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Discussion Starter · #1 ·
How many times have you bumped the rev-limiter on your I-4 manual trans?  4 times so far for me.  The rev limiter seems to kick in right around 6700 rpm.  When accelerating quickly in 1st gear it is easy to hit the limiter if you're not looking at the tach, especially since this engine is so smooth and keeps pulling all the way to and through redline.  I have been surprised every time I hit the limiter since the car was still accelerating nicely and I didn't pick up on any nasty vibes, harmonics, or change in engine demeanor that would have otherwise told me to shift.  In my past vehicles, a good computer tune moved the rev limiter up 500 rpm from stock and I think this car could handle a 7000 rpm limit but I don't want to chance any valve to piston contact...that could be bad, mmmkay. 
 
 

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I've tapped 7,000 once on my 3.0 with the auto -- but it's never done it again. I think it got confused, or something.
 

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I do not think that I have noticed hitting it. I am sure that I might have come close a few times though. Is it really noticeable?

In past vehicles I have noticed a distinct cut-off or slight bucking when hitting the rev-limiter.
 

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Discussion Starter · #4 ·
The rev limiter is more like a cut-off of fuel (the engine just seems like it dies) rather than the on-off power, rev-bang, rev-bang sensation that you get with some cars. I will probably never hit the rev limiter in any gear other than 1st. In 2nd gear and especially 3rd, there is no way that you would want or need to rev the I-4 manual that high. In 3rd even at 6000 rpm the engine sounds like it is going to self destruct (more noise than go) and there is no more power at 6000+ rpm than there would be if you shifted before that rpm. Shifting at 6000 rpm in 2nd gear brings you down to 5000 rpm in 3rd which is much closer to this engine's torque peak. But in 1st, with the short gear ratio, it passes through the rpm's so fast that sensation is not noticable. This engine has almost no power below 1800 rpm as a side note.

[quote author=captainhook link=topic=45545.msg695151#msg695151 date=1146571709]
I do not think that I have noticed hitting it. I am sure that I might have come close a few times though. Is it really noticeable?

In past vehicles I have noticed a distinct cut-off or slight bucking when hitting the rev-limiter.
[/quote]
 

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I have noticed that in the 3.0 when you take off real fast it raps the engine out pretty bad.
Even when you are driving about 30 or 40 and you get into the gas and it down shifts it revs up pretty high then too.
I think it revs up way to high to be good for the engine when you try to get into the gas to hard.
 

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At 30 it isn't bad, it only goes down one gear. 40 on the other hand, it still only goes down one, but it's at the very end of that gear.

Taking off from 0, 1st winds out REAL fast, almost too fast.
 

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[quote author=swoop1156 link=topic=45545.msg703628#msg703628 date=1146846165]
At 30 it isn't bad, it only goes down one gear.  40 on the other hand, it still only goes down one, but it's at the very end of that gear.

Taking off from 0, 1st winds out REAL fast, almost too fast.
[/quote]


The old 5 spd Auto's in the Mazda 6's had a long first gear and was noticeable slower to 60mph. These new 6 speeds are faster off the line due to the fact that first is a "shorter" gear. The 3.0L engines aren't the greatest in power by a long shot, but the new trannys help alot! You want first gear like that!!!
 

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I've bumped it a few times passing cars. I think it's somewhere around 6700 like has been said. Personally, I think it's too low. The 4 banger makes real good power in the higher rpms.

SHOguy, how many ex V8 SHO guys do we have here?! I got rid of mine a few years ago but might actually be buying it back.
 

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Discussion Starter · #9 ·
I think with a good tune and a CAI, this car would benefit a 7000rpm limit. Most cars can safely handle a 2-300rpm increase over the stock limiter setting, some like as much as a 500rpm increase.

The V8 SHO's were nice looking cars. Were they any quicker than a V6 Fusion or the old SHO V6 manuals?


[quote author=Showtime link=topic=45545.msg707487#msg707487 date=1147050023]
I've bumped it a few times passing cars. I think it's somewhere around 6700 like has been said. Personally, I think it's too low. The 4 banger makes real good power in the higher rpms.

SHOguy, how many ex V8 SHO guys do we have here?! I got rid of mine a few years ago but might actually be buying it back.
[/quote]
 

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[quote author=Showtime link=topic=45545.msg707487#msg707487 date=1147050023]
I've bumped it a few times passing cars. I think it's somewhere around 6700 like has been said. Personally, I think it's too low. The 4 banger makes real good power in the higher rpms.

SHOguy, how many ex V8 SHO guys do we have here?! I got rid of mine a few years ago but might actually be buying it back.
[/quote]

It seems like there are quite a few SHO guys here. The Fusion seems just as much fun as our V8 SHO's....well...almost. Atleast there is the 5 speed manual option!
 

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[quote author=aninjazx6r link=topic=45545.msg702806#msg702806 date=1146803080]
I have noticed that in the 3.0 when you take off real fast it raps the engine out pretty bad.
Even when you are driving about 30 or 40 and you get into the gas and it down shifts it revs up pretty high then too.
I think it revs up way to high to be good for the engine when you try to get into the gas to hard.
[/quote]

it's better for an engine to rev high than it is to lug down.

and it's a 3.0, you're not going to break it just mashing it. That engine will last at least 150k miles with normal maintenece
 

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My 3.0 SEL has a rev limiter for neutral/park as well. Its much lower like 3or 4k or so.

I also noticed another odd thing when holding the engine revs up in drive with the brake applied (yeah I know a bad idea to do for too long). I think the computer pulled back on the revs, but I'm not sure. I was only holding it for a little bit, and was done with my test right when the revs fell off and I didn't want to do it again cause it took several long seeming seconds before the event occured.
 

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[quote author=swoop1156 link=topic=45545.msg692863#msg692863 date=1146499602]
I've tapped 7,000 once on my 3.0 with the auto -- but it's never done it again.  I think it got confused, or something.
[/quote]
You're saying the engine started screaming, "ahh ahh fire! blow on it!"?
 

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Yeah, pretty much. I hit a teeny-bit of loose gravel and began spinning and then that transferred to pavement, when I hit 7,000.
 
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