Discussion in 'F80 M3 Saloon / F82 M4 Coupe / F83 M4 Convertible (2014-present)' started by M4UFO, Jan 16, 2020.
Anyone with 2019 M4 comp fitted ACS springs and what their views about them.
I think @Yas Man has ACS springs installed
Cool, did he put a tread up on them as I can’t find anything.
Had them on both my M4s and have them on my F80 M3
Best springs, best drop, great handling and comfort.
On other models F2xx they’re rebrand Eibach’s, is it the same for the F8xx? albeit with ACS they will support with warranty claims if needed where as Eibach will invalidate it.
Its what I thought too.
Thanks for that chap’s. These springs are not cheap so I take it they’re not going to give that bouncy feel that other springs do.
There's also a lot of debate on other sites (see bimmerpost) as to whether these springs were originally developed for the base M3/M4 models before the Comp Pack was even released, and could therefore be a down-grade to the comp springs.
As ACS don't publish the spring rates as they believe it's intellectual property - nobody can really be sure.
After my research, I decided to go with the official M Performance Spring kit as oppose to the ACS ones - given the cost between the two is somewhat negligible, and the BMW part is height adjustable.
The M performance spring kit is around £1.7k, I read on some site can’t remember which one a M3/M4 owner said the kit offered no performance value just a expensive way to lower the car.
It was a shade over 1k when I bought one in December (if you know where to look)
I have them also, one of Yas Mans old sets funnily enough and they are exactly as he says.
Had Swift Spec-R on the car when I got it and they were very harsh in comparison.
Think I'll give them a try just hope they don't give that po-go bouncy feel.
They are a great spring, work very well with the standard shocks...... BUT, like all aftermarket springs, at certain speeds you'll notice that the Shocks aren't good enough to cope with the rebound.
Spring kits will always be a compromise because they move the original damper out of its optimum operating range, which can overheat them on a spirited drive causing loss of damping and will ultimately kill them early. If you are talking of spending north of £1.5k then you need to spend a bit more and go for coilovers. I tried Litchfield springs and they gave slightly better handling but didn’t sort the poor rebound damping on the M4.
Went Nitron coil overs and never looked back. The car is a keeper now.