Increasing Redline

[toki]

Sorry for this newb like question, but I really don't know, how do you first determine non the less increase a car's redline? I've had people tell me that the engine would explode if it went over it too far or that it would shake out of position and 3 different answers, so could someone tell me definitivly? Thanks.

[Nismo1182]

Sorry for this newb like question, but I really don't know, how do you first determine non the less increase a car's redline? I've had people tell me that the engine would explode if it went over it too far or that it would shake out of position and 3 different answers, so could someone tell me definitivly? Thanks.

Modern cars with ecu have a preset redline. The car wont go over it when accelerating, if you hit the redline either the fuel would cut or the ignition or both. Now if you downshift to a low gear that even the redline wouldnt stop you would blow your engine or maybe bend a few valves if your lucky.

To raise the redline, you would have to have your ecu reprogrammed and some headwork done to justify it. Like cams, valves, valve springs, port polish, etc.

[Exar-Kun]

increasing a redline only helps if the cars powerband can support it, IE the engine can flow enough air to feed itself. the stock KA power band tapers off over 6400rpm, and would probably completely die at 7000 anyway, so unless you had serious work done to allow the engine to flow(and flow well) above that RPM, the stock 6800-7000rpm redline is more than enough.-chet

[trpower7]

:Werd

[toki]

gotcha, now here comes part 2, to increase the power band would that mean chaning up gear ratios or compression ratios or what? and would it even be benificial to raise the power band to peak at 9500 rpm or something or would it just make it take longer to initially reach your peak power?

[Nathan]

most likely you would alter your power band with a combination of things...different cams being the key but you would also want to increase the flow in your head by port and polishing, upgrading valve springs etc. BUT, the KA engine is not naturally good for revving high because of the stroke being significantly larger than the bore.

[PabloHoney]

...the stock KA power band tapers off over 6400rpm, and would probably completely die at 7000 anyway, so unless you had serious work done to allow the engine to flow(and flow well) above that RPM, the stock 6800-7000rpm redline is more than enough.-chet

The KA24DE tends to run out of breath above 5500 and redlines at 6500, not 7000.

Making the KA rev higher would be pretty much pointless, unless you did something to decrease the stroke a little, and then you would just be spending more time/money than it's worth. Plus everything that Nathan said =)

[Nathan]

Hey PabloHoney...off topic questions but how well do those wheels clear in the front? did you need spacers or anything?

[NiTeRiDeR]

im gonna send my KA24E to engine heaven when i get my Sr20det

im gonna get up to like 200 on the highway .. and downshift to 2nd gear

i wish i could get into first

lol

ill video tape it too

should be this summer

just cuz this engine has given me so many problems i wont shed a tear when i blow it up

except i mite need a new hood lol

[MainEvent212]

um...a 1990 240sx will never hit 200 mph with a KA24E adn stock gears...

no KA will ever hit 200 mph w/o 10s of thousands invested...

sorry...you might hit 120 if you're lucky

and you probably wont be able to blow it very easily...think about it...you'd have to get hte car home...you'll be making a mess of your engine bay.

EDIT - MAINE... don't bash people.

[Exar-Kun]

maybe thats YOUR KA. Mine has a 6800 redline on the tach, and the dyno pulls well past 5500....

but then again, it might be cam differences between an s13 and s14.

anyways....like I said increasing redline onyl servs a function when the engine can flow at the specified RPM.-chet

[NiTeRiDeR]

sorry guysim not a noob

just made it sound like i am tho

im in canadai meant 200KM/Hwhich is like... 120M/H

didnt mean to sound like an idioti was just tryin to joke around a bit

sheesh

[toki]

You could always just fill up with diesel and watch the shades of black comming from the exhaust

[C-Kwik]

um...a 1990 240sx will never hit 200 mph with a KA24E adn stock gears...

no KA will ever hit 200 mph w/o 10s of thousands invested...

sorry...you might hit 120 if you're lucky

and you probably wont be able to blow it very easily...think about it...you'd have to get hte car home...you'll be making a mess of your engine bay...just shut up. u sound like an idiot

How much does it cost to drop a 240 out of a plane? hehe.

[NiTeRiDeR]

plane wouldnt be funyou wouldnt see it hit the ground

CLIFF would be fun

hehe