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Author Subject: Mazda powered 306 race car build
crf450

Senior User

Location: belper

Registered: 23 Mar 2005

Posts: 502

Status: Offline

Post #1
I'm starting a thread on the work I've been doing over the last 12months on my track not so soon to be race car.
For anyone that doesn't know this is the car I've been doing trackdays in for a while and made regular visits to the Ring with (see Ringtaxi vrs 306 vid on youtube).


The original plan was to rebuild the car to enter in class E in the LMA but after seeing my mate finish at the front consistently in his 500bhp Scooby I decided to take the car in a different direction and run in his class. To do any good in class A I'll need to lap in the same time as the latest the touring cars.
The car has been on a serious diet and my target weight is 850kg's. Even though I'm aiming for this weight I'm trying not to compromise any of the cars road/track orientation as I was happy with the way it turned out in its first incarnation and I want it to remain road legal to take back to the Ring.

Basic spec over what was already there is as follows from back to front.
Re-built beam with rear mounts removed and custom made front mounts to raise the beam in the car 37mm.
Titanium 30mm ARM
Titanium 25mm TB's
Titanium trailing arm pivot tubes
Titanium bolt on offset shim adjustable stub axles for toe and castor (these also give Maxi track)
Solution F ex-touring car shocks (not sure how good these are gonna be after back in the day touring car teams junked them and went for Penski's but I've got back up with them and I'm hoping I can make them work as they were a bas**rd to fit)
Home made bigger diameter discs with Willwood single pot callipers
Lightened beam tube (4mm machined off diameter)
Beam weighs in at 50kgs compared to a std beam which is 70kgs when its got uprated ARB's and TB's.
Fibreglass tailgate with shaped plastic glass.
Alloy fuel tank with built in swirl pot
Drycell battery
Re-mounted Safety devices caged tied in with rear beam.
Body shell lightened wherever possible.
Lighter seats
Heated front screen
Fiber glass bonnet
315mm bell mounted rotors with AP callipers
AP alloy master cylinder
Adjustable bias valve
Lightened 406 front uprights with titanium adaptors to restore geometry in wishbones
Extended taper roller brg bottom arms to achieve Maxi track with titanium rose joint adaptors
Titanium drive flanges
Titanium drive shafts
Titanium steering rack arms
25mm Titanium front ARB
Alloy bodied Avo mono tube coilovers mated to my own adjustable top mounts(this stuff is hasn't changed)
17 by 9 ATS wheels
Arches TBA
Engine 400bhp transverse mounted 13b Mazda rotary engine mated to straight cut Pug box

I've got loads of other stuff planned but I'll bring you details on that at a later date.
Cheers Martin

Pics of beam ready for fitting.
http://cid-10dc615cbae1729b.skydrive.live.com/self.aspx/New%20album%20^52^6/Picture%20320.jpg

http://cid-10dc615cbae1729b.skydrive.live.com/self.aspx/New%20album%20^52^6/Picture%20318.jpg

http://cid-10dc615cbae1729b.skydrive.live.com/self.aspx/New%20album%20^52^6/Picture%20317.jpg

http://cid-10dc615cbae1729b.skydrive.live.com/self.aspx/New%20album%20^52^6/Picture%20315.jpg

http://cid-10dc615cbae1729b.skydrive.live.com/self.aspx/New%20album%20^52^6/Picture%20316.jpg

________________________________________


Quote "da g man!"
"You've only got to watch the "306 vs ringtaxi" video & you soon realise how good these mod's are! That guy is running Ash's 30mm ARB, Solid Mounts & 23mm Torsion Bars & some adjustments on the camber. Admittedly, the guy is an awesome driver, but it just go's to show how well these cars can handle with the right modification's
Posted 4th Oct 2009 at 00:50
phillipm

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Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,601

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Post #2
Have you thought about adding a bit more titanium, I don't think you've got enough?

I'd got a set of those Wilwoods going spare you could have had cheap Doh LOL

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
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Posted 4th Oct 2009 at 00:54
crf450

Senior User

Location: belper

Registered: 23 Mar 2005

Posts: 502

Status: Offline

Post #3
f*ck my pictures haven't worked,I can make stuff out of metal but I'm crap with PC's. Can anyone help me out?

