2G trouble at full boost

[gst_clipse]

hey guys..still a little new to the dsm world but heres my question.. i just put a 1g bov in my 2g (factory intercooler piping since there aftermarket one is on back order) but when i hit full boost the car hesitates and shakes for a good 5-8 seconds before taking off like it should for the most part..does the addition of a 1 g bov cause this or is it a different problem. also my boost gauge sometimes shoots up to 19-20 psi occasionally, could this be because i just added this 1g bov, or could a manual boost controller solve that? thanks guys hope to hear from you...

 

[pitt97gsx]

Without a manual boost, you shouldn't be hitting more than 12psi(stock). If it hesitates then it's probably a boost leak

 

[Bluefire16]

^^ stock boost is between 12-14. All depends on the car. You can take out the filter piece and gain 1 psi.

Do you have a MBC?

You might also have a boost leak.

 

[LiquidX]

Key advice, whenever you add, modify, or remove anything from the pressurized air lines you should perform a boost leak test to be sure that you do not have any leaks. It was prob. the BOV that is causing the problems either because the gasket is leaking or the BOV itself is leaking either from a bad diaphragm or corroded insides.

Do a boost leak test. http://www.dsmtuners.com/forums/new...se-troubleshoot-boost-leak-tester-merged.html It's long but you'll get the general idea. Be sure to use soapy water when you pressurize the system.


Also, you said it occasionally goes to 19psi. When do you notice that it does that and does the 19psi drop down to around 12psi - 14psi after a few seconds?


For the possible spike:
1. Check and make sure you stock BCS is fine and the lines are not kinked up.

2. Make sure the actuator rod is not catching on anything, the actuator can moves the rod when air pressure is applied, and lastly that the wastegate flapper isn't getting stuck either.

 

[GsXdSmKingGsX]

Your sure your hitting 20 with your BCS still in? I cant fathom that being possible

 

[gst_clipse]

Yea I was thinking boost leak but what is with the hard vibrations plus the delay or hesistation at full boost. And no I do not have a mbc.. Would it be a good idea to order one..
Plus I did take my bcs out so could it be possible that I am hitting 15 psi?

 

[goldbomb79]

Think of it this way. If you have a boost leak, air that's already been accounted for through the mass air meter is escaping, but the ecu doesn't know that it's leaked and is adding fuel for the amount of air that's going through the meter. So, the hesitation vibration is probably caused by excess fuel. Does that make sense?

 

[siemens03]

i bought a 1995 eagle talon turbo with a spun rod bearing and redid everything ever sensor every hose anything to do with the motor. the internals are basically stock and the ecm and fuel managment are stock. it has a factory 1g turbo 1g bov injectors walboro 255 3" exhaust and a fidanza lighwight flywheel and one of those MBC that look like a air pressure regulator. the problem. ran the car for a day seems to run great had boost turned down to like 10 psi. the next day i started playing with it and after about 13 or 14 psi it does some crazy stuff like boost pressure is never the same sometimes it will boost 16 or 18 sometimes only about 12 on same MBC setting. Also when boosting at this setting it will pull then (very hard to explain exactly) but its like a violant shudder almost. I made a BLC today and will hopefully find something but wanted to post to start getting some info. Im old school v8 hot rodder never been in the turbo seen this is my first and i dont know anything about turbos. thanks for eberything in advance and will post when i have checked for leaks.

 

[gst_clipse]

That does make sense.. I appreciate the help.
Would it be a good idea to get a mbc if the psi is jumping up past 15 sometimes or is that another problem?

 

[LD25Delta9]

That's a new problem. It's called boost spike. That could be caused by a boost leak in the vac. line to your actuator.

 

[siemens03]

just checked my 95 tsi was leaking some at both the throttle body gasket and i guess what you would call the turbo tube? that feeds the throttle body. gasketys will be here tomorrow will reply then. also what is acceptable? i head the throttle body leaking but started in on everything with soapy water in a squirt bottle. is that overkill? noticed one injector seal barely foaming and the intake in the driver side where it mounts to the head on the bottom side barely foaming. thanks for the help

 

[gst_clipse]

what did u make your blc out of?
i need to make one and check my system i just havent had enough time recently im ordering hard pipes for mine so ill probably just wait until i install them..
and which line is going to the actuator?

 

[siemens03]

i just got a 2" to 1/4 reducer and put a 1/4-1/4 parker qquick connect fitting and then put 1 1/4-1/8 in the end of a blow gun and used a piece of radiator hose.

 

[gst_clipse]

Do u have any pics of it.. I'm trying to get some ideas how to make mine

 

[JayRolla]

That is a little overkill. Just pressurize the system to 5psi above your set boost you usually run. It should hold for a second and slowly bleed off.

 

[siemens03]

thanks jay rolla. and also i have a 1g bov what pressure should it start bleeding off?

 

[AK GSX]

I had a similar problem with the shaking and hesitating and found that it was because the owner before me had put in regular unleaded instead of premium. Made a world of difference.


Sent from my iPhone using Tapatalk

 

[siemens03]

i ran the tank out of gas and put non ethanol 93 in there no change. i dont know how to upload pics or i would gst_clipse. back to the problem i put my new throttle body gaskets on today and checked for leaks seemed pretty good drove down to my friends and it was doing 17-18 flawless till my check engine lite came on then started the same crap. My friend has a brand new 2009 matce determinator and it wont scan my car any of you have this problem? there is two plugs out of the scan tool for this car but there is only one under my dash can anyone tell me if i missing a plug or if the other plug is for non turbo or something. there is no one around here with a turbo car for me to compare things to so sorry for all the questions. thanks for all your help

 

[mtchll]

I had this same kind of thing happen with my 2g, my boost spiking that is. I installed a 1g bov and UICP, and after that I was spiking to about 17psi, but then it'd drop to 14. For some reason I installed a cheap MBC (Which didn't seem to work), so I later re-installed the stock BCS and everything and it went back down to normal boost...

 

[siemens03]

well i already have a 1g bov and i dont know what a UICP is and as far as i can tell me MBC is working the way its suppose to so im lost.

 

[Misterbeechy]

if in anycase.. remove the MBC and see how it runs.. check all piping.. see if your intercooler has any cracks.... take a whole day... remove intercooler pipings.. check for torn couplers cracked pipes.. leaking bov. or any vacuum leaks .. a bad enough vac leak will give bad spool due to engine perfomance

 

[gst_clipse]

I was thinking about buying upper intercooler pipes from dejon.. The two piece package. I was thinking about buying these pipes before the leak occurred.. Hopefully it fixes all the leaks and the adapter for the 2g pipes for the 1g bov isn't all that good of a connection in my opinion
Hopefully it fixes all my leaking problems.. Has anybody used these pipes from dejon before??
Thanks guys

 

[siemens03]

So i think i cured my over 12 psi boost problem. like previously stated i know nothing of these cars and am trying to learn but someone told me to check my spark gap they said it should be like 28 which is very small gap compared to the 600hp v8's im normally dealing with so i tried that and its seems to have cured most all of the boost problems. runs smooth and steady at 16 psi with no spiking or creeping and no cutting out i think some of the problem lies within the 15 year old spark system though so im gonna replace coils and such. anyone know much about those coil over plug setups you can buy?