too much boost?

[noss88]

My stock turbo on my 98 gs-t needs a rebuild. anybody know where to get one for a good price or can hook it up around hayward area?

 

[Killa_dsm]

Now not to argue but i thought the mbc could lower and raise your boost, ex. if you came from the nipple on the turbo outlet directly to the the wastegate acuator it would stay open all the time thus no boost, so if you had a mbc and closed it, it would do the same, and if you opened it all the way the boost would go around the wastegate acuator and not open the the wastegate building more boost.

So are you telling me you have boost even at idle and when your boost gauge is at vacuum? Keep in mind your not boosting at idle and cruise. So no it will not open the wastegate.

i think he means even if u have a manual boost controller, you can't lower stock boost but u can raise it, then lower it from what you raised

Yes correct. You get the idea.

Thats a good one, if a person hooked the wastegate up directly how much boost would they get?

What ever the stock 14b actuator is set for which is about 11psi to 12psi.

Yup regardless of what he said, get a manual boost controller and make sure all the vacuum lines are hooked up correctly.

Regardless of what I say? A boost control is installed to INCREASE boost. How are you suppose to decrease boost when the stock actuator is set for 11 to 12psi???

Ok, so compared to the t-25 which has a nipple on the turbo housing connected to the wastegate nipple and boost solenoid. Since the 14b has no nipple on the turbo the solution is to put a nipple on the j-pipe connected to the wastegate an boost solenoid?

I forgot the 2g's have the stock boost solenoid. I forgot what boost the stock solenoids are set for, I think 15psi on a 2g? Some body correct me if I am wrong. But you can connect the vacuum line directly from a nipple on the J-Pipe to the Actuator to run the stock 14b boost pressure. And when you want to increase the boost is when you add a boost controller.

Where in the Bay Area are you located?

 

[Killa_dsm]

Take that boost source and put it to an IC pipe or your Jpipe yes.

This is exactly what I was trying to explain. And some clowns kept insisting on installing a boost controller to lower boost.

 

[Rob10_99]

The lowest boost you can run is dependent on your wastegate setup and spring.
IC pipe to wastegate = lowest possible boost.

 

[noss88]

so from what boost source should i use to go directly to the wastegate? from the intake?

 

[Killa_dsm]

Not the intake. Either J-Pipe or any part of the intercooler piping. But like Rob said you might get some boost creep.

 

[noss88]

so im going to have to go with the tapping a nipple on the j-pipe like you told me before? time to go to homedepot tomorrow...

 

[Killa_dsm]

so im going to have to go with the tapping a nipple on the j-pipe like you told me before? time to go to homedepot tomorrow...

Yes. And you plan on running stock/low boost right? If so then running it directly to the wastegate actuator is the proper way of doing it.
But my question is how are your lines set up now?
???? ---> Stock boost solenoid ----> actuator correct?

What is your ???? connected to? Since you had a shop do it?

 

[noss88]

I know stock with t25 it's boost solenoid to wastegate+turbo housing. My setup is just boost solenoid to wastegate

 

[Killa_dsm]

I know stock with t25 it's boost solenoid to wastegate+turbo housing. My setup is just boost solenoid to wastegate

Well man, I don't remember how stock was hooked up. Its been so long, my bad. But either way you can basically disconnect the lines from the stock boost solenoid, just don't disconnect the electric connection or it will throw a code.

So just to make sure.

J-Pipe nipple ----> 14b wastegate actuator.

EDIT: Here is a quick picture I did in Paint. Look at the red line i drew.

You must be logged in to view this image or video.

 

[noss88]

hah i knew what j-pipe to wastegate means, but thanks for drawing the pic too, visual does help alot of people though...hopefully i dont mess up my j-pipe or anything...

 

[the_mork]

It sounds almost like you don't have a boost reference at all, that is some part of the BCS should connect to some part of the pressurized system, be that on the turbo housing, the intercooler piping, even to the manifold if you absolutely must. As it is if you don't have a boost reference you have absolutely no boost control.

Part of the reason that the change happened when you changed the bolt ons is the difference in the bov. Your stock 2g bov was bleeding off pressure at about 10-14 psi so you wouldn't notice the resulting overboost, your new bov holds pressure pretty well so you now have the ability not only to go fast but also hurt your car.

 

[novem]

I just installed my big 16g last weekend. This through me off also for bit. Because the
t-25 has the boost source on the turbo and the 16g does not. I did the BCS to wastegate,
and the other line off my J-pipe to the top port [BCS] So I was only getting 10psi. Which was only boost from the wastgate. I finally connected the dots in my brain and hooked
everything up like it was stock on the t-25 and got my 15psi back.

Just make sure you use the line that has the restricter comming off the J-pipe to a T fitting, with the wastegate to the bottom port on the BCS and the top port going to your injen port [stock port] between the maf and turbo.

[ BCS ] --------- * intake port before turbo---/
[ BCS ]---------------j-pipe
[ ] /------- wastgate

 

[noss88]

Thanks for the help guys, just bought the stuff from ace hardwar and waiting for the car to coo down, I have a 1/8 drill bit, do I just drill a hole first then slowly make the hole bigger until it's big enough to put the nipple? What if I mess up and make the hole a little too big? Also, do I put the jb weld around the nipple where it touches the pipe? Just making sure I do this correctly so I don't end up having a leak

 

[noss88]

ok i just finished putting a nipple on the j-pipe, how long does JB weld take to dry? should i leave it all night before trying to start the car or should i just go at it? its been like 20 mins since i put the JB...

 

[noss88]

thanks guys! car works perfect now! except this morning the stupid little pin on the wastegate rod broke and fell out....i just fixed it with a cotter pin, works great. Thanks guys!

 

[Killa_dsm]

Glad to hear you got everything figured out!

 

[novem]

Cool. I Did not want to over tighten the fitting going into the filter housing, and I ended up kinking my braded oil line. If its not one thing, its another.

Glad you got it squared away!

N

 

[bnr32_coupe]

Great job! Hope everythings okay!!
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[mheidemanjr]

i got a t-25 with like 20k on it 100 buks!

 

[noss88]

i dunno if everything is really ok now...because im thinking back and comparing the t25 vs 14b turbo, it seems to me like my old t25 felt alot faster or well the boost is stronger, maybe theres a problem with my 14b setup i don't know about...

 

[Killa_dsm]

How much boost are you running now with the 14b?

 

[2point3Tsi]

t25 is like instant-boost. there's not really any lag so its feels really fast, yet runs out of steam before redline. Your 14b should have a lil more punch you'll just have to wait a few hundred rpm later but it will give you more in the upper powerband too.

 

[noss88]

i'm running stock boost so far, sometimes it really feels like the turbo is barley helping, feels like its mostly the motor doing all the work

 

[juanpac0]

Where in the Bay Area are you located? You sure the turbo has no shaft play? You sure your timing is dead on?

 

[noss88]

the turbo is a freshly rebuilt 14b turbo with no shaft play at all. I'm in hayward