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Discussion Starter · #1 ·
I custom-ordered my V70R in 2004, and have now owned it for a few weeks shy of 2 years, and have covered about 26,000 trouble-free miles.

I've been reading this forum since before I ordered the car, and have read all of the comments about 4C, and it negative influence on the R's handling. I've always been relatively happy with the car, my ownership experience has been a good one. I haven't felt the need to mechanically modify the car, which is the most powerful and capable car I've ever owned. Somehow, the R isn't as emotionally involving as any of my previous cars (a series of Saab 900s and our current 9-5), but that's just my personal perspective or bias.

The only minor disappointments with the car have been the big turning radius (which I totally knew about and accepted before ever ordering mine), and the occasional skittish-ness of the suspension. Those two combine to make the car drive "big", i.e. it seems to drive like a car that's bigger than the V70R is. I had read about other people being happy with the handling after disabling 4C, but never bothered to try it out.

Today I was cleaning out the luggage compartment, and removed the fuse access panel. From there I saw the 4C accelerometer mounted, and decided to unplug it and go for a drive. Verdict: a more settled ride. Not quite as buttoned down, but definitely more settled. I'd have been perfectly happy if the suspension felt this way from day 1.

When I got home I hooked the sensor back up, closed the fuse panel, and finished my vacuuming of the luggage area. It's great to know how it feels. And to know I can do that any time I want. But like most of you, I'll keep the system plugged in. It was a great little experiment, thanks for all the people who have posted over the past ~3 years about how to do try that out.

The next "mod" will come in a month when my daughter turns 1, when I can turn her car seat around to forward-facing and get some front-seat legroom back. I can't wait.
 

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Re: After 2 years, I finally tried the car with 4C disabled... (kr900)

If you install a set of TME springs (and rear bar) you'll be SHOCKED how well they match to a disconnected 4C
JRL
 

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Re: After 2 years, I finally tried the car with 4C disabled... (JRL)

What fuse is it again to disable 4C?
 

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Re: After 2 years, I finally tried the car with 4C disabled... ("R" Kelly)

I don't know on an 05-06.
It's 23 in the side dashboard on an 04 but 05-06's have a different electrical system.
Open all your fuse covers and LOOK
(It will say somewhere)
 

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Re: After 2 years, I finally tried the car with 4C disabled... (JRL)

Quote, originally posted by JRL »
If you install a set of TME springs (and rear bar) you'll be SHOCKED how well they match to a disconnected 4C
JRL

YES!!! I gotta second that.

Becuase of kr900's post, I figured what the heck, I'll run try it out myself right now.

Went on my usual test drive route, and the difference is simply amazing. The car does what I want it to now (not what it wants to). You can shift the weight around properly, put the load on the tires you want the load on, etc.

Keep in mind I've got the eibachs and ipd's track-spec sway bars.

Initial turn in isn't quite as crisp as it is in Advanced.

I think it's probably a toss up as to whether or not the vehicle is as fast with 4C disconnected as it is in Advanced on a smooth road. I think it might end up being the same because, despite the softer damping rates with the 4C disconnected, you can drive the car the way you're supposed to, which probably compensates for the lessened damping.

Now, compare track times in Advanced on a bumpy track versus 4C disconnected, and I guarantee it'll be faster with 4C disconnected. I'm VERY impressed with how well the vehicle stays the course over bumps (instead of going every possible direction other than where you want it). And, as JRL's harped about for years, the rear end hop is completely eliminated.

I doubt disconnecting 4C would be as impressive on a vehicle with stock springs/sways.
 

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Re: After 2 years, I finally tried the car with 4C disabled... (R Salesman)

Quote, originally posted by R Salesman »

I doubt disconnecting 4C would be as impressive on a vehicle with stock springs/sways.

Perhaps not AS impressive, but impressive to me nonetheless after 2 years with 4C always on...
 

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Re: After 2 years, I finally tried the car with 4C disabled... (R Salesman)

Told you so, as I've been saying for years but you had to wait for SOMEONE ELSE to also tell you, I'm disappointed


I would think advanced ON A PERFECTLY SMOOTH ROAD will be a bit quicker but ONE BUMP and all bets are off
 

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Re: After 2 years, I finally tried the car with 4C disabled... (kr900)

I got seasick and almost hurled after running the ring last year with 4C off and stock springs.

Wheels stayed planted, but the rest of the car was like an old Buick, swaying all over the place...
 

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Re: After 2 years, I finally tried the car with 4C disabled... ("R" Kelly)

Quote, originally posted by "R" Kelly »
I got seasick and almost hurled after running the ring last year with 4C off and stock springs.

Wheels stayed planted, but the rest of the car was like an old Buick, swaying all over the place...
You cannot be aggresive without adding springs. Nice for just cruising.
What brain fade did you have to even remotely think this would do any good on a track (without springs)?
I had said many a time in the past that the springs are VERY SOFT and the 4C compensates with shock adjustment.
Totally an INCORRECT way to design a suspension like the 4C
 

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Re: After 2 years, I finally tried the car with 4C disabled... (JRL)

Quote, originally posted by JRL »
What brain fade did you have to even remotely think this would do any good on a track (without springs)?

