my 200mph rx7 build

[turbotoaster]

The rear diffuser incorporates a venturi tunnel to create a venturi effect. The venturi effect is a phenomenon which is described by Bernoulli\'s equation. When a fluid, such as air, is flowing through a pipe, and is forced through a narrower section of pipe, the pressure decreases while the velocity increases. This is similar to the Bernoulli effect for enclosed conduits which states that the higher the velocity of a fluid, the lower the pressure.  Thus, as the air moves faster underneath the car and through the rear diffuser, it causes the high pressure air to push down on the car in order to reach the lower pressure air. This creates downforce which exerts a downward pressure on a moving vehicle and helps to counteract loss of control at high speeds.  The faster the vehicle is moving, the more downforce is created, so vertical bars split the air flow into more sections which in turn increases the velocity and downforce

[Grant Monkhouse]

^^^^^^^ that was what I was going to put! Lol.

This project amazes me all the time, I now wish I had thought about what I wanted to do with my car in the first place I stead of just modifying it. Having a goal for something in a project is what I will do from now on. Saves wasting money and makes learning about specific things for that goal more practical than trying to learn everything! Keep up the work toaster.  

Do you need any help with the fab work on the diffuser as I know a couple of welder fabricators that would help you out if I had a word with them?

[MaLicE]

seen a few of them demon tanks and they are nice, the weld work is spot on and for the money i have yet to see better...

[Panjy]

Just in case you have\'nt got around to removing the rear bumper bar yet, i had mine off today - and of course i weighed it like the saddo i am
 
6kgs, nice surprise that.
 
Bit of a pain in the ars* to get the bumper off - all boot interior trim & rear lights have to be removed to get to all the mounting fixings. I also ended up removing the electric aerial (0.83kgs by the way - i\'m gunna bin it & fit a bee sting to save 1/2 a kilo ) & abs ecu to get to the clip fittings that are hidden down inside the rear quarters.
 
Glad to see your gunna do some aero, was a bit worried about that side of your plans :Thumbs-up

[turbotoaster]

^^^^^^^ that was what I was going to put! Lol.

This project amazes me all the time, I now wish I had thought about what I wanted to do with my car in the first place I stead of just modifying it. Having a goal for something in a project is what I will do from now on. Saves wasting money and makes learning about specific things for that goal more practical than trying to learn everything! Keep up the work toaster.  

Do you need any help with the fab work on the diffuser as I know a couple of welder fabricators that would help you out if I had a word with them?

to be fair im not guaranting im going for this fuel tank and diffuser set up, this is just whats in my head, when i get paid ill cost everything out and see how it stands but at the moment it seems to make the most sense.

so ive got a new fuel rail arriving on monday which ill show pics of then the next update after that will be the end of the month

ill probably pop rivit the diffuser together as its the simpliest way, should cost about £80 worth of ali to make up.

seen a few of them demon tanks and they are nice, the weld work is spot on and for the money i have yet to see better...

thats good to hear, demon is actually about 5mins from my house, ive had a couple of things off him over the last year and ill probably get a few more things aswell.
Im sure this will be known as \'the ebay car\'

Just in case you have\'nt got around to removing the rear bumper bar yet, i had mine off today - and of course i weighed it like the saddo i am
 
6kgs, nice surprise that.
 
Bit of a pain in the ars* to get the bumper off - all boot interior trim & rear lights have to be removed to get to all the mounting fixings. I also ended up removing the electric aerial (0.83kgs by the way - i\'m gunna bin it & fit a bee sting to save 1/2 a kilo ) & abs ecu to get to the clip fittings that are hidden down inside the rear quarters.
 
Glad to see your gunna do some aero, was a bit worried about that side of your plans :Thumbs-up

wow, great bit of info there on the bumper bar, i had a look at the manual about how to remove the rear bumper and it looks a proper pain in the arse.

can you tell me the sequence you went through to remove it in your own words, will be usefull for me to have for when i attempt doing mine.

the 6kg can help offset the diffuser and pumps for weight:)

[Panjy]

No problem.
 
Jack the rear up a little and remove two nuts - one per side on bottom of bumper.
Open doors and remove both interior rear quarter trims.
Open boot & remove centre (washer bottle) trim.
Remove both left & right boot trims (will need the cabin rear quarters out first).
Unbolt abs ecu & move aside.
Unbolt electric aerial & move aside / remove.
Remove both rear lights.
Remove rear centre light section.
Remove number plate & support bracket.
Use torx set to remove bolts (x8) securing bumper top in light recesses & centre section.
Remove 2x nuts per side in inner rear quarter panels.
Unclip 2x plastic clips per side in inner rear quarter panels (be prepared to lose some skin!!).
Remove bumper.
Remove both foam sections.
Unbolt 4x bolts per side holding bumper bar to support brackets.
Remove bumper bar whilst carefully feeding wiring for bumper lights through gaps.
Remove 2x bolts per side holding support brackets on & remove brackets.
 
And she\'s all off :Thumbs-up  
 
The number plate lights are originally fixed to the bumper bar so a little bracket will need making up to fix them back on. Nothing that can\'t be knocked up with a single piece of ally plate though.

[turbotoaster]

anyway an update to keep it moving until i get paid.

I managed to get a great deal on a new secondary fuel rail, now im gonna be running 2x2200cc injectors and as these are top feed and not side feed like the stock ones then a new rail is needed.

Normally these are around £120 but a bit of hunting got one for £80 brand new!!!

Box comes so feel excited.


new shiny rail, fully anodised in red(to match the car) with nice little bit of engraving.
compare that to a really crappy £150 one that leaks from america and its a bargain.

You can just see the holes at the end of the rails for the injectors and the threaded connections for the fuel lines to bolt to(currently covered in tape for protection)

because the injectors are different shape than the stock ones you fit these sleeves to the injectors so you get a tight seal, hence it came with these, notice the little rubber rings to help seal

well thats it for now.

at the end of the month ive decided to buy my 2 fuel pumps, fuel tank and fuel pressure regulator, trying to get the main boxes ticked now!...will also rip a few kgs out of the car to keep me busy while im sorting the pumps out

[arrouk]

Did this ever get finished? It would be good to find out.

Matt

[S3TH]

^ lol you seriously have no idea?

[Grant Monkhouse]

Did this ever get finished? It would be good to find out.

Matt

Nope, didn\'t even get close. Crashed the car, decided to build a track car paying atomic Rex to build it for him, basically the biggest tight arse met the most expensive rotary car builder. Ended up in court between the 2 of them. That\'s as brief as I can do but there was a lot of crap involved in all of it.

[Grant Monkhouse]

Turned into this thread
http://www.mazdarotaryclub.com/forums/showthread.php?t=68261

[Grant Monkhouse]

Ended up with this
http://www.mazdarotaryclub.com/forums/showthread.php?t=68261