Suspenceful's 135i Epic Build Thread

May 4, 2017
1,759
Plano TX
Are the factory M3 diff/axles/driveshaft proven to hold up to 800whp 2-step launches with a tire? I'm not well-versed on available diff options.
Tony Vargas hasn’t been able to break one even with his 800hp, dual clutch sequential doing 2 step launches.
 

langsbr

Lieutenant
Apr 5, 2017
746
Wow, the M3 setup is that strong? What is the allure of the 8.8 kit then? It's awful expensive just to have a wider selection of gears.
 
Nov 4, 2016
121
Sanford NC
:) I think a Motiv twin disc, axles, an LSD with a lockdown and some solid bushings are in my future. Yay for winter build.
Should look into getting a 3.15 diff and subframe dropout from an e92 M3. I think that's my plans for this winter. Get the bigger and stronger diff, subframe, suspension and stronger axles.
 
Apr 24, 2017
162
Should look into getting a 3.15 diff and subframe dropout from an e92 M3. I think that's my plans for this winter. Get the bigger and stronger diff, subframe, suspension and stronger axles.
that is probably my plan as well. in the future should you need the e92 m3 diff has plenty aftermarket options for stronger internals as well as different final gears. a 3.15 --> 2.93 ratio E92 M3 would be sick for 1/2 mile
 
Aug 1, 2017
365
Thanks for discussing rear end options. It's something I'm not as familiar with (yet).

Well, my clutch holds the 3-4 shift but doesn't hold up as well on the 2-3 shift. Since the 3-4 shift is fine, I wanted to test my 60-130 time again.

This was my best time BEFORE the shift bog fix.
44175192872_86ee49db47_c.jpg


This is my first try AFTER the shift bog fix.
44386051041_cb22e7218b_c.jpg


As you can see, I knocked off 0.3 sec with the fix alone! You can also see the blue line has much less lag in the middle (3-4 shift). The best part about this is that my 3rd gear was actually stronger in the "before" pull as you can see by the 60-70, 60-80, 60-90, 60-100 times. This means I picked up all of the 0.3 difference with the faster shift, and that there is even more on the table. I think with some fine tuning, I'll be able to get a very low 6 second pass on a cold night with a low tank of gas.
 
Aug 1, 2017
365
May 4, 2017
1,759
Plano TX
Still 1sec for the shift. Faster than the other one, but still a 1sec shift. I think you are at the limits of the 6MT synchro's at this point. Frame of reference. Factory 6AT shift is .600sec, and an xHP Stage 3 6AT is .400sec. Factory DCT is about .050sec and an M3 GTS flashed trans is about .010sec.

datazap-chart (1).png
 

doublespaces

Administrator
Oct 18, 2016
6,761
AZ

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