________________________________________


Quote "da g man!"
"You've only got to watch the "306 vs ringtaxi" video & you soon realise how good these mod's are! That guy is running Ash's 30mm ARB, Solid Mounts & 23mm Torsion Bars & some adjustments on the camber. Admittedly, the guy is an awesome driver, but it just go's to show how well these cars can handle with the right modification's
Posted 4th Oct 2009 at 00:53
crf450

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Location: belper

Registered: 23 Mar 2005

Posts: 502

Status: Offline

Post #4
phillipm wrote:
Have you thought about adding a bit more titanium, I don't think you've got enough?

I'd got a set of those Wilwoods going spare you could have had cheap Doh LOL



I wish I hadnt used them as you cant get decent compounds for them.

________________________________________


Quote "da g man!"
"You've only got to watch the "306 vs ringtaxi" video & you soon realise how good these mod's are! That guy is running Ash's 30mm ARB, Solid Mounts & 23mm Torsion Bars & some adjustments on the camber. Admittedly, the guy is an awesome driver, but it just go's to show how well these cars can handle with the right modification's
Posted 4th Oct 2009 at 00:59
phillipm

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Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,601

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Post #5




________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
Posted 4th Oct 2009 at 01:00
phillipm

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Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,601

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Post #6
crf450 wrote:

I wish I hadnt used them as you cant get decent compounds for them.


I can Whistle

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
Posted 4th Oct 2009 at 01:00
crf450

Senior User

Location: belper

Registered: 23 Mar 2005

Posts: 502

Status: Offline

Post #7
Ta for thatWink

________________________________________


Quote "da g man!"
"You've only got to watch the "306 vs ringtaxi" video & you soon realise how good these mod's are! That guy is running Ash's 30mm ARB, Solid Mounts & 23mm Torsion Bars & some adjustments on the camber. Admittedly, the guy is an awesome driver, but it just go's to show how well these cars can handle with the right modification's
Posted 4th Oct 2009 at 01:07
phillipm

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Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,601

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Post #8
LOL

We have them custom made for the buggy,

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
Posted 4th Oct 2009 at 01:08
crf450

Senior User

Location: belper

Registered: 23 Mar 2005

Posts: 502

Status: Offline

Post #9
What buggy's that?

________________________________________


Quote "da g man!"
"You've only got to watch the "306 vs ringtaxi" video & you soon realise how good these mod's are! That guy is running Ash's 30mm ARB, Solid Mounts & 23mm Torsion Bars & some adjustments on the camber. Admittedly, the guy is an awesome driver, but it just go's to show how well these cars can handle with the right modification's
Posted 4th Oct 2009 at 01:10
allanallen

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Location: Buxton

Registered: 01 May 2007

Posts: 1,399

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Post #10
Beam looks awesome now its together, perverted attention to detail Cool

Was the hub set-up your own design?

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Posted 4th Oct 2009 at 01:11
phillipm

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Location: Rotherham

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Post #11



That one.

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
Posted 4th Oct 2009 at 01:12
c.a.r.

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Location: Stevenage

Registered: 27 Jun 2008

Posts: 2,211

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Post #12
Is the engine in yet? I want more pictures! Sounds lovely.

Sounds like an expensive shopping list you have there...

________________________________________

'99 1.8 XS - Sold
'00 GTi6 - Killed by armco
'01 Cabriolet 1.8 - Sold
'96 Eunos Roadster 1.8 Import
Posted 4th Oct 2009 at 01:13
willygti

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Location: Exeter

Registered: 08 Oct 2007

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Post #13
Phil you're already spamming his thread with your bongo van.

That is beam porn though Martin Love

________________________________________

Team Ducati 748
2003 Subaru Impreza STi
Posted 4th Oct 2009 at 01:13
dr-evil

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Location: Crewe

Registered: 20 Oct 2006

Posts: 901

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Post #14
Mmmm tasty, i like it...sounds like its gonna shift. Nat asp or turbo'd ?? Either way it'll sound Love

________________________________________

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Posted 4th Oct 2009 at 01:17
phillipm

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Post #15
willygti wrote:
Phil you're already spamming his thread with your bongo van.


2 rotary engines in one thread Thumbs up

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
Posted 4th Oct 2009 at 01:21
phillipm

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Registered: 15 Oct 2006

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Post #16
dr-evil wrote:
Mmmm tasty, i like it...sounds like its gonna shift. Nat asp or turbo'd ?? Either way it'll sound Love


Turbo I would have thought, it'd be very difficult to get 400bhp out of an N/A 13b, 300bhp is a good race-spec...

Weren't you tempted to make the torsion bars + arb's hollow to save some more weight?

