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Obioban's 2005 IR/IR Coupe
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Why would the white car be lower in its stroke before that corner? 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?
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.
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I can confirm when I get home, but I believe my compression and rebound damping are roughly 1:1.
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Originally posted by Tbonem3 View PostMaybe you have more compression dampening.
Either way, I agree that this isn't slam-dunk proof of less "jacking down", though it's certainly consistent with that hypothesis.
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Originally posted by K-Dawg View PostThe car looks great!
I don't think you've commented much on how the FCM dampers behave around town, as far as comfort and civility go.
Agreed that flat ride is huge. Now, when people say that their non-flat ride suspension rides/handles nicely, I tend to stop listening.
As for the AC, you might try just getting a proper vacuum and refill on the system and doing what you can to clean the condenser. Although at that point, changing the condenser is probably not much more work.
That said, short term I'm going to do nothing. While we're building our house, I don't have any good place to do car work-- so projects are limited to either being superficial (trackconnect module) or necessary... or... pay someone to do it π². Trying to avoid the last.
On nicely paved to fine backroads, the FCMs are magic. As in, I didn't know it was possible for a car to be this good.
On large potholes, they are not as good as the flat ride converted Ohlins were.
In terms of ride quality, they're firm but not harsh. Ride quality is pretty similar to my Dinan springs (which are flat ride)/Koni M3 (wagon). Small/medium bump ride quality is better than the Ohlins were, large bump/potholes are worse than the Ohlins were. At highway speeds (+), they're always pretty great.
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The car looks great!
I don't think you've commented much on how the FCM dampers behave around town, as far as comfort and civility go.
Agreed that flat ride is huge. Now, when people say that their non-flat ride suspension rides/handles nicely, I tend to stop listening.
As for the AC, you might try just getting a proper vacuum and refill on the system and doing what you can to clean the condenser. Although at that point, changing the condenser is probably not much more work.
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Originally posted by Tbonem3 View PostYou're making a conclusion with confirmation bias due to having bought these really expensive dampers (which you tell others not to do), based off a photo.
You'd have to get a picture BEFORE the corner to see if his wheel is closer than yours aka being "packed up". Even then, it could be other factors. No, I don't believe your two cars' front driver corners, and in general, are the exact same.
Jacking down is a made up phrase from Shaikh. Foesn't exist. The phrase is pack up.
Him being deeper into the corner is less spring or heavier corner weight or he's faster. Maybe you have more compression dampening.
Packing up can lead to less control, harsher/harder ride. It's less comfortable as you're further into your travel as the bumps come. But it doesn't mean you dig deeper into a corner. Only speed (before loosing traction) can cause your wheel to compress more in a corner, given fixed spring rate and corner/car weight.
You're not even doing slaloms or something, it's just one corner as far as I can tell.
*Thought of another possiblity - you're talking a smoother line resulting in less compression.
Here's Koni defining it: https://www.koni-na.com/en-US/NorthA...-Tuning-Guide/
Here's Eibach defining it: https://eibach.com/us/ft-3-eibach-su...-glossary.html
I plucked those two pictures because it was a nice side by side. But, the reason I noted this was was that, when I downloaded the pictures, my car is notably less rolled over in every picture than the photos from all previous events (on all previous setups) I've done for the last 15 years (despite my setup being softer than everything I've run other than the post flat ride converted Ohlins). It was the first thing that stuck out to me about the entire photo set-- the car was notably less rolled over than any previous event, in every cornering picture. I agree that two pictures in isolation would be meaningless-- I just meant them as an example of an overall trend.
Originally posted by Tbonem3 View PostOnly speed (before loosing traction) can cause your wheel to compress more in a corner, given fixed spring rate and corner/car weight.
Or, as Koni put it in the link above,
Too much rebound control in relation to spring rate will cause a condition known as "jacking down." This is a condition where, after hitting a bump and compressing the spring, the damper does not allow the spring to return to a neutral position before the next bump is encountered. This repeats with each subsequent bump until the car is actually lowered onto the bump stops. Contact with the bump stops causes a drastic increase in roll stiffness. If this condition occurs on the front, the car will understeer; if it occurs on the rear, the car will oversteer.
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You're making a conclusion with confirmation bias due to having bought these really expensive dampers (which you tell others not to do), based off a photo.
You'd have to get a picture BEFORE the corner to see if his wheel is closer than yours aka being "packed up". Even then, it could be other factors. No, I don't believe your two cars' front driver corners, and in general, are the exact same.
Jacking down is a made up phrase from Shaikh. Foesn't exist. The phrase is pack up.
Him being deeper into the corner is less spring or heavier corner weight or he's faster. Maybe you have more compression dampening.
Packing up can lead to less control, harsher/harder ride. It's less comfortable as you're further into your travel as the bumps come. But it doesn't mean you dig deeper into a corner. Only speed (before loosing traction) can cause your wheel to compress more in a corner, given fixed spring rate and corner/car weight.
You're not even doing slaloms or something, it's just one corner as far as I can tell.
*Thought of another possiblity - you're talking a smoother line resulting in less compression.Last edited by Tbonem3; 08-22-2021, 09:35 PM.
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Shaikh talks a lot about preventing jacking down. Looking through these pictures, I found an interesting comparison, that makes it look like what he's doing in that regard.
The white M3 is on my former Ohlins' setup (I sold it to him). Same spring rates as me, same sway as me, same weight as me. Same corner, same grip level tires. My current setup has more bump and droop travel, so more space available for body roll. I believe the difference we're seeing is his setup has experienced jacking down, while mine has not.
Itβs actually more exaggerated than the pics make it look, too, as the AW car is on 17 and Iβm on 18sβ so at static ride height, my wheels are closer to the fenders
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Been a couple years since I purchased any pics from the track side photographer, so I did. In retrospect, I kind of regret choosing this event for that, as it was the worst event I've been to... ever, but pics seem fine.
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