Zoners track day cars

[Brian28]

Had a car in build early on in the thread, roll cage just going in, this is how it ended up in race trim. Weld in cage, usual PBMW spec 318i. Photo is being squeezed up onto the kerbs at the Thruxton chicane. A hefty sump guard was part of the build luckily enough



This is the latest car, a 318is. Started off last autumn as a reasonably clean standard non sunroof car.




Don't have many build photos, but over last winter it got changed into this for TTRS.




SD cage
Coilovers
Lightened everywhere
Live mapped on RR (Thanks ShepsEvo3)
Uber light TD alloys
4.1 LSD (Thanks Gareth)
Coil on plug conversion
Fibreglass bonnet
970kg with quarter tank of fuel

Will be moved into the garage next week to be stripped down again to hunt for another 40kg weight to remove, will also be working on an R1 bike carb conversion with some cams so it should be a bit more pokey next season.

[MarkT]

Had a car in build early on in the thread, roll cage just going in, this is how it ended up in race trim. Weld in cage, usual PBMW spec 318i. Photo is being squeezed up onto the kerbs at the Thruxton chicane. A hefty sump guard was part of the build luckily enough



This is the latest car, a 318is. Started off last autumn as a reasonably clean standard non sunroof car.




Don't have many build photos, but over last winter it got changed into this for TTRS.




SD cage
Coilovers
Lightened everywhere
Live mapped on RR (Thanks ShepsEvo3)
Uber light TD alloys
4.1 LSD (Thanks Gareth)
Coil on plug conversion
Fibreglass bonnet
970kg with quarter tank of fuel

Will be moved into the garage next week to be stripped down again to hunt for another 40kg weight to remove, will also be working on an R1 bike carb conversion with some cams so it should be a bit more pokey next season.

970kg, now that's light. What have you removed to get it down to there?

[martinpallot]

Here's my effort an how it used to look:



1991 325 sport with chassis mounted S50 engine
Body currently undergoing a major rebuild, converted to LHD, bulkhead moved back 5 inches flat floors with exhaust tunnels either side, tall turrets, multipoint cage of my own design, sill stand mountings on all foor corners.














Brief rundown of the final spec:

Suspension:
-bilstein coilovers all round
-Group A front rose jointed arms, modified rear beam for camber correction

Engine gearbox and running gear:

-1994 S50 engine with Shrick cams of unknown duration
-elite IL300S 6speed sequential gearbox
-4.45 75% lock LSD with E36 back plate and diff cooler

Brakes:
-Front wilwood six piston calipers with 280mm discs
-Rear twin piston wilwood calipers with standard discs and seperate mechanical handbrake calipers.
- Custom made floor mounted pedal box

Wheels:

Group 4 revolution 8x15 with Dunlop CR311 tyres of various compounds

Misc:
-Polycarbonate bronze tinted windows
- Mk2 escort fuel tank in boot behind sealed firewall. 2 litre swirl pot and braided lines throughout
- Fibreglass bonnet and carbon bootlid
- corbeau seats and TRS 6 point harnesses
- Armtech electronic cuttoffs and lifeline 4 litre extinguisher system.
-DTM Vented mirrors
-Detachable font end for ease of engine removal

Sould be finished early next year

[e21Jason]

I like the quick lift mounts on the rear bumper, and your hiding half your skills based on the build thread on the rally forum

[nickso]

sheeeit thats good work.


i like that a lot. you have done everything that i want to do to mine but mine is a summer driver and the insurance on those mods just isn't worth it.

[Brian28]

970kg, now that's light. What have you removed to get it down to there?

Fibreglass bonnet on 4 pins so all of the front stuff cut away, original bonnet rear roller mechs and brackets gone, loads of odd redundant brackets and clips etc gone (eg the one that holds the spare wheel in place), original bumper shock mountings and inner linings gone, CoP conversion so original coil packs/brackets/plug leads gone, rubber door/bonnet/boot seals gone, rubbing strips removed, bootlid is outer skin only on bonnet pins so all hinges, brackets etc gone, conversion to manual windows and central locking binned so motors, door looms etc gone, few kg gone from the flywheel, power steering pump pipes etc all binned, 5.6kg race battery, drilled/grooved brake discs all round (every little helps ), basically anything not needed was got rid of and any brackets where no strength required were swapped for alloy (eg the one that holds the clutch fluid reservoir). Pro Race 1 alloys about 6kg each, and we run on 195/50 Toyos, so they are probably lighter than some other tyres. Still 40kg over minimum race weight though, so have a bit more to find hence the strip down for another look for redundant stuff over winter. Have a few ideas, but need to keep dashboard and glass (regs) and I want to keep the standard petrol tank and heaters as I drive it to and from races.

