93 Mirage Cyborg R (race car)

Bart · **Posted:** 17 Dec 2003 08:08

1993 Mirage Cyborg R CA4A

Engine 4G92
Jun type 2 camshafts
Jun valve springs
Jun adjustable cam gears
Stock titanium retainers
Mild ported head
Match ported inlet manifold
65mm bored throttle body with modified ISC port
0.4mm MLS head gasket (results in 12.3:1 compression)
Standard Pistons and Rods
ACL Race Bearings
ARP head studs
Ralliart 71deg Thermostat

15 Row oil cooler plumbed with Earls fittings and Earls Pro-Lite 350 Hose (AN-10)
Perma-cool Oil thermostat

Aluminium cold air box
K&N pod style air filter
Racetech aluminium 1L oil catch tank

Haltech E6X ECU (sequential injection)
Magnecor KV85 competition ignition leads
NGK Iridium Spark Plugs
390cc injectors
Sard 1:1 fuel pressure regulator & liquid filled gauge
Walbro 255lph fuel pump
Evo3 fuel tank

RPW 4-1 Race design headers (or Cusco 4-2-1)
63mm (2 1/2") Straight exhaust system (only one 45 deg mandrel bend)
19" + 2 x 16" Coby mufflers

Transmission 5 Speed manual
Factory LSD gearbox
Jun 5.1kg CrMo Flywheel
Exedy Sports Tuff HD clutch with organic plate
Momo competizone shift knob

Suspension & Steering
Ohlins adjustable front shocks
Cusco adjustable pillow ball front upper shock mounts
Nolathane front anti-roll bar bushes and links
Koni Sport adjustable rear shocks
Tein pillow ball upper rear shock mounts
Ohlins springs front and rear (unknown spring rates)
Cusco 16mm 3 position (120%,160%,200% harder) adjustable rear swaybar
Nolathane rear anti-roll bar bushes and links
Steel Strut braces front and rear are welded in
Solid urethane engine mounts

Brakes
2 Pot front calipers (Evo3)
15/16th master cylinder (Evo3)
Znoelli S6 276mm slotted vented rotors front (Evo3)
Znoelli S6 260mm slotted solid rotors rear
Goodrich stainless braided flexible brake lines
Mintex 1155 competition brake pads (front and rear)

Wheels and Tires
Volk Racing forged TE37 15x7
Toyo RA1 205/50 Tires
Mugen forged alloy wheel nuts

Electrical
Autometer ProComp Ultra-lite gauges; A/F ratio, oil pressure and battery voltage
LED shiftlight controlled by ECU
Innovate Motorsports LC1 wideband 02 and LMA3
Graytronics 129 Intercom
Battery isolation switch
Odyssey sealed battery
Rewired for minimum weight

Interior and Body
Mitchell Motorsports CrMo rollcage
Racetech 4000W seats
Racetech aluminium seat mounts
Racetech Pro 5 point camlock harness
Lexan MR10 polycarbonate side and rear glazing
Aluminium interior door cards over Aluminium door frame
Aluminium bonnet pins on bonnet and hatch
Aluminium bonnet stay
Aluminium radiator cowling
Reinforced front bumper/splitter
Kevlar composite sump guard
Relocated windscreen washer tank
Removed air conditioning, heater and blower motor
Lightweight demist fans
Carbon fibre roof vent
Removed soundproofing, carpet, interior panels
Weight reduction on doors, bonnet and hatch and body shell
Manual side mirrors
1kg fire extinguisher

Service Parts and Fluids
Spark plugs: NGK BKR6ES
Engine Oil: Penrite HPR15 (15W60)
Oil Filter: Ryco Z411
Gearbox Oil: Redline MTL
Power Steer Fluid: Castrol ATF
Brake Fluid: Motul RBF600
Radiator Fluid:Nulon Ultra Cool

Kerb weight: ~900kg (full tank)

Best ET 14.01@159kph 2003 iDrag Nationals, 1st place Class AF/N (1600cc Front Drive/ Natural Aspirated)
Note: this time was run before the car had rollcage and only HEI mods, chipped ecu, stock cams and lots of weight reduction.

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Bart · **Posted:** 02 Feb 2008 16:30

Had the car weighed and it came in at 884kg with just under a 1/2 tank of gas and in standard race trim (ie both seats/harness's, fire extingusher etc)

With a few more obvious weight reduction measures (bonnet, hatch and bumpers in frp, and a light weight exhaust system) I'm sure closer to 850 is attainable.

