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update 86 turbo xt mods


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#1 dj72

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Posted 21 August 2003 - 08:51 PM

I disconected the over boost control valve and installed a turbo boost control valve in front of the wastegate. Turned up the boost from 7lbs to 11lbs and oh what a difference, i tried it at 14lbs for a few mins but i'll need better fuel injectors to stay at that psi. The cat,resonator and small pipe is gone and in its place i put 2 1/4 inch pipe, and that also helped quite a bit. Also does anybody have a good suggestion for a muffler, i want a good one but i still want a little back presure for the turbo or does it matter. Also after i finished these mods today me and my buddy with a 86 cobra mustang had a little race on the highway and both times we raced he couldn't keep up, not bad for ea82t. The more i do the faster the little thing goes. Does anybody have any other mods that is possible for this car? more updates soon, dj

#2 Hondasucks

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Posted 22 August 2003 - 01:36 AM

You might want to consider an intercooler, running high amounts of boost generates a lot of heat, an intercooler will reduce this heat, making the intake charge denser, which in turn gives you more power. Will also decrease the liklihood of detonation.
Now, you will also probably want to get a good A/F Ratio meter, adn a boost gauge. The boost gauge will help keep you from running too high a boost, say, if your wastegate decides to stick shut, and the AF meter will show you if you are running lean, a condition which can melt pistons, among other things.

Also, take your airbox out and cut the bottom of it out, this will increase the intake airflow. You can also remove the intake silencer out of the passenger side fenderwell, but this is not 100% necessary if you cut out the airbox. This will also make your car make cool turbo sucking noises that make the ricers scatter:brow:

#3 bushbasher

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Posted 22 August 2003 - 02:30 AM

when i took the exhaust and intake silencer off my old t-wagon, my jeep friend was quivering in fear and awe of my throaty burble, and those sexy intake noises. He didn't want to start up his little bshhoom bshoom bang put put 4.0! Ah that coupled with a 7500 rpm neutral to drive launch in the gravel put me at the top of the pecking order! Too bad my T-wagon didn't last too long :banghead: oh well it had 300+k km, and a blown h gasket anyway

#4 dj72

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Posted 22 August 2003 - 10:18 AM

Well i do have a boost gauge, and i have been looking for an intercooler. I did find one out of a 740 turbo volvo but it is kinda big, i also found one out of a turbo firefly but that one looks to small. I did replace the 195 therm with a 160 therm and hooked up a 10 inch electric fan to run full time when the car is running and it is running alot cooler than before. I'm going to cut the airbox today and see what happens. I was also thinking of going with those iridium sparkplugs but would they make that much of a difference? Dj

#5 calebz

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Posted 22 August 2003 - 10:22 AM

Turbo FireFly?

#6 bushbasher

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Posted 22 August 2003 - 11:07 AM

sure, youve never seen a turbo chevy sprint (turbo 3 cyl I think)?

#7 calebz

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Posted 22 August 2003 - 11:46 AM

Only heard of them.. probably because I tend to not notice things like that.. sprints.. dodge daytona 2.2s ..chrysler K-cars...ford fajitas.. little fall apart POSs

#8 Myxalplyx

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Posted 22 August 2003 - 07:45 PM

Glad to read about your turbo mod project. You'll get arguments about whether your turbo needs back pressure or not. The general consensus is that the bigger your exhaust diameter is, the better for your turbo to spool up. No exhaust (muffler) is the best. It's not always true. For your car, I'd go with a 2.5" exhaust. A 2.5" Dynomax turbo muffler should be nice on your car. A lot of guys here have modified their old school scoobies so they should be able to help you out.

I'd be weary of just cranking of the boost. An intercooler is a good idea. I've read that a Saab 900 intercooler should work ok on your car. Also, an air/fuel ratio and an EGT gauge would be a good idea. At least an EGT gauge to look at your exhaust temps.

This is a start. Good luck! I hope to someday own a turbo 1.8ltr engine from one of these guys that is in good condition so I can start modifying it. L8Rs

#9 dj72

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Posted 23 August 2003 - 02:03 AM

I do know where there are a few saab's so i'll look into that tommorow, thanks. I did cut out the bottom of the airbox today and yes it did make a difference, so i would recommend doing that for anybody. Does anybody know exactly where the air intake silencer is and what does it look like,i don't want to unhook the wrong thing. Also if anybody wants an easy way to make your car run about 10-20 degrees cooler buy a product called Water Wetter from the company redline it works awesome. Today i was looking at the new STI and i'll probably be ordering the hoodscoop for my car, it looks like an easy fit plus it looks cool and it will be very functional. The price wasn't too bad either $249 includes the scoop and all the hardware to mount it. Any other info on mods would be greatly appreciated i'm just having a blast blowing these ricers away. Dj.

#10 DoughtCom

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Posted 23 August 2003 - 01:38 PM

I found a starion intercooler on ebay for 50 bucks, you should take a look at it. Those look really nice, it would make for a good setup on our cars too.

