Hey guys I was wondering how high I can rev my car to with the stock valvetrain. I have a skunk2 ecu, so I am just shifting at 8000 now, but I was wondering what anyone on here has done. Just curious...Thanks...

 

8500 safely

 

8k safely. anything above that is a risk.

8k after all is the redline.

 

you gotta understand it depends on the cams as well. you cant just slap on some junIII cams on GSR valvetrain and expect it to handle 8Krpms.. it also depends on the lift.

 

Im runnin' a jdm gsr w/hondata I'd say shift at 8200 anything above that could be bad.

 

GSR valvetrain is capable up to 8400 rpm and no more..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ej0513 &raquo;</TD></TR><TR><TD CLASS="quote">GSR valvetrain is capable up to 8400 rpm and no more..</TD></TR></TABLE>

yeah but shifting higher won't help you unless you want a problem sooner, which it seems if you can't get valvetrain that only cost about 280 or so imagine dropping a valve on a mishift due to valve float? expensive trust me

 

I know that Im digging this post up from the dead but I rev my JDM B18C above 8000 rpms and my rev limiter is set at 8400 and I have had no problems and the car runs awesome.

 

I wouldn't really rev it past 8200. After that point power is dropping off with stock cams. Most will handle 8500 fine but you don't wanna do it regularly. I used to rev my JDM GSR w/ CTR intake cam and stock valvetrain to 8600 but I didn't realize i was taking it that high. I just shift it at 8-8200

 

Don't take it past 8k, there's really no reason to anyway on stock cams. Bending valves is not fun... I know from personal experience.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ringgold &raquo;</TD></TR><TR><TD CLASS="quote">I know that Im digging this post up from the dead but I rev my JDM B18C above 8000 rpms and my rev limiter is set at 8400 and I have had no problems and the car runs awesome. </TD></TR></TABLE>

Just wondering why? It can't be that much better in those 400 RPM's as it would to shift and get back into the powerband.

 

Well I dont know how the GSR valvetrain cant handle a few hundred more rpm's being the the intake valvesprings are the same as ITR exhaust valvesprings and they I know for sure handle more. The exhaust is a little weaker but cant be that much. Anyways I only rev it that high to fall back into the power band and it seems to do great.

Oh by the way how long did it take to break valvesprings and bend valves and what not reving your stock JDM GSR with the CTR intake cam on stock GSR valvetrain?

 

8400 is where i bent all 16 of my valves....

 

Thats cool cause 8400 is where I hit my rev limiter by accident the other night and my car ran awesome and still does. How do you bend all 16 valves from reving to 8400 rpms? Like I said the intake valve springs on a GSR are the same as the ITR exhaust valve springs? They are made to rev higher than 8400 rpms?

 

one word....BOOST thats how they bent

 

So the Boost bent your valves and not revving a little past stock rev limit.

OK

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ringgold &raquo;</TD></TR><TR><TD CLASS="quote">Thats cool cause 8400 is where I hit my rev limiter by accident the other night and my car ran awesome and still does. How do you bend all 16 valves from reving to 8400 rpms? Like I said the intake valve springs on a GSR are the same as the ITR exhaust valve springs? They are made to rev higher than 8400 rpms?
</TD></TR></TABLE>

You are forgetting something VERY important. Not only did Honda upgrade those valvesprings, they also lightened the intake valves as well. The valves alone attributed for 200rpms of the increase in redline between a type r and a gsr. There is a little more to it then just springs also when considering the ole "How high can my car rev"... Keep in mind LIFT and durration play a very key role in this. Add more lift and you just increased the change of coil bind. Change the ramps on the cam to close quicker then ITR cams and you also just increased the chance of valvefloat. You cannot just assume that since an ITR can hit 8,400rpms that the springs are good to that point no matter what. Look at the WHOLE picture, not just the parts you want to see.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid93Eg &raquo;</TD></TR><TR><TD CLASS="quote">

You are forgetting something VERY important. Not only did Honda upgrade those valvesprings, they also lightened the intake valves as well. The valves alone attributed for 200rpms of the increase in redline between a type r and a gsr. There is a little more to it then just springs also when considering the ole "How high can my car rev"... Keep in mind LIFT and durration play a very key role in this. Add more lift and you just increased the change of coil bind. Change the ramps on the cam to close quicker then ITR cams and you also just increased the chance of valvefloat. You cannot just assume that since an ITR can hit 8,400rpms that the springs are good to that point no matter what. Look at the WHOLE picture, not just the parts you want to see.</TD></TR></TABLE>

You are right with this stuff but then why is there people that I know of that take their stock ITR valvetrain to 9000 rpm all the time? Their cars are still running fine. Im not saying its the most healthy thing for the valvetrain but Im saying it cant hurt it that bad if you are not doing it constantly. Im only above 8000 rpms on my car for a second or so until I shift gears. I know that Im not really making any power above that point but Im doing it because my revs fall back into a good spot on my power band or so it seems.

