Jakob66 E92 M3 Time Trial Build

[jakob66]

That’s the car as of today. Best lap times so far at VIR 1.59.3 ; RA 1:31.1 ; WGI 2:01.6



The build started in 2014 as a 2013 DCT with 16k mls. Car was involved in front accident and the front frame was damaged.
After a new front frame and time on a chassis fixture the car was in better dimensional condition than it came from the factory.



Car fixed and in ‘like-new’ condition and bone stock after 2 months hard work.



In my past I raced motorcycles and my company prepared & developed
parts for German Touring car race series so it was just a matter of time
when I would find my way to the next track, lol.
In 2015 I started in HPDE. The following year in 2016 I started in TT3 with NASA (finished 2nd at WGI at the Nationals).
I like TT as it has a calculable risk and it combines speed with ‘brains’ and
it’s fun to race with very cool cars.
The car's development started in 2016 and is ongoing all the way to 2018.

ENGINE:
As of today the engine is still stock, stock rev limits, MachtSchnell
(heavily modified!) air intake and a BPM stage 2 tune. Engine cooling
air flow upstream (through engine hood) due to closed engine bay.
That development took quite some time! With larger oil cooler/radiator,
stock DCT cooler and with fender & engine hood vents engine temps
-even in hot +90F- are flat and oil temp never goes beyond 245F.
Electric power steering, no AC compressor, no serpentine belt.




I replace rod bearings yearly. Running Castrol 10W60 and change every other weekend (yes you heard right). That’s key as the long-chained 60W
loses viscosity quickly. Proper warmup is super important, I do never rev
the engine unless engine is at >200F engine oil.
My engine is not burning oil. BW motor mounts.

TRANSMISSION & Diff
E240 DCT software , no water/oil intercooler anymore (as AC is gone).
Never had too high transmission oil temps. However, my transmission doesn’t get the hot engine air flow.
OEM differential had too much slip so I got Diffsonline race diff with
BW diff cooler in trunk. Solid diff brackets. Diff works flawless.

SUSPENSION:
In 2015 I installed KW CS coils (perfect for street@track!).
They work really well for mixed track/daily use. That move came together with removing all ‘rubber’ in the suspension.
So I exchanged the differential and subframe mounts with Turner solid subframe mounts, BW
race car control arm conversion front/rear at the same time.




However, my car is no daily anymore and by the end of 2017 I switched to MCS 3-way with remote canister. Rear is non-coilover setup due to my fat
315/30 tires (which is needed).
The MCS took me a long time to get used to it but I believe car has now more grip. Ground control race camber plates. Running extreme camber values front and rear.
Spring rates are 900F/1100R. Due to my aero the rear spring rate is not
high enough at high speeds so I’m working on a new rear lower control arm
so I can go higher on spring rates and adjust spring rates via adjustable wheel leverage. It’s going to be a 2018 winter project.
R&D sway bars (front and rear) modified (for much higher spring rates front
and rear!).

BRAKES:
Stoptech ST60 fronts with Cobalt Friction XR1 brake pads and rear stock brake with XR2. Running Castrol SRF brake fluid. Here again, not cheap but
the best I had so far. I’m brake bleeding every other weekend.
If you want insane brake power that’s the choice! (though the pads are not
cheap).
We made the brake ducts in-house. We needed something solid that will
last.



EXHAUST:
Catless with in-house built x-section and rear end. Due to the diffusor there’s no space for large mufflers. Mufflers are in-line underneath car in front of rear axle.



As I’m at the very end of the TT3 10:0 Hp to weight ratio my target was to get max torque not necessarily max hp. Exhaust sounds insane.

WHEELS AND TIRES:
Fronts ARC8 Hoosier A7 in 295/30/18 . Rears with ARC7 A7 in 315/30/18 .
There’s not much space left inside or outside of the wheels unless you change track-width which would change scrub radius which I didn’t want to do.

