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Topics - twincharger

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General Discussion / JCCS 2016
« on: August 26, 2016, 08:59:11 AM »
Anybody going to JCCS this year?

I signed up to show the MR2 again.

General Discussion / RHD ae86
« on: April 20, 2016, 06:22:26 PM »
What do you think a Japanese import RHD AE86 is worth?

A friend of a co-worker has one in Mesa to sell.

I saw a couple of cellphone pics, its a white panda with maroon interior.

GTS, looks stock, looks nice.

I asked how much he wants for it.

The price was not astronomical...  Makes me want to buy it flip it.

General Discussion / R-152 A/C refrigerant conversion - Canned air
« on: March 27, 2016, 10:27:16 PM »

...So I had to replace the A/C compressor in my MR2 last summer.

The A/C worked in the car for a while, then quit.

No leaks, the system was fully pressurized with R134, the compressor clutch engaged, the compressor spun, but developed no pressure.

So I blew off a full charge of refrigerant because I, like most backyard mechanics don't have a refrigerant recovery system.

I replaced all the O-rings in the system, bought a new compressor and accumulator/drier.

I have a vacuum pump sourced from an old refrigerator and I borrowed a set of gauges from my brother.

I was looking for more refrigerant and ran across a post where someone used canned air in their car.

I did some research, found that canned air uses R152, looked up the temp/pressure chart and it looks good - quite similar to the R-12 that my car was designed for. 

I looked up the MSDS sheet and there are hazards, so don't drink it, don't inhale it and don't set it on fire.  How dangerous is it really when the proper use of the product is to spray it into the atmosphere onto live electronic devices?

With R152, the compressor pressure can be lower, less drag on the engine, less wear on the compressor, while giving colder air than R134.

The only drawback is that you must use ester oil instead of the PAG oil that is used with R134.

That wasn't a problem for me because my system was empty, so I pumped all the PAG oil out of my new compressor, and put the recommended quantity of ester oil in it.

I think I used one little bottle in the compressor and then one in the drier. I could be wrong, it was almost a year ago.

You can look up the oil quantity needed the same places that tell you how much refrigerant to use.

I blew out my lines with compressed air and installed the compressor and drier.

I evacuated the system and found no leaks, so I bought a can tap that punctures the side of a can instead of screwing onto the top.

The first can I tried to add did not go in so well.

When I punctured the can, it kind of dented it at the puncture site, so it was leaking pretty bad as I was filling.

The second can worked much better because I punctured it about 1/2 inch from the bottom of the can where there is more strength and it won't dent as easily.  The third can went in just fine.

So the low side temp is equivalent to about 30 degrees, and the high side is easily within the range that the compressor can handle, and lower than it would be with R134.

Here's an excerpt from,,

What should the high side pressure be?

With R12 systems, high side pressure is usually 1.8 to 2.1 times ambient temperature. That means on an 80 degree day, with moderate humidity, we would expect to see between 144 to 168 PSI on the high side. On hot humid days (with R12), you could say ambient temperature plus 100 PSI., and be pretty close.

With R134a it's common to see high side pressure between 2.2 and 2.5 times ambient temperature. On that same 80 degree day we would see between 176 and 200 PSI on the high side of an R134a system. The system operates in a specific range based on outside ambient temperature. High side pressure has a broad range relative to temperature because of heat load on the evaporator, humudity, airflow across the condenser, and engine speed.

So, the system pressures are normal, how well does it work?

Really well !!

So, I did this last year and then drove to JCCS in comfort, and it is still working fine this year with no trouble at all.

Here's a link with more info...

So...  If your A/C isn't working, you can use canned air as refrigerant.

Make sure you change the drier, pump the old oil out of your compressor and evacuate the system first.

This information is presented for educational and entertainment purposes only, use at your own risk. :)

Member's Rides / I bought another MR2
« on: October 18, 2015, 08:35:08 PM »
I was working in Tucson a couple of weeks ago, so I surfed Craigslist down there and got lucky...

I got an MR2,  blown 4ag bluetop and it came with a separate 4agze and 5-speed.


The interior was completely gutted, but the owner had almost all the pieces.

The MR2 was completely loaded with interior pieces, the trunk and the frunk were full of parts, The montero had a 4age, 4agze and transmission in it.

