroking the motor. You'll need some somewhat radical cams with overlaping durations, a much more efficient head and well...basically you're going to have to build the whole motor. Which, if that is what you're trying to do, essenitally rebuild the whole motor, is great. But I haven't heard of or seen anyone willing to devote that much time and money to accomplish this feat. If you really want a 'high reving engine' then fabricate a way to swap a Wankle application into the 240. That would be something neat.

[fuzion]

What about micropolishing, balancing, etc the crank? I was at least hoping to get 7500-8000(at the absolute most). That was my one hang-up on staying with the KA over the SR is my last car revved to 8800 and made power all the way there.

No VTEC here.

[redamnavit]

How can you get the ka to make power in the higher RPMS

If you seriously want a high-reving N/A engine that works well with your 240, find an RB25DE clip. They're dirt cheap, have more stock power than a KA, and the inline six will respond to high rev treatment a lot better than your KA will. Its also unique and dead sexy.

[LiU]

How can you get the ka to make power in the higher RPMS

with money and time, its possible ot do anything, but it doesn't mean it SHOULD be done. heck you can make a geo metro into a street beast but why would you??!

you can get some cams to shift power band up 200-300 RPM.

[frapjap]

haha, no vtech. Not to steal the thread, but does Nissan make a variataion of VVT?

[nissan240sx92]

ok thanks for all the help guys

[redamnavit]

haha, no vtech. Not to steal the thread, but does Nissan make a variataion of VVT?

Yes. The SR20VE, QR25, the VQ series have it. I think(?) the VGs had it as well. I forget Nissan's name for it, but its all variable valve timing by another name.

[fuzion]

haha, no vtech. Not to steal the thread, but does Nissan make a variataion of VVT?

Hi.

VTECH is a company that makes telephones and childrens toys.

I think Nissans is CVT or something..

[frapjap]

Cool, thanks for the heads up on the variable valve timing. It just seems to be something that only the import companies are applying. I haven't seen any variation on domestics yet.

[Onizuka]

Yes. The SR20VE, QR25, the VQ series have it. I think(?) the VGs had it as well. I forget Nissan's name for it, but its all variable valve timing by another name.

SR20VE does not have variable valve timing, sr20det and sr20de in the S14 and S15 flavors do.

[Juggernaut]

No VTEC here.

Funny.....I don't remember my Subaru having Vtec. :rolleyes It's called AVCS and I didn't even use it on my motor. What makes power to redline is having a turbo that flows 966 cfm @ 1 bar, then running it at 2 bar.

[redamnavit]

SR20VE does not have variable valve timing, sr20det and sr20de in the S14 and S15 flavors do.

I think you've got this backwards. None of the "DE" SR20s have variable valve timing. The SR20VE NEO VVL is the only one with VVL. The S14/S15 SRs had different head ports than the S13s, but that's about it.

And fuzion, unless I'm wrong about the above then yes, Nissan calls their VVT setup VVL. I don't know what the L stands for.

[xekushnr]

im pretty sure the late model s14 sr20s had vvt as well as the s15.

[redamnavit]

im pretty sure the late model s14 sr20s had vvt as well as the s15.

Fair enough; I'll stand corrected, and now I see where I was wrong. Here's a rundown I found:

http://nsnissan.tripod.com/vearticle.htm#

"There are five (5) VE motors. SR16VE - 173hp 5 speed Manual 97-2001 SR16VE N1 - 197hp 5 speed Manual 97-98 SR20VE - 187hp CVT 6 speed Auto 97-2001 SR20VE - 204hp 6 speed Manual 2001-Present SR20VET - 276hp AWD Turbo 2002-Present "

Nice stuff. 204hp from a 2 litre is Honda territory. My mistake though; VVL is like VTEC, not like VVT. Sorry guys.

[Bigrolla]

i hope his sig is a joke.Electric super charger hehe damn ebayers rippingpeople off still lol.

[93sleeper]

CVT is continuously variable transmission, like in the Murano.

[SloMoe]

The terms are getting mixed up. The 2 abreviations Nisssan uses is VTC and VVL. VTC (Variable Timing Control) is what comes on the late model SR20DET's, RB26's, some VG's and VQ's. It's a device that is attached to the end of the cam sprocket, and controls cam timing advance from around 1000rpm to about 4800rpm. This is nothing like VVL or VTEC which actually changes valve lift and duration by switching to a different cam lobe around 5000rpm to redline. VVL (Variable Valve Lift) is Nissan's version of Honda's VTEC and is designated by 'V' in the model number (ie SR20VE). This system functions almost exatly how VTEC does.

So in short VTC varies camshaft timing (advance/retard)VVL varies valve lift and duration, and has nothing to do with advance or retard of the camshaft.
Modified by SloMoe at 11:16 AM 9/2/2004

[nonchalant rage]

continuously variable transaxle