Wow, clearly its been a while since I updated this. The car didn't have anything really changed on it for a long time but then I bought Eibach springs because the non M-Sport suspension was just way too high. It was supposed to drop the car around 25mm all round but seemed to go a fair bit lower than that.
When I swapped them out I realised my struts/shocks were toast (absolutely zero rebound when hand compressed) and so I bought a set of super cheap KYB and an unknown brand to replace them to buy me some time.
With this bog stock setup and with the cheapie suspension and a set of Hankook RS4's, I managed a best time of 1:18.9 at Wakefield. This was a bit irritating though because it was the last session and the car started misfiring really badly on the straight of the final (and best) lap. I reckon without the misfiring I could have had another second and at least another lap or two.
Misfiring was just a partially unplugged coilpack. It was pretty warm in the bay, maybe it shifted a little when it heated up.
Not once did the car oversteer. I never lost rear end grip. Now, clearly the old girl isn't a sprightly lass, but I thought I'd get something. I also had a fair bit of roll.
One thing that blew me away was the brakes. Single piston front and rear, 330mm front and 336mm rear discs. Just kept going. I was absolutely mashing the peddle, the car would do a little wiggle and she'd pull up. Every time! Never faded on me, no matter how hard I tried.
My brother in law in his 130i 6 speed was 2 seconds quicker (i think) but he's a small bloke and that car is a bit lighter than mine. Same tyres though.
So, we did some research and made some changes;
Whiteline front (27mm) and rear (16mm) sway bars
Whiteline rear subframe bush inserts
Heavy duty front sway bar links
M3 front control & radius arms
HEL braided lines and full brakes flush.
Also, managed to get some 2nd hand Bilstein B8's.
After putting this all in and having a full alignment done (to -1.5 deg front camber) and the car is a different beast. The turn in is insane and the roll, general stiffness and shock performance is absolutely perfect. At least on the street.
I do admit that I've lost a bit of comfort. The rear inserts have made every single little road noise echo in the car and she's very stiff. But I've always liked hard suspension. She's also VERY low. Much lower than the disclosed amount on the springs. I have bought some E30 spring perches which are identical to E90 but 10mm higher which will raise the car and give me 10mm of shock travel back.
Anyway, here's the old girl. I love this car!