Guys, is it possible for the engine's maximum rpm to increase after performance parts have been added? If so, can this be determined after a dyno?

Since all factory ECUs come with a rev limiter, there is no way to increase your rev limit other than changing your factory ECU or reprogram it if it is a programmable one.

at sir nagiiba lang ho ang redline kapag naincrease na din ang load capacity ng internal parts lalo na con rods at valve springs, valve seats, piston pins etc pati na din blue printing. at di siguro malalaman sa dyno ang added stress tolerance ng bagong parts

Quote from: BlackBlood on November 01, 2004, 12:31:12 AM
at sir nagiiba lang ho ang redline kapag naincrease na din ang load capacity ng internal parts lalo na con rods at valve springs, valve seats, piston pins etc pati na din blue printing. at di siguro malalaman sa dyno ang added stress tolerance ng bagong parts

Squalastic, there is NO way in this world that will push your redline further if you add performance parts EXCEPT for an engine management (i.e. Hondata), re chipped ECUs or Rev-Speed Meter and the like.
There is NO logic in adding "performance parts" and having a higher redline because redline or engine cutoff is controlled by your car's computer box (that is if you car is fuel injected).
And NO you don't need to go to the dyno to know if your redline has gone up because you can just do that by reving your engine until it (fuel) cuts off.
Blackblood, what in the world are you talking about when you said "nagiiba ang redline kapag naincrease na din ang load capacity ng internal parts"!?!?  Even if your car's ENGINE was blueprinted and your factory ECU NOT changed or modified, you'll ALWAYS have the same redline or engine cutoff.

I am aware of this so-called rev limiter. It's something like the governor limiting the top speed of some cars, and AFAIK, it can be adjusted with the right equipment.

As for the engine cut-off, I think that some cars are not equipped with this. I'm not sure, but in the owner's manual, you are told not to go beyond the red zone as it may cause severe engine damage. Pls. correct me if I'm wrong.

granted you do not have a rev limiter to cutoff ignition or fuel, you cannot determine "redline" on a dyo. the dyno can tell you where in the rpm range youre getting max torque and hp but it doesnt tell you where your redline is.
"redline" or max rpm without damaging your engine depends on:
valvetrain: basically, when valve float occurs
maximum piston speed: depends on quality of your bottom end, pistons and rings, "rod ratio" ( undersquare or over square or such)
fuel system: is your fuel system enough to cope with the higher rpm.
ECU redline is an artificial redline and not the true redline of an engine.

Quote from: squalastic on November 01, 2004, 01:27:03 AM
I am aware of this so-called rev limiter. It's something like the governor limiting the top speed of some cars, and AFAIK, it can be adjusted with the right equipment.

As for the engine cut-off, I think that some cars are not equipped with this. I'm not sure, but in the owner's manual, you are told not to go beyond the red zone as it may cause severe engine damage. Pls. correct me if I'm wrong.

If you are already aware of this "so called rev limiter.." why did you even have to start this thread? What do you want to know? BTW, what car is this you want to modify?

Quote from: squalastic on November 01, 2004, 01:27:03 AM
I am aware of this so-called rev limiter. It's something like the governor limiting the top speed of some cars, and AFAIK, it can be adjusted with the right equipment.

As for the engine cut-off, I think that some cars are not equipped with this. I'm not sure, but in the owner's manual, you are told not to go beyond the red zone as it may cause severe engine damage. Pls. correct me if I'm wrong.

Alam mo naman pala bakit ka pa nagtatanong?
Just to enlighten you and to "correct you because you are wrong",  ALL FUEL INJECTED CARS HAVE REV LIMIT or CUT OFFs  because of its stock factory ECU program.
I am also very much intrigued by your statement of adjusting the redline with the "right equipment". The only way the rev limit can be altered is through re-chipped ECUs, Rev-Speed Meter (Apex-I) and the like. Can you expound on what "equipment" you are talking about?
And what is this analogy about "governor limiting the top speed "? Before you gave similarity about the human body, now what the hell is this "governor" thing?!?!
If you're trying to enlighten us with your "knowledge" please be technical and avoid confusing us with analogies with governors and the human body. It is not only confusing and unhelpful but at the same time irritating.

tama sila ChampWht. all engines will have rev limits... not all may have speed limiters (or governors as you call them) pero those will normally be limited by aerodynamics, power or gearing...

squalastic, the only equipment that can adjust the rev limit is a rechipped ecu or a standalone unit like what was mentioned.

