my Ea82T performance Q's

Subafury · Post by **Subafury** » Mon Mar 24, 2008 2:38 pm

hey all

i want a couple of opinions on my turbo engine setup and its ecu.

firstly i have an aftermarket computer and know it must be re tuned everytime there is a significant modification to the engine. i dont really know much more about em than that, but i would like to know how much difference (if at all) im going to feel at the wheel once i get it tuned for my new td04 turbo?

Once this question is answered i also wanna know if its worth putting on my boost controller on to squeeze a few more psi out of the setup. but also i want my motor to last a while longer, i need the reliability, so i dont really wanna blow HG's or anything. but to counter this i have just put on a WAIC so im thinking i should be fairly safe with these boost levels but not sure.

So to summarise, do you think it will be enough to just spend the $300 odd and get it tuned just for the new turbo, or should i chuck the controller on it first before it gets done?

Gannon · Post by **Gannon** » Mon Mar 24, 2008 5:06 pm

Id say overtune it, then run it slighty under tune.

That probably sounds stupid, but here is what i mean.

Lets assume you are runnung 7psi standard boost at the moment.

Attach your boost controller, set it for the maxumum you plan to run,.. say 12 psi. Tune the engine for that 12psi boost level, then wind back the boost to where you are comfortable, which might be 8psi.
You then have an engine tuned for 12psi if you ever wanna use it, but just to be safe, you run at a lower boost level for engine longevity

discopotato03 · Post by **discopotato03** » Mon Mar 24, 2008 6:18 pm

To get the best from it is not terribly difficult but not really free .

EA82T's are really screaming out for a decent header because the std one is pretty pathetic .

If your car had the 4 plug MAF system you can do a few things with interceptors injectors and a partial AFM bypass .
An old trick is to have a modest by pass pipe to flow a bit more air around the meter before the ECU gets to the voltage level where it wants to do rich/retard or ignition cut out . Larger top feed injectors are around and electrically compatible . Bosch VL Commode Turbo fuel pumps fit in easily enough . The interceptor is to modify the signal voltage between the AFM and ECU so you can get the AFR's in the right window .
Please resist the temptation to blindly screw up the boost on an EA82T because they damage pistons easily if other aspects are not addressed .

Its always best to have a fresh engine when pushing turbo engines for extra power , mainly because if the rings are not sealing properly extra boost pressure often means extra blow by .

The benefit of electronic boost control is that the valve prevents any positive manifold pressure from reaching the waste gate controllers diaphragm so it doesn't start to crack open virtually until the target boost is achieved .

I'd be a bit wary of pushing a std EA82T , particularly one with a fair few miles on it . They don't have much of a safety margin because they are a pretty basic low pressure system std .

Cheers A .

D3V1L · Post by **D3V1L** » Mon Mar 24, 2008 6:39 pm

matts motor has been recently rebuilt and its running a microtech ecu..not standard ecu...so all the things mentioned relevent to intake and the standard ecu is not relevent

however injectors and all the mehcanical things are obviosly a plus

discopotato03 · Post by **discopotato03** » Mon Mar 24, 2008 8:43 pm

The point I make is that if his car originally had the 4 plug system meaning the optical CAS/dizzy and transistor then this is the best interface for an EA82 .

A .

brumbyrunner · Post by **brumbyrunner** » Mon Mar 24, 2008 11:08 pm

To answer the question....
I'd say fit the boost controller because you already own it, adjust the boost to where you're happy and then give it a good dynotune.
Then leave it the hell alone.

Outback bloke · Post by **Outback bloke** » Tue Mar 25, 2008 6:19 am

Definitely fit the boost controller. With out it the TD04 will run 6psi. You will feel stuff all at the pedal with the TD04 on there, especially if you don't tune it. Boost will happen at a different time and in a different amount of time.

Also don't tune it then wind it back. All you manage to do then is to put it out of tune. Tune it to 12-13psi and then leave it alone. It defeats the purpose of dyno tuning if you then change settings as soon as you take it off the dyno. A waste of that $300 you just spent.

In case you are wondering about my advice, I used to run a TD04 and Microtech, top mount and all that stuff in one of my RX's. I spent a lot of time and money on it in varying stages of build. I know what worked and what didn't. You can easily run your standard injectors and fuel pump at 12psi.

Subafury · Post by **Subafury** » Tue Mar 25, 2008 10:45 am

BYB-01 wrote:
In case you are wondering about my advice, I used to run a TD04 and Microtech, top mount and all that stuff in one of my RX's. I spent a lot of time and money on it in varying stages of build. I know what worked and what didn't. You can easily run your standard injectors and fuel pump at 12psi.

tell me more about this rx then- did you have it set for 12 psi or more? how long did it last?

thanks for your advice, seems like 12psi should work fairly well then with the std injectors and pump- not too much, not too little, so ill put the boost controller on that and leave it.

EA82T's are really screaming out for a decent header because the std one is pretty pathetic .

i was looking into doing something about this. i bought a wrx up pipe, with the idea that it will will be bigger and better flowing than the std pipe. however once i got my hands on one, it seems like it is an identical size, and still probably too short to get to the first outlet. and its hard to say whether it will fit also, without removing the std one.
maybe it would be easier to get an exhaust shop to make me a bigger pipe just by copying the original.

discopotato03 · Post by **discopotato03** » Tue Mar 25, 2008 11:25 am

The problem is the T shaped "collector" and the actual tube size inside the heat shields/wrap .

What we will probably do is cut a std header before the T joint and fabricate a proper collector . Depending on the final turbo choice it would probably be a good opportunity to change the turbo mount flange to the Liberty/Impreza type and toss the tiny RHB52 turbine housing away .

To soon to research yet but there are a few nice bits creeping into the TDO5/TDO6 range for Rex's . There is a trust spec TDO6SL2 turbine that's an in between O5/O6 size and it may be ok with a 16G compressor .

Cheers A .

Outback bloke · Post by **Outback bloke** » Tue Mar 25, 2008 11:52 am

The RX I had the TD04 on was running 18psi, Microtech MT8x, copper head gaskets and 3" mandrel dump to half car then 2.5 out the back. It had 118kwATW. I ran that motor in that trim for a few years reliably. It had stock fuel pump and injectors.

The only mechanical side of things I did to it was new rings and skimmed the heads. The intercooler was a top mount. Turbosmart adjustable blow off valve.

downloads.php?do=file&id=18

I used to give that car a very hard time and the motor never let me down. Broken diffs and cv's were common.

I only got out of it when I saw the light and started putting EJ20 turbo engines in things.

Subafury · Post by **Subafury** » Tue Mar 25, 2008 7:43 pm

BYB-01 wrote:The RX I had the TD04 on was running 18psi, Microtech MT8x, copper head gaskets and 3" mandrel dump to half car then 2.5 out the back. It had 118kwATW. I ran that motor in that trim for a few years reliably. It had stock fuel pump and injectors.

The only mechanical side of things I did to it was new rings and skimmed the heads. The intercooler was a top mount. Turbosmart adjustable blow off valve.

oo yeh looks the goods. my car's setup is very similar to this one; td04, microtech mt8, std injectors and fuel pump except with 2.5" dump to 2 1/4" pipe. i will have my fake greddy BOV on very soon. HG was replaced about 5 years ago according to receipts so should take some more punishment

im getting all excited about a tune now haha