The 12,000rpm Subaru called Betty 😲 | Built by GotitRex

One of the leading Subaru performance specialists in Australia, GotitRex has the runs on the board when is comes to fast street and race Subaru boxer engines, in both four and six cylinder applications.

Their latest R&D project known as Betty, has certainly peaked our interest, so we jumped in for a ride and were thoroughly impressed with the results. The de-stroked EJ engine sounds incredible and screams north of 10,000rpm with ease, boosted by a Garrett GTW3884 turbo that peaks at around 40psi and holds a flat power curve from 6000rpm onwards.

As the chassis is essentially a test rig, the 5spd gearbox was already fitted, and long term isn’t expected to live. However due to the nature of the high revving engine and combined with the factory gearing, this equates to around 225kph or 140mph in 3rd gear alone. With a kerb weight of around just 1100kg, the car essentially feels like your inside a 4-door motorbike.

At present the guys have logged around 80 power runs on the dyno plus street and track use, the engine has so far held up to everything thrown at it. This point of this car was to think outside of the square, bringing theory into practice and try something different on a flat four boxer engine.

1994 Subaru Impreza LX
Custom de-stroked EJ R&D engine by GotitRex
Garrett GTW3884 Gen 1 turbo @ 42psi
Link G4 EFI, E85 fuel
Subaru 5spd gearbox, Cusco diffs
Power: 600+whp
Max RPM: 12,000

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[HomebrewSubaru]

I am VERY impressed. That the highest revving Subie boxer I've seen.

[gssteve]

De-stroking lowers maximum piston speed for any given rpm, lightweight parts and scrupulous balancing keeps the harmonics in check(although a flat-4 is an inherently balanced engine anyways)....the biggest challenge was probably oiling and valve train control.
Thumbs up here, and I'm not even a Subaru fan! Something different and a bit insane all in one.

[tuitaco]

that motor with a sequential box would be the tits, sick build

[pokinacha]

When that thing throws a piston, its going to be heard a long way away. Impressive stuff tho.

[aintaintaword]

On the track, that was such a great sound... Music to my ears. You can almost feel that surge when the gear changes and turbos start spooling up, along with that glorious noise... Ahhhh

[autotopica]

Reminds me of takumi's Silvertop engine in the AE86

[jaggass]

VTEC kicked in yo.
Subaru Impreza called Betty: Hold My Beer.

[Garage]

I have always wanted to do an insanely high RPM NA Subaru build, but they did it with a turbo. Maaad!

[fullboost]

The de-stroked EJ engine sounds incredible and screams north of 10, 000rpm with ease, boosted by a Garrett GTW3884 turbo that peaks at around 40psi and holds a flat power curve from 6000rpm onwards.

[vincebastier]

12000 rpm 👀👀👀👀👀👀👀 the dudes are serious.

#RevToTheMoon

[rommelkarununganjr]

i died when i saw the my name is Betty sticker. such a good movie reference! the ride is killer too!

[eddierotary]

Sound like a bike, doesn't even have that Subaru sound at all

[slofouru]

Nothing wrong with dropping the torque and getting the power back with rpm, so long as the oiling system is proper and the engine management is top notch.

[bronzoso]

From now on, you shall call me... Betty.

[revengefullobster]

Beastly! Mine only makes 470, but I only have the boost set at 29 psi right now, I don't think I'd ever push it that far even though it's built to take it.

[audreysnailham]

This makes me squirm with happiness 😂 that sound ❤

[emdae]

Fullboost can you find out if you can possibly do an update on this car?
If its still around, would be good to see where its at!

[Entity_BlackRed]

Not even a Vtec revs that high!!! Impressive!!!!

[aaronjohnmaughan]

This is into 80's era F1 turbo territory, in the boost and rpm departments at least. Turbo era F1 cars made more overall power, but to turn this speed takes some know how.

Did I miss the footage of a tach showing 12, 000 rpm?

[HEXAN-SC]

Betty and the GT3 RS are my inspiration for my EJ25 going to be 300hp 10k rpm with the stock auto transmission (I’ve seen plenty of builds with it and i know she’s strong enough) one day I’ll have something as nice as Betty amazing car