MartinPallot that build project looks incredible

[oo7]

Here is a couple of pics of my 325i at brands early this year

[rix313]

Just thought I'd update mine. Since last year I've fitted:
Wilwood 4pot calipers with 280mm discs
Brake bias valve in the cabin
Lifeline fire extinguisher
Smaller seude steering wheel
Cobra Suzuka pro seat
Refurbished front struts
New wishbones and poly M3 bushes
Rose jointed rear top mounts
-60mm SPAX springs
Z3 1.9 short shifter
Started test fitting a Rotrex charger instead of the Eaton.

[shaun_89]

This is my first proper track car and my first bmw







I brought it like it is, starting to plan the upgrades doing it chassis first engine last. And puttin the bumpers back on!

The spec as brought is :
Engine

2.5l 12valve Straight-6 (M20B25) high compression engine
Pipercross induction kit cone filter
Powerflow exhaust backbox
073 ECU with BBR Starchip

Transmission & Diff

Standard 5 speed gearbox
3.64 ratio BMW 325i Sport LSD
Uprated Z3M diff mounting bush
Renewed shift bushings with Z3 gear lever

Brakes

Front brakes have new EBC Yellowstuff racing pads
New solid rear disks with new pads
Goodridge braided flexible brake lines all round
Motul RBF600 DOT4 Racing brake fluid
ABS disabled
Hydraulic handbrake


Suspension

-60mm Jamex springs all round
Bilstein B8 front sport shocks
Avo adjustable rear shock absorbers (adjustable hard/ soft)
Powerflex E30 M3 eccentric front wishbone bushes
Powerflex rear trailing arm bushes
Powerflex rear subframe bushes
Manual steering rack
New front control arms.
Front anti roll bar (20mm)with secondary mounting
Rear anti roll bar (16mm) with new droplinks

Wheels & Tyres

Standard 15" BMW BBS cross spoke alloy wheels

Should be good fun out on the track, cant wait.

Im really pleased with rwd too, way better than fwd i was used to! Upgraded from my polo g40, it was much faster than the e30 on the straights (170+ bhp and sub 800kg weight) but just wasnt upto scratch in the corners/braking without spending way more money.

[MillRat]

Hey Shaun,

Do yourself a favour and either put the factory airbox back it, or move the pod filter as close as you can in behind the headlights, and make a cold air box for it. At the moment, it will only suck in the air that has passed through the radiator and past the engine (both will be considerably hotter than the ambient temperature). As it currently stands, you will be costing yourself lots of valuable power.

Also the Polo looks sweet.

[shaun_89]

Hey Shaun,

Do yourself a favour and either put the factory airbox back it, or move the pod filter as close as you can in behind the headlights, and make a cold air box for it. At the moment, it will only suck in the air that has passed through the radiator and past the engine (both will be considerably hotter than the ambient temperature). As it currently stands, you will be costing yourself lots of valuable power.

Also the Polo looks sweet.

Thanks i loved the polo, but just felt like time to move on.
Yeah i know about the filter, doesnt fit properly either so its winding me up.
Im not normally one for cone filters, do you reckon the airbox is better than any aftermarket closed induction system?

[MillRat]

Thanks i loved the polo, but just felt like time to move on.
Yeah i know about the filter, doesnt fit properly either so its winding me up.
Im not normally one for cone filters, do you reckon the airbox is better than any aftermarket closed induction system?

Personally, I prefer a cone filter with a good cold air box (that is why I have one on my race car). If you can't build a decent closed cold air system then stay with the very good factory airbox. Don't think though that you need to buy an aftermarket cold airbox though, as they can be easily made at a fraction of the cost.

I know what you mean about the polo. I have had cars I really enjoyed in the past, but felt that it was time to move on.

[Petrolthreads]

Loving this threads, here's mine

Before





After