Why the difference in RPM redline between 95-96 and 97-99?

[jkrause]

why do some dsm's have a redline of 7500 and others have 7000, when its the same motor....specifically the 95-96 have a redline of 7500 where as the 97-99 redline at 7000

 

[Spyderman7]

It's probably because the manufacturer has to replace less engines under warrantee when their shifted at 7000 rpm as opposed to 7500 rpm shifts.

 

[Pure92TSi]

Mitsubishi honor a warranty? That's a joke. They would probably tell you something like well apparently you have pressed the throttle all the way to to floor so your warranty is void.

 

[Dorifto]

I would suspect it's the same reasoning Toyota used, to lower the rev-limiter on the late-model Celicas to 7800, as opposed to 8200 - which is, missed shifts. Supposedly, it's easier to pop a motor with a missed shift at higher rpm, than it is bouncing off a lower rev-limiter.

[EDIT: I re-read what I typed, and then figured out I'm an idiot. A missed shift at higher rpm overrevs the engine higher - say, if you redline at 7500 and you hit 2nd instead of 4th - let's say it brings your revs up to 9500. Now, say you redline at 8500, and the above happens - it overrevs your engine to 10,500! That's enough to grenade lots of piston engines, hell, even a couple rotary engines.]

Assuming that there were no mechanical changes and only electronic governing changed, 7500 should be cake for those marked at 7k. I know for a fact my GS-T redlines at 7600 [EMS programmed], even though the stock tach reds at 7k.

-Dave-O

 

[gsturboman]

i agree with dorifto, thats propably why they did that. yeah, hitting 10500 rpms would not be fun wither, which is why they turned it to 7k. it might still hit 7500 but the tach just reads 7k so you wont over rev it?who knows for sure? my mx6 DD redlines at 7k but i can still pick up speed at 7500. thats a good question to look into there.

 

[wret]

Guys, try to remember that this is a technical forum. If you find yourself using words like "probably," "maybe," "I think" or "IMO" you shouldn't post. Of course there are places for theoretical discussions and conjecture but this isn't one of them.

 

[asexton6969]

I understand what your saying Wret, but its better to lay out a theory. Someone can always come along later if they know the correct answer and clearly state it. They are just giving their theory so that the topic starter can have somewhat of an idea of what it might be. No harm, the first thing i noticed was that they said probably and maybe. So i wouldnt take what they said to heart. No disrespect, just stating my opinion.

 

[Auto12]

I understand what your saying Wret, but its better to lay out a theory. Someone can always come along later if they know the correct answer and clearly state it. They are just giving their theory so that the topic starter can have somewhat of an idea of what it might be. No harm, the first thing i noticed was that they said probably and maybe. So i wouldnt take what they said to heart. No disrespect, just stating my opinion.

Agreed.

Theorys do no harm, as long as its stated that it is a theory and not fact.

 

[MyBeatGSX]

Ok I got a theory that should be obvious.... When's the last time you've seen a DSM that isn't highly modified actually making power that high? Who needs an extra 500rpm of stress when power starts falling hard after 6,500rpm and torque has been falling for quite some time before that?

 

[Defiant]

My money's on the factory tach not being within 500 rpm of accuracy at 7K in the first place.
If we could find out, it's probably that someone effed-up the order on the second batch of tach faces. Or, the first.