My 200mph budget build

[silversurfer]

if i break the engine its very cheap to fix

rotors cheaper then pistons I guess

its very aerodynamic

Making it (frontal area) wider worsens that but whats its cd factor compared to a modern car

How high will this car sit from the tarmac?

 

[turbotoaster]

You are one crazy mofo but, fair play. Car looks like awesome fun to drive.

probably a bit daft asking yourself but have you any thoughts on diffuser height.

i always thought the higher the diffuser is(relative to the floor) makes it less effective per pund of air, but i have seen a few hill climb cars in germany running them quite high up, with long vertical strakes back down to the floor

im trying to decide whether to run it pretty high up...ie cut out the rear bumper now i have no fuel tank in the way or to run it under the bumper with a low rake angle.

i have been reading up and 10degrees seems to be a common mention, then 15-20 if its properly optimised and 30 for you f1 guys.

 

[turbotoaster]

rotors cheaper then pistons I guess



Making it (frontal area) wider worsens that but whats its cd factor compared to a modern car

How high will this car sit from the tarmac?

no need to buy forged pistons, rods, aftermarket cams, valves, crank etc


the cd is 0.29 and a frontal area of 1.69sqm on a standard car.

the car will run a flat floor and on the top speed run be pretty much as low as i can get it without bottoming out.

the diffuser will stick out past the bumper by about 3-4inches to help against air grabbing onto the back of the car as it exits

also all shut lines will be taped and no wing will be used

im thinking the extra 25mm each side on the front wings will be offset by the car being 80mm lower to the ground

then it will just be a track/race car, the larger arches are so i can get some decent width tyres on it to improve mechanical grip

 

[Lethagized]

Is that a stock front bumper with the sidelights and oil cooler passages bored out into one?

If so, then good idea!! The stock 92-98 spec bumper vents only cover about 50% of each cooler.

 

[Sparky]

probably a bit daft asking yourself but have you any thoughts on diffuser height.

i always thought the higher the diffuser is(relative to the floor) makes it less effective per pund of air, but i have seen a few hill climb cars in germany running them quite high up, with long vertical strakes back down to the floor

im trying to decide whether to run it pretty high up...ie cut out the rear bumper now i have no fuel tank in the way or to run it under the bumper with a low rake angle.

i have been reading up and 10degrees seems to be a common mention, then 15-20 if its properly optimised and 30 for you f1 guys.

Would need the dimensions of the diffuser really,also if your floor isnt totally flat[or tuned] the diffuser will have limeted gains. What have you done to the front to direct air to the rear [floor wise]?

 

[Overlag]

im sure i read somewhere that the max angle before you start stalling a defuser is about 16degrees...

like Mark said though, you may need to make the underside totally flat to get real gains from the defuser?

 

[turbotoaster]

Is that a stock front bumper with the sidelights and oil cooler passages bored out into one?

If so, then good idea!! The stock 92-98 spec bumper vents only cover about 50% of each cooler.

yes it is, good thing about the original bumper is its fitment and also flexability compared to fibreglass after market ones

ill be running one giant single cooler one side and then put an airfilter in the other side, havent decided what size im going to use yet, probably 44 row

Would need the dimensions of the diffuser really,also if your floor isnt totally flat[or tuned] the diffuser will have limeted gains. What have you done to the front to direct air to the rear [floor wise]?

the idea will be will to run a ali splitter at the front with bolts onto my lip under the bumper, it will protrude about 3-4inches all around.

it will then go back to the rear of the subframe, with a small cover to access the sump plug.

the ali will then travel the full length of the vehicle to the diff, where from there i was thinking of starting the diffuser piece.

so in theory the air should manage to get there unimposed, the only thing i need to think about is maintaining the air under the car and not letting it spill out of the sides, so some sort of sideskirt maybe....im thinking the vertical strakes similar to the williams in the ground effect days.

you guys have helped out a time attack guy with an impreza recently and i noticed you had added that to his car, also his diffuser was very low to the floor and looked similar to a f1 design

 

[turbotoaster]

quick little pic update, these came today, very light, havent decided whether to fit them to my wings or my doors yet.

to show how small they are, every little helps when your trying to get 300kg of a chassis this small!

spoke to my builder today and they are sorting out the intercooler sometime this week if they arnt to busy, 4in outlet from the cooler, should help me run lower boost into the engine but maintain the volume(if anybody needs to know the reason for this let me know)

 

[ng93]

epic thread and epic car

any more updates? would love a ride in it when its done

 

[turbotoaster]

old car getting stripped, you can see the bent front end

diff removed

looking underneath makes me realise how much it will benefit from a flat floor, also you can see the old metal bumper bar, that wont be put on the new car!

new car on a dolly to make it easier to move around

engine out, since this pic, we have also removed the power steering system, and ignition system so it can be remounted in a cooler area

all my parts, they will be shot blasted and painted and new poly bushes and solid mounts throughout

 

[Gaijin]

Good man, keep up the progress and don't forget to keep us up to date!

 

[mk1_salami]

Love reading this. Keep us updated.

 

[turbotoaster]

cheers guys, i keep slowly plugging away at it

 

[chad116]

Must admit, Looking good

 

[Joshy]

If only I had a workshop like that to play in .

Are you still doing the work yourself or are you letting someone else do it?

 

[turbotoaster]

when the accident happened i lived in a town house on a main road with no garage so it would be impossible to do it there.

Hence i sent it to a rx7 specialist who is building it now.

Once its built up enough to move on its on steam ill be bringing it home to my new house, put it in the garage and finish it off.

things like mirrors, all aero work, wheels, different coilovers, fitting seats, methanol injection, big turbo etc will all be done at home to save money


though i tried to change the title of the thread as its not really a budget build anymore

 

[ng93]

Any updates on this?

 

[turbotoaster]

powdercoated subframes

initial engine fitment, once everything is in the right position, it will be stripped to a bare shell, painted then final reassembly, saves knocking new paint

intercooler and rad test fitted, this has later been revised to different end tanks, those are 4inch pipes

subframe on

quick test for ground clearance on rad

 

[turbotoaster]

shot blasted suspension

quick layout

front suspension bolted up, teins+hubs blasted and painted

34 row oil cooler

rear suspension and transmission fitted, rear pumpkin is being shot blasted and painted

GRP doors, bit dusty currently, but very light!

GRP dash, turns out its identical weight to the carbon version which is nice

nice and wide at the rear

 

[Gtiracer]

absolutely mental, I bet your excited to see it coming together