I've screwed up a couple of times and redlined my 06 MSC in first. Is there a rev-limiter installed, or am I floating the valves? I'm sure if I don't change my ways something bad will happen..

 

There's a rev limiter - it'll bounce off if you go too deep into redline.

 

Thanks, sometimes I get a little nuts with the foot and forget.

 

does anyone happen to know where the rev limiter is on the MCS?

 

Stock is 6750, I believe.

- Matt

 

6850, almost 100% sure. As long as you dont go way past redline (IE: down shift when you should be up shifting) you shouldn't have any problems.

 

This topic has already been discussed on here several times; the rev limiter is set at 6950, but you can momentarily go beyond that and rev just beyond 7000rpm.

IMO, daily redlining of your engine at the factory limit is fine. On a factory head, the valves don't begin to float significantly until 8000+ rpm.

 

Please don't take this the wrong way, but would you mind letting everyone know how you know that the valves don't begin to float until 8000+ rpm?

 

Understandable question. For I have never done any research or testing myself . I guess that I have just been on NAM for too long...I recall reading the 8000 limit from a few older threads.

You re-stirred my interest in this particular subject and I did some searching. Isn't learning great! My new conclusion is that there is no exact answer, but significant floating starts to occur somewhere between 7200 and 8125 rpm, with 8000 being the mode.

Some people claimed that floating occurs as early as 6000rpm! Others argue that its not worth upgrading to heavier springs unless you plan on going over 8000rpms. Here is the thread that I am referring to:

https://www.northamericanmotoring.co...ighlight=float

Most the guys posting in that thread really know what they are talking about and are all "experts" in my book (SteveCars60, Johan, herbie hind, obehave, dmh).

Some additional supporting info:

You will probably find these interesting...

Thread: "Higher Revs"
https://www.northamericanmotoring.co...ighlight=float

Thread: "8500 RPM's ???"
https://www.northamericanmotoring.co...ighlight=float

Thread: "Valvetrain"
https://www.northamericanmotoring.co...ighlight=float


Every year the technology improves and by time I finally decide on a favorite head, some other vendor comes out with a better one!

 

good info, cooper99 - thanks

 

Redline on my car is somewhere around 6800rpm. Rev limiter kicks in at 7200rpm. I only tested that out once .

 

I have yet to hit my rev limiter...maybe I should...you know...just to do it once...

 

OK..so if you read this thread: https://www.northamericanmotoring.co...ighlight=float

and if in particular you read this post:https://www.northamericanmotoring.co...ighlight=float,
Brain1.0...of FTR...is referring to a 7250 rpm.

And if you read this post by the FTR employee: https://www.northamericanmotoring.co...4&postcount=12
...you'll see that Fireballed does not like the higher rev limits.

BTW, I have my car tuned with extended rev limit by the guys that do the tunes for FTR.

And here's a post about ingsoc regarding this topic: https://www.northamericanmotoring.co...5&postcount=19

If you want to run to 8000/8000+, be my guest

 

hehehe
GIAC's rev limiter is at
7600RPM
i think
WOOOOO YEA

 

in my old car, the rx-7, redlining keeps the rotary engine healthy

 

Occasionally reaching higher revs can burn out carbon deposits and other things that have detrimental effect.

 

Thanks for the information in your last post. I agree that running much above 7k rpm on stock valvetrain is risky and not something that I would want to do. However in this thread, we haven't been discussing the issues of raising your rev limiter, but trying to determine when the valves begin to float; which I still believe is somewhere around 8k rpms based upon those previous threads.

What's your rev limit set at with your custom tune?

You could be right, but my GIAC software set the rev limiter at 7200 rpm. Why don't you redline your car one time and find out where it cuts off?

7200 rpm? Wow, are you sure?

 

I feel that the oil pump might not be able to keep the engine oiled at higher than stock rev limits if even that.

 

I hit mine almost everytime I drive the car, after all this time I still have a tendancy to shift from 1st to 2nd late when I'm accelerating hard.

 

[/quote]
You could be right, but my GIAC software set the rev limiter at 7200 rpm. Why don't you redline your car one time and find out where it cuts off?
[/quote]

well thats something i will do sunday then, another MINY meet thats going up to conneticut, nice open roads