Hey my question is how big of turbo's can I put on a MKIII with a 1J? I am not trying to put huge twins on there just something a little bit bigger than stock. Any ideas?
Upgrading 1JZ Twins
- Thread starter Mk3AE862.0XXS13
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How big are your supporting mods?
How much money do you want to spend?
Why do you want twins?
You can run 2jz twins but you have to bang the firewall and drill out a couple exhaust manifold holes.
A single is far more more efficient and cheaper if your using tubular manifolds.
If you want to start running tubular manifolds then you need twin manifolds twin down pipes tiwn intakes twin oil hoses...
How much money do you want to spend?
Why do you want twins?
You can run 2jz twins but you have to bang the firewall and drill out a couple exhaust manifold holes.
A single is far more more efficient and cheaper if your using tubular manifolds.
If you want to start running tubular manifolds then you need twin manifolds twin down pipes tiwn intakes twin oil hoses...
Supporting mods consist of a GIANT intercooler, stock motor, stock manifolds, stock everything other than radiator(its mishimoto) and I want twins for the fact of having twins, going single would be the cheapest, easiest, most reliable and most unlimited option but I like having twins, even if I have to keep the stock ones...I would like to avoid banging in the firewall. So tubular manifold would be the best option to avoid modifiying the body and chassis, but I would have to run twin everything else...would I have to run two intercoolers or is the gianormous single sufficent...the stock twins are running 1.0 Bar of boost btw. Not looking to make a super powerhouse or run 10's or even 11's. I'm looking to do something different and be relatively fast. If I have to keep stock twins I will but I WILL keep twins.
Supporting mods as in fuel and tuning.
You run 1 intercooler and just y pipe them into 1.
Tubular manifold with something like twin t28 ball bearings would be a good option and make good power. Could even do twin 57trim ct 26's twin stock ct26. twin t25.
iirc someone around here will upgrade the stock twins but its worthless unless the ceramic parts are replaced with steel ones. Its also like 1200+ to do that.
You run 1 intercooler and just y pipe them into 1.
Tubular manifold with something like twin t28 ball bearings would be a good option and make good power. Could even do twin 57trim ct 26's twin stock ct26. twin t25.
iirc someone around here will upgrade the stock twins but its worthless unless the ceramic parts are replaced with steel ones. Its also like 1200+ to do that.
Stock ECU, no idea's on that yet prefer to get the stock ECU reflashed, don't like piggy backs, and dont feel like investing in a standalone. As for injectors I would probably get some around the area of 650-770's. And how about heat? I noticed that the supra runs warm with stock turbos and 1 fan, 2 fans it runs a little warmer but if I am worried if I go with two T3/t4 50 trim I will blow a head gasket. Also how much boost can you run on stock 1jz internals? I don't plan on running more than 25psi total.
Can get everything heat coated or wrap everything to keep the temps down.
Id run a clutch type fan as they cool much better in 9/10 cases.
Cant reflash a toyota ecu. piggy back or standalone are your only choices.
Stock has a mhg. It will be fine so long as your tune is good,.
How much boost you can run is dependent on what fuel and how much tuning you have,.
water meth would be a good idea but its better to have a standalone so you can add more timing and make more power.
Id run a clutch type fan as they cool much better in 9/10 cases.
Cant reflash a toyota ecu. piggy back or standalone are your only choices.
Stock has a mhg. It will be fine so long as your tune is good,.
How much boost you can run is dependent on what fuel and how much tuning you have,.
water meth would be a good idea but its better to have a standalone so you can add more timing and make more power.
Also what would be a good size cam for moderate upgrade, would a 256 be more than enough or is a 264 streetable? And I was more concerned with how much power/boost the stock 1J internals can handle? Are they forged? I know the headgasket is a steel one. Do I need to upgrade the cams to go run more boost?
Dont need to upgrade cams to run more. Will make more power with cams if there tuned correctly. 264 would be better.
crank and rods are forged. There is no set number as to what they can hold. It all depends on your tune.
crank and rods are forged. There is no set number as to what they can hold. It all depends on your tune.
two GT28Rs is about as good as it gets IMO
without standalone, you're looking at ~550cc max injector size, and a piggy back is still needed in order to control that (S/N-AFC). after that, do some 264s, and that's a good street build that should make good power.
lastly, all that heat is BECAUSE of the twins.. there's a ton of heat in a cramped compartment, ipso facto, hotter temperatures for everything. getting more air flowing, tubular manifolds, and water cooled turbos help with this, yet in the end this another reason why a single turbo once again is the main choice for the majority on these forums (cheaper and easier to work on too). But you said it's staying twins, so that's that.
without standalone, you're looking at ~550cc max injector size, and a piggy back is still needed in order to control that (S/N-AFC). after that, do some 264s, and that's a good street build that should make good power.
lastly, all that heat is BECAUSE of the twins.. there's a ton of heat in a cramped compartment, ipso facto, hotter temperatures for everything. getting more air flowing, tubular manifolds, and water cooled turbos help with this, yet in the end this another reason why a single turbo once again is the main choice for the majority on these forums (cheaper and easier to work on too). But you said it's staying twins, so that's that.
I have BC264 cams, perfectly streetable. As for sticking with twins, I love the response from them, but piping is a nightmare. All that said, IF you can find (or design) something like the old school K26 turbo setup from Blitz, you'll have a quick spooling monster on your hands. 
I too was adamant on staying twins however the heat is just crazy and the removing and installing of twins is a nightmare. There are several places that can rebuild them, however like someone mentioned, the weak point is the ceramic blades that doesn't really get changed (that would run about $800 shipped for rebuilt twins) but with steel wheels you are looking at around the other figure of $1200. Hence, why i have decided to go single.. lol
makes life so much easier..
makes life so much easier..
