AW11 Supercharging for Rallycross? On a budget...

I have my Rallycross '87 MR2 that I've been thinking about adding boost to.  I was going to go turbo and I have hanging around a couple used turbos of appropriate size that I can fab something together.   I started thinking about packaging of the unit and one thing that keeps coming to mind is the space under the intake manifold from the removed A/C Compressor.   

So I have a fairly large area made clear by the removal of a pump designed to be run off the crank pully.  Seems kind of nice to fill that up with a supercharger.   So I need boost levels to be low as I'm not building the bottom end.  I figure 5-6psi.   Any recommendations on what to look for as far as an extremely budget friendly start?  Junkyard boost would be nice for it cheapness but I've also been thinking about a used Miata supercharging kit since the engine displacement and desired boost levels are about the same.   

Any thoughts?  I like the idea in Rallycross of the instant response and I'm not looking to ever really surpass 200ish HP.   If I pick up a used Miata kit I expect the compressor to be near toast how hard and how expensive is a rebuild for it?

The aw11 came supercharged from the factory. Look for the factory supercharger on eBay. Then look into grafting it to the 4age. Head over to club4ag.com. Crap loads of info over there. 

Seriously, you’d be ahead buying this though: https://www.ebay.com/p/JDM-TOYOTA-4AGZE-Supercharged-Engine-5-Speed-Transmission-Mr2-Corolla-With-ECU/657242620?iid=163025675702&ul_ref=https%253A%252F%252Frover.ebay.com%252Frover%252F1%252F711-117182-37290-0%252F2%253Fmpre%253Dhttps%25253A%25252F%25252Fwww.ebay.com%25252Fp%25252FJDM-TOYOTA-4AGZE-Supercharged-Engine-5-Speed-Transmission-Mr2-Corolla-ECU%25252F657242620%25253Fiid%25253D163025675702%252526chn%25253Dps%2526itemid%253D163025675702%2526targetid%253D405043611764%2526device%253Dm%2526adtype%253Dpla%2526googleloc%253D9033178%2526poi%253D%2526campaignid%253D962146729%2526adgroupid%253D46733577494%2526rlsatarget%253Dpla-405043611764%2526abcId%253D1129816%2526merchantid%253D113756972%2526gclid%253DEAIaIQobChMI34CgnbyO2wIVS1uGCh1V3AXUEAQYAyABEgLMH_D_BwE%2526srcrot%253D711-117182-37290-0%2526rvr_id%253D1534757035394%2526rvr_ts%253D719b00a71630a86186867611ffeb6bad&chn=ps

You’ll have all the peripherals, the Ecu, the supercharger, and a spare engine. Plus, a transmission you could use or sell. (Likely a c50/2/3)

Swapping in the stuff from the GZE is probably the easy way to go. Im running one in my ae86 autocross car and with a bigger crank pulley and intercooler im around ~165whp

I sold my MR2 SC back in 2004. Even at that time, 14 years ago, it was hard to find SC axle half shafts. 

The SC came with a stronger cv/axle to accommodate the additional power. These shafts were the desire of anyone who turbocharged or upgraded the power of their NA MR2. 

I would try to source these axles first. 

I also had a 4AGZE swapped MR2 that I sold back in 2012.  The JDM swap is the easy button for more power, and I opted to keep the stock NA C52 due to axle availability.  I autocrossed it for a few years on R comps and never broke an axle, but did break plenty of other stuff.

If you go ahead with the C52, be sure to strengthen the front center motor mount.  I also kept eating aheel bearings.  I kinda miss the blower whine.

John Welsh said:

I sold my MR2 SC back in 2004. Even at that time, 14 years ago, it was hard to find SC axle half shafts. 

The SC came with a stronger cv/axle to accommodate the additional power. These shafts were the desire of anyone who turbocharged or upgraded the power of their NA MR2. 

I would try to source these axles first. 

I'd do a V6 or even a 2.2 5SFE swap for down low torque and less mechanical complexity.   You can mate SW20 MR2 half shafts to 88-91 Camry V6 5spd outer CV joints, which will fit the NA Mk1 MR2 hub splines.  (Camry V6 axle is in stock right now for a whopping $30 at Rockauto.)  This assumes you are using an E153 transmission.  

I know this because, yes --  4AGZE axles are nigh unobtanium.  And if you do find them, you'll need the SC hubs/uprights to go along with them.

4AGZE I built for a client last year...... no budget concerns.......

In reply to oldeskewltoy :

Is that on the sc12?

Fitzauto said:

In reply to oldeskewltoy :

Is that on the sc12?

yes....  that was the one parameter I built this around.  Client wanted 200whp from SC12 4AGZE

Over 200HP out of a 4A? Holy crap OST, you've got SKILLS... and a fat wallet to help ! Hope the owner's happy.

Maniac,

Hey, I own an AW11 too and I have a little advice from posting on mr2.com. IF you're dead-set on the supercharger you will likely need to go for a newer mercedes unit instead of the SC12, as the fandom around the GZE still doesn't have any good way of fixing or rebuilding the roots-style SC12, and the company (Ogura) has rebuffed several who have asked for kits. IF you want to try to do something on the cheap, go for a different supercharger manufacturer, snag a GZE ECU, and message Yoshimitsuspeed at Matrix Garage for more advice. You'll likely need an AFM, bigger injectors, MAYBE a cooler spark plug, and intercooler...

Wait,  your ac compressor was under the intake?  If there’s a way to mount something else crank driven under the intake im all ears.  I could fit a scavenger pump then.