ChampWht, can the apex'i RSM adjust the rev limit? alam ko this only displays rpm's, speed and other stuff like top speed, etc... kumbaga monitoring device lang. you may be referring to the power FC which is the standalone unit that can adjust fueling, timing, vtec, max rpm and boost (assuming kasama yung boost kit). just wondering...  

Quote from: speedyfix on November 01, 2004, 02:54:34 PM
tama sila ChampWht. all engines will have rev limits... not all may have speed limiters (or governors as you call them) pero those will normally be limited by aerodynamics, power or gearing...

squalastic, the only equipment that can adjust the rev limit is a rechipped ecu or a standalone unit like what was mentioned.

ChampWht, can the apex'i RSM adjust the rev limit? alam ko this only displays rpm's, speed and other stuff like top speed, etc... kumbaga monitoring device lang. you may be referring to the power FC which is the standalone unit that can adjust fueling, timing, vtec, max rpm and boost (assuming kasama yung boost kit). just wondering...  

Speedyfix, I don't know if the RSM can adust rev limit but what I do know is that it eliminates the top speed limit for some engines such as the JDM B16A, which is 180kph. After elimination of top speed limiter, you can go as fast as your engine can push it. And what you said is true, gear ratio and aerodynamics will also play a factor.

Quote from: ChampWht on November 01, 2004, 01:38:41 PM
Alam mo naman pala bakit ka pa nagtatanong?
Just to enlighten you and to "correct you because you are wrong",  ALL FUEL INJECTED CARS HAVE REV LIMIT or CUT OFFs  because of its stock factory ECU program.
I am also very much intrigued by your statement of adjusting the redline with the "right equipment". The only way the rev limit can be altered is through re-chipped ECUs, Rev-Speed Meter (Apex-I) and the like. Can you expound on what "equipment" you are talking about?
And what is this analogy about "governor limiting the top speed "? Before you gave similarity about the human body, now what the hell is this "governor" thing?!?!
If you're trying to enlighten us with your "knowledge" please be technical and avoid confusing us with analogies with governors and the human body. It is not only confusing and unhelpful but at the same time irritating.

FYI, I was pertaining to the true "redline" of the engine, as in how far it can really go, not the limit to which the ECU was programmed nor what the tachometer says.

For the adjustments, what equipment you say? I think you just mentioned it yourself (APEXi, blah blah blah).

As for the 'governor,' what's so confusing about it. Ok, for your sake, I'm not talking about the governor position in politics, but the thing that restricts some cars to a certain top speed (usually 250 km/h in German cars except Porsche). I hope that is no longer confusing for you.

And now, where in this thread did I talk about the human body?

Quote from: squalastic on November 01, 2004, 10:15:10 PM
FYI, I was pertaining to the true "redline" of the engine, as in how far it can really go, not the limit to which the ECU was programmed nor what the tachometer says.

"True" redline??

-RPM limits are always determined by the cars ecu!
-The tachometer is the only instrument designed to monitor engine RPM!

Who are you to question the engineering of the ecu and the accuracy of the tachometer? What are you really talking about? You started this thread, what do you want to know?

ChampWht, yeah alam ko nga the rsm removes the speed limiter:) it a good solution to the jap speed limited boxes...

the true redline of the engine? this can only be determined by removing the limiter then revving the engine till it blows. that will be the true redline of the engine.

of course, that's precisely why the box is there... para di sumabog yung makina. medyo mahirap siguro explain sa mayari ng auto kung bakit sumabog makina nya right?

i think it' just proper to clarify that a speedlimit is very much different from the from the redline limit.

it seems that some people are confusing both...

i believe that the thread pertains to the rev limit, rather than the speedlimit, so i confuses me, why some suggested a "tool" that allows the removal of the speedlimit, but he wasn't sure if it allowed the raising of the revlimit...

in a true sense, the only way to remove or modify the revlimit is to bypass the ecu, or to trick it with other piggyback controller's, but not all of this allow revlimit removal, and ofcourse, the full programable ecu's, and reprogrammed chips, or a full programed ecu like spoon's, mugen's, etc.

Now having to safely raise revlimits is entirely a different story all together

Quote from: BlackBlood on November 01, 2004, 12:31:12 AM
at sir nagiiba lang ho ang redline kapag naincrease na din ang load capacity ng internal parts lalo na con rods at valve springs, valve seats, piston pins etc pati na din blue printing. at di siguro malalaman sa dyno ang added stress tolerance ng bagong parts

hmmm baka increasing the powerband ang gsto mo ibahin hindi redline....