It's going to be a while before I get to that point. Found out the Exhaust manifold pipe had a huge hole in it, and basically broke in half. Now I need to find a new one :(

#11 dj72

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Posted 23 August 2003 - 03:57 PM

I did find the intercooler on ebay and i'll be e-mailing him for some more info and i'll see from there. Thank you very much. Dj

#12 archemitis

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Posted 23 August 2003 - 04:33 PM

if you are thinking about intercooler... you better plumb in a blow off or recirculation valve. it will help alot too

#13 Skip

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Posted 23 August 2003 - 04:55 PM

ah actualy the Subaru engineers must have given thought to the problem that a blow off valve or By Pass valve is suppose to solve. (i.e. the boost pressure bouncing off a rapidly closed throttle plate and hitting the turbo's impellor thus slowing it down.)
They did this by using a "dash pot"
Little known and not often mentioned devise slows the throttle closing just before idle and allows some of the boost pressure leak by the throttle butterfly.
I have a Volvo By Pass valve unit fitted to my 87 5 speed turbo and it does help a little compared to the well adjusted dash pot.
Newer cars use BPV's because they have higher factory boost pressures.

Here is a link to a picture of a few of my mods
It is a Starion intercooler BTW
http://www.westol.co...gwdescsmall.jpg
email me if you have any questions
neper@westol.com

#14 Myxalplyx

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Posted 23 August 2003 - 10:22 PM

Originally posted by Skip
Here is a link to a picture of a few of my mods
It is a Starion intercooler BTW
http://www.westol.co...gwdescsmall.jpg
email me if you have any questions
neper@westol.com



Aha! So that's YOUR wagon that I have seen pics of. I remember reading off of your website of your wagon before and had planned on doing similar mods to an old school scooby I had planned on buying off of Dennis here. Those mods seem really cool (pun intended) and helpful. Really nice ride Skip!

Skips Turbo/Intercooled Wagon Page

#15 dj72

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Posted 24 August 2003 - 12:07 AM

I don't think i need a blow off valve because there seems to be no lag at all between shifts or any time. I know the intercooler will work once i can find one that will work okay. I would prefer a front mount compared to a top mount but if i can't find one i geuss i'll have to go with a top mount. I would also like to install a water injection once i finally find the intercooler, anybody know of any good injections out there? Dj.

#16 dj72

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Posted 26 August 2003 - 02:35 AM

Does anyone have any timeslips that i could compare mine too, i'm just curious to see what other turbo soobs do. My best so far is a 15.8 at 83mph. I would also like to know if anybody has upgraded their fuel injectors on an ea82t and what size and maybe some part numbers. Thats what i'm going to work on next since i finally found an intercooler (92 supercharged cougar). dj

#17 XSNRG

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Posted 26 August 2003 - 10:17 AM

You can probably use any size exhaust you want from the turbo back without worrying about to little back pressure since the up pipe from the heads to the turbo has a small hole where it goes into the turbo and likewise the turbo has a small inlet hole too. There was a guy in Aussie, I think, that was making headers for these, with good luck.

The WRX hood scope is difficult to mount on the EA82. It's wider than the hump on the hood. Subarutex is getting contact info for a company that makes a WRX style scoop that is narrow enough to fit there and looks really good. He has one on his 87 RX and it's stylish yet functional:headbang:

#18 Myxalplyx

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Posted 27 August 2003 - 01:02 AM

Originally posted by dj72
Does anyone have any timeslips that i could compare mine too, i'm just curious to see what other turbo soobs do. My best so far is a 15.8 at 83mph. I would also like to know if anybody has upgraded their fuel injectors on an ea82t and what size and maybe some part numbers. Thats what i'm going to work on next since i finally found an intercooler (92 supercharged cougar). dj



For timeslips and such, you can contact a gentleman in Alaska whose name is David Gronemeier. A guy on the Yahoo XT6 forums (named Red#6) told me about him. He has a 1.8ltr XT turbo running mid to high 13 second 1/4 mile times. I'm sure David is using something for fuel management, upgraded injectors or both. David's email address is: Meritage@cgi.net Let me know if it doesn't work because that's what I have at the Subaru 1/4 Mile Registry that I run.

Another David (David Gustavsson) of ProECM uses a fuel injection controller on his XT6. It's called a ProECM Fuel Injection M1 #EFIM-1. Stop by the ProECM site to email him for more info about it. I plan on using it on my XT6. Here is info he sent me in July about it. I'm not sure if the unit(s) is ready though. The info is quite long. Good luck!


ProECM Fuel Injection M1 #EFIM-1

Reached the fueling limit of the stock ECU? ProECM M1 is the answer, a
completely programmable fuel injector controller. The M1 fuel injector
controller is a piggyback controller that makes it possible to control
extra
injectors in a way that only full blown stand alone Engine Management
units
have been able to do before. The M1 rivals the functionality of a
complete
Engine Management, but delivered for significantly lowered cost. The
ProECM
M1 does not use two tables to calculate a 3D surface. It is a
completely
non-linear system for true non-linear programming. This is a necessity
to
accomplish exact A/F ratios in all operating conditions. The ProECM M1
installs in parallel with the stock ECU to utilize the stock sensors.
This
makes for a very flexible and powerful control unit that will define a
new
era of additional fuel injector controllers. With a very powerful
programmable peak and hold drivers, the ProECM M1 is capable of driving
both
high and low impedance injectors.

