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?

 

[eclipseGSTud]

I have the stock T-25 from my 98 GST in my closet. If you're interested in purchasing let me know.

 

[noss88]

thanks, but i already bought one of ragdollstalon's turbo. I have a question, after installing the 14b turbo, on my completely stock 2g eclipse, do i need any supporting mods? a new bov? mbc? upgraded fuel pump? I want to keep the car as close to stock as possible, but im still ok with at least a new bov or some simple bolt ons

 

[Tre3zy]

i dont think that you would need any supporting mods on the 14b unless your gonna boost more than the stock 7-10 psi....

 

[noss88]

i see, so once i get the turbo installed, what psi will the car be running? as much as the t25? or do i need a mcb make it back to stock psi for the 14b?

 

[juanpac0]

i see, so once i get the turbo installed, what psi will the car be running? as much as the t25? or do i need a mcb make it back to stock psi for the 14b?

MBCs can only raise boost, not lower it. Your stock wastegate will open at around 11-12psi, so that's where you should be after you install the turbo.

 

[noss88]

ok so i got the 14b turbo i got from ragdollstalon installed. along the way i installed my k&n intake filter and greddy type s bov. Before i installed the intake filter and new bov my boost gauge would read around 15psi, then after i installed the intake filter and new bov, the boost gauge is reading 20 psi and at full boost the car would buck and the boost gauge would bounce from 20psi to 23psi. what might be the problem? and is it normal for the car to increase up to 20psi with only an intake and bov mod?

 

[gieri002]

Yes, your old plastic BOV is only good to about 15psi and everything after that it will just leak out. Since you installed a new BOV, it can hold more pressure instead of just leaking it out. In order to solve your problem you will need to install a MBC (manual boost controller). This will allow you to control the amount of boost that you run. The bucking you are talking about is referred to as fuel cut and this is because you are running to much boost and your stock fuel pump and injectors are not able to pump enough fuel for all the air the engine is now getting with the added boost. If you would like to keep running the amount of boost you are running you will need at least a bigger pump, and I would recommend something to tune the car with as well. Just search around and you will find the solutions to all your problems.

 

[Killa_dsm]

Yes, your old plastic BOV is only good to about 15psi and everything after that it will just leak out. Since you installed a new BOV, it can hold more pressure instead of just leaking it out. In order to solve your problem you will need to install a MBC (manual boost controller). This will allow you to control the amount of boost that you run.

Wrong information. Adding a MBC will not help his problem since a boost controller is used to increase boost not decrease it. Did you connect a boost source to your 14b wastegate actuator? Because the t25 come with a nipple on the compressor housing while the 14b's doesn't. Where did you connect the actuator vacuum line to? The J-pipe to the actuator should be the correct way to run wastegate pressure.

 

[noss88]

i'm not too sure about where the actuator vacuum line is connected, i had my mechanic do the turbo swap for me, but i'll check it out tomorrow thanks for the help guys

 

[noss88]

also, since the J pipe to the wastegate is the correct way and my stock LICP and J pipe doesnt have a nipple on it, does that mean i need to get a LICP with a nipple on it to connect it to the wastegate?

 

[Killa_dsm]

Do you know what J-Pipe you are using? Do you have any pics? If you don't have a nipple on your J-pipe you can always go to a hardware store and buy a nipple. Then drill and tap it. But a picture would be great.

 

[noss88]

i know im using the forcedperformance installation kit, how would i go about tapping a nipple on the j-pipe? I just looked at my setup and the wastegate is connected to the boost solenoid?

 

[Killa_dsm]

Just drill and tap the j-pipe with the appropriate size nipple. Then run a vacuum line from there to the wastegate actuator.
http://www.dsmtuners.com/forums/bolt-tech/269122-resolved-need-j-pipe-nipple.html

Where is your weastegate actuator line running to now?

 

[noss88]

its running to the wastegate solenoid

 

[flying_eagle]

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.

 

[noss88]

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

 

[flying_eagle]

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

 

[noss88]

according to the previous posts, im supposed to get stock boost around 11-12psi, but once i got the turbo installed on my completely stock car, it was hitting the limit of my BOV at 15psi, then after i put on my k&n filter + greddy type S bov, my boost gauge would read 20psi at max boost then it would flap like crazy between 20psi to 23 psi

 

[flying_eagle]

I would start with a Manual Boost Controller, and to check it you can easily put the vacuum from the turbo nipple( now like killa said you need a nipple on the j-pipe)to the wastegate and that will lower the boost as low as it can possibly go by holding open your wastegate and letting the exhaust bypass the turbo

 

[gieri002]

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

 

[noss88]

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?

 

[noss88]

I posted my problem on the regional forum, but i thought i'd get a better and faster response on here. http://www.dsmtuners.com/forums/norcal-dsm-forum/340581-need-turbo-rebuild.html

Here are the information about my car:
1998 GS-T
Just replaced the old t25 with a 14b with the installation kit from Forced Performance.
k&n filter
boost gauge.
dejon upper intercooler pipe with a greddy type s bov.

Here is the scenario:

After i replaced the t25 turbo with a 14b turbo, i installed the k&n filter and upper intercooler pipe with the greddy type s bov. Before, the car's max boost was 14psi (with everything stock except the 14b turbo) and the car didn't feel as fast as it was when i had the t25, but after added the upper pipe, bov, and intake, the car would boost up to 20 psi and when i continue flooring it, it would flap at 20-23 psi. What could be the problem?

In the regional forum, somebody was wondering where i tapped my wastegate actuator to, like stock, its connected to the boost solenoid, but before the 14b turbo install, it was also connected to the turbo, but since the turbo housing on the 14b doesn't have the nipple like the t25 does, he suggested i should install a nipple on the j-pipe and connect that to the wastegate actuator/boost solenoid. Would this fix my problem? Thanks

 

[Rob10_99]

Take that boost source and put it to an IC pipe or your Jpipe yes. Sounds like mild boost creep is all.
Sounds pretty normal for a stock 14b, but honestly its all hot air past 18psi.

 

[noss88]

but its not normal for such simple mods for the boost level to be that high is it?

 

[Rob10_99]

Boost is purely dependent on load and your wastegate setting.
Being stock wastegate, route your wastegate line directly to your boost source bypassing that BCS.
See what you run after that.