I had to go back to Tucson for another load of bumpers and the exhaust system.

It seems to be a Tucson car, no rust anywhere.  The paint polishes up really nice, but there are 2 pretty big dents in the car... and a smashed tail light.

It is coming together nicely, the plastic trim is nicer than my black MR2.

The fit of the front end is great, no uneven body gaps, the bumper, headlight and hood alignment is perfect.

Unfortunately I just noticed that the 4agze supercharger is locked up and does not spin, so that will need a rebuild.

The 4agze is US-spec, not JDM, I have the ECU and harness, but no intercooler.

I think the plaan is to try and get the supercharger working...

With or without the supercharger, put a GT3571 turbo on it, remove the 4agze intake manifold, lower the supercharger by a couple of inhes and install a Tvis manifold.  Run low boost - 14 psi on the 4agze computer and automatic transmission

General Discussion / JCCS 2015
« on: August 01, 2015, 04:23:39 PM »
JCCS - Japanese Classic Car Show 2015 !!!

Registration is open, show is Sept 19th in Long Beach, CA

So request off work, hire a babysitter, or whatever you have to do...

I requested friday off.... but didn't get it, so I will be heading out friday night.

I just registered the MR2, so as long as it is accepted and it makes it there under its own power, you will see it there.

If you plan to show, you might want to register soon.

My submission photos...

General Discussion / It's Christmas!
« on: December 24, 2014, 11:17:47 PM »
Hey everyone,  Have a great Christmas!

I hope everyone is happy and healthy and has time to spend with family.

And of course gets goodies from Santa for being good.

Twincharger - Chris.

General Discussion / Desert Datsuns Baghdad cruise.
« on: November 27, 2014, 01:21:58 PM »

The datsun guys are going on a road trip on a bunch of twisty roads from phx to Baghdad.

They are inviting all Japanese makes, sounds like they have some rx7s interested too.

The wife and I are gonna go in the mr2.

Anybody else want to go?

General Discussion / Happy belated 8-6 day !
« on: August 08, 2014, 11:12:52 AM »
Happy 8-6 day, uhhh last wednesday...

General Discussion / ...and we're back.
« on: January 20, 2014, 11:24:16 AM »
Good to see the site is back.

I thought I lost my build threads again.

General Discussion / Celica Tech day - continued
« on: November 26, 2013, 07:53:26 PM »
Ok, Tech and Turkey meet on friday, nov 29th 2013. - afternoon-ish.

That's the day after thanksgiving, most people are off work.

My wife is cooking a turkey friday, so there should be plenty of food.

The general idea is to put this engine...

Into this car...

I'm not thinking it will be too difficult, but there is a wiring issue with the relocated battery and the brakes need to be dealt with before it is driveable.

I've got tools and a driveway to work in, so if there is something you haven't got around to on your car, bring it over and have a mob of people tell you that you're doing it all wrong.

PM for address... in Glendale 51st ave and Peoria.

Chris (Twincharger)

Member's Rides / Going once, Going twice... SOLD !! Copart MR2
« on: October 29, 2013, 11:52:23 PM »
I bought a supercharged MR2 from  It's an automobile auction site.  They sell 500 cars in AZ every monday between noon and 1:30.

I bid and I won.  :)

It has some damage on the front.  The radiator still holds water and the front of the "frunk' is not bent, so basically the bumper brackets took the damage.  The alignment is fine, and since the engine is in the back, it's fine.

I went to see the car in person before the auction and noticed all kinds of upgrades...  Eibach springs, Adjustable dampers, Konig wheels, upgraded stereo and seats.  The suspension did not show up in the pictures, and was not in the description of the car, so I think I was the only bidder who knew what was in the car.  :)

I'm not sure if I was allowed to, but since the keys were in the car, I turned the key and it started right up.  Good oil pressure, alternator worked, ran smooth.  That took a lot of the guesswork out of the bidding.

The tires have plenty of tread, and all held air.

There's a supercharger in there...

The T-tops are in great shape, and the covers are behind the seat.

Aftermarket seats, I hope I like them, because they are welded in !

