Track forum general chit chat.

[roastbeef]

I think it's going to be one of the first couple of things ordered. I'm already going to have to relearn this car. It also seems like a commonly overlooked part that people wish they had done sooner.

[omgzirra_exe]

Originally Posted by ///Mobbin

Curious if anyone heard anything more on the potential Schrick 292 group buy: https://www.m3post.com/forums/showthread.php?t=1774651 (see page-3), seems Epoustouflant got banned before it got off the ground.

Hoping to install these myself after SYT_Shadow get's a DIY together for us

i was on that GB also and i also forgot about it lol. i might as well just buy direct since no point in waiting at this time.

[dogbone]

Originally Posted by Richbot

Step 1 to setup - diff that works

Steps we actually take:

Step 1) Add square wheels/tires and camber and a splitter and get a real nice pointy front-end
Step 2) Add wing to plant the rearend
Step 3) Spin/swear at the car a lot
Step 4) Sell the car
Step 4a) Get a decent diff

damn it......I appear to be on step 32......anyone know how may steps there are? Please send help.

1 - add supercharger to bone stock car
2 - add camber plates
3 - add track rims
4 - add front brakes
5 - add rear brakes
6 - add suspension
7 - add towing truck
7a - add trailer
8 - add titanium x-pipe
9 - add more rims
10 - strip car, add cage
11 - curse at car because it is undriveable after the cage install....tail is everywhere
12 - add rear wing.....massive understeer
13 - add front aero....yay balance is back
14 - add diff
15 - add lightweight battery
16 - add slicks
17 - uh oh repeat steps 4 and 5 and replace brakes with better brakes
18 - uh oh repeat steps 3 and 8 - replace track rims with better rims
19 - add carbon doors
20 - add carbon headlight blanks
21 - uh oh repeat step 6 and replace suspension with a better suspension
22 - swap rear springs because I don't like feel
23 - uh oh repeat step 12 and replace front aero with better aero.
24 - Penalty step - replace motor due to head gasket issues
24a - Penalty step #2 - Chase down annoying steering issue that ruins COTA event.
25 - swap rear springs because I don't like feel
26 - uh oh repeat step 11 and replace wing with better wing. Give old wing away like a junkie to a shop as trade for labor hours. Damn it. Morals out the window.
27 - swap rear springs because I don't like feel
28 - uh oh repeat step 7 and replace truck with a better towing truck
29 - everything is out of control. Please help.
30 - swap rear springs because I don't like feel. Ok this is getting old.
31 - penalty step - raid junkyard car for parts to fix brake assembly.
32 - swap rear springs because I don't like feel. Ok this is really getting old.

[leftfootbr8king]

Step 145 - finally your race car has drained all your financial resources to the point you'll never recover.

But enjoy the all the steps between your current state and someday

[Redd]

Originally Posted by ///Mobbin

Curious if anyone heard anything more on the potential Schrick 292 group buy: https://www.m3post.com/forums/showthread.php?t=1774651 (see page-3), seems Epoustouflant got banned before it got off the ground.

Hoping to install these myself after SYT_Shadow get's a DIY together for us

I'm in the Eur-c-nn-x (Epos' GB biz) mailing list and no, there's been no developments on the Schrick cams.

[DRLane]

Originally Posted by Redd

I'm in the Eur-c-nn-x (Epos' GB biz) mailing list and no, there's been no developments on the Schrick cams.

Has anyone had any success with his later group buys?

[leftfootbr8king]

I reserved some 4.1 FD gears a while ago this spring (feb/March) and haven't seen anything.

[leftfootbr8king]

I did have success with the two piece frp gts lip buy. It looks great, but the brackets and splitter mounting rail were a bit shoddy in regard to mounting holes and threading

[Redd]

Originally Posted by bbnks2

I won't derail the thread more. I am sure I won't feel a damn difference between the GKN unit and the wavetrac on track unless I am really cracking tires loose constantly. Overall, I would've been happier spending the money on better coilovers. I think the m3 diff gets you so close to an aftermarket diff already the money might be better spent elsewhere until you get to that final piece to complete a build.

Based on what I understand, the Wavetrac is a helical (torsen) diff, which operates as an open diff until a torque differential is detected and then it locks. The GKN Viscolok - even though it uses clutch plates - also acts like an open diff until it senses a speed differential between the wheels, and then it locks. My complaint about the GKN is that when this speed differential occurs, it means you're already in a spin. The slow reaction time of the GKN means you're gaining rotational angle while the diff wakes up and thinks about what it wants to do. Then, once it decides and locks the clutches, it snaps the rear end back in line so aggressively that it upsets the car. There's nothing smooth or subtle about the GKN when it works.

The clutch-type diff like OSG/Drexler is different. When the car is accelerating, the cam in the diff actively pushes against the ramps and locks clutches and delivers power to the wheels equally. So, even without slip, the wheels are locked. Under acceleration, the clutch diff is not an open diff. When the rear end does start to spin, the clutch diff allows both wheels to slide together (because they are still locked) which results in much more predictable rear end behavior. Then there's the part lock under braking (1.5 way) which helped me reduce the rear end wiggle while hard braking.

