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General E46 Forum
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Old 11-20-2013, 08:26 PM   #1
k_h_d
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Replace springs when installing Koni sport shocks?

I bought a 2004 330i w/ ZHP. It has 63,000 miles and I am going to install Koni yellow sport shocks sometime this winter. I may autocross the car a little and prefer to run in stock (or now street) class. That means I have to stay with stock springs.

Would my current ZHP springs be fine or should I replace those when I put on new shocks?

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Old 11-20-2013, 08:28 PM   #2
bimmernate
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your current springs are most likely fine, just inspect that there are no cracked/breaks and you are good to go.
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Old 11-20-2013, 08:30 PM   #3
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Reusing your current springs is fine. Unless they are rusted, collapsed, or broken towards the bottom (it happens on some E46s) then they are just fine. However if you're upgrading your dampers to those nice Koni single adjustable units, you might want to consider a set of Eibach or H&R springs. Dinan actually makes a package deal with Koni dampers and Dinan springs.
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Old 11-20-2013, 08:30 PM   #4
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Does the car sit level? If you bounce the back/front do both sides bounce pretty even? If yes then your springs are probably ok.
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Old 11-20-2013, 08:34 PM   #5
k_h_d
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However if you're upgrading your dampers to those nice Koni single adjustable units, you might want to consider a set of Eibach or H&R springs.

I would but then the car is no longer in the street class for auto crossing. Last year i was very competetive regionally with my MINI and I am debating if I am going to run the MINI next year or move to the BMW. They are both in the same class actually.


Any comments on Koni FSD vs the sport shocks?
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Old 11-20-2013, 08:35 PM   #6
k_h_d
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Does the car sit level? If you bounce the back/front do both sides bounce pretty even? If yes then your springs are probably ok.

The car sits level and rides fine I am just looking for a little stiffer shock. I was not sure if a 9 year old spring would have lost any effectiveness. There is very little if any rust at all.
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Old 11-20-2013, 08:54 PM   #7
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I would but then the car is no longer in the street class for auto crossing. Last year i was very competetive regionally with my MINI and I am debating if I am going to run the MINI next year or move to the BMW. They are both in the same class actually.


Any comments on Koni FSD vs the sport shocks?
I understand completely. The modifications I did to my 330i also bumped me into the 6 Cylinder modified class when I used to be in 6 cylinder stock class - whole different ballgame.

From what I've heard and read, FSDs are very good dampers, but they're expensive and some people claim they make the ride almost too 'supple.' If I were in your shoes, I would either stick with the Koni single ajustable yellow sport dampers or look into Bilstein sport dampers.
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Old 11-20-2013, 09:45 PM   #8
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No reason to replace springs unless they're broken. The rear springs are the biggest culprits. Look very far down into the cup, if you find that the lower spring is broken then you'll need a new one. It might be difficult to see, so compare sides. Look especially for rust on the end. This is a pretty tell-tale sign that it broke at some point.
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