I brought it home on a trailer, but after removing the hood, I could have used a 3-day registration and driven it home.  I zipped around the  neighborhood a bit and everything works, brakes are ok, clutch is good.  It feels like a 15-second car. The twincharged corolla would definitely eat it for lunch.  It makes it feel like the high RPM range is weak in the MR2 in comparison.  So, I may twincharge this.  I have almost all the parts already.

Low mileage!!!  maybe...  The speedo does not work.

4AGZE, totally stock.  US Spec... Lower compression and no oil squirters.  It has not even had the ABV mod done.  Even though the vacuum lines have been replaced.  If you put the hose onto the 'wrong' side of the blowoff valve, boost holds the blowoff valve closed and gives you a few psi more boost.

The previous owner shortened the shifter by cutting the threads off the shift lever.  Now the shift knob spins.

I need to install one of my trademark Hurst T-handle shifters.

After washing to see what I have here...  This thing is clean. No scratches, dents or door dings.  This was somebody's garage-kept baby.

Dual exhaust... Well, a dual outlet muffler at least.  The inlet is a mixture of tin cans and bailing wire, which means it sounds just awesome!

But the front end... uhhh.  After taking the bumper off and seeing the extent of the damage..  I just have to straighten the bumper brackets which are kind of extensions of the framerails.  I bought a nice big piece of steel to use as a pry bar and straightened them right out. Then bolted on a less-bent bumper.

I got a hood, headlights and some front end parts from Errin.  Thanks again!

I saved the driver side fender, the air dam and even the bumper cover.  The bumper cover has a couple of rips and the paint is cracked from stress, but I'll use it until I find another one.

I still need a passenger side fender, and I found an amplifier under the passenger seat.

It is going to stay there because the seats are welded in place.  There are speaker wires behind the seats, but unless the previous owner was really short, there is no room for speakers there.

General Discussion / Racing isn't dead.
« on: June 12, 2013, 05:04:59 PM »

Racing isn’t dead!
June 11, 2013 in 2013-6, Announcements, Articles

Former Firebird international Raceway is now Wild Horse Pass Motor Sports Park
By Nicole James
Breaking News!
After nearly 30 years of service to the valley, both Speedworld Dragstrip and Firebird International Raceway closed their gates earlier this year. Speedworld closed due to politics between its owner Dan Matthews and the State. On the other side of the Valley, the seemingly more crushing blow to Arizona car enthusiasts came when, Charlie Allen was unable to renegotiate a lease with the Gila River Indian Community to secure the future of Firebird International Raceway. After 30 years of serving both local and national motorsports enthusiasts, Firebird held its final event on May 30, where the crowd was entertained with monster trucks, funny cars, jet dragsters and even Robosorouse made an appearance.
Running and maintaining a raceway is no easy task. The Gila River Indian Community did not want to completely close the place so many people love. They intend to run the former Firebird Property as a motorsports complex. The Gila River Indian Community hired former Daytona Motor Speedway VP Dick Hahne to be the executive overseeing the operation, and later brought on Bill Schneider into a management position. Hahne comes from a long history of circle track experience, and Schneider has owned and operated drag strips in the Midwest. Together, the dynamic pair is a seemingly winning combination for this beloved raceway.
A Facebook page was launched this morning announcing the property on the Gila River reservation will be called the “Wild Horse Pass Motorsports Park.” You can check out their Facebook page here.
After some remodeling and repairs over the summer, Wild Horse Pass Motorsports Park will hold an opening event on the weekend of October 12, 2013. The Lucas Oil Drag Boat Series has already announced that they are moving their September event from San Diego to the Wild Horse Pass Motorsports Park. The event is scheduled to run September 13 – 15, 2013.
Check back with Car Street Journal for all the latest Information!

Member's Rides / Build thread 1JZ-AE86
« on: May 02, 2013, 04:36:34 PM »
I have been too lazy to re-create my build thread from the old board, so I'll do it here...   eventually.

For now, I'll share this...

No, you're not seeing double.

The pictures are from yesterday.. and now the exhaust is almost done.

I just have to put in some muffler hangers before connecting the downpipes to the turbos.

Everything is just tack-welded in place, I think I need to rotate the rear turbo a little bit, but there is room for everything.

I have two 3-inch exhausts, the hood closes, no problem.

It's a GT40 that will be feeding a GT37.

The big turbo will be pushing air into the little one.

The big turbo will have its output turned around to point to the smaller turbo.

