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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 08-11-2013, 09:37 PM   #41
E46 WOT
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Originally Posted by jabela View Post
No worries. If you could take the measurement that would be nice. Just measure from the center of your wheel center cap up to the fender. This measurement is nice because tire sizes don't factor into it.

So I did discover the source of the clunking on sudden impacts. Turns out my rear shock mounts were loose. This probably happened because I tightened them while the wheels were in the air. After a couple days, the gaskets between the mount and the body compressed and the nuts loosened. I might have to put some locktight on them if they loosen again as the platings on the bolt and nut make it pretty slippery.

Had my first autocross on them this Saturday. I had to raise the front ride height way up to 14" just to clear my 255/40/17 tires and 9" wide rims. I was using a 5mm spacer before, but now I will have to use a 12mm spacer to clear everything. The tire was rubbing on the lower spring perch, and the rim was precariously close to the lower strut lock ring.

Anyhow it went pretty well. The course was pretty bumpy so I was playing with the shocks between 0-50% stiff. Fastest run was at 0%, but it was also my best drive. Matched an 08 Porsche 911 in raw time and was only beat by a prepped 05 Miata in raw time. The Mazda beat me in PAX time by .4 seconds.

Here's my fastest/last run.

Dude, I've never seen autocross vid like that, you're precise and fast! I had to use spaces on my front wheels as well. Sorry I hadn't checked the thread in a while, I just had my first stint in a 24hr Chump Car race!

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2004.5 M3 SMG
CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.
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Old 08-12-2013, 02:44 AM   #42
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Dude, I've never seen autocross vid like that, you're precise and fast! I had to use spaces on my front wheels as well. Sorry I hadn't checked the thread in a while, I just had my first stint in a 24hr Chump Car race!
Thanks! With the lack of power in a 325, the only way to be fast is to be smooth and precise.

I definitely want to do chumpcar someday. Looks like tons of fun and the best racing for the money.
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Old 08-12-2013, 09:33 PM   #43
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Thanks! With the lack of power in a 325, the only way to be fast is to be smooth and precise.

I definitely want to do chumpcar someday. Looks like tons of fun and the best racing for the money.
Smooth and precise is the secret to all racing, whether you have lack of or plenty of power, the best way to learn is with lack of though Chump was great, I was sad not to get to do the night stint but our car kicked the bucket.

BMW CCA Club Racing weekends are really good time for the money (unlike NASA), while Chump is a lot of time, it isn't all usable time and I feel ultimately breaks down to better dollars spent touring BMW club racing. imho.

(I realize your in Canada, so my recommendations might not be apples to apples)
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2004.5 M3 SMG
CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.

Last edited by E46 WOT; 08-12-2013 at 09:35 PM.
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Old 08-21-2013, 06:33 PM   #44
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i dont see a listing for isc coilovers on ISC NA website for E46 M3. do they no longer make coil overs for E46 M3?
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Old 08-22-2013, 11:11 AM   #45
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i dont see a listing for isc coilovers on ISC NA website for E46 M3. do they no longer make coil overs for E46 M3?
http://store.bimmerworld.com/isc-n1-...age-p1835.aspx

Call Bimmerworld, they have them in stock 877-639-9648
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CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.
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Old 08-22-2013, 11:14 AM   #46
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So another unexpected benefit of the coilovers is the much improved clutch feel. Previously the clutch felt vague and inconsistent. With the coilovers, body roll and squat are now negligible, leaving the clutch feeling much more precise. This improvement is even more than when I swapped old engine and transmission mounts for new M3 mounts.
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Old 08-22-2013, 11:16 AM   #47
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i dont see a listing for isc coilovers on ISC NA website for E46 M3. do they no longer make coil overs for E46 M3?
I believe they are the same part.
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Old 08-27-2013, 04:32 PM   #48
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So another unexpected benefit of the coilovers is the much improved clutch feel. Previously the clutch felt vague and inconsistent. With the coilovers, body roll and squat are now negligible, leaving the clutch feeling much more precise. This improvement is even more than when I swapped old engine and transmission mounts for new M3 mounts.
I noticed shifts firming up when I swapped out oem sway bar mounts, fcabs, rtabs, and shock mounts, of course I'm with SMG but you still can notice differences in the weight transfer- great contribution and observation!
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CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.
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Old 08-29-2013, 03:26 PM   #49
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Here's an underbody video showing the suspension at work. I need to figure out where I can put it on the front. Maybe in the brake cooling duct?

