CR-X + RWD + Turbo = A Honda Surprise
A 20-Year Journey

“If only it was rear-wheel drive.”

I can’t tell you how many times I’ve heard or read that phrase during a discussion about a Honda. But whether it’s a Civic, Integra, Prelude or an Accord, there’s a lot to love about these Honda models; the suspensions are great, the engines are extremely responsive, the racing DNA is strong, and the overall feel is top notch. But if there’s one thing that’s kept many from jumping into the Honda movement, it’s the fact that the vast majority of Hondas are front-wheel drive.


For some this isn’t a problem, and there are no shortage of engineers, builders and drivers out there who have proven that FWD Hondas can be brilliant machines. But that hasn’t stopped people from dreaming about what a RWD Civic or Integra might be like. And over the years a small number of crazed enthusiasts and backyard builders have actually tried to make it happen.


Aaron Weir is one of those people. He’s the man responsible for the radical, rear-drive Honda CR-X you see here – a car that he spent the better part of five years converting from FF to FR.


But the story of Aaron and his 1989 CR-X Si starts well before the radical conversion. It goes all the way back to the year 1996 when he purchased the CR-X as a 23rd birthday present to himself.


When he first bought the CR-X, Aaron didn’t know much about cars at all, but he soon began reading about modified Hondas in magazines and gathering with other CR-X owners around his home in Ontario, Canada. He also began auto-crossing at local events.


Naturally, Aaron began to modify the CR-X, first with the help of friends and family and eventually on his own. He started with the basic bolt-on upgrades, experimented with nitrous oxide, and then in 1999 swapped out his single overhead cam engine for a DOHC B17A motor. After that came a couple of custom turbo setups.


As his confidence working on the car grew, so too did Aaron’s skill as a tool and diemaker, and by 2001 he was a certified toolmaker with extensive knowledge in CNC equipment. In 2007 he opened up his own business called Weir Technologies where he did machining and fabrication for both industrial and enthusiast customers alike.


Having constantly evolved the CR-X in the 10+ years that he’d owned it, Aaron decided to put the car under the knife for a major rebuild in 2007. It wouldn’t just be an engine swap this time though – he wanted to convert the Honda to rear-wheel drive.

RWD Is The Way

Aaron admits he had “no idea” what he was doing when he first attempted the conversion. All he knew was that he wanted to do something different, and was eager to put his fabrication skills to the test. He also figured that building something ‘off the wall’ would be a good way to promote his business.


There are a few different routes one can go when attempting to convert a FWD Honda to RWD, but Aaron decided to base his conversion around the Honda S2000 and its longitudinally-mounted VTEC engine.


Getting the RWD-oriented F22C to fit inside the CR-X’s engine bay was not an easy task. In fact, the CR-X steering rack had to be dropped five and a half inches to clear the oil pan. In addition, the tie rod mounting points had to be lowered and the rods themselves use risers to stay near parallel with the front control arms.


The engine is mated to an AP1 6-speed manual transmission and power is then sent to an R200 viscous LSD differential inside a Nissan S14 rear subframe. Aaron has experimented a lot with the rear suspension in order to get correct geometry and this is the third variation of the setup.


With both packaging space and geometry to consider, Aaron built a custom pushrod cantilever rear suspension system that uses QA1 single adjustable coilovers.


Having had plenty of experience with turbocharging in the past, Aaron also wanted the RWD CR-X to feature forced induction. The current setup includes a Garrett GT35R turbo on a custom manifold, and at 9psi boost it’s good for 330hp and 230lb-ft to the rear wheels with stock engine internals.

Something Different

With the help of his father-in-law Frank and a few friends, the initial RWD conversion took Aaron five years to complete, with the car emerging from the shop in 2012. And he’s been constantly tinkering with it since.


In 2012, Aaron decided to close up his business and go back into toolmaking, but then in 2013 he got the chance to take a job with Vibrant Performance, a gig which he considers his dream job.


And when he’s not busy at work developing parts for Vibrant, Aaron has continued to upgrade the CR-X with a revised turbo setup, V-mount cooling and more.


Needless to say, there’s plenty more he’s planning to do, including a dry sump system, an upgraded transmission and additional aero improvements for the track. With two kids and a full time job, it’s simply a matter of finding the time to do it all. And speaking of his kids, he even made part of his roll bar removable so he can put the backseat in if they want to go for a ride.


Whenever he has the time, Aaron loves to get behind the wheel. Whether it’s to the track for an event or just out for a drive, as he tells me, “When the sun’s out, the CR-X is out”.


And with a car that’s so special it’s easy to see why he feels that way. Aaron no longer has to wonder what a RWD CR-X might be like, because he has one parked in his garage.