This for me is the biggest difference between the OSG and the GKN - the OSG results in the rear end being so much more predictable, planted and confidence inspiring. The best part is that it's so smooth and silent, you don't even know it's there. It just feels like the car is how it should have come from the factory and finally I understood what all the praise for the E9x chassis was about. If you drive the same way, especially if you're not spinning the rear wheels at every turn, a clutch diff may not result in an immediate drop in laptimes like better tires would. But it should give you more confidence to push harder and raise the limits. If I were to do it all over again, the OSG would be in the Top 3 list of things to do, before even coilovers.

[SYT_Shadow]

Regarding 292 cams, the issue isn't the cams themselves. The complicated part is getting a proper tune for it. Given that 'tuning' in the m3 world means copy and pasting random code stolen from 8 other tunes and mixing it around, this is taking a while.

I'm working on solving that problem. It will be solved.

If anyone feels like they have to have 292 cams, feel free to reach out

[dogbone]

Originally Posted by dparm

Are you looking at wheel speeds to determine this? I assume some sort of math channel could be built to determine how much locking is taking place.

On the E9x M3, an AIM Solo DL that's tied into the CAN bus is able to log the mph spinning speeds of all four wheels independently. So, yes, I'm just overlaying the rear left and rear right wheels on top of each other on a chart to compare the spin rates. There's no fancy calculations.

Here are a few examples of what I posted in the diff write up on my build thread. I posted AIM charts of two laps of almost identical lap times. I'm not going to delve into them here since I did that on the build thread. But it doesn't take much analysis to see how much the stock diff spins up the inside wheel before it locks versus the OSG Superlock locking quite quickly-----just look for the spikes in speed that appear on the stock diff chart lines.

[fsmtnbiker]

Originally Posted by dogbone

29 - everything is out of control. Please help.

This is the step I am (eternally) stuck on.

[roastbeef]

Originally Posted by SYT_Shadow

Regarding 292 cams, the issue isn't the cams themselves. The complicated part is getting a proper tune for it. Given that 'tuning' in the m3 world means copy and pasting random code stolen from 8 other tunes and mixing it around, this is taking a while.

I'm working on solving that problem. It will be solved.

If anyone feels like they have to have 292 cams, feel free to reach out

I was entertaining the thought of the more mild cam. I heard it doesn't require a tune.

I can't tear the engine down every two years for the smog check here in California.

[DRLane]

Originally Posted by roastbeef

I was entertaining the thought of the more mild cam. I heard it doesn't require a tune.

I can't tear the engine down every two years for the smog check here in California.

If you're going to build this car and keep it street-able, bite the bullet and register in Montana, no?

[roastbeef]

I had a friend that tried and insurance was a pain in the ass.

[SYT_Shadow]

Originally Posted by roastbeef

I was entertaining the thought of the more mild cam. I heard it doesn't require a tune.

I can't tear the engine down every two years for the smog check here in California.

It will still require a tune. But i don't see why having cams would automatically make you fail emissions.

A stock tune will adapt to either 284 or 292s somewhat, but you won't get the full potential.

I have 284s and BE springs sitting around from my original engine

[dogbone]

Originally Posted by dogbone

29 - everything is out of control. Please help.

Originally Posted by fsmtnbiker

This is the step I am (eternally) stuck on.

Yes, this is a tricky step for sure.

[dparm]

I thought the Montana thing was only used to avoid sales tax on the initial purchase? Or do you have the property tax on vehicles thing in your state? I was speechless when I heard about that...I couldn't imagine paying 2-3% on my vehicles every year. F that.

A lot of states have aggressively started going after people who try the Montana thing since it is gray area of tax evasion.

[SYT_Shadow]

Originally Posted by dparm

I thought the Montana thing was only used to avoid sales tax on the initial purchase? Or do you have the property tax on vehicles thing in your state? I was speechless when I heard about that...I couldn't imagine paying 2-3% on my vehicles every year. F that.
.

CT and MA have 4%... ask me how I know

The wonderful world of infinite taxes to be squandered by our politicians

[dparm]

[laughs in Texas]

[Ximian]

https://www.bimmerworld.com/Garage-S...nsmission.html

These are great for those of you with DCTs with the 20% discount.

[omgzirra_exe]

Originally Posted by roastbeef

I was entertaining the thought of the more mild cam. I heard it doesn't require a tune.

I can't tear the engine down every two years for the smog check here in California.

you'll still pass smog, the stock DME will adapt to it still. and you can still run it just not getting the full gains.

although different engine, i did pass smog on my s2000 which had a full header back system with high flow cat, a stroked F20C to F22C and cams. on a stock ECU lol, in which after smog i put the AEM back on.

if anything visually the car looked stock on top.

s2k ecu also self adapts over time.