 

i used to take it 9k no problem..with ctr intake cam,,,people say im stupid but o well...it's my car..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ringgold &raquo;</TD></TR><TR><TD CLASS="quote">

You are right with this stuff but then why is there people that I know of that take their stock ITR valvetrain to 9000 rpm all the time? Their cars are still running fine. Im not saying its the most healthy thing for the valvetrain but Im saying it cant hurt it that bad if you are not doing it constantly. Im only above 8000 rpms on my car for a second or so until I shift gears. I know that Im not really making any power above that point but Im doing it because my revs fall back into a good spot on my power band or so it seems. </TD></TR></TABLE>

We can sit here all day long and play this game. Why did Honda spend the extra money in changing these parts out and then put the revlimiter where they did? They obiously felt a need.

 

Yeah they also sold these cars to anyone who bought them and probably thought that ehh for the GSR we will put it at 8000 rpms or whatever and for the ITR 8500 sounds nice since alot of these cars are daily driven and Im sure that reving on a daily basis above the stock rev limiter is a bad idea dont get me wrong.

All Im trying to say is Im sure that Honda didnt engineer these cars that perform really well and the engines have a good reputation for lasting quit awhile and stick valvetrain parts in there that are inferior and couldnt handle a little more abuse than the stock rev limit. Im sure my reving 200-400 past the stock rev limit isnt hurting my engine anymore than someone that has an engine with a ton of miles on it still reving the life out of it? Besides I dont drive my car daily nor do I race it all the time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ringgold &raquo;</TD></TR><TR><TD CLASS="quote">Yeah they also sold these cars to anyone who bought them and probably thought that ehh for the GSR we will put it at 8000 rpms or whatever and for the ITR 8500 sounds nice since alot of these cars are daily driven and Im sure that reving on a daily basis above the stock rev limiter is a bad idea dont get me wrong.

All Im trying to say is Im sure that Honda didnt engineer these cars that perform really well and the engines have a good reputation for lasting quit awhile and stick valvetrain parts in there that are inferior and couldnt handle a little more abuse than the stock rev limit. Im sure my reving 200-400 past the stock rev limit isnt hurting my engine anymore than someone that has an engine with a ton of miles on it still reving the life out of it? Besides I dont drive my car daily nor do I race it all the time. </TD></TR></TABLE>

He's got a point.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ChaseIntegra &raquo;</TD></TR><TR><TD CLASS="quote">

He's got a point.</TD></TR></TABLE>

I think that I do also haha

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ringgold &raquo;</TD></TR><TR><TD CLASS="quote">Yeah they also sold these cars to anyone who bought them and probably thought that ehh for the GSR we will put it at 8000 rpms or whatever and for the ITR 8500 sounds nice since alot of these cars are daily driven and Im sure that reving on a daily basis above the stock rev limiter is a bad idea dont get me wrong.

All Im trying to say is Im sure that Honda didnt engineer these cars that perform really well and the engines have a good reputation for lasting quit awhile and stick valvetrain parts in there that are inferior and couldnt handle a little more abuse than the stock rev limit. Im sure my reving 200-400 past the stock rev limit isnt hurting my engine anymore than someone that has an engine with a ton of miles on it still reving the life out of it? Besides I dont drive my car daily nor do I race it all the time. </TD></TR></TABLE>

It only takes once to float a valve and you engine is gone. Costly repairs will be needed if you kiss one of those valves to the pistons... I have seen a completely stock engine that was brought just a touch over the stock redline kiss all 8 exhaust valves before. Logic tells me that the desgin of the valvetrain is NOT intended to go beyond its stock limit. In theroy, there wouldn't be any reason to over engineer the valvetrain. You keep doing what you want and thinking you have a "point" about how it should be able to handle x amount over the stock limiter and that a "quick" trip there isn't going to hurt anything. Fact of the matter still remains. It CAN cause damage to go beyond the stock limiter, you ARE cutting corners by not changing the valvetrain out, it WILL cost a lof of money when you float a valve, and people should NOT assume that this is an intelligent idea by any means.

 

Well I could swap out my stock valvetrain for just 400 rpms above stock limit but then again I have actually probably read more posts about someones expensive aftermarket cams breaking, or their expensive aftermarket valvesprings failing some way, and of course their expensive aftermarket valves mushrooming out where they meet the rocker. Im not saying that I couldnt float the valves or anything of the sort on my stock valvetrain. Im just saying that Honda in my eyes probably did over engineer the valvetrain slightly. That is why I have part of an ITR valvetrain in my engine now stock. If you ask me an ITR is a factory built race car. I dont think they would set the rev limit to 8500 rpms or whatever its set because the valvetrain wasnt engineered to handle that and then some. I think it was set there because these cars were also designed to be driven on a daily basis like any other car that is sold to the general public.

I have read more stories about someones aftermarket valvetrain failing them some way rather than someones stock valvetrain failing them for a slightly higher than stock rev limit. Honda stock parts are fairly strong thats proven anyone that is really an enthusiast on this board should know that. I made a post just a few days ago or so about any horror stories that anyone has experienced personally or know someone that has about their stock GSR valvetrain failing them with a 400 rpm higher rev limit. Not one person has told me anything of the sort instead they tell me that my car's engine is gonna grenade and that Im bringing an early death to it. I dont drive my car daily nor do I rev it to 8400 rpms daily. I just dont think there is that big of a problem with it on a Bseries engine. Thats my opinion and Im sticking to it for now