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Just got my car back from my 94T to gen3 swap. I cannot tell you how much better this engine is than the gen2 stock for stock. I don't want to get the age-old "gen2 or gen3, which do I get?" debate fired up again, but I am very pleased with the new engine. My gen2 was a very healthy 100,000 mile stock motor. If you were to ride in them back to back you wouldn't even think they are the same type of engine! The low end torque of the gen3 is astounding!! It actually feels more like a v6 in that department. Also, sound is amazing! I am dead serious when I say that the gen3 sounds better than the gen2. I'm not talking about exhaust because I'm still on the stocker, I'm talking about the roar of the engine. I swear the thing sounds exotic. It definately sounds more...."mean" than the gen2 does. More... higher pitched in an exotic, Italian sort of way. I will type more later as I have spent more time with it and have more time to write, but I just couldn't help myself because I'm so happy! On a sadder note, I'm having a little trouble with certain things like my speedometer, which I have posted about in the JDM section and am offering money for whoever can fix it. If you have the means and you have a competent installer near, the gen3 is an excellent choice! More later tonight...
 

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After driving my car for more than an hour straight, I am inclined to say that I love this swap more than last night. I'm not sure if it's one thing, most likely a combination (better intake manifold, no 2nd cat, etc.), but I simply cannot believe the amount of low-end torque this thing has! It seemed that on my gen2 with mbc that the engine was a slouch below 2500 rpm when the turbo kicked in. There is no waiting on this engine; the second you press the pedal you surge forward. I would like to see a stock for stock gen2 and gen3 dyno plots overlayed so I could see how much sooner the torque kicks in with the 3rd. It is awesome even on 7 psi! It doesn't have the rush of my previous engine yet, but that's because I'm only running 7 psi due to my mbc not being installed. I also feel it's fair to mention that also with my gen3 swap I installed a Tanabe b-pipe and a SPEC stage 2. Both of those are also playing a part in the overall feel of the car. The SPEC is such an excellent clutch and will get my recommendation any day. So much smoother and softer than my previous Clutchmasters Stage 1. The Tanabe is sweet! The sound, even on stock muffler, is amazing! I always thought the stock muffler sounded good, but this is definately a little louder and deeper. It has a new 2,000-3,000 rpm growl that I kept wanting to hear. One of the most awesome things so far is the backfiring. I didn't think there would be any due to the primary cat still being intact. Well, there is! If I rev it up to 5,000 rpm, clutch in, BRRRRAAAPPPPPPP POP! I love that sound of unburnt fuel being ignited in the exhaust. Another great thing that bears mentioning about 3rd gen swaps is that you get a whole new transmission as well. My older 80k mile '94 lsd tranny was doing fine, but it was definately worn out a little. The new one shifts extremely well, and after some Synchromesh it should be in tip-top shape!

Downsides:
1. Installation - The wiring sucks unless you take it to an MR2 specialist, such as the Hux's down in Florida, Josh Boam in Cali, MR2 Warehouse up in PA, etc. If you don't have faith in your mechanic, don't let him do this swap. My mechanic is awesome and has been doing our family's cars for decades. He is extremely good and will stand behind his work. Even without any MR2 experience, the mechanical part went off without a hitch. The wiring is the only problem we're facing. My point is, any competent mechanic will be able to do this install, but wiring diagrams will definately be handy if you use a non-mr2 guy.

2. Parts - Parts availibility is Ok. Jay Marks Toyota in Texas stocks timing belts, water pumps, plug wires, etc. Half the parts are even interchangable with the gen2, so they're not hard to get ahold of either. Also, Jay Marks can get ANY part as they have the Japanese parts list for the 3rd gen mr2's. The only problem with parts is that if it's not in stock, it's a month or so wait while it's shipped from Japan. Also, aftermarket parts are not readily available for the gen3 over here.

Those are the only two things I can think of. Besides slight wiring difficulties, I am ecstatic about this. Best of all, you can get all this while giving your car a new lease on life in my opinion. This engine and transmission has 80,000 less miles than my previous one. So, not only has it been used less, but now for most of its life it will be in my care. This means Mobil 1 synthetic, warmed up before boosting, cooled down after driving, colder spark plugs, etc. Not only does it have many less miles, but it will be in better shape than mine when it gets there!
 

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Will, I have been trying to tell people this and nobody listens. The Gen3 rules all, it is an amazing motor. Im glad you love it.

Do you have a boost gauge? You say you are running 7psi, yet the stock setting on the Gen3 with a ct20b is 13psi. Is there a swapped out actuator? TVSV holding it back?
 

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Discussion Starter #4
Yea, boost gauge says 7 psi. I'm not sure what's holding it back. I'm guessing that it could be the speedo isn't working due to a some wrong wiring. I read on the U.K. FAQ that one reason full boost isn't being reached is because certain sensors aren't recognized. I'm hoping that's the case for mine and the speedo. fter I get the speedo working, everything should be awesome!
 

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My friend had that same problem with his Gen3. It ended up being a ground wire wasnt ground properly, and after he sorted it out, he got normal boost and out of low boost mode. Good luck.
 

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SWAPPING MR2 3RD GEN 3SGTE WITH A CUT HARNESS

Does anyone at all know how to connect a JDM 3rd Gen 3SGTE with a cut harness into a USDM 93T (any wiring matching clues)?