Here’s to another 20 years of fun with one of the world’s most unique Honda CR-Xs.

Mike Garrett
Instagram: japanifornia

Photos by Larry Chen
Instagram: larry_chen_foto

Aaron Weir’s 1989 Honda CR-X Si

2005 Honda S2000 AP2 F22C, removed factory water pump, tensioner & flipped alternator with Weirtech bracket/tensioner for lower placement, Weirtech tucked wire harness with Vibrant Performance split sleeve wire loom, Roro Designs powder-coated valve cover, ATI crank pulley, Vibrant Performance air filter, velocity stack, aluminum tubing to Vibrant HD clamps welded to turbo compressor inlet/outlets, Vibrant bar-and-plate intercooler core all fabricated by Weirtech, DH Racing 74mm billet aluminum throttle body, Weirtech intake manifold with billet velocity stacks inside 3.0-liter tapered plenum and 1 degree tapered runners, Weirtech fabricated turbo manifold made with Vibrant Performance flanges, Schedule 10 piping & collector, ARP exhaust manifold head studs, Garrett GT35R turbocharger with .82ar turbine housing, Precision 44mm wastegate, Vibrant GESI ultra high output catalytic converter, Vibrant Performance electro polished flexible bellows feeding 3.5-inch Vibrant oval tubing, assembled with Vibrant V-band assemblies, aluminum turn down tip, Weirtech trap door baffled 15L fuel tank, Bosch 044 inline fuel pump, Weirtech fuel rail, Injector Dynamics 1000cc injectors, AEM fuel pressure regulator, Vibrant Performance hoses & fittings, Meziere Enterprises WP136S 20GPM electric water pump, Speedfactory dual-pass dual-core radiator with dual fan shroud, Weirtech CNC billet aluminum thermostat housing, Vibrant Performance aluminum tubing hardlines, silicone couplers, t-bolt clamps & boost braces, Odyssey PC680 battery, AEM Infinity engine management system tuned by BR Tuning

Honda S2000 AP1 6-speed manual gearbox, Competition Clutch twin disc clutch, Hush22 hydraulic clutch conversion kit, custom prop shaft, Nissan S14 rear subframe assembly, R200 viscous LSD with 4.09 final drive ratio, rotors/spindles redrilled for 4×100 bolt pattern

Suspension & Brakes
Ground Control front coilover kit with single adjustable Koni yellows & Eibach springs, QA1 rear single adjustable coilovers mounted in Weirtech pushrod/cantilever cross member system, Bings adjustable camber/toe links, Energy Suspension polyurethane bushings, Accord Wagon front brake calipers with Prelude 11.1-inch rotors redrilled to 4×100, Nissan S14 rear discs redrilled to 4×100, Hawk brake pads

Wheels & Tires
949 Racing 6UL wheels 15×9-inch, Hankook RS3 tires 225/45R15, ARP extended lugs

Championship White paint, Anything Customs vinyl wrap, Fiber Images single-ply carbon fiber hood, Carbon Creations carbon fiber front fenders, C3 Custom Carbon Composites front splitter with Weirtech quick disconnect mounts, Kognition carbon fiber wing with 68-inch span, Weirtech CNC mount plates and uprights, shaved door handles, smoked corner lenses, bumper signals & headlights, OEM ’90-91 CRX taillights

S2000 AP1 gauge cluster, Vibrant Performance carbon fiber shift knob, Momo steering wheel & Lesmo One seat, Weirtech 6-point bolt-in roll bar, AEM UEGO digital wideband AFR gauge, Auto Meter shift light, fuel pressure, oil temp, oil pressure, coolant temp, fuel level, voltage gauges, Dynamat throughout the floorpan, custom floorpan upholstery, UKDM rear seat & belts, Weirtech CNC billet door handle covers, OEM digital clock

More Honda stories on Speedhunters

Cutting Room Floor


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Sweet oil catch can! Love it.


From the outside its got a total "boy racer" aesthetic, but beneath all's a technical triumph.


Really like Aaron's youtube channel! Nice to see the recognition behind your work.


Drift it?


vibrant should pay to ship this thing out to tsukuba circuit to see what it would run since tsukuba is the benchmark by which all cars are judged. I still don't know why an exact replica of the circuit hasn't been built in other parts of the world especially the U.S.????


@ihateyoutoo I LOVE that idea! An exact turn for turn, inch for inch, degree for degree replica of Tsukuba Circuit elsewhere in the world would be GENIUS!!!


Wait... so is the Strut Tower Brace the actual Oil Catch Canister? If so, that is just 110% divine elegance in its most efficient automotive application right there.


I kinda want to know how the undercarriage looks like , after the FR swap ... especially the front suspension .


This project car reminds me a bit of this, although it's more refined and set up for a different purpose altogether... Pretty similar cars in concept though.