AERO:
Stock front fenders but extended with winglet tray to guide air around front
wheels.
Extended GT4 front splitter extended with hangers through bumper on front
subframe. Completely closed engine undertray -full flat car length- to rear
diffuser extending 1 foot beyond rear bumper. Several air dams -full car
length- extending to rear diffuser.
GT250 67” rear wing. Smaller E46 rear view mirrors.
Many people talk about aero but to generate real measurable downforce is
quite an undertaking. The front splitter, the undertray with its air dams and
the rear diffuser is one system and each component depends on each other.
If one element in this chain is not right it won’t work.

Ride height
It needs to be perfect to make all the above work.
We spent many, many hours to find the right setup and then to actually
measure downforce. Obviously we don’t have a wind tunnel so we had to
come up with an alternative method. Measuring pressure
deltas is not easy and sometimes misleading.
We did it by measuring travel at given speeds and then use the known wheel
spring rates to reverse calculate the forces.



INTERIOR:
From day one had the problem with helmet clearance. We came up with a
super low profile bracket (laser cut) that enabled me to mount the Recaro
Racer brackets directly to the floor. Around 1” reduced seat height.



We further developed a very, very sturdy bolt-in harness bar that uses 6
points bolted to the chassis that requires zero welding, drilling and grinding.
The carbon door cards complement the looks.



Schroth 6-point belts, stripped interior, fire extinguisher system with 4
nozzles. In-house lightweight (not pretty lol) front dash with oil pressure,
oil temperature , water temp, differential oil temp, suspension travel
indicator (switchable to all sides), since 2018 AIM SOLO DL2 with Smarty
Cam 2 and direct CAN bus connection with all available data channels.



Weight balance! The car’s minimum weight with my dyno’ed average HP in
TT3 is 3570lbs (with me). Cross weight L/R balance is 50.0%. Static
front/rear 51%/49%. I had to add substantial weight in certain spots to get
cross weight right. The result is a very balanced car that is easy to drive at
its limits.
The car is a constant ‘brain’ project and under development.




We do install and sell all modifications listed!
Enjoy!

[warp10]

Lookin' good! Which diff are you running?

[roastbeef]

beautiful build. if you're willing to sell a set of the front fender vents, i'll be a customer.

also, what exactly did you do to "seal" the engine bay? are you talking about the general oem design, or did you improve upon it some? did you do any sheet metal air redirecting to the hood vents?
i ask because i was thinking about making an easily removable scoop that extends from the back of the fan shroud to the passenger side hood vents. i figure every little bit helps. might help more if the air is directed rather than just finds its was to the vents.

[slicer]

Fantastic!

[SYT_Shadow]

beautiful build jakob, I look forward to seeing more

By the way, it seems like you should be part of the Karbonius intake group buy. 6.5lb off the front of the car!

https://www.m3post.com/forums/showthread.php?t=1523882

[jakob66]

Originally Posted by SYT_Shadow

beautiful build jakob, I look forward to seeing more

By the way, it seems like you should be part of the Karbonius intake group buy. 6.5lb off the front of the car!

https://www.m3post.com/forums/showthread.php?t=1523882

SYT_Shadow
That's a beautiful looking carbon part. However, I heavily modified my intake for more ram-air so it wouldn't work for me.
Thanks!

[roastbeef]

can we see pics of your intake and underhood air management please?

also, the mirrors look like e36 mirrors with a plate over the gap... any more info on those?

i don't mean to bug, but i have always been fascinated with the more serious track builds and i'm going to have a ton of questions. lol

[b4hand]

I want those fender vents!

[Candide13]

For those of us who track a civilian E9x (ie like the one you had in 2015) what would be your estimate for attainable track times at Watkins Glen? I mean, a car that is basically stock and on tires like Nitto-01.

Cheers!

[xander_g]

That is one sweet build. Congrats on the great work already done and good luck with the build's future evolution!

