sr20det bog during boost

[240probs]

Hey guys i need some help
Here is my issue
Everytime i hit boost i bog really really bad
What i have done
Sr red top fully built block cp pistons 8.1
Turbo is a t28 at 15 psi
Nismo fpr set fuel pressure at 40psi idle
Oem 370cc injectors
Walbro fuel pump
Spark plug gap at .028
I guess i dunno whats going on
Oem ecu not tuned ineed help

[240probs]

Btw afr doesnt go past 13.1

[Lobo240sx]

You need bigger injectors 440CC or higher with a proper tune.

[PapaSmurf2k3]

Is it misfiring at all, or just bogging?
Do you know if your ignition timing is set correctly?

[240probs]

Ignition timing on point checked the dows together in line on the cas. I have a belief i suspected a boost leak originally so i sprayed couplers with hairspray..(it works) clamped them on and i lossened my bov to open sooner because i decreased boost it was at 18psi no tune 50psi idle pressure not my deal someone elses that i bought it from i wanted to play it safe so i set it to 15psi i did that and allhell broke loose

Originally it was 18psi no tune oem injectors bogged it third 1st and second pulled flawlessly

Turned down boost
Fixed a massive boost leak loosened the bov
Set my fpr to 40psi idle supposed to be 37.5 id rather run a little rich then lean
Thats what i got from adjusting fuel press
Im just annoyed i guess i dont wanna blow this thing up i just want a reliable car and since purchase its been a pain in my a** keeping it from blowing up im close to sell it i need help

[PapaSmurf2k3]

You need to get a wideband O2 sensor and figure out what's going on. Shooting in the dark is dangerous.
Basically, you need a tune.

[240probs]

I have a wideband as well all i want is it to be stock boost maybe a little more i just want it to be close to stock just be more efficient what do i need to do how do i turn down the boost cause it wont go lower with the boost controller do i pull the turbo off and adjust the wastegate or can i swap my t28 garret on it if not and i have to adjust mine do i twist it twords the exhaust or farther away basically to i twist in or out

[240probs]

Or can i get the boost controller to lower boost levels lower the the wastegate setting cause i ordered the quick nipple that goes in the rubber coupler on the hotpipe cause apparently the boost controller was installed wrong

[PapaSmurf2k3]

You can only go as low as the wastegate setting. To get the lowest boost, your wastegate should be hooked up directly to the charge piping. You shouldn't have a boost controller between the 2.

[240probs]

Ok right now the wastegate vac hose is on a t with the bov going to the throttle body i ordered one of those quick nipple things to put in my coupler on the hot pipe to seperate the bov and wastegate the guy that did this swap was kinda half a** so set my wastegate lower i take it i twist the peice away from the vac nipple on the waste gate so it opens sooner? Or tword? Basically do i make the bracket longer or shorter to lower boost levels and im at 15psi now how many turns till i get 7-9 psi?

[240probs]

Merry christmas by the way thank you for your help even on a holiday!

[Ken@PTUNING]

Ok right now the wastegate vac hose is on a t with the bov going to the throttle body i ordered one of those quick nipple things to put in my coupler on the hot pipe to seperate the bov and wastegate the guy that did this swap was kinda half a** so set my wastegate lower i take it i twist the peice away from the vac nipple on the waste gate so it opens sooner? Or tword? Basically do i make the bracket longer or shorter to lower boost levels and im at 15psi now how many turns till i get 7-9 psi?

You're mistaking an adjustable wastegate actuator for a boost controller. Can you take a picture of your setup?

To adjust the actuator rod properly, the rod should be just long enough to keep the wastegate door closed. Too long and it'll keep the door open. Too tight and you'll raise the target boost and crack pressure. Remove the C-clip and set the rod so that it slides right over door lever. Shorten the rod so it's just 2-3mm too short. That should be just enough.

