[MAURYL]

Hello All!

One of the first mods I did on my Supra Turbo when it had the stock turbos was a simple "bleeder" T modification.

Basically, insert a Vacuum T in the boost line that goes to the wastegate. This will fool the wastegate into opening up under a higher boost, since some of the air will be "bleeding" out of the T connector.

The result is that the car boosts higher...making more power! You can limit the amount of bleed by placing a vacuum cap over the T with a smaller hole. However, from my experience, a wide open T only gave an increase of a couple PSI...so it did not overboost like a pulled hose would.

If anyone has done this, where is the best place to put the T into the boost line? I know it must go before the pressure sensor that actuates the wastegates.

Does anyone have the diagrams/pages from the service manual that outlines the turbo boost/vacuum system?

I would try this now...but picking up my car this weekend so I cant.

This is a $.02 modification to increase boost. The stock ECU should correct fuel trims properly.

The only problem that could occur is a check engine light due to fuel cut past a certain boost limit....this is what happens on the Supra. But, there was a little black box (signal clamp) to trick the ECU into not cutting boost at 15psi.

Looking for a quick adder while I wait for V2

---------Added----------------------------------
Here is the Supra Tech Article for Reference.

You will see the T goes between the VSV and wastegate...therefore it doesn't bleed out MAF metered air and does not affect air/fuel trims.

http://www.mkiv.com/techarticles/bleedert/bleedert.htm

Thanks!

[Neema]

hmm never heard of this, but im sure you'll be getting 10 pages of replies within the next few minutes hah.

[RedGT3]

Run and put your flame suite on because they are coming for you.

[RRGOO7]

sounds intresting

[rideelement247]

Originally Posted by MAURYL

Hello All!

One of the first mods I did on my Supra Turbo when it had the stock turbos was a simple "bleeder" T modification.

Basically, insert a Vacuum T in the boost line that goes to the wastegate. This will fool the wastegate into opening up under a higher boost, since some of the air will be "bleeding" out of the T connector.

The result is that the car boosts higher.

If anyone has done this, where is the best place to put the T into the boost line? Is it best to put it before the boost solenoid??

This is a $.02 modification to increase boost. The stock ECU should correct fuel trims properly.

The only problem that could occur is a check engine light due to fuel cut past a certain boost limit....this is what happens on the Supra. But, there was a little black box (signal clamp) to trick the ECU into not cutting boost at 15psi.

Looking for a quick adder while I wait for V2

Thanks!

I don't know if the car will increase or decrease power input. I guarentee a code being thrown, however. I think I remember reading that the turbo recycle air and such...which is why a BOV is not a smart mod because the turbos have to repressure their sealed system, just to depressurize.

Not 100% that's true...maybe someone can chime in. But somewhere on here I believe I remember reading not to BOV a car, so I think it would be the same principle.

Anyone out there with more experience will be able to tell you for sure..I've heard of the bleeding theory, just figured it wouldn't be the safest/most stable mod out there for this car.

[1clean335i]

Originally Posted by rideelement247

But somewhere on here I believe I remember reading not to BOV a car, so I think it would be the same principle.

not everything you read online is true...

[Boostin335]

Lol yup ^^

[schneid4323]

Arent the wastegates electronically controlled on our cars?

[MAURYL]

It definitely is not the most stable...it is a quick fix.

I updated my original post with more input.

The BOV to atmosphere lets out A LOT more air.

The T on the Supra went between a VSV valve and the wastegate, so therefore it did not affect the MAF air meetering/fuel trims.

[MAURYL]

Here is the Supra Tech Article for Reference.

You will see the T goes between the VSV and wastegate...therefore it doesn't bleed out MAF metered air and does not affect air/fuel trims.

http://www.mkiv.com/techarticles/bleedert/bleedert.htm

[533ogetnom]

more importantly, why would limiting the amount of gas going through the turbo increase psi

[schneid4323]

Originally Posted by MAURYL

Here is the Supra Tech Article for Reference.

You will see the T goes between the VSV and wastegate...therefore it doesn't bleed out MAF metered air and does not affect air/fuel trims.

http://www.mkiv.com/techarticles/bleedert/bleedert.htm

They are electronically controlled.

[schneid4323]

and you will piss off the ECU like none other.

[A418t81]

LOL! @ all the turbo newbs up in this thread Mauryl, it won't work. That worked on your supra because the turbo wastegates were pressure actuated, not vaccume actuated like the 335's are. The only thing that would happen if you introduced a bleed into the stock wastegate lines would be no boost.

Also, for future reference, a "bleeder" is just another way of saying manual boost controller in conventional wastegate terms....they are in essence the same thing (I said ESSENCE, I don't want to hear about how a Joe P is ball and spring, etc...they still do the same thing).

D'oh, beaten by that filthy xedeboy

[MAURYL]

AHHHHH....now I'm ghetto! I'm just wondering if this will work, that's all.

Eventually, my Supra had a T72 and was controlled by an AEM....the right way to do it!

Peace!

[A418t81]

Nope, won't work on the stock BMW setup at all. If you want more boost, you have to trick the ecu into giving it to you. See the Xede, Juice Box, Procede, etc threads. BTW, a lot of what I was saying above wasn't directed at you, but just to further the lacking common knowledge seen so far

[MAURYL]

The key is vacuum vs. pressure activated. I know there is pressure in the intake...strange that there's no pressure in the boost lines or to a boost pressure sensor??

[e90AW335i]

Originally Posted by xedeboy

It will not work, boost system is vacuum based. Get a JB you ghetto racer.

[turbotko]

Yep, on most other turbo cars the wastegate uses boost pressure to overcome the spring pressure holding the wastegate closed. On the 335's, vacuum actually overcomes the spring pressure in the wastegate.

Bottom line, it won't work.