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Sigma Vs 6G74

25K views 57 replies 16 participants last post by  Rushking19  
I recently acquired a supercharged v6 tiburon with a blown motor. I have a stock on the stand right now that im gapping the pison rings. Also putting in a haltech sprint 500 to tune it. I plan on blowing this motor up this summer pushing as hard as i can. But im gonna build a 3.5 sigma with the mitsubishi internals and get it to 4.2 so when i blow it up its ready for the upgrade. Hopefully the 4.2 will be ready this summer for the races.
that's a 10 thousand dollar choice to blow and engine and then build another... If you are going to build a 3.5, start now... If you have 1 car to drive, build 1 engine. if i were you, i would be building that super charger kit around the sigma.
 
side note, i have a 3.5l and a 5 speed awd trans coming in soon. Hunting down the rest of the parts i need for an attempt an an awd conversion. cross member carrier, transfer case, rear differential, front/ rear axles, drive shaft bearings/ bracket all ordered, hunting down a few more parts, like a drive shaft. (but im holding off on ordering that jus yet, because i may need a custom one made. (im hoping the stock santa fe will fit) I'll try and post pics in the coming days, been a while since i had anythign worth posting.
 
I already have tiburon that has the 2.7 in it. And has the ripp kit installed and running now. It has the safc2. I have decided to put a 6g75 3.8 on it this winter. I can get 300hp and lots more torque n/a out of it. With my supercharger and the haltech controlling it with e85. Im hoping to push 450hp to the wheels
post some pics of the ripp install. I'm curious to see how you went about it.
 
I will. My biggest concern is i have an auto tranny. Trying to control the tranny with a standalone and having mitsibushi motor especially if i go to awd. Thats gonna be a headache. Im gonna try to make it to the dyno this week. Will post up my results. Im guessing 300 ish on 12psi
there are all sorts of race/ performance transmission shops hat can offer you built/ upgraded transmissions, even if you convert to a manual, witht the amount of power you want to put down, you will need to look into getting built trans/ custom built axles.
 
OK, so to keep on topic, and for those of you who are curious.... The reading I have been doing, suggests that the first generation KIA Sorento 3.5l engines are sigmas... they have a completely different intake manifold system. BUT the KIA Sorento came with a manual 5 speed, and an automatic... so there is a possibility to swap in a 3.5l AND get the manual transmission that you would like. They came in RWD and AWD options. The firewall is not your friend here. There is a possibility of having to move the firewall, or at least not certain areas. But in my opinion, if you are swapping in a custom engine set up, you should be relocating your firewall anyway. Make sure you have enough room in the bay so you can work in there. Otherwise you're gonna have to drop the subframe everytime.
 
the early kia 3.5l engines are sigmas, mid 2000's they changed. The Amanti, Sedona, xg350, Santa Fe 3.5 all have the same engines, (there are other models also). The BIG reason why I'm interested in doing this swap, is the potential... not the immediate horsepower upgrade (only a few). The potential the 3.5 has is huge. It has stock 10:1 compression, which is awesome for a stock factory engine (plan on building a forced induction kit) plus an iron block. The drivetrain and electrical are going to have to go hand in hand, or completely go custom electrical. Might as well try plopping on of these in the rear. Home made hyundai supercar killer, lol yeah right, but it would be a fun build.
 
front engine awd/ rwd swap, or a mid engine conversion.. either one is a process, and has its own hurdles. Which to build is up to what the goals of your car are. ANYTHING is possible, jus need time, and some cash, and the desire to learn how to do it yourself. If a 3.5 sigma can fit in a gk tib engine bay (with minimal modification) ((im also assuming the trans is in these builds from Korea)) there is no way it shouldn't fit with a custom cleaned up engine bay set up. Remove all the nonesense, and you can get it in the front. Roll cage, and rebrace the frame, and you'll be able to cut out the rear, to potentially build the frame work for the rear subframe/ mounting area. The car MUST be reinforced before you start hacking it apart, you don't want it to warp/ twist on you while workig.

Lots of people ask why not put in a newer engine (mid/ late 2000s and up) in, instead of the older sigmas... my reasoning, the amount of "computers and extra wiring, and ******** valve timing, and other garbage is completely useless for me, so i dont need any of that stuff. Plus the older engine are more affordable currently.

The talk of mitsu parts fitting in our engines... the early sonata 2.5s will fit some mitsu stuff, and some intake parts for the 3.5l, other than that. Not much is actually compatible without modification/ major understanding of swapping parts. why? because the EARLY hyundai engines were apparently designed, and manufactured by mitsu, for hyundai. Once hyundai got rolling, they started making their own stuff.
 
Im pretty sure its a draw through. I dont actually remember lol. The mitsubishi engine im getting bolts up to my tranny no problems. Cause the block is the same as sigma. Reason why im not going with the sigma is so i dont have tk try and use other parts. And maybe fit... the 3.8 has lots of possibilities that are 100% known to work also has a non variable valve timing option. And im using a standalone to run it anyways also mitsubishi uses coils that have spark ignitors built in them.
what trans/ drive train are you using?

This is all interesting and im hlad to see my old post flourishing again
Me too! I've been sifting through the boards for a while now, trying to figure out a way to condense some of the info we have. And trying to find some local shops to get some "performance parts" made. Mostly jus porting and polishing intake manifolds, and a few custom pieces. imagine if someone could get the stage iv made for purchase on the regular?
 
For me even tho I figured this out I still want to push the limited of the delta before I ever decide to switch to the sigma, rn im working on a turbo build on stock internals going to push the limits of stock internals then fully build a 2.7l and see how far i can push it, will do forged sleeves and all
i fully support that! good luck with the builds