The combination should spool like stock and have as much top end airflow as the GT40 can put out.

In this case the big turbo will limit me to 550 hp.  It may need an upgrade to get me into the 10's.

That's all for now.

Technical / Supra rear end install
« on: March 05, 2013, 01:15:32 PM »
Supra rear end installation notes...

If you follow David's instructions, you are left with a rear-endless car.

The next logical step is to install a Supra rearend.

It's not quite a bolt-in, but not too bad.

This is a Supra rearend in my AE86.

The Supra rearend is an inch or two wider than the corolla's rearend.

Depending on your wheel and tire combo, that might matter to you.

Notice in the pic, that the stock corolla's panhard bar is a couple inches too short.

I looked around, but never found a panhard bar from another car that would fit, so I made a custom one.

Another thing you may notice as you install the rearend is that the spring perches on the Supra rearend are for springs that have a diameter that is about 1/2 inch narrower than the corolla springs.  The supra's springs taper from top to bottom by 1/2 inch.  That makes the corolla springs look like they will fall off the spring perches.  Shortly after installing the rearend, I found some supra springs, so I used those.  The spring perches are spaced a little wider on the axle than they are on the car, so the springs end up tilted a little.  My car is not lowered, so it works fine for me, but the shorter your spring gets, the more it may make a difference for you.

The Corolla swaybar works, but the supra swaybar is thicker.  They are the same shape, but the mounting brackets are a little different.  I remember I ended up modifying the corolla brackets while they were on the car with a hammer, now they fit just fine.

Another thing you will notice when you install the control arms is that the control arm bolts for the supra are bigger than the corolla's.

If you use all corolla bolts, your rearend could twist as the small bolts move around in the larger holes.  That would be noisy, and misalignment could set up driveshaft vibrations.

In this pic, look at the bolt widths.  The smaller bolt goes into the car, while the bigger bolt goes into the rearend.

I removed the metal sleeves from both the supra control arm and the corolla arm with a torch, then inserted the larger sleeve into the left side of this corolla arm

If you use corolla arms, your wheel ends up off-center in the wheelwell.  It's an inch or so back from center.  That's a 225/50/15 in the pic, so you can really see how far off-center it is.

In order to put the 26 inch tall drag slicks on, I had to perfectly center the axle in the wheel well.  I made custom control arms... Rubber bushings on one end and heim joints on the other.  (same car - fresh paint)

The car had a Celica engine in it at this time, I had to mix-n-match celica driveshaft halves to come up with a combination that worked.

If you leave the axle toward the rear of the car, there's a pretty good chance that a stock corolla driveshaft would be the correct length.

So. as far as the rearend swap goes... 

You could use the stock corolla control arms, maybe stock driveshaft, corolla springs and swaybar, but you still need a custom panhard bar.


You SHOULD use adjustable control arms.  You could match the size of the bolt holes with the hardware used for the control arm ends, you could center the rearend in the wheelwell, and adjust the pinion angle for no driveshaft vibration and long u-joint life. 
You SHOULD use a tapered spring, or modify the supra's spring perches for a wider spring. 
You WILL need a custom panhard bar, and maybe a driveshaft.

As far as rearend swaps, that's pretty easy.  No welding, no shortening, lots of gear ratios to choose from, and the LSD unit from a MkII supra (very common) drops right in, and if you're lucky, you can find one with disk brakes.

General Discussion / 1JZ corolla at Speedworld
« on: October 07, 2012, 01:57:09 AM »
I took the 1JZ corolla to speed world saturday night.

It ran way faster than it ever did...  then it broke.

I was on street tires because the last couple of times I took the car out, it did not go near fast enough to need the race tires.

My LSD rearend is weak... It won't spin both tires... even old street tires, so I could spin one tire 3/4 the way down the track.

On one run, I got decent traction and ran 14.04 at 103 mph.

Then a few runs later, something let go... coolant all over the place, steam in the car, instantly fogged up the windshield at almost 100 mph.

There's coolant on the headlights, inside the car, everywhere.  Can't tell where its coming from right now.

Since it hasn't run a 13 yet, I can still take passengers and don't need a helmet.

That probably won't last, as soon as I rebuild the LSD, the better traction and race tires should put me well into the 13's.

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