APEXi rev meter

[LiU]

would it be possible for that to reset the rev limiter a lil higher? say 6800-7000... I dont want to remove it I only want to set it a lil bit higher...I'm planning to get cams to help high end breathing... would I need to address fuel issues as well... ><

96 ka24deinjen caihotshot headershks dragerspec stage 1fidanza flywheel

[corn322]

make sure everything else can handle it, like valve springs.

[LiU]

yes... I am wondering, if any1 knows, what fuel issues would I need to address? And also what 's the general concensus for the limit on the stock valvetrain? Thanks

[Dattebayo]

Well, unless you have really crazy cams, i would not see a need for anything else except new stock springs and shims (shims are important). But you should get walbro injectors, they are great improvements for the high end. (255's)

[LiU]

there's no need for ECU reprogram or some sort of piggy back fuel program? I was thinking if I extend the rev limit a little I would also need some sort of reprogram. Also as far as cams go I am either going to get the s13 cams or the nissan motorsports cams... why are shims and stock springs important?

[Dattebayo]

Well i was just refering to the mileage on your stock springs, thats all. If you use street cams (not full race, like nismo R4), then you are not really going to need race springs. Shims are important 'cause you need to have the valve clearance at spec, and yours maybe out of spec currently. Raising the rev limit, i think is something you do not need, you are already losing power at 6900, so you would be spending money for nothing. Search for some of the dynoes of other KA's and you will see the power drop off. You can clip the speed limiter wire though... and you'll get more results from that. Going with new fuel programs will help, but that's really only worth the money if you go turbo, or if you're concerned about running rich. Larger injectors will run that way, but they do help by themselves.

[LiU]

I was hoping that cams would help in high end power.. I read somewhere tha 248/248 nissan motorsports cams pull up to 7000... yes I am just looking at my options here, if cams and some headwork can keep power levels from droping after 6000 rpm, that would be nice (I know the motor isn't set up for high revs) but all I'm looking for is a few more coupla hundred RPMs to work w/... but if not, at least I would like a set up that will pull hard til stock redline (was it 6400?)... any suggestions besides cams?

[LiU]

oh yea... are there any after market valve springs avail. for the ka24de?

[LiU]

how much RPM exactly CAN a stock KA bottom end take?I want to get either the 248/248 cams or the PDM cams and both of the cams should still be good for some power a coupla hundred RPMs past the stock redline on a s14 (6400). I was thinking of using a rev limiter (maybe some aftermarket springs/retainers or just new stock ones) to reset the redline to maybe 6800-7000 but I was told the motor would shake itself to death.. >< which is bad bad...

plz submit someof your input

[Dattebayo]

I'm confused. My s13's redline KA24DE is 6900. Why is your s14's lower? Do you have a KA24E, and just mislabeled it?

2ND, The redline is basically defined as the RPM a motor can take before it "blows up". I'm sure you could take it about 2 or 3 notches up off the end of the redline, but you are causing damage in any part of the redline.

An engines redline cannot be "changed" without a LOT of work, involving changes to your head design and to the lower end. What YOU are speaking of is simply allowing your engine to enter the redline without being forced back down by the ECU. Again, if you love your car, dont do it at all. There are no higher limiters available either.

If you want higher redlines, go buy a Honda. But if you want NISMO 248's, go ahead, get them, and keep the rev limiter as is.

[LiU]

no... it's a KA24DE, a s14, so the redline is 6400... the s14 KAs are the same as the s13 ones except a coupla of minor differences (cams, intake manifold, ECU) as far as I know... the reason I want to extend the redline is because after looking into aftermarket cams, their power usually starts to fall off around 6500-6600, which is a coupla hundred RPMs beyond the stock redline, I just want to take advantage of those that's all. But now I dunno if I should get Ferrea titanium springs/retainer kit ($500~) or not, because I think those would be some sort of an overkill.

[LiU]

oh yea I do realize that our motors are not made to be high revving, but I just want to squeeze all the power I can.

[Dattebayo]

Im serious my s13 has a rev limit of 6900 and we have the same engine.(weird) Maybe if you put in the s13 ecu and use those cams, you might get the desired result. You will have to mess around with alot of wires, and disconnect a few sensors from the ecu. That's alot of work moving from obd-2 down to obd-1.

[LiU]

yes... nvm the rev meter can't reset the redline, so I'm going w/ a JWT ecu

[89S13SILVIA]

all car manufacturers set their redlines lower to prolong engine life and keep people from staying up there to long, but our motors can take it no problem i hit 7200 rpm all the time even though it drops power it shifts into the next gear way stronger.

[corn322]

DOHC redlines at 6900, SOHC redlines at 6400.put new cams in and all, then get it dyno'd. if you would see a benifit from the increased redline, go ahead.

[LiU]

from what i understand the s13s have a 6900 whilethe s14s have a 6400 - due to cam differences i supose - yes when I get my jwt ecu I'm only gonna have a 7000 - going up to 7200 isn't a really big concern - i wish some1 would amke really wild fresh grind cams with a spring/retainer kit for our KAs