xt non turbo to turbo?

[svxin]

i have a 1987 subaru xt with the ea82 motor non turbo. the car is 2wd 5 spd and i am thinking about doing a custom turbo setup on it. my question is has anyone done this yet and if so what did u do for fuel managment and timing?. i was thinking about the msd boost timing master, http://www.msdignition.com/tc_18.htm for removing timing when under boost and something like a vortech rising rate fpr 12:1 also will the stock injectors peak out with a meir 6 or 7 psi of boost or will the motor not hold up? just thinking thats all any input or advice will be helpfull.

[idosubaru]

sell the engine and get a turbo engine to drop in there. they can be found inexpensively and that's a much better way to go. you can get to 200hp easily with the stock ECU, no fuel controller needed.

[archemitis]

yar! turbo and na computers and wiring are the same! =]

[svxin]

yeah i know i could just pop in a turbo motor but its more fun to make your own set up im not to worried about the fabracating of the up pipes and down pipes etc. i plan on using a front or side mount intercooler also an external wastegate and yet another question how does the maf respond to boost im not to fimiller with the xts engine managment system shouldnt be to indepth due to the age of the car.....

[idosubaru]

i'm speaking of swapping the turbo engine in place so you have turbo pistons in the car. still plenty of fabricating and playing for you to do with exhaust and plumbing. you'll have turbo instead of NA pistons. you could pull the heads and install turbo pistons if you're ambitious.

 

otherwise you will be fine with 6-7 psi boost.

[archemitis]

or pull your heads, do some measuing of cubic centimeters. do some math. and remove a few ccs fromt he heads. then you got the flat top pistons(better cross flow from exh valve to int valve) and the lower comp.

 

if i was gonna do it, id take it down to about what subaru had, but not quite that low.

[svxin]

i thought the stock comp was already low on the ea82 something like 9:1 that should be plenty low for my set up and i didnt want to lower the comp any more so i dont have as much turbo lag i will prob be using a t3 with a super 60 wheel nothing big just for a lil pep.

[idosubaru]

copy that, you'll be fine with stock fuel control. a good fuel controller would be nice though and probably smooth the car out a good bit if you want one.

[MilesFox]

the mpfi non turbo and turbo ecu is the same on xts, it will run a turbo just the same. the only thing different is the groundin on one of the pinouts that identifies the ecu as na or turbo, you can mke the right ground to let the ecu identify itself as a turbo

 

the non turbo pistond are 9,5 compression, the turbo pistons are 7.7 compression. going turbo in this would be the same as building turbos on an spfi block. you can do this so long as you know what to expect, and to tune your engine management accordingly. a surbo and its exhausts will bolt on, as well as the water pipe, but you will have to tap the back of the head for the oil line, or run a custom lenght off the oil ump. you will also have to add a oil return line for the turbo, a 1/2" fitting rubber hose.

 

you would be better off finding a complete turbo motor, as it will plug and play, if you have the spider intake you can keep that but you will have to plumb in the turbo inlets. you can use a carb block for 9.0 compression, and swap your heads with the modifications in mind

 

what else would be ideal if you keep your short block is to get some turbo heads for the the fittings, and the turbo cams. you will want turbo cams or have the stock cams reground to have less valve overlap fr the turbo. if you go this route you can also change out the pistons. you can swap in turbo pistons, but if you like the idea of higher compression carb pistons will be ideal for running stock engine manegement. ea82 carb pistons are 9.0 and ea81 pistons are 8.5, any of these pistons will fit the same. spfi pistons are the 9.5 as well as the pistons in the motro you have now