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Old 08-30-2013, 05:25 PM   #50
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Here's an underbody video showing the suspension at work. I need to figure out where I can put it on the front. Maybe in the brake cooling duct?

That's really cool! Do you have any other suspension components up-graded?

And, have you noticed better times using the ISC-N1 set up so far?
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Old 08-31-2013, 12:43 AM   #51
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That's really cool! Do you have any other suspension components up-graded?

And, have you noticed better times using the ISC-N1 set up so far?
I haven't been able to do a direct comparison, but the car definitely has less understeer and better traction on exit, so it should be faster.

The other suspension mods I've done are Powerflex FCABs and an M3 front sway bar. However, I may remove it to see how it feels now that I have useable front camber.
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Old 08-31-2013, 03:01 PM   #52
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E46 M3, ISC N1 coilover install and review thread, bought from Bimmerworld

Hmm looks great I might be picking up a set shortly. Wonder how they compare to bc coils


Sent from BimmerApp mobile app
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Old 09-04-2013, 10:14 AM   #53
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I haven't been able to do a direct comparison, but the car definitely has less understeer and better traction on exit, so it should be faster.

The other suspension mods I've done are Powerflex FCABs and an M3 front sway bar. However, I may remove it to see how it feels now that I have useable front camber.
What % stiff or soft did you set your front and rear shocks?
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2004.5 M3 SMG
CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.
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Old 09-04-2013, 10:18 AM   #54
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Hmm looks great I might be picking up a set shortly. Wonder how they compare to bc coils


Sent from BimmerApp mobile app
On the surface it looks like ISC has a better warranty. I don't know anything else about the B C kits.
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CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.
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Old 09-04-2013, 02:32 PM   #55
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What % stiff or soft did you set your front and rear shocks?
On the tighter track on 7/23 I had about 40% front and 10% rear. However, I may reverse that in the future as that was my first time out on them.

On the slightly less tight track on 8/25, I had 2 clicks front / 0 rear. I didn't really play around too much though due to limited number of runs.

I still have my M3 sway bar on, and I'll probably remove that and put my stock sport sway bar on.
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Old 10-22-2013, 11:18 PM   #56
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So I've found that on my 18" rims, increasing the tire pressure on the fronts to 38psi significantly improved the harshness over hard joints/bumps.
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Old 10-23-2013, 02:21 PM   #57
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So I've found that on my 18" rims, increasing the tire pressure on the fronts to 38psi significantly improved the harshness over hard joints/bumps.
interesting!
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CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.
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Old 10-23-2013, 02:26 PM   #58
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interesting!
Yup. I think the tire was bottoming out on the rim before the suspension could react. By increasing the pressure (spring rate) of the tire, it allows both systems to do some work.
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Old 10-23-2013, 02:30 PM   #59
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Corner balanced at Bimmerworld!

Monday I went down to Bimmerworld to help with a project they were working on and I got corner balanced while I was down there. My base weight was 3,333lbs with about a half tank of gas (I've removed all the trunk trim and tire kit etc) plus I remove the back seats when I'm at the track so they were out too.

They did a compromise between me being solo in the car and having an instructor/passenger in the car. The solo ratio from FL to RR is 50.4% and with the instructor/passenger 49.99%. They also set my camber/toe to:

-2.6/.008out -2.5/.008out



-1.75/.013in -1.75/.010in

Now I'm hoping for good weather for the upcoming Tarheel Chapter BMW CCA HPDE Nov 23-24th at VIR.

I've also registered for the BMW CCA Club Race School at Roebling Road on Dec 11-12th!
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Old 10-23-2013, 02:32 PM   #60
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Yup. I think the tire was bottoming out on the rim before the suspension could react. By increasing the pressure (spring rate) of the tire, it allows both systems to do some work.
Yeah that's what I was thinking about, I'll play around with street pressures and see what I notice. I played around with the settings one afternoon on my Klovering and couldn't find anything I liked better than 0% stiff up front/20% stiff on the rears.
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CF CSL Trunk, CSL replica bumper, 18x9.5 BW Arc-8 w/ 245/265 R-S3s, PFC 08 pads, SS brake lines, Prospeed 683 Brake fluid, ISC N1 Coilovers, Powerflex poly RTABs, sways, and diff bushings, solid FCABs, BW performance motormounts, Rogue transmounts, BSW I-Pod Dock, Rookie BMWCCA Club Race license, 2:08.935 VIR Full Course, BW intake boot + K&N drop in filter. Borla catback exhaust.
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