Well the title describes it.

I would like to introduce myself. This is my first post here, however not my first time dealing with cars. I recently finished a project on my 2003 SVT Focus. I constructed a Turbo kit not designed for max Power, but a quick spooling fun DD car. Right now I have 10 PSI @ 2,300RPM and it just screams fun.

Many of you have more experience and knowledge with these turbos, and I can't seem to find out how much PSI you can run before overspooling, and throwing a bearing or seal.





P.S Sorry if this is posted in the wrong place. Mods please re-direct if I am.


:liebe011:

THANKS GUY!

I believe the answer is 18 psi.

:offtopic: but 03 svt nice car not to many turboed my buddy had one fun little car good luck with it. :right:

It depends on a number of things. First off, there are multiple turbos that are td04. T25 and t28 are the most popular.

T25 is the stocker on the 2g. Its known as a piece of crap, but it will push around 16 psi. t28 on the other hand will pull strong up to 28 psi. unless you're on an open wastegate, you don't have to really worry about over spooling.

Also, the t25 will start degrading faster after 13 or 14 psi or so.

Yeah what turbo do you have?

Its a TE04H from 89 - 91 Eclipse I believe? But for sure a TE04H


Not a TD** from the evo's

....

Well its not the 14B off that year manual eclipse. (TD05 14B)


... bump

Td04H 13G from the auto 1G

So no one really knows? I was just guessing thats the car it was from...


I just know for sure its a TE04h that can produces 250hp but that doesnt tell me the PSI limit.

If its a td04 series that pushes more than 230hp it has to be the t28.

This help?


I want 15psi? Will it take it?


(IMG:http://i136.photobucket.com/albums/q162/ccurry89/0502082107a.jpg)
(IMG:http://i136.photobucket.com/albums/q162/ccurry89/0502081903a.jpg)

(IMG:http://i136.photobucket.com/albums/q162/ccurry89/1115071707b.jpg)

It is the td04 series...... so its the t28 if it makes over 230?




so like militaryman said 28PSI? so max boost before overspool?

As long as you aren't retarded, you won't overspool a turbo, especially with an internal wastegate. I'd say IF its a t28 you'd be safe in pushing 25-28psi with according mods.

However, there is a chance that it is the 13g off an automatic 1g, which is a much smaller turbo than the t28

Don't worry about what PSI you are running.

What you need to do is tune it so it holds all the way to Redline. Or close to.

I have been tuning myself and noticed it holds 10psi till 6k then drops off to 8psi till 7,200. Whats the trick in tuning?



Or could it be the wastegate?

Basically, that happens because you have reached the max output of that turbo. You can increase the boost if you want but you will not get any more power out of it.

I'd say you pretty much have it tuned the best you are going to get it without some professional help.

When do you get full boost?

what is your redline?

Are you running a Wideband? (if your not thats your next investment.)

Data Logger?

What are you using to tune with?

What does your A/F look like at WOT during boost?

I'm not great at tuning but between the other guys and myself we may be able to get a little more out of it or catch something you didn't and prevent a blown motor. Obviously I'd get it to a dyno but lets try and get it as close to perfect as we can so you can save some money at the Dyno so they don't have to fix much.

Full boost 10psi @ 2,300

Redline 7400

Yes, AEM Wideband

Diablo Predator Datalogging

Pro-racer to write tunes, Predator loads them

A/F 10.0 - 10.3 @ WOT 2,000 - 7,200 RPM

Also not sure if this crowd knows about the J&S Safeguard Knock control System, but I also have that. In a nut shell it allows me to monitor knock and how much timing is being retarded (Individual Cylinders)

http://www.jandssafeguard.com/index.html






Built Motor with Wiseco Pistons 9:1 and Eagle Rods



So I could increase my boost contoller to 15psi, but top end will drop back to 8 cause I'm maxing out the turbo?

correct.

You could probably lean it out a little more as long as your not knocking.

with your monitoring equipment you are in great shape :thumbsup:

you can increase your boost like eric said just keep an eye on your knock but once you get to the higher RPM you are still going to drop off in boost. That turbo is tiny, it looks like the smaller stock turbo from the 1g auto like militaryman said. it has 12 fins and doesn't have the 14b style compressor housing so that's why im guessing its the smaller one.

if you were thinking about a turbo upgrade it would be a good time to think harder about it. you have a strong engine, good engine management, good fuel, good tuning, but your turbo can't keep up because it is just too small. If you are looking for a nice power increase but don't want to get too nuts, keep an eye out for a slightly used big 16g or evo III. you will be glad you did :thumbsup:

be careful leaning it out too much. you will create more heat and might boost creep because that stock wastegate isn' t the most efficient thing in the world