Chances are that you have an aftermarket wastegate actuator, likely with a 12-14psi spring. Does it look something like this?:
http://www.atpturbo.com/mm5/merchant.mv ... _Code=VSR2

[240probs]

Yes looks just like that its a godspeed gt2871r .60ar and its adjustable wastegate i was told im maxing out my injectors 370cc oem i just want this thing reliable my garret t25 has alot of up down side side in and out shaft play and i cant find anyone to rebuild it and this turbo was already on the car...

I only have a phone no computer and i cant figure out how to post pics so to lower boost levels i make the rod longer?

[Ken@PTUNING]

You can only do so much with the actuator. That only sets the preload. Ultimately, the lowest boost you can get is what the spring pressure of the actuator is. If you do have the 12-14psi actuator, you'll need to completely swap out the wastegate.

[240probs]

Here is my set up i have the red top sr
Godspeed gt2871r
Turbo xs bov recirc
Mishimoto fmic and intercooler piping
The vac liness are routed as follows
Top left throttle body vac source is going too my bov in between the throttle body and bov
There is a T that goes to the bov and wastegate
The upper right throttle body vac source is to my regulator in between is a T to my boost gauge the boost controller i removed so its just off the wastegate to regulate boost
I purchased a quick tap nipple that goes into therubber couplers for my hotpipe so i can feed the wastegate directly there and the bov isno longer T'd off
I hate working on others projects so i wanna start ground zero and go from there.

[240probs]

So can i pull my garret wastegate off of the t25 and swap?or am i just screwed lol

[Ken@PTUNING]

You can try that but I'm not sure if it'll fit. If they're exactly the same physically, use the T25 actuator.

[240probs]

Ok so i read up on my turbo the actuators come out set at 8psi is it possiable the kid dialed it in super high to make it open at 15psi other the a aftermarket actuator?

[Ken@PTUNING]

Sure. The actuator has so much preload that it can't open until the higher boost pressure. Check the preload as I described above.

[240probs]

Well from what i read 1full turn is the equivilant to 3-4 psi so ill do 2 full turns and see how she goes ill post a update soon if i still get a sputter or bog do i check boost leaks cause my car in the best way to deacribe it...it goes bwhaaaaa whapow.. Whaaaaaa like a stupid bad back fire so if that dont work i guess ill just reseal everything again lol what should fpr psi setting be at 9psi 43.5 no vac and 37 with vacume?

[Ken@PTUNING]

I've already explained how to properly check the preload above. Try your way but if you keep extending it too much, you're just going to unseat the flapper door and it will boost slower, not necessarily lower.

I'd need to see a video, or a datalog, to understand what you're describing.

If your base fuel pressure is set to 43.5psi, then at 9psi of boost, it should be 52.5psi. It's a 1:1 ratio.

[240probs]

Not ganna lie the fpr part was incrediably over my education level lol

[Ken@PTUNING]

For every PSI of boost pressure, the fuel pressure should rise by the same amount. For every PSI of vacuum, the fuel pressure will fall by the same amount. This is a 1:1 ratio.

[240probs]

Ok got it so whats the oem fuel pressure level at 7psi?

[Ken@PTUNING]

Stock fuel pressure is 43.5psi. At 7psi, 43.5+7=50.5psi.

[240probs]

Oh s*** ok i get it now ok now my question is now is that with vac at idle and how do i know if it reaches 50.5psi at boost cause my gauge is in the engine bay lol and ican set it at idle but i have no clue during driving?

[Ken@PTUNING]

Unless you're dynoing the car or have an electronic fuel pressure gauge, you don't know.

To set fuel pressure, disconnect the vacuum reference line with the car running. Set the pressure. Reconnect the line. You should see the pressure drop from 43.5psi to about 37psi at idle when you reconnect the line.

[240probs]

Then do i turn it to 53.5 or does it just do it on its own i know how to set it i guess my question is just how do i know it reaches the 53.5 at 7 psi

[240probs]

Sorry im asking so much i just want to cover all grounds so there is no error i just wanna do it right the first time

[240probs]

Not 53.5 50.5