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Mid mount Brat racer

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9 replies to this topic

#1 docmidBratt



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Posted 17 March 2017 - 12:12 AM

Hi there

I,ve been racing for a few years now with my old 1989 Xsi Honda integra fitted with a integra type R motor, adjustable suspension and slick tyres.

And she goes pretty good and reliable.

The classes I race in have a time brake out, which I've managed to run to as I've got better and improved the car.

But in the last 2 years the brake out time has dropped 3 seconds.

Which doesn't sound like a lot but it is for my car.

I could turbo or super charge it, but then your looking at some serious money to keep it reliable.

Now the other car in my class are things like,

RX7 turbo and na

Mitzi turbo

Volvo turbo

V8 mustang with big power

6 cylinder cars (similar speed as my car)

a few Hondas (similar speed as my car)

So you can see fast cars.

So I was looking for something that would be a bit more competitive, with room to improve.

I've always liked subaru's and have owned a few over the years.

legacy, wrx, sti, forester, so why not a Subaru.

Good traction, pretty quick (would have to be an sti).

New fuel pump, exhaust and a link ecu, should make 220 kw at wheels.

But the problem is the price of and sti round the 1999 v5-6 model would set me back here in new Zealand

around $6000 to $10000.

Bit steep for my budget.

So while at one of the meetings I ran in someone with this little beauty.

Mid mount Subaru engine. 

So it got me thinking.

My brother got a few Brumby's (brat) at his place. Why not mid mount brumby with ej20t engine.



End of part one

Attached Files

#2 docmidBratt



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Posted 17 March 2017 - 01:47 AM

Pt 2

So it was a go.

Cheap (free) light, mid mount engine.

First step.

Strip it down,

The car has a bit of rust in it so will have to replace some bits.

Cut the rear deck out, remove petrol tank, remove guard.

#3 docmidBratt



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Posted 17 March 2017 - 01:49 AM

deck 1
deck 2


#4 docmidBratt



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Posted 17 March 2017 - 02:16 AM

Sorry about the post and images. getting used to things.

Anyway you can see the rust. But not a problem.

So we stripped it all back and replaced the rusted bits and she's looking good.

rear 3


Now while looking around for tips and tricks on the build I come across this site and the form = midengined RWD BRAT.

Some good things on that form and another site I found this picture

ej20 size
Good info of the size of the engine.
So as we where moving on we would need a dona car to nect thing off.
bingo, a 1996 legacy Gt twin turbo.
Been in a fight with a pool and the drivers door. $400nz driveable.
Ripped the front cross member and engine out and sat it in to see what's up.
test Fit 2


engine firewall
All good. enough room the firewall, not to mush room side to side.
Engine will fit in from the top if you remove the exhaust. Other wise from under.
Next thing was to reinforce the rails to handle the engine and suspension and arms.
Used 75x50mm box section. way better now.
Now you might think why not tube chassic the rear.
Well that's something left for the experts.
Its just me and my bro, We where brought up on a farm so we have things like welder, grinders and stuff like that around.
Luck my brother use to be a panel beater and has worked on a lot of cars and farm machinery, so big help.
Me, well I'm a mail man. but no my way around stuff aswell.
So a tube rear end would be best but we are doing this on a budget. small one at that.
So we desided just to use the front cross member as it was all setup to run everything.
End of part 2




#5 wallaby


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Posted 17 March 2017 - 02:35 PM


#6 docmidBratt



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Posted 17 March 2017 - 05:30 PM

So next step arm mounts and supports, gearbox mount,

Now for the arm mounts we mesured and mesured, and again to get the right distance between them.

Looking at the setup things didn't look right.

So we had a play and found if we just swapped the arm mount from left to right they would work better.

Arm mount
Next was to make some mounts for the arms. Bit of cardboard and stuff come up with these.
Look the part anyway.
rear Arm mount 2
rear Arm mount 1
And in place.
rear mount 5
rear mount 6
Next the cross member to support things.
Pictures to come.
And a teaser for the cab which will drop some jaws.
But where not at that point of the build.



#7 docmidBratt



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Posted 19 March 2017 - 09:02 PM

Right finished rear mounts. should be strong enough.

Finished mount
finished mount 1
Next we have to put a lower brace at the rear bottom of cab and weld some end caps for the rails.
Then the engine can go back in.
We have started the gearbox mount, just need to do final setup and weld in to place.
Gt engine
Gtb gearbox
The engine is a 1996 GT legacy twin turbo. We are going to use this engine as it was cheap and just to prove the concept will work.
The gearbox is a 1998 GTB legacy. To replace the auto that came in the donna car.
Got me hands on one of these kits from Bremar. Has a spline and a block off plate.
Nice kit, easy to fit, just had to drill the 9 bolt holes & the 2 pin holes out 1/2 mm and change the 9 bolts to shorter ones.
bremar Kit 2





#8 AdventureSubaru


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Posted 20 March 2017 - 09:22 AM

Great ideas here.


Any plans for structural bracing in the front? With all the weight in the rear and no motor etc. up front it would crumple like a tin can in a front collision.

#9 docmidBratt



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Posted 22 March 2017 - 11:13 PM

Hay thanks for the tip.

We are looking to do somthing in the front including some sort of fuel cell and some aero through the bonnet.

But I will check it with the guy who does the cage. He will point me in the right direction.

I've always put safety first.

Also with the seating.

In floor 1
You see i'm 6'3 and you will all no there isn't a lot of room in the cab.
So when you put a cage in it there's even less room.
So we had a think before we started the build and decided to make it a mid mount setting position also.
So a lot more room to move the seat forward so the cage and myself would fit no problem.
Again well have to figure out the steering.
But we have mocked up the peddles on a board and it seems quit good.

#10 docmidBratt



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Posted 22 March 2017 - 11:28 PM

tunnel 1

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