Wasn't a brain fade, it was a bad accelerometer and a bad shock sensor that led to this showing up on my first lap...



Driving on the ring with 4C throwing fits is less fun than driving with loads of body roll...

http://forums.swedespeed.com/z...05254

Worst part is, today, I went into get my new bushings loosened and re-tightened because rear end was very squirrely above 100mph ... when we hooked it up to VIDA to turn off auto light switching, we did a SUM calibration and VIDA discovered I have a bad right rear 4C sensor... no time to get it fixed before Sunday though (farewell Ring trip), so I'll be trying the ring again with 4C disabled, but on TME springs and with a 22mm roll bar. Should be interesting, will let you all know.
 

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Re: After 2 years, I finally tried the car with 4C disabled... ("R" Kelly)

Quote, originally posted by "R" Kelly »


I'll be trying the ring again with 4C disabled, but on TME springs and with a 22mm roll bar. Should be interesting, will let you all know.
Should be a WHOLE LOT BETTER.
Not as stiff as advanced but you should be able to hustle it around much faster than you did the last time
 

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Re: After 2 years, I finally tried the car with 4C disabled... (JRL)

Quote, originally posted by JRL »
Told you so, as I've been saying for years but you had to wait for SOMEONE ELSE to also tell you, I'm disappointed

Don't be disappointed. I had just been lazy. The real catalyst for change was that I just recently moved, and the new ride into work is on a MUCH bumpier stretch of road . . . so bumpy that the 4C had been giving so much trouble that I've actually been thinking about selling my R because I can't stand feeling like a baby sitter (always trying to keep the car in line). And the kr900 posted, and I was like "Oh yeah, I should try that!"
 

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Re: After 2 years, I finally tried the car with 4C disabled... ("R" Kelly)

Quote, originally posted by "R" Kelly »

I'll be trying the ring again with 4C disabled, but on TME springs and with a 22mm roll bar. Should be interesting, will let you all know.
You may want to up your tire pressures (for the track a bit).
Adding pressure is like adding spring rate so you can experiment a bit at the Ring
 

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Re: After 2 years, I finally tried the car with 4C disabled... (JRL)

So for an '05, what fuse to pull, and which fuse box?
 

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Re: After 2 years, I finally tried the car with 4C disabled... (Short Circuit)

Quote, originally posted by Short Circuit »
So for an '05, what fuse to pull, and which fuse box?

Don't bother with the fuse. Pull the lead off the accelerometer in the trunk. You will retain your automatic lights that way. Otherwise, they point straight down.
 

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Re: After 2 years, I finally tried the car with 4C disabled... (JRL)

While I don't argue with your changes and results, you do bring up an interesting point in regard to design.

To me this was an envious assignment for the engineering team. To have a blank sheet of paper, within the constraints of the P2 platform, and have the focus of only a performance oriented car, not having to please the soccer moms etc. it makes it more of a disappointment. Volvo even conceded to "sticky" tires, at least for Volvo. I would like to think that the best and brightest of Volvo, Monroe, Ohlins, Motorola, et al could have done better and blown away the competition with an honest, high performance, active suspension system, that would more than make up for any under run in horsepower, especially combined with the R brakes.

I applaud those that have made it be what it should be, and kept it an active system as well. Surely we are past the days of Eibachs and Koni's, as much as lever action shocks.

My dealer experience is so modification adverse that I am not changing anything to give them the most remote of excuses, lest I would probably be complaining less, and more action oriented, as many here have done. I do also use my V70R for touring and load and ground clearance is a consideration.
 

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Re: After 2 years, I finally tried the car with 4C disabled... (icebiker)

The buttons are non operative, you stay with what you got. This is a part of the 4C remember?
You can't have everything
 

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Re: After 2 years, I finally tried the car with 4C disabled... (JRL)

Quote, originally posted by JRL »
I don't know on an 05-06.
It's 23 in the side dashboard on an 04 but 05-06's have a different electrical system.
Open all your fuse covers and LOOK
(It will say somewhere)

Well, see, although I did this last year, I couldn't remember which one it was, and when I looked in the side fuse cover, I didn't see one that said 4C or active chassis...



I went ahead an pulled 23 like you suggested, but that only disabled my trip computer and steering stalk, 4C buttons still worked.

Might it be 27 - CCD?
 

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Re: After 2 years, I finally tried the car with 4C disabled... ("R" Kelly)

Just dawned on me, if I did this last year, there is no way I would'nt post what fuse it was....

Quote, originally posted by "R" Kelly »
I did another lap in the afternoon, this time with fuse 27 pulled, No 4C.

Sometimes I forget how anal and infomative I am...
 
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