Hello all

New2my04srt4 said:

Sweet I emailed him he sounds cool. Quick question my turbo is ran straight to wastegate 12lb spring I have bought and sent back 2 manual boost controllers now no matter how loose or tight I make them it maxes out my guage so I have to let go. I'm using same nipple on wg and just putting directly turbo to bc to wg same spot what gives I now realize maybe there's 2 different nipples on wg but I left it on the same it was already. And I tried to check vac line to see if it was ripped and burnt the shit out myself. Anyways if I take off MBC and just go wg to turbo it's still 12psi no issues with leaks on line. Should I be going to different nipple on wg or because my spring is 12lb? Or should I just get another spring for say 18lbs? Sorry for stupid question I'm just stumped

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IF the spring is a 12 lb rated spring

with a direct line from turbo to wastegate with nothing inbetween, you should hit 12 psi and only 12 psi

with a manual boost controller the minimum you will hit is 12 psi until you start opening the manual boost contoller bleed port then you will only make more psi.

if you want less you will have to change the spring.

inside the wastegate there is a diaphragm that controls the wastegate valve position which is vital to boost control.
the spring pushes on the top of the diaphragm to keep the wastegate valve to close it
and the vacuum line thats ran from the turbo to wastegate is connected to the bottom side of the diaphragm
so as you make boost pressure that pressure will overcome the spring pressure and open the wastegate allowing the turbo to slow down to maintain boost control.

hope you can make sense of that ^

New2my04srt4 said:

First I'd like to say thank you for the reply. I understand the least boost is 12psi because of 12lb spring. When I interrupt the line turbo to Bc then bc to wastegate regardless bc closed all the way or opened all the way I have never ending boost. But I'm only using lower nipple to wg. Should I be running a T and like turbo to wg but in between those T into bc then other line or bc to top valve of wg? Because the way I ran was turbo to bc (no Tee) then bc 2nd nipple to bottom nipple on wg. So I'm thinking the routing was messed up that way.

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if you have boost to the moon then there is either:

A) the boost controller is either shut completely off and not allowing boost pressure to actuate the wastegate. (i suspect this one)
B) boost controller bleeds all the boost pressure so nothing is forced to actuate the wastegate.

either way the air pressure being generated by the turbo is not making its way to the wastegate to control it properly.

the way it works is easier seeing the lines with gauges on them
say the wastegate has a 10 psi spring in it a direct line will produce 10 psi
when you introduce a controller in it should bleed off some of that 10 psi tricking the wastegate to open when it produces 15 psi instead of 10 for example.

if the boost controller just restricts the flow from turbo to wastegate dont use it. it needs to bleed the pressure from the system.

finally if you do not understand how these work just bring it to someone who does. again you'll end up with a blown motor and blaming someone who told you not to fuck with it.

Yea im close to Smithfield NC , his shop is about 2 hours a little more away from me. My car is tuned at 26psi 532ish HP and it was done in Germany but like I said its 10 years old. The car runs very nicely so he said he will look over it, put it on the dyno and tweak some things if it needs it. here is the build list for mine.
Fully built motor bored over .2
Makes in the 530s on 26psi depending on octane.
Crowler Stage 2 cams
Borgwarner 256-rs turbo
Act 6 puck clutch
CAI (k &n)
Walboro fuel pump
Aeromotive Fuel Pressure