[jakob66]

Originally Posted by roastbeef

can we see pics of your intake and underhood air management please?
yes , once finished , I'm still testing a new design .

also, the mirrors look like e36 mirrors with a plate over the gap... any more info on those?
E46 aftermarket mirrors covered with a pcs of carbon and Weathertech wind shield on upper door seam to get cabin pressure-waves down.


i don't mean to bug, but i have always been fascinated with the more serious track builds and i'm going to have a ton of questions. lol

thanks

[jakob66]

Originally Posted by Candide13

For those of us who track a civilian E9x (ie like the one you had in 2015) what would be your estimate for attainable track times at Watkins Glen? I mean, a car that is basically stock and on tires like Nitto-01.

Cheers!

Bone stock I guess you can do below 2:10 but that really depends on seat time at the track.
Thanks

[jakob66]

Originally Posted by warp10

Lookin' good! Which diff are you running?

It's Diffsonline Custom Performance Differential with 3 discs, custom angle.
...and I needed a diff cooler as I was burning the discs.

[jakob66]

Originally Posted by roastbeef

beautiful build. if you're willing to sell a set of the front fender vents, i'll be a customer.

I bought those vents and wrapped them around my fender by bending and stretching it a little bit.
http://n15design.com/product-categor...v=7516fd43adaa
Thanks

[warp10]

Which rain guards did you buy?

[Datka]

Originally Posted by jakob66

Bone stock I guess you can do below 2:10 but that really depends on seat time at the track.
Thanks

There is no way bone stock e9x m3 can do below 2:10.
I only say this because I have a lot of seat time in e92m3(stock and modded) at WGI and have seen too many nasty accidents there by those who tried to set HPDE records.
This track is a lot of fun but is also very unforgiving.

[jakob66]

Originally Posted by Datka

There is no way bone stock e9x m3 can do below 2:10.
I only say this because I have a lot of seat time in e92m3(stock and modded) at WGI and have seen too many nasty accidents there by those who tried to set HPDE records.
This track is a lot of fun but is also very unforgiving.

I did a 2:01.60 in 2016 with Hoosier A7 & KW Clubsport and it was my 1st time on the track. I think 2:10 is possible but I agree it would be challenging.

[lutfy]

Congrats mate! Finally broke 2 min marker at VIR What was the secret sauce this time around? Suspension dialed in?

With that time at VIR, its a question of time at WGI.

Excellent build!

See you in October (VIR)?

Lutfy

[lutfy]

Originally Posted by Datka

There is no way bone stock e9x m3 can do below 2:10.
I only say this because I have a lot of seat time in e92m3(stock and modded) at WGI and have seen too many nasty accidents there by those who tried to set HPDE records.
This track is a lot of fun but is also very unforgiving.

Its a tough time to beat. Best I could do there was 2:11:3 this was with camber plates, Bilstein shocks, Eibach springs and HR swaybar (front), PFC rotors and pads and 275 RA1s.

Stock power and weight wise yes but with above mods in place too. Camber is the best mod on this car (bang for buck laptime wise).

Stock car with camber plates and Hoosier R7/A7 possibly but with standard NT01/RA1 variety I'd be curious, but then I am a little conservative too.

Lutfy

[Datka]

Originally Posted by lutfy

Its a tough time to beat. Best I could do there was 2:11:3 this was with camber plates, Bilstein shocks, Eibach springs and HR swaybar (front), PFC rotors and pads and 275 RA1s.

Stock power and weight wise yes but with above mods in place too. Camber is the best mod on this car (bang for buck laptime wise).

Stock car with camber plates and Hoosier R7/A7 possibly but with standard NT01/RA1 variety I'd be curious, but then I am a little conservative too.

Lutfy

Well, I am running my street legal m3 with Ohlins R&T, ground control c. plates and ess vt1-550 SCer under 2:04 consistently on R7 tires, but stock car even with c.plates and NT-01 tires is not capable to brake 2:10 at the glen.

[Redd]

Massive project! Well done!

What hood vents are you using?

[dogbone]

Always nice to see creative builds!

How extensive is the gutting? When you say the car is 3570 with you in it, how much gas is in the car? Curious what the no-driver-no-fuel weight is.