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.
Posted 4th Oct 2009 at 01:32
davedgti6

Seasoned Pro

Location: whiston, prescot

Registered: 28 May 2006

Posts: 1,651

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Post #17
Wow thats a proper job, makes my rear beam rebuild/upgrade look like childsplay, top work there fella :impressedsmiley

________________________________________

Team Supercharged Gti-6 Ninja
Posted 4th Oct 2009 at 02:07
buzzbrightyear

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Location: hiding all receipts for car

Registered: 09 Jul 2008

Posts: 11,894

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Post #18
not quite standard that gti6 then is it??
nice project mate.

________________________________________

andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 4th Oct 2009 at 02:12
SteviePut

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Location: Down south

Registered: 20 Oct 2005

Posts: 13,637

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Post #19
phillipm wrote:
dr-evil wrote:
Mmmm tasty, i like it...sounds like its gonna shift. Nat asp or turbo'd ?? Either way it'll sound Love




Weren't you tempted to make the torsion bars + arb's hollow to save some more weight?


How would that work Phil?Blink Would a, for arguments sake, 25mm hollow torsion bar be as stiff as a solid one of the same dimensions? Or would you have to go thicker still to get the same stiffness?

________________________________________

My old man wrote me a letter from prison once. It said if you don't want to end up in here, stay away from crime, women and drugs. Trouble is, that don't leave you much else to do, does it?
Posted 4th Oct 2009 at 02:21
crf450

Senior User

Location: belper

Registered: 23 Mar 2005

Posts: 502

Status: Offline

Post #20
Phil,I didn't consider making any of the bars hollow because I wanted a set-up that was based on my original set up which I think worked,the titanium I've used has very similar properties as 24t which my steel bars were made from. You could probably make a hollow ARB but off the top of my head I'd of thought if you made hollow titanium TB's they foul the beam tube. I like your thinking though.
Allan,I would say I didn't consciously copy anything but I do know that Clio cup cars run a set up on the back that they can adjust with shims.
The engines not in yet, I did have it mated to a V6 box but I since bought two std case straight cut box's so I'll need to make another adaptor plate now.
The engine has a single turbo and came out of my mates RX7,it made 407bhp with shoddy pipework I'm sure when I've tidied it all up it'll be near 420bhp.
Cheers for comments.

________________________________________


Quote "da g man!"
"You've only got to watch the "306 vs ringtaxi" video & you soon realise how good these mod's are! That guy is running Ash's 30mm ARB, Solid Mounts & 23mm Torsion Bars & some adjustments on the camber. Admittedly, the guy is an awesome driver, but it just go's to show how well these cars can handle with the right modification's
Posted 4th Oct 2009 at 02:28
rapidcossie

Regular

Location: falkirk

Registered: 30 Jun 2009

Posts: 332

Status: Offline

Post #21
what engine is in the car in the ring taxi video?

I cant believe how quickly you catch the taxi and the m coupe etc after the long straights thru just one or two braking areas!
Posted 4th Oct 2009 at 02:42
SteviePut

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Location: Down south

Registered: 20 Oct 2005

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Post #22
rapidcossie wrote:
what engine is in the car in the ring taxi video?

I cant believe how quickly you catch the taxi and the m coupe etc after the long straights thru just one or two braking areas!

I believe it was almost standard. May have had cams in but that was it.

________________________________________

My old man wrote me a letter from prison once. It said if you don't want to end up in here, stay away from crime, women and drugs. Trouble is, that don't leave you much else to do, does it?
Posted 4th Oct 2009 at 02:45
steve954

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Location: norwich

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Post #23
rapidcossie wrote:
what engine is in the car in the ring taxi video?

I cant believe how quickly you catch the taxi and the m coupe etc after the long straights thru just one or two braking areas!
i belive its standard, can't say that about the rest of the car though.LOL

________________________________________

stevie
09 308 gt140 cc
03 octavia vrs

IF IT AIN'T BROKE, IT AIN'T A GTI6
Posted 4th Oct 2009 at 02:46
rapidcossie

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Registered: 30 Jun 2009

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Post #24
that vid is crazy if its a standard engine.

Gti6's are good cars but they aint THAT good!

Posted 4th Oct 2009 at 02:50
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #25
cams but not mapped or dialled in, to 175-180 bhp at the most, shows how much speed they can carry when setup well.

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Posted 4th Oct 2009 at 03:05

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