higher RPM

[ELITEBB127108]

thanks for the suggestions guys....well i guess im not getting the s15 tranny after all...
but i was wondering, i seriously think the s14 RPM's are very low.... not that its bad, but since im getting a turbo, i dont want the first gear going in a second. i know that getting lighter, newer, stronger springs raises the RPM, what other options do i have? can i get shorter pistons/connecting rods/ect? or am i wrong? what else raises the RPM? i want the RPM to go about 7500...its about 64 right now......how hard is it to raise it up that much? what are the costs? what are the pros and cons? thanks guys!

[240meowth]

i have to say, decrease the stroke, it'll help you engien rev higher. how much, i don't have a clue...

just remember, the F1 engines have HUGE ASS BORE and <span style='font-size:8pt;line-height:100%'>tiny ass strokes</span> ultimately 14,000 redline =)

[s14boi]

you would only need to rev higher if your engine is actually modified to make power that high up. &nbsp;right now there is no point in revving higher coz you wouldn't be making anymore power. &nbsp;r u getting the sr20 turbo engine? &nbsp;or jus turbo ur KA? &nbsp;cuz i thought the redline on the sr engines is around 7000rpm and max horsepower was at 6000rpm

[SaintlyCharBoy]

just a thought, to create any significant increase in RPM, you would probably need to balance/knife edge the crank, and you would probably want to work with the springs, they will need to be stiffer / stronger (valve float is BAD)

i'm not really sure about shortening the stroke doing anythign for rotatiohnal velocity

i believe that valve travel (openning AND closing) has more to do with the possibilituies than stroke...

i believe that someone here has a redline of 7500... dsc maybe?

[DuffMan]

I think a 7500 rpm redline is a standard option on a JWT ecu upgrade, and the stock springs can take it.

[junia]

Please correct me if I'm wrong but if you wanted to raise your rpm and actually have it be an advantage wouldn't you have to change cams to raise the power band?

[DrDubbleB]

Well, I was thinking along the lines of 240meowth, de-stroking the engine is what I would think would give the desired result, and de-stroking in effect does change the power-band, so yes, you would be making power that high, but a change of cams certainly wouldn't hurt. &nbsp;It's not exactly a typical thing to do though, if you want a rev happy motor, go with the CA.

[boywonder]

Bore and stroke would help alot, but you'd also have to worry about balancing, friction, and intake/exhaust flow. I doubt it would be necessary to do all of this, but it would probably take a lot of strain of you engine. This means, if you had the cash, you should knife edge and balance the crank as SaintlyCharBoy said. Also, get your ports tweaked (from someone who knows what they're doin), cams with higher lift. Longer duration if you want more high end power. Lighter rods and pistons would obviously help. Stronger springs might be needed, but should be avoided if possible because they cause more wear (how much, no clue). Your stock ones should work fine. I'm not sure how changing the bore or stroke would effect VE, but if you know what you're doin, i wouldn't see why it wouldn't. Which one of these would be the biggest benefit? Hmmm... like i said, don't know much about bore and stroke, so with that excluded i'd probably say cams. And all these choices are the only downside to cars. They all cost money, and it's hard to find people who know what to do first.

PS i dunno about squirters or spark either

[tnord]

here's what you will need to do......

1. like junia said, i would expect that different cams would be needed to focus more on top end power.
2. find a VERY reputable engine builder, and have the engine balanced and blueprinted. what this does is completely tear apart the engine piece by piece. doing a complete inspection of each part, including measurements, weights, and load tolerances. remember that parts such as valve springs are not all the same, the factory has certain tolerances it allows for. the engine builder holds much stricter tolerances and will replace/modify whatever parts he feels necessary. &nbsp;before you send the engine in, tell him what you are trying to accomplish; most likely, they have done someting very similar before and will have a plan of what to do.
3. as stated before, unless you have power up there, the new rev capabilities are useless

oh yeah, expect the balance and blueprint to cost you over 1000 bucks.

[9524tee]

why would you want to do that ? getting the rpms that high is pointless on a ka motor, the power drops after 6 anyway

[luey02]

this is probably what I'm gonna do after a turbo and ecu upgrade on my sr20det (soon to be swapped)

new cams and set the rev limit to 8G. What would break
first? &nbsp;

but remember new cams that uses high end power will have rough iddling..