Obioban's 2005 IR/IR Coupe

[Obioban]

Interesting. 125k on mine, so I think it could use a refresh. Now I want to drive a higher mileage car with a refreshed diff to see what that feels like.



That's good to hear.

And maybe "extra notchy" is not the best way to describe it. What I'm talking about is the feeling that happens when you try to switch gears fast and don't let the drivetrain "settle". The shifter becomes harder to push into the gate and when it finally does go in, you can feel the drivetrain clunking through the shifter. Doesn't happen on every fast gear change, but it happens often enough to be annoying.

I think you both have convinced me to start planning a diff refresh. Need to spend some time deciding what I want on the car first though.

Is your CSB replaced? I'd do that first, if not.

[heinzboehmer]

When I swapped in my rebuilt 3.91 diff from diffs online last winter I can say almost all my clunk vanished. Shifts are much smoother now (however I'm in SMG), will be interesting to see how long that lasts. I had 100k on my original diff. I know this is Obi's thread but thought interesting enough to share.

Interesting. 125k on mine, so I think it could use a refresh. Now I want to drive a higher mileage car with a refreshed diff to see what that feels like.

Hmm.

I suppose I know what you mean-- you can feel the M clunk in the shifter. I do not, anymore.

I don't think I've ever noticed it correlating with extra notchy shifts, so I can't say I feel like that is reduced.

That's good to hear.

And maybe "extra notchy" is not the best way to describe it. What I'm talking about is the feeling that happens when you try to switch gears fast and don't let the drivetrain "settle". The shifter becomes harder to push into the gate and when it finally does go in, you can feel the drivetrain clunking through the shifter. Doesn't happen on every fast gear change, but it happens often enough to be annoying.

I think you both have convinced me to start planning a diff refresh. Need to spend some time deciding what I want on the car first though.

[Obioban]

Saw you say on another thread that the wavetrac diff is quieter than stock since there's no m clunk. Have you noticed any differences in shift feel with the new diff?

I ask cause I was driving around with the back seats down the other day and I could hear the diff clunking away pretty clearly. The clunks correlated with that extra notchy feeling that sometimes happens when switching gears (almost as if the whole drivetrain is loaded up and needs to unbind before the gear can be selected).

I'm starting to think that most of the gripes I have with how my transmission feels are due to my diff. Actually, I remember there was a noticeable improvement in shift feel when I swapped out the diff fluid right after buying my car.

Hmm.

I suppose I know what you mean-- you can feel the M clunk in the shifter. I do not, anymore.

I don't think I've ever noticed it correlating with extra notchy shifts, so I can't say I feel like that is reduced.

[oceansize]

Saw you say on another thread that the wavetrac diff is quieter than stock since there's no m clunk. Have you noticed any differences in shift feel with the new diff?

I ask cause I was driving around with the back seats down the other day and I could hear the diff clunking away pretty clearly. The clunks correlated with that extra notchy feeling that sometimes happens when switching gears (almost as if the whole drivetrain is loaded up and needs to unbind before the gear can be selected).

I'm starting to think that most of the gripes I have with how my transmission feels are due to my diff. Actually, I remember there was a noticeable improvement in shift feel when I swapped out the diff fluid right after buying my car.

When I swapped in my rebuilt 3.91 diff from diffs online last winter I can say almost all my clunk vanished. Shifts are much smoother now (however I'm in SMG), will be interesting to see how long that lasts. I had 100k on my original diff. I know this is Obi's thread but thought interesting enough to share.

[heinzboehmer]

Street review of wavetrac: indistinguishable from stock.

Saw you say on another thread that the wavetrac diff is quieter than stock since there's no m clunk. Have you noticed any differences in shift feel with the new diff?

I ask cause I was driving around with the back seats down the other day and I could hear the diff clunking away pretty clearly. The clunks correlated with that extra notchy feeling that sometimes happens when switching gears (almost as if the whole drivetrain is loaded up and needs to unbind before the gear can be selected).

I'm starting to think that most of the gripes I have with how my transmission feels are due to my diff. Actually, I remember there was a noticeable improvement in shift feel when I swapped out the diff fluid right after buying my car.

[Tonggi]

Larger screen Avin installed:

What avin model is this? I cant find it on their site

Edit, found it

https://avinusa.com/8-8-multimedia-n...x69088e46.html

man that is sexy looks a lot better than Avin Avant 4 that has a lot of buttons i dont really need

[Malloy]

Yes. My brother has the 0% in his car, and it is perfection.

Thanks again. I talked to Ronald the other day and I'm sold. He pushed me twd a 20% reduction so I need to decide. Either way, I can't wait to get his parts :-)

[D-O]

Would that be the Ultra kit or the Autocross kit?

Jesse

[Obioban]

Good deal. thanks. I need to get rid of my UUC (too notchy) and the 0% Auto Solutions sounds like a good option...

Yes. My brother has the 0% in his car, and it is perfection.

[Malloy]

I currently have a 20% auto solutions kit. Next time I have the trans out, I will swap it for a 0% auto solutions kit.

Stock knob (and will be staying that way).

Good deal. thanks. I need to get rid of my UUC (too notchy) and the 0% Auto Solutions sounds like a good option...

[Obioban]

Hey Ian, what shifter do you run?

I currently have a 20% auto solutions kit. Next time I have the trans out, I will swap it for a 0% auto solutions kit.

Stock knob (and will be staying that way).

[Malloy]

Hey Ian, what shifter do you run?

[Obioban]

Hey Obiodan, those ohlins are the regular R&T? Well the AW does 'look' like it's rolling over more than your car.

They're flat ride converted, stock valving. Stock R&T is 400/628. Those are
375 350
700 628

... though with a GC race front sway set to full stiff, which is doing way more for roll stiffness than the springs are :P
(sway bar is 69% of roll stiffness for that setup)

[enjoy_m3]

Hey Obiodan, those ohlins are the regular R&T? Well the AW does 'look' like it's rolling over more than your car.

[Obioban]

Why would the white car be lower in its stroke before that corner?

I'm not sure what you're asking here.

Tarmac doesn't look undulated. Are you saying the bumps were large enough to cause visible packing, but small enough they can't be seen on the tarmac in the photos?

Yes.

The size of the bump doesn’t matter— the question is if the spring is strong enough to overpower the cornering load + shock rebound + bump input. The world is full of tiny bumps.

I'm writing this because you've told all and sundry, for years, that this type of stuff was all in their head. But you get to post 2 pics (where you can barely even tell any difference [between 2 different cars, no less]), and come to conclusions?

Very anti-science of you.

I see where you're coming from, with the two photo thing. I just meant them as an example-- specifically because the white car is running the exact setup my car was on last year (as in, the parts I took off my car), as well as most of the other mods I have done, on the same corner, at a similar pace. It's about as good of a comparison as you could hope for.

That said, my real observation was when I opened the photo album-- it was immediately apparent to me that my car was notably less rolled over in every photo compared to every previous setup I've run. I posted the 2 picture comparison to the white car because it was an easy visualization of it, not as proof of anything.