Sensor Inputs:
All these sensor inputs are optional except for the MAP (Intake
manifold
vacuum hose) and crank trigger. This makes the ProECM M1 very capable,
yet
very simple to install.

a.. Throttle position sensor
b.. Intake manifold absolute pressure (MAP sensor)
c.. Intake air temperature (IAT)
d.. Engine coolant temperature (ECT)
e.. Built in pressure sensor up to 20lbs of boost
f.. Built in Battery voltage sensing.
g.. Auxiliary Analog input 1, can be used for oxygen sensor.
h.. Crank trigger.
Outputs:
a.. 4 channels to control fuel injectors. Up to 4 injectors per
channel
for a total of 16 injectors.
b.. RS232 for data logging.
Features:
a.. Base map uses 0RPM up to 12400 RPM at 200RPM intervals and 0 to
36lbs
of absolute pressure with 17 programming points. 561 Programming
points.
Linear interpolation between programming points.
b.. Base time is programmable between 0-655.35 ms, with 0.01 ms
granularity.
c.. Data logging functionality. Logs all sensor inputs and RPM.
Applications:

a.. The ProECM M1 is a universal fuel injector controller designed to
be
fitted as an additional fuel injector controller that can be fitted on
any
engine using the sensors desirable for tuning.
Includes:

a.. Comes with Windows based tuning software
b.. RS232 Computer cable.
c.. Installation manual and wiring diagrams

#19 dj72

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Posted 27 August 2003 - 08:34 PM

Thanks for the info, i just e-mailed him ,so now i'll wait for a response. I'm going to check out that site now and i'll go from there. thanks again, Dj

#20 Myxalplyx

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Posted 22 September 2003 - 02:55 PM

Any updated!?!

#21 dj72

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Posted 23 September 2003 - 01:35 PM

Well the oil pump went on my motor so i have to tear it apart and fix it, so since i have to tear it apart i'm going to go all the way. I'm going to find out how much i can bore out the motor so i can get a bigger displacement plus some forged pistons, also going to see if i can find a performance cam for this little 1.8. Also going to put a bigger turbo and quite possibly nitrous. More updates soon.

#22 Dennis ex24

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Posted 23 September 2003 - 03:01 PM

hey DJ

keep me posted on your progress...my car (still a work in progress) is set up similar to what youre attempting, pretty interesting...

the biggest bore pistons subaru sells for EA82ts is .050 over but i totally forget if theyre availible forged or not, i believe they are but you have to request them specifically.

about the turbo, the one on my XT installed by the previous owner is a VF10/11 from a 2.2l legacy with WRX exhaust there after. its a tight squeeze, and the converters sit a little lower then id like, but the sound is awesome and theres so many different ways you could go aftermarket if you went with this set up. plus its a nice upgrade from stock, and so many people on iclub are ditching the stock systems for aftermarket...

hot cams are availible from a company called paeco i think, they have a website...just do a search and you should come up with it.

my car is in a wierd "pre-tuned stage" right now. its very fast, yet reliable but there are a bunch of things that need to be squared away to make it a true runner. im having a weak spark issue, and this is with a monster blaster 2 coil from MSD, i need an A/F gauge installed badly and some suitable wheels to go with the 5 lug hub swap.

feel free to email if you wanna shoot the proverbial bull

#23 dj72

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Posted 08 October 2003 - 09:03 PM

Thanks for the info. I have been talking to Carl at Paeco industries and he is custom making me my camshafts for me to the specs i gave him. I've also got the 50 over pistons o order. All said and done the motor should be pushing from 300-325hp, then with the 100 shot of nitrous on top of all this this is going to be one fun ride. To hook up all this power i'll be using bfg drag radials, can't wait to try it out. Should be done everything in about 3 weeks. More updates soon. thank you again for the info you gave me.

#24 Myxalplyx

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Posted 26 October 2003 - 08:34 PM

Originally posted by dj72
Thanks for the info. I have been talking to Carl at Paeco industries and he is custom making me my camshafts for me to the specs i gave him. I've also got the 50 over pistons o order. All said and done the motor should be pushing from 300-325hp, then with the 100 shot of nitrous on top of all this this is going to be one fun ride. To hook up all this power i'll be using bfg drag radials, can't wait to try it out. Should be done everything in about 3 weeks. More updates soon. thank you again for the info you gave me.



Hey DJ72,

Well, projects rarely end on time or as planned but just in case.......3 weeks will be this Wednesday, 10-29-03. So how are things coming along? :-) Did you get those cams back from Paeco Industries yet?

#25 baccaruda

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Posted 27 October 2003 - 12:14 AM

300-325 hp in an EA82T? keep in mind it's only got three main bearings instead of 5.. you might consider adding a way to squirt oil onto the underside of the piston to help with cooling. and definitely use gen 3 EA82T heads as they handle heat the best. good luck!




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