A mechanic that was going to do the swap said he would not touch this swap due to the cut harness.

Thanks for any help,

Earl
 

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Stop making me jealous! I'm still waiting for mine to arrive. Dave Jenny over at the MR2 Warehouse is taking care of my baby waiting for its 3rd gen as we speak...I was just looking at my friends deuce today since he's doing the timing belt and I'm not sure how much longer I can hold out, lol.
 

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It is well worth the wait. Welcome to the club!
 
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93smgturbo said:
Will, I have been trying to tell people this and nobody listens.
Actually I have a GEN II and would love to have a gen III, but not everybody has a fortune laying around the house for a motor swap, and the rarity of the motor contributes to it not being used in all aplications. According to the power primer a 300whp gen ii is not all that different from a 300 whp gen iii, and you can build up a gen ii to make just as much power as a gen iii, its just the gen iii starts with some better stuff. I know injectors and ct20b and a different ecu, nething else gen iii owners?

What are the better features of the gen iii over the gen ii?
 

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A 300whp GenII and GenIII would be far from the same. A GenIII can still be on stock fuel, ECU, etc... The GenII at that point would need new injectors and then something to control them. A VPC, or SAFC w/ an FPR, or an EMS. Correct that both motors have just as much potential, but under 330rwhp, the GenIII shines over the GenII. The Gen3 has bigger injectors, NO AFM, bigger throttle body, better intake manifold, higher lift intake cam, metal headgasket, lower compression ratio(8.5:1), the rings are made of stainless steel, better turbo, etc... I dont say that nobody listens because not many people have them. I say that nobody listens because everybody says "oh, they're not that much better". IMO, for the extra $1500 for the GenIII, it is definitely worth the money, unless you plan to go 350rwhp+.
 

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I love reading how much people like the Gen 3, cause thats what i will have in a month! Yay!
 
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Now your making me really want a 3rd gen, but I should probably get my 20g first. Well the ats externally wastegated turbo is 2000 dollars, plus I would need 800+ for the intercooler and spal fans, and another 400 dollars or so for an safcii and fpr, which comes out to a little over 3200 dollars plus some money for dyno time and if I can install all that stuff myself.. Would my car be faster if I just went with a 3rd gen and tuned it a little? Where can I get a 3rd gen for 1500 dollars?

Im selling a miata soon, and would like to make the MR2 alot faster than it is with that money. But if a third gen can create more power with a stock ct20b and all that extra injectors and stuff I may rather go with it.

Whats the fuel mileage for a 2nd gen and a 3rd gen? since this would be my daily driver.
 

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sirscrtm said:
Now your making me really want a 3rd gen, but I should probably get my 20g first. Well the ats externally wastegated turbo is 2000 dollars, plus I would need 800+ for the intercooler and spal fans, and another 400 dollars or so for an safcii and fpr, which comes out to a little over 3200 dollars plus some money for dyno time and if I can install all that stuff myself.. Would my car be faster if I just went with a 3rd gen and tuned it a little? Where can I get a 3rd gen for 1500 dollars?

Im selling a miata soon, and would like to make the MR2 alot faster than it is with that money. But if a third gen can create more power with a stock ct20b and all that extra injectors and stuff I may rather go with it.

Whats the fuel mileage for a 2nd gen and a 3rd gen? since this would be my daily driver.
Sorry for the confusion. I meant for the EXTRA $1500 it would cost for a 3rd Gen. over the price of a 2nd Gen. For example, $2500 for a clip for a 2nd Gen., and $4000 for a 3rd Gen.

Ive had two previous MR2's that were 2nd Gens and my 3rd Gen gets basically the same gas mileage. About 20-23mpg, and 26-30mpg on the highway. Because the ECU does a better job at controlling fuel and not running so rich, the 550's are able to get as good of mileage as the 440's.
 
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WHy does it always have to be in clip form? Once I pull the motor out, am I supose to just let this hunk of an mr2 sit in my yard all day? Is there anywhere, where you can just buy the motor, and possibly the transmission as well, and have it shipped in the mail? It would be alot easier than having to tow half a car to my house. Or is a clip cheaper?

Where do I get 3rd gens and there transmissions?

Whats faster a stock 3rd gen with minor modification, or a 2nd gen with a 20g and supporting mods on stock fuel system?

How does a 3rd gen do when it comes to emissions?
 

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The reason people do clips is because it makes everything easier. You need more than just the engine and tranny. You need the map sensor, ECU, wiring harness, etc... So you can peice everything together or buy a clip and be done with it.

Most people get their stuff from Jarco, or Motors Unlimited to name a few.

Well the 20g will only be able to get you 275rwhp on the stock fuel system and you can do that with bolt ons with the Gen3 too. At 275, the ct20b has just about had it though but you can get just as much power out of a BPU Gen3 as you can with a stock fuel system Gen2.

If you live in California, you would be licking your sac for emissions. The only thing different is the lack of EGR, which most places wont even look for. With a primary cat and aftermarket exhaust, I passed just fine.
 

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jdmmr2gen3 said:
and if i am not mistaken all gen 3s come with lsd not all gen 2s do ( i could be wrong ) but i am pretty sure i am right
LSD was not an option until 1993, and was on 80% of them after 93+.
 
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