Bart · **Posted:** 15 Feb 2008 19:04

Upgraded the front swaybar bushes and links with nolathane parts. This involved dropping down the front sub frame far enough to be able to access the shells, not an easy job by any means. Getting the old ones off was not so bad, but putting the new ones on and then trying to getting the shell/bolt to mate up was 'difficult'.
The factory rubber bushes where all but perished (might explain the knocking sound) so I'm hoping this will make quite a noticeable difference.

Bart · **Posted:** 03 Oct 2008 14:44

Finally started fabricating the new exhaust system, didn't have much choice really since there was a hole in the muffler anyway and it wouldn't have a passed a wof.

As usual its all about removing weight. The original system weighed in at 17.5kg, the pile of replacement tube and mufflers weights in at 9kg

. Also there will probably be another 1/2 a kg gone once I grind off all the original hanger brackets since most of these are now redundant. There was about 1/2 a kg weight difference between the new EVO3 fuel tank and the factory cyborg one. I've gone back to the Cusco 4-2-1 Headers, mostly because they fit properly. The mufflers will be mounted towards the back of the car to try and improve the weight balance a bit. I'll post some images once I finish welding in a few days time.

Kirby · **Posted:** 05 Oct 2008 03:07

not too sure if i should reply to the thread but here goes.

What is the weight of the stock tank. Could there be weight savings in using a fuel cell considering
1. you have to build a metal box to fit it through the floor,
2. most clubs require hatches to build an enclosure around the fuel cell to isolate it from the cabin
3. is there much benefit to the evo 3 tank other than the 1/2 kg and being able to run the muffler straight thru the centre of the car????

Bart · **Posted:** 05 Oct 2008 10:36

The stock tank weighs 10.5kg excluding the fuel pump. I'm sure a fuel cell would be a lot lighter since they are usually made of plastic but like you say there is a lot of work involved in fitting etc, the evo tank just bolts right up. Not to mention evo tanks are easy to get and cheap.

GodSpeed · **Posted:** 12 Oct 2008 18:20

bro... how many horsies this monster squeezed out..??? nice machine u got there...

Bart · **Posted:** 13 Oct 2008 07:59

I'll go for another dyno run when I finish the new exhaust.

Bart · **Posted:** 30 Nov 2008 17:09

So it turns out two 16" coby mufflers are 'too loud' for wof. I could have argued that because I have a Authority card, its exempt from the 95db limit if its being driven to or from an event and I'll take my chances the rest of the time. Didn't feel it was worth really arguing my case, esp since the wof guy didn't even know of this exemption.

In all honesty tho, its deafening inside the cabin (was the first time I'd driven it on the road) so I'm simply going to add a 3rd 16" or whatever 2nd they have to have at the time. Hopefully that will help. I have to say the 2 1/2 straight system 'feels' noticeably faster by the seat of my pants o'meter but its very very loud.

Also had a split steering rack boot, so its back onto the stands.

mivec_bwoy · **Posted:** 01 Dec 2008 16:00

custom air box looks neat...built it yourself?

Bart · **Posted:** 01 Dec 2008 17:59

Yep. Its got a big K&N pod filter in it.

mivec_bwoy · **Posted:** 02 Dec 2008 14:00

still got the sketch/stencil with dimensions on it? or is it possible to remake one to scan and share the design. i'm interested in building one for mine just like that

Bart · **Posted:** 12 Dec 2008 15:57

No Sorry, I don't have any drawings for it. I just made it up as I went along.

The car is still very loud with a 19" and two 16" coby/hotdog mufflers, I wouldn't recommend building a system using only straight through mufflers, at least not if you only have 2.5" pipe and no bends. They do a great job removing high frequencies, but nothing down low so there is plenty of deep bass, it sounds great, not at all like a typical jap street racer.

Cameron · **Posted:** 12 Dec 2008 18:08

Dambit, i thought i would get away with my 2.5 inch stainless jap exhaust with just a muffler but sounds like im going to be way off

Bart · **Posted:** 13 Dec 2008 08:24

Those cannon mufflers come with 'silencer' pipes tho, which have about a 1.5" hole in them and that makes them fairly quiet. I made a silencer pipe too now, and it almost sounds like a standard car but it passed a wof. They are REALLY strict on noise

I only used coby's because the coby factory is in hamilton so can get 2nds for 1/2 price. I'll probably get sick of the noise and replace the last coby with a box muffler of some sort.

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93 Mirage Cyborg R (race car)

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