i have a 98 Z24 5 speed. and for some reason i tried getting on it the other day and while in second geear i hit 6,250 RPM right at the red line and it bogged as if i missed third. but yet i look at sqwirls vids and some other vids on you tube and cavys and sunfires are hitting 7-8,000 RPMs. what do i need to do?

Start by building an engine that will perform at those RPMs. There is a good reason for that limiter.

Once you've done that, it will, of course, need to be properly tuned.
When you get to that point, you won't need to ask the question.

what does exactly will happen "if" you remove the rev limiter with a stock engine???just wondering...

it will go boom. and you'll be looking for a new one.



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In stock motor it can be made but it is necessary to keep in mind that there is not good lubrication after the 7000 rpm, you should make the swap of bomb of oil for that of the 2.3L, after that it`s more safe.

how about the speed limiter?

ryan99 wrote:how about the speed limiter?

why would you need to know how to raise that?



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ryan99 wrote:how about the speed limiter?

Trying to get this thread locked?

i'm not asking how to do that, just asking how it will affect the car, will it damage the engine?etc.? I know it's taboo here guys and am curious why it is so. sorry

You run a high risk of damaging the engine removing the limiter with little to no modifications. The reason it's never mentioned how to remove the speed limiter is because 1. it's illegal, 2. the stock suspension can't handle it, and 3. removing it says one thing: you plan on doing above that (likely breaking the speed limit). There is a reason they say you will know how to once you tune your car, and well, when you know enough to be able to tune it yourself, you'll know enough to decide whether removing it would actually be of benefit (1/4 mile).


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thanks

ryan99 wrote:how about the speed limiter?

you can end up killing yourself, or other people



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thanks. i was just wondering why it wasnt doing that. i saw a stock sunfire on youtube hitting 8000 RPMs and thats why i was wondering. this friday i buy CAI crankshaft pulley and header back exhaust. so hopefully i should hit higher with those

OneQuikZ24 wrote:thanks. i was just wondering why it wasnt doing that. i saw a stock sunfire on youtube hitting 8000 RPMs and thats why i was wondering.

Too bad the video wasn't long enough to see the engine blow up.

OneQuikZ24 wrote:this friday i buy CAI crankshaft pulley and header back exhaust. so hopefully i should hit higher with those

Ummm...nope...

A CAI and pulley are not going to make your engine beat the limiter, and they aren't going to make it capeable of handling higher RPMs.

Seriously, forget your rev limit for now, there is much more you still have to learn.

i have a quick question and i dont mean to raise any flame but how many ppl have actuall removed the top speed limiter cus it makes it hard to run a 1/4 mile at above 100+ mph am i correct

james gilk wrote:i have a quick question and i dont mean to raise any flame but how many ppl have actuall removed the top speed limiter cus it makes it hard to run a 1/4 mile at above 100+ mph am i correct

i know of a few who have done that



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^^ +1. many on this site have done it, legally, and for that very reason. if you can build a cavalier that hits 108 in 1/4 mile, then you'll already have the knowledge of a few ways to do it.



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jesus crist people... answer the guys questions.

to raise the rev limiter you need a tuning software called 'HP Tuners' or send your computer into someone that will tune it for you. same goes with the speed limiter.

HPT goes for around $600, or you can have it done through various people's on here for much cheaper (i had mine done through shifted tuning for around $175)

and whats this ish about blowing the stock motor cuz of a raised rev limiter? pj was throwin his stock eco bottom end to 8000 and so have others. yes its a risk, but its not like its gonna blow right off the bat.

personally, i would only raise the stock rev limiter on an otherwise stock engine to get you into the power band better slamming through the gears. the truth is an even modded 2.4 wont make power after much more then 6000. your going to need EXTENSIVE work in order to get that 8000 to work for you if at all.

my advise: dont worry about the rev limiter until you need to. get your parts on as well as many others and read up read up read up while doing it.

Pj and a few others have hit 8k and over but not a single one was on a stock motor. they all have had lots of mods. pj was on a stock bottom end but had a patriot stage 2 head and some other valve train goodies.

to answer your original question. like mentioned above use hp tuners.
however DON'T do it with zero valvetrain modification (IE: head work, cams, valves, valve springs, upgraded oil distribution etc.)

finally a couple of straight answers. thank you! thats all i wanted to know

OneQuikZ24 wrote:i have a 98 Z24 5 speed. and for some reason i tried getting on it the other day and while in second geear i hit 6,250 RPM right at the red line and it bogged as if i missed third. but yet i look at sqwirls vids and some other vids on you tube and cavys and sunfires are hitting 7-8,000 RPMs. what do i need to do?

That seems odd. I thought the rev limiter was set to 6,450... and worry about your oiling problem before trying to inrease the rev limiter, or else you'll have a #3 rod bearing problem.


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"Youth in Asia"...I don't see anything wrong with that.

i know of at least 2 ways to to raise the top speed limiter and in any case i have no reason to go that fast and for good reason
i had a blow out on a car at 80mph and rolled the car lucly i walked away with a few minor scratches

any ways enough of that what kinda hp is required from a cavalier to reach 109 in a 1/4 mile if i may ask

z yaaaa wrote:jesus crist people... answer the guys questions.

to raise the rev limiter you need a tuning software called 'HP Tuners' or send your computer into someone that will tune it for you. same goes with the speed limiter.

Therein lies the reason I said you'd know when you went to tune it...


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HP Tuners? I thought to kill the speed governor you needed to do this thing in the car and it's easy to do and it keeps it from limiting your speed. You know what I mean, right?

This pushrod 2.4 of yours isn't an SOHC / DOHC Honda engine that can reach 5 digit RPMs with a "block brace". I would work on powering it up before trying to raise the rev limit. For that you need at the very least serious head/valvetrain work to keep the oil flowing and the valves from floating. Don't forget the bottom end, too, because to hit high RPM the engine needs less vibrations and stronger parts, meaning a stronger bottom end (e.g. the "block brace"), better rods, and a more rigorous engine balancing. Let's not even go into boost.

At least it's not an MGB, where over-revving the engine instantly launches the rods into low orbit.


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Impreza WRX wrote:This pushrod 2.4 of yours isn't an SOHC / DOHC Honda engine that can reach 5 digit RPMs with a "block brace".

the 2.4 twin cam does not have pushrods.

its a DOHC.