so im trying to get my boost to stay at around 8-10psi and i cannot get it to do so. the car is non seq setup with the wastegate actuator running directly to the nipple on the turbo intake comporessor. from what i read this should only be around 7 psi. any thoughts guys? right now no matter what i do the boost stays around 12-15 psi and is wanting to hit fuel cut

 

make sure your boost source is after the turbo, not before.

If you are connected to the plastic intake piece on the turbo, that nipple only sees vacuum and will never activate the actuator, anywhere between the turbo and the engine will work (Y-pipe, intake elbow, upper intake manifold

make sure the hose to the actuator is tight and is not leaking, might be a good idea to try a completely new hose just to make sure you didn't grab the one with the restriction nipple in it

 

^ +1, "turbo intake compressor"? Our stock twins don't have any nipple on the compressor housing, if you have the wastegate hooked up to that black plastic elbow then it will never open.

 

the wastegate spring is 7psi , BUT it also has a restrictor pill which raises the psi to the stock 10-8-10 .

Now , do you have a full exhaust ???

IF SO . you are getting boost creep . did you port the wastegate???

if you are STILL using the stock ECU . you will need to remove the restrictor pills , and replace it with a manual boost controller , and control the boost using that . you will essentially eliminate the whole stock boost control system and run off the boost controller .

 

i will take a picture to easily describe this as its hard to through a keyboard. there are the two nipples coming off the intake side of the turbo which one is where i have going directly to the wastegate actuator. yes i have full exhaust and stock ecu. i have also tried running my mbc and having it hooked up between the wastegate actuator and the nipple coming off the upper intake manifold. what im wondering is if maybe the diaphram in the wastegate actuator is leaking and therefore allowing these higher boost ranges. the wastegate is ported and i can understand some boost creep but in all gears even 1st going as high as 15psi. other hears with more load still dont back down to anywhere near 7 psi only about 13

 

you need 2 manual boost controllers , 1 for the primary turbo to open the diverter to the secondary

and then 1 for the wastegate .

when you use the manual boost controllers you need to take off the restrictor pills sometimes the turbos come with the restrictor pills built INTO the turbo . if thats the case you may need ot port them in order for the MBC to work correctly .

 

car is non seq and there are no pills whatsoever in the system. onlly one wastegate actuator so pretty sure i only need one mbc. where would the pill be in the turbo??

 

This answer is wrong, and only applies to seq when running manual boost control!
Non seq has the divertor removed or welded open.
Do some of you even know what a full non-seq conversion requires?

The one and only correct anwer is that WG was not ported or ported enough.
This is ancient history!

Anything else is bullshit.

Get a PFC to also prevent fuel cut.

I ran non-seq from 1996 - 2004 when I went single turbo.

 

AHH sorry for some reason i thought it was sequential .



ahh ****.... I thought he was running sequential . i'm sorry . my bad completely !

 

if you mean this


then the two nipples on the intake are wrong, those nipples only see vacuum, no boost.

If you're trying to control boost, lose the MBC, connect the UIM directly to the wastegate actuator, if that still doesn't give you 7psi then yes, there is probably something wrong with the actuator. Make sure you use a clean open hose with no nipples in it.

 

no not those..its where the factory prespool hose would go. ill take pics when i get home

 

yes its full non seg....flap has been welded open and the diverter has been removed

 

My guess is that you plug your wastegate actuator directly to the turbo and forget to cap off the second nipple on the wastegate actuator!

 

When I went full non sequential, I ported the WG but not enough. I had to put a home made restrictor gasket between the MP and catback in order to not get boost creep.

Later I took the turbos out and ported the WG even larger, then it worked 100% correctly.

 

fixed! i replaced the wastegate actuator and also found what i think was the cause.... where the wastegate goes to the wastegate controller solenoid there are two nipples on that. i had the hose going from the wastegate actuator to the top nipple and the bottom nipple open. i capped that nipple and bam 7 psi it is