IS F (2008-2014) Discussion topics related to the IS F model

2009 Ride Softening without changing coilovers

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Old 11-12-16, 11:13 PM
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BJM2014
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Default 2009 Ride Softening without changing coilovers

Hi all you suspension experts.... As everyone knows the ealry ISF's ride a little harsh. Is the stock suspension adjustable at all? Without changing yhe coilovers?
Old 11-13-16, 12:04 AM
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jspecvtec
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Nope not adjustable
Old 11-13-16, 10:01 PM
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socal3
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Try the bilstien struts that have been posted about a few times in the last month or two
Old 11-19-16, 06:20 AM
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tx1100f
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We are replacing our VW TDI Golf (buyback program) with an '08. I gotta tell you that the Golf is LOUD with a go-kart ride. My wife and I are super happy with the ride our new ISF delivers. It reminds me of our 1997 Miata after we put on all-season radials instead of "sport" tires: quiet, firm ride but still fun to drive around corners for miles and miles without ear and a$$ fatigue. It's all a matter of perspective...
Old 11-21-16, 05:50 AM
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Diesel350
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Originally Posted by tx1100f
We are replacing our VW TDI Golf (buyback program) with an '08. I gotta tell you that the Golf is LOUD with a go-kart ride. My wife and I are super happy with the ride our new ISF delivers. It reminds me of our 1997 Miata after we put on all-season radials instead of "sport" tires: quiet, firm ride but still fun to drive around corners for miles and miles without ear and a$$ fatigue. It's all a matter of perspective...
What kind of tires did you go with?
Old 11-21-16, 10:44 AM
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Quadrphnia
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Originally Posted by BJM2014
Hi all you suspension experts.... As everyone knows the ealry ISF's ride a little harsh.
What tires you running? Try dropping the pressure in them 10-20 pounds, it can make a huge difference.
Old 11-21-16, 12:38 PM
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USB_F
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Originally Posted by Quadrphnia
What tires you running? Try dropping the pressure in them 10-20 pounds, it can make a huge difference.
Not sure about dropping tire pressure 10-20lbs for daily driving. I personally wouldn't do it.
Old 11-21-16, 12:41 PM
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2011+ suspension is suppose to be a lot smoother and faster around a track. I changed shocks on my GT and 06IS to better forming ones and the cars are transformed now
Old 11-21-16, 08:47 PM
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BJM2014
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Thanks for the info!
Old 11-21-16, 08:50 PM
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liquidtek
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Originally Posted by Quadrphnia
What tires you running? Try dropping the pressure in them 10-20 pounds, it can make a huge difference.
Sounds like a perfectly good way to destroy some tires prematurely.
Old 11-22-16, 06:52 AM
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tx1100f
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Originally Posted by Diesel350
What kind of tires did you go with?
I haven't put new tires on and since it's my wife's DD she has it at work now I don't know what brand/model came with it. I was relating the current ride with the existing tires to our Miata with all-season family sedan radials. I'll post brand/model later.

I did notice that the air pressure on all 4 were 28-33psi. Sidewalls say 50psi. I filled them all to 50psi and my wife actually noticed the tighter feel of it (she didn't know I had filled them!). I still say the ride is much more enjoyable and quiet than the Golf TDI or Miata with sport tires ever was.
Old 11-22-16, 10:03 AM
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LOWFAST
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Originally Posted by tx1100f
I haven't put new tires on and since it's my wife's DD she has it at work now I don't know what brand/model came with it. I was relating the current ride with the existing tires to our Miata with all-season family sedan radials. I'll post brand/model later.

I did notice that the air pressure on all 4 were 28-33psi. Sidewalls say 50psi. I filled them all to 50psi and my wife actually noticed the tighter feel of it (she didn't know I had filled them!). I still say the ride is much more enjoyable and quiet than the Golf TDI or Miata with sport tires ever was.
50psi is usually listed as a not to exceed max. Anything short of a 1 ton truck 50psi is very excessive. I like to run mine in the high 30's, usually around 38 or so.
Old 11-22-16, 12:43 PM
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It's 36 psi per the bilingual sticker on your door jam.

OP, first thing I'd do is check your tire pressure with an accurate gauge to make sure they're not overfilled.

Last edited by tas02; 11-22-16 at 12:47 PM.
Old 11-22-16, 05:44 PM
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tx1100f
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Originally Posted by LOWFAST
50psi is usually listed as a not to exceed max. Anything short of a 1 ton truck 50psi is very excessive. I like to run mine in the high 30's, usually around 38 or so.
ALL my life I was told to fill the tires to the sidewall pressure. So after reading all the threads about what you guys run as tire pressure I can say you're all wrong or I can say 'damn, have I been wrong for 3 decades?' I believe it's the latter. After visiting many, many, many tire professional websites, I couldn't find anything to support my argument.

This sounds reasonable:
"To gain tire life, starting with 10% under the maximum, listed on the sidewall often gives improved tire wear, with a P-metric tire. For example, a tire listed at 44 PSI could start with about 40 PSI. From this point, we can adjust pressure down to the placard rating if ride quality is too harsh.

With a load rated (not P-metric) tire this method may give an extremely harsh ride. On these tires start with the tire placard recommendation and adjust upward until a good compromise is found. In both cases we should never exceed the minimum or maximum specified air pressure."

But in the end, I believe I'll use www.firestonecompleteautocare.com/tires/tire-pressure/inflation/ which recommends 36 front, 37 rear - basically the door placard.

My world has been rocked.

...and Bridgestone Potenza RE050A

Last edited by tx1100f; 11-22-16 at 05:52 PM.
Old 11-22-16, 06:45 PM
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BJM2014
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Originally Posted by tx1100f
ALL my life I was told to fill the tires to the sidewall pressure. So after reading all the threads about what you guys run as tire pressure I can say you're all wrong or I can say 'damn, have I been wrong for 3 decades?' I believe it's the latter. After visiting many, many, many tire professional websites, I couldn't find anything to support my argu
This sounds reasonable:
"To gain tire life, starting with 10% under the

i hamaximum, listed on the sidewall often gives improved tire wear, with a P-metric tire. For example, a tire listed at 44 PSI could start with about 40 PSI. From this point, we can adjust pressure down to the placard rating if ride quality is too harsh.


With a load rated (not P-metric) tire this method may give an extremely harsh ride. On these tires start with the tire placard recommendation and adjust upward until a good compromise is found. In both cases we should never exceed the minimum or maximum specified air pressure."

But in the end, I believe I'll use www.firestonecompleteautocare.com/tires/tire-pressure/inflation/ which recommends 36 front, 37 rear - basically the door placard.

My world has been rocked.

...and Bridgestone Potenza RE050A
l have always followed the door tire card regardless of tires...

Your link doesnt work?


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