I am in that camp too, so much cars I would really love....if they are rwd. this man is a dream builder!

Gianluca FairladyZ

Can someone help me to explain, what precise effect a Ati Super Damper has?


I'd say the next upgrade should be the roll cage


Audi has done it before


I am impressed that some one able to get paid $4180 

in 2 weeks on the internet .


eejjkk yes it is part of the crank case breather system, it is baffled inside at the filter end.  There is a small drain hole at the filter end should I ever need to drain it.  The 12an cap plug on the driver's side bottom near the strut tower will be the breather access from the dry sump oil tank that will sit on the frame rail next the the coolant expansion tank.


just as Elaine responded I didn't even know that some people able to make $9875 in 4 weeks on the ..........


How much has this conversion changed the center of gravity in terms of the vertical axises or would it be negligible?


THIS is the essence of SpeedHunting.


eejjkk Kind of difficult to replicate elevation and sea-level.


@Tim Gunn Easy work to remove the wing and splitter to turn it into a street sleeper.


my Aunty Audrey recently got an almost new cream Dodge Charger SRT8 Superbee only from working part-time off a pc.


What I`m genuinely interested is - did he had to do any cutting and welding to make the tunnel bigger for drive shaft or he had enough space already in the tunnel for exhaust ?
Suspension wise - of course. There`s no way fitting anything in without cutting. But making the tunnel bigger can make some headache..


@DriveCircles eejjkk Even track surface will radically change the times. Age, condition, material, ingredients etc will change how much it grips.


At Laguna Seca (Mazda raceway), I let a friend who hated Honda's drive mine on a trackday. He had to admit it was more fun than his corvette. It's not possible to race a CR-X without smiling. One of the most fun-to-drive cars ever made.


ChrisKutcher I doubt a whole pile of the original floorpan is left. They had to do a serious amount of fabricating to get it all to work. 
Reminds me of this


RahRooReeRah Yes this. And what about front/rear seeing as he didn't cut out the fire wall to mount the engine further back?  Probably not even noticeable, or at least compensated via suspension/alignment tweaks?  An inspiring car to say the least.


Gianluca FairladyZ 'Dampens' harmonic frequencies from the engine/crankshaft I think?  Which protects bearings... more of an issue with V and inline motors than boxers, not sure about any of this unfortunately.  
I would like to know why ATI seems more common than Fluidampr.


frankgile1996 Wow that's a whole new meaning to 'aggressive stance'


aaronweirtech eejjkk This is another reason why home built cars rule!  eejjkk you couldn't have said it better!


Some people make, some dream, do both you get this magical beast.


I've heard that Honda sold 4WD Civics. All of them were sold in northern Japan only because of the snow there. So it shouldn't be hard to convert them to FR. Drift teams always do this to EVOs and STIs, why not Civics or the FF Hondas?


My Uncle Julian recently got a 2013 Ford C-Max 

just by some part time working online with a cheap laptop.


ChrisKutcher most of the floor pan is there.  the tunnel is a 1" x.095" square tube skinned with 16ga sheet metal.  where the cross rails meet the tunnel, there is a 1" x 2" arch.  i did the tunnel in 2 steps to keep the floor pan from twisting- which would be more likely if removing the tunnel all at once.  the trans section was first, then the prop shaft section.


bluestreaksti RahRooReeRah i still have to corner weigh the car, but with the trans behind the firewall and the added weight of the rear end subframe assembly (over 200 lbs) the car is reasonably balanced through turns but very twitchy if you are not smooth with the throttle.


bluestreaksti Gianluca FairladyZ I really only have the ati pulley to mount an arbor i made to spin the oil pump for the dry sump system plan to re-install this winter.  my understanding is that the ati unit is lighter and a smaller diameter than the oem pulley.


just as Kim said I'm amazed that a person able to profit $5817 in 1 month on the computer .


If you are bored and want to listen to a quick interview with aaronweirtech from Gridlife go here...


I'm shocked that some people able to profit $5674 

in 2 weeks on the computer .


my mother inlaw got a stunning metallic Ford Taurus from only workin part-time on a home pc.


my father inlaw recently purchased Honda Pilot SUV 

by working part-time off of a pc...


aaronweirtech bluestreaksti Gianluca FairladyZ 
Lighter for less rotating mass, smaller for slower belt speeds and some of them are tuneable to the engine with different weights. Also better precision at high RPM's because the factory rubber damping is softer and less precise at high RPM.


so much awesome, and the icing on the cake, he's running a cat


my father  recently purchased Honda Pilot SUV 

by working part-time off of a pc...


Better off with a Legend.


I am taken by surprise that anybody can profit $8130 

in four weeks on the internet .