ISSUE: 1900-2000 RPM Shutter/Shaking (Free load)

[Silp3]

I get the shake. And have for at least 1000 miles now. I wanted to keep an eye on it. Mine starts at 1500rpm and continues to 2000.

Also when in first gear and starting from a stop while turning left or right, there is a wiggle/wobble from the rear end. Thought of the differential and the thought that maybe t was lacking fluid. Or it may be a loose or defected center support bearing/guibo for the drive shaft

[COLGATE]

so op you have any update on the issue?

[chaoskaze]

I think the 6th in our car need to be longer , it's too noisy for an overdrive lol, but ya the car don't like u to drive below 2k unless u are coming to a stop.

I find changing the fluid makes it less tempered.

[carma143]

I often drive 35 mph in 6th gear, cruising only. Anything below that and the car shudders and fails trying to achieve positive acceration. Any realistic acceleration is done in 5th, 4th, 3rd, or 2nd (If I really need to 'go').

I've heard that applying gas at low rpms can hurt the engine.

I have this friend in college who is always complaining how I drive my car, telling me things like "keep the rpms between 1-2k when cruising, never go above 3k when accelerating". Everytime I just have to tell him "It's a sports car. It drives differently." Funny thing is that he once tried to drive it, stalled 6 times driving down a block, and called quits.

[carma143]

Originally Posted by Silp3

I get the shake. And have for at least 1000 miles now. I wanted to keep an eye on it. Mine starts at 1500rpm and continues to 2000.

Also when in first gear and starting from a stop while turning left or right, there is a wiggle/wobble from the rear end. Thought of the differential and the thought that maybe t was lacking fluid. Or it may be a loose or defected center support bearing/guibo for the drive shaft

I get that as well. I take it as part of the style of the car. In 2nd gear you can easily go from 1.5k to 7k, hearing the cool shuddering noises at the low end, and then the spittering roar past 3.5k.
Edit: I apply low throttle at the "shuddering" rpms.

Of course, I have an Invidia exhaust system, so that might add to the resonating in the lower end.

[Dammod]

Originally Posted by carma143

I often drive 35 mph in 6th gear, cruising only. Anything below that and the car shudders and fails trying to achieve positive acceration. Any realistic acceleration is done in 5th, 4th, 3rd, or 2nd (If I really need to 'go').

I've heard that applying gas at low rpms can hurt the engine.

I have this friend in college who is always complaining how I drive my car, telling me things like "keep the rpms between 1-2k when cruising, never go above 3k when accelerating". Everytime I just have to tell him "It's a sports car. It drives differently." Funny thing is that he once tried to drive it, stalled 6 times driving down a block, and called quits.

Yeah man, don't do that at all.

Lugging the engine puts sever strain on components, don't be scared to let the revs climb. I'd try keep it over 2k (unless you are pulling away from a stop of course), and when going up hills, closer to 3k...

You want the car to feel like its pulling you along freely as apposed to struggling to accelerate with large throttle input.

If its fuel consumption you are concerned about, you could be doing more harm than good on that front too, as throttle position plays a big part in fuel consumption.
Rather have the revs a little higher with less throttle input than lower revs with more throttle.

[carma143]

Originally Posted by Dammod

Lugging the engine puts sever strain on co throttle.

Oh, I only go 35 mph on 6th gear on a flat terrain with my foot barely touching the throttle. Anymore throttle than that and the engine starts to feel and sound like it's lugging, though it does accelerate (which is why I go to a lower gear to accelerate). Typically though I'm more in the low 40s.

[mo420]

My 86 also shudders when free revving at Park/Neutral around the 1500 - 2000 RPM range..glad to hear I'm not alone with this... did the OP ever get to the bottom of this 'issue'? Probably its just another characteristic of these boxer 4-pots that we have to get used to, I guess... the 'normal resonance' suggestion seems quite legit though...

[ShadowReaper]

Can you say... Thread Revival.

My 2015 BRZ has the same symptoms. I have a Southbend clutch, since 2017 and I have never had an issue, about 2 weeks ago my car started shaking when shifting into 1st gear. So I thought it was low Transmission fluid and I changed it. Still does it, if not worse.

Just today I noticed that if I shift into 1st gear below 2000 RPM it will shake violently but if it's 2000 RPM and above everything is fine.

I also kept hearing a metallic...I wanna say "tap" because it wasn't low-pitch for a "clunk". It happens when I drop my clutch. Thoughts?

[Tcoat]

Originally Posted by ShadowReaper

Can you say... Thread Revival.

My 2015 BRZ has the same symptoms. I have a Southbend clutch, since 2017 and I have never had an issue, about 2 weeks ago my car started shaking when shifting into 1st gear. So I thought it was low Transmission fluid and I changed it. Still does it, if not worse.

Just today I noticed that if I shift into 1st gear below 2000 RPM it will shake violently but if it's 2000 RPM and above everything is fine.

I also kept hearing a metallic...I wanna say "tap" because it wasn't low-pitch for a "clunk". It happens when I drop my clutch. Thoughts?

Time for a new clutch.

[ShadowReaper]

Originally Posted by Tcoat

Time for a new clutch.

What makes you say the clutch needs to get replaced. Not questioning your knowledge, I'm just asking because I don't slip gears, I have no issues with engaging into other gears at different loads. Would those symptoms rule out TOB, pressure plate pressure, clutch shatter (however the hell you spell it)?

[Tcoat]

Originally Posted by ShadowReaper

What makes you say the clutch needs to get replaced. Not questioning your knowledge, I'm just asking because I don't slip gears, I have no issues with engaging into other gears at different loads. Would those symptoms rule out TOB, pressure plate pressure, clutch shatter (however the hell you spell it)?

"Stutter"

That is the awkward thing about clutches. They may work fine under X conditions but not Y. Each can fail differently then another. It is where I would start at least since it could indeed be any of the parts you mentions and I just sort of group them in the term "clutch". Oh and just do the TOB when you have it opened up anyway. Those may as well be a do it every time in there item.

[Tcoat]

Originally Posted by carma143

I often drive 35 mph in 6th gear, cruising only. Anything below that and the car shudders and fails trying to achieve positive acceration. Any realistic acceleration is done in 5th, 4th, 3rd, or 2nd (If I really need to 'go').

I've heard that applying gas at low rpms can hurt the engine.

I have this friend in college who is always complaining how I drive my car, telling me things like "keep the rpms between 1-2k when cruising, never go above 3k when accelerating". Everytime I just have to tell him "It's a sports car. It drives differently." Funny thing is that he once tried to drive it, stalled 6 times driving down a block, and called quits.

Anything lower then 6th causes the car to shudder? Something dreadfully wrong with that statement.
Applying gas at low RPMS hurts the engine? Only if you are in too high a gear and lugging it. Such as 6th at 35MPH.

[Lantanafrs2]

And people wonder why manuals are becoming rare.