How High can the Si rev?

[brooklynscat69]

Originally Posted by Rownan

No, vtec engages at ~6100 rpm on the k20.

Correct.

[K20Z3Si]

All of this dosnt matter because a new v6 rav 4 will beat us in 0-60 and 0-100 by 3 seconds... its a suv!

I have driven alot of fast cars and no matter how high you rev this engine it just makes more noise. it makes a good kick past 6k but after 8000-8200 its pointless and just causing serious engine damage. It might handle 9k once but even if it did it 10 times its not going to last long. 10k im sure would fry the cast internals instantly.

[Tom1222]

Originally Posted by Wu36Ca

From what I have heard the v-tec kicks in at 7,800 rpm. Isn't the purpose of teh vtec defeated if you have to switch gears almost immediately after it is engaged?

You are both wrong.... The I-VTEC engages at 5800 rpm.
Check out this very interesting Video from Honda

http://world.honda.com/HDTV/news/2003-4031127a/
I know it is from the early 2003 I VTEC and it was first introduced in a Minivan but it is the same type of engines and concept as in our cars today.

[Tom1222]

Sorry Double Post

[BLU BY U]

Originally Posted by K20Z3Si

All of this dosnt matter because a new v6 rav 4 will beat us in 0-60 and 0-100 by 3 seconds... its a suv!

I have driven alot of fast cars and no matter how high you rev this engine it just makes more noise. it makes a good kick past 6k but after 8000-8200 its pointless and just causing serious engine damage. It might handle 9k once but even if it did it 10 times its not going to last long. 10k im sure would fry the cast internals instantly.

cast internals such as? the crank maybe, but everything else is forged.

[Tom1222]

Originally Posted by K20Z3Si

All of this dosnt matter because a new v6 rav 4 will beat us in 0-60 and 0-100 by 3 seconds... its a suv!

I have driven alot of fast cars and no matter how high you rev this engine it just makes more noise. it makes a good kick past 6k but after 8000-8200 its pointless and just causing serious engine damage. It might handle 9k once but even if it did it 10 times its not going to last long. 10k im sure would fry the cast internals instantly.

Actually the internals are suppose to be forged in the Si. At least that is what I heard and have seen here on the forums

[BLU BY U]

Originally Posted by Tom1222

Actually the internals are suppose to be forged in the Si. At least that is what I heard and have seen here on the forums

+10

[K20Z3Si]

Originally Posted by Tom1222

Actually the internals are suppose to be forged in the Si. At least that is what I heard and have seen here on the forums

The crank in 90% of cars is forged the rest is cast. even stis and evos have cast pistons.

[06redsi]

the OEM rev limiter is actually 8000 rpms, honda tachs are just abit off making it seem like you can shift at 8250 or so. hondatas reflash lets it go to 8600rpms so im guessing thats as high as you would really wana go on a daily basis with the stock valvetrain and bottom end, safely anyways.

[si_civic]

Originally Posted by dannyboy's06Si

Why would Hondata raise the rev limit to 8,600rpm?

Quote:

It is not designed to work with a stock 06 Civic Si and will lose power between 4500rpm and 5600 rpm if installed........Power is gained in the midrange from 4700rpm to 6300 rpm. Power gains above 6500 rpm are negligible, although the higher rev limit will raise average power a little.

[dannyboy's06Si]

+10 ^

[Rownan]

Like I said your average power goes up with a higher redline but it's not because you're making more power up there, it's because it allows you to make use of a wider powerband.

I doubt anything would melt in the k20 at 10k rpm, but under those conditions the camshafts are going to have major trouble closing the valves, and at that point they will in contact with the piston on the exhaust/compression stroke, catastrophically.

Here's a fun thread if you want to know what it would take to hit 10k in the k20.

http://forums.clubrsx.com/showthread.php?t=28681

[DAB2005]

beyond vale contact at around the 10k mark you would have already started to drop oil pressure around the 9k mark opening up your motor to spun bearings. hondata upped the oem rev limit to open up the power band. honda also ran the motor estremely rich up top which they helped correct with the reflash which allows for the power band to be extended into the higher rpm's. the valve train components inside the z3 head are more than adequate for rev'n up to 9k with oem camshafts andthing beyond that point would require an upgraded valve train as well as camshafts to make it worth while to rev that high

[dannyboy's06Si]

!!!!!!!!I had a wierd dream last night!!!!!!!!!

After all this talk of how high the Si can rev I had a dream, that I was driving my Si and the rev limiter did NOT kick in and the car tached out at 9k and about 5 seconds later the check engine light came on!!!!!!!!


Good thing it was only a dream!

[O6 Si]

at 10 the pistons have chance to hit the valves

[2RotorMotor]

Originally Posted by K20Z3Si

All of this dosnt matter because a new v6 rav 4 will beat us in 0-60 and 0-100 by 3 seconds... its a suv!

Lol I wanna see this..

I have driven alot of fast cars and no matter how high you rev this engine it just makes more noise.

You and alot of other people that have posted here, have no idea how an engine works and makes power... Just because it makes peak power @ 7800, doesnt mean there's no power after that... Farther you are next gear, the faster you will reach your peak power

it makes a good kick past 6k but after 8000-8200 its pointless and just causing serious engine damage

I would love know how its causing serious engine damage... would you like to elaborate?? The valvetrain is almost identical to that of s2ks, which as you know, rev to 9k... So again I ask, what serious enginge damage does it cause?

It might handle 9k once but even if it did it 10 times its not going to last long. 10k im sure would fry the cast internals instantly.

LOL again, you are just talking shit... PLease prove that to me or else you are just spreading misinformation...

[2RotorMotor]

Originally Posted by DAB2005

beyond vale contact at around the 10k mark you would have already started to drop oil pressure around the 9k mark opening up your motor to spun bearings. hondata upped the oem rev limit to open up the power band. honda also ran the motor estremely rich up top which they helped correct with the reflash which allows for the power band to be extended into the higher rpm's. the valve train components inside the z3 head are more than adequate for rev'n up to 9k with oem camshafts andthing beyond that point would require an upgraded valve train as well as camshafts to make it worth while to rev that high

Again, please make sure you know what you are talking about before posting your "thoughts as facts"... The reflash does not touch timing or fuel, so how did they manage to lean it out?? And what does rich/lean have to do with reving higher??

I do agree with you on one point... which Im not all too sure myself... But I have experience this on other cars, and thats the part about the oil pressure.. Oil pressure should go up as you rev higher untill the regulator opens up, but as the pump spins higher the pressure might drop from congestion(I cant remember if thats the right word)... And this does leave the possibility for spun bearings if the oil starvs up top... But there are mods you can to the pump for this...

[Halcyon819]

STOP STOP STOP!!!

Are any of you mechanics in here? Does anyone have actual FACTUAL INFORMATION to prove or disprove the max rpm the engine can take stock?

It just seems like you guys are basing your statements on what you "feel" and "think" the Si Engine can handle.

Like "O6 Si's" statement "at 10 the pistons have chance to hit the valves" and that's all he put in his post... it's just hard to believe that the post has any merit at all, especially coming from a 17 year old (which I will assume has little to no mechanical experience)

[dannyboy's06Si]

What we need is some one to replace the stock fuel rail, fuel pump, and injectors and somehow find a way to disconnect the rev limiter from all the components it controls such as the fuel system, ignition, intake system, and whatever else it runs, and see how far they can take it.

We can all donate $5 for their replacement engine.

[K20Z3Si]

Originally Posted by 2RotorMotor

Lol I wanna see this..



You and alot of other people that have posted here, have no idea how an engine works and makes power... Just because it makes peak power @ 7800, doesnt mean there's no power after that... Farther you are next gear, the faster you will reach your peak power



I would love know how its causing serious engine damage... would you like to elaborate?? The valvetrain is almost identical to that of s2ks, which as you know, rev to 9k... So again I ask, what serious enginge damage does it cause?



LOL again, you are just talking shit... PLease prove that to me or else you are just spreading misinformation...

I know that if you take it to 8400 you will be at a higher rpm in the next gear but is racing really worth the reliablity of your engine?

The S2000 is NOT the same engine in alot of ways. First off the current model redlines at 8k, it says so on hondas website. secondly it uses VTEC not i-VTEC dumbshit. thirdly the valvetrain is alot different from our 20k civic than the 30+ S2K's.

The redline is at 8k for a reason. It can handle being redlined alot but were beating a dead horse. Its all on how the driver shifts and treats the car on a daily basis. Someone who runs it to 8k all of the time and takes to to tracks in a stock state is not going to have the car last as long as someone who hardly ever redlines the enigne and drives it slowly.

some common sense facts:

The 2006 Honda civic Si is NOT a race car!

It's NOT made to be driven at around 4500 rpms while crusing around or left in 5th gear on the highway!


some people seem to think these things and are sadly mistaken. Its a sporty car thats made to last and get good gas mileage and be fun on nice sunny days.


and the rav 4 will beat the Si, I didnt like to read it but its true. It also beat the new Acura RDX witch temple of vtec seems to be a race car as well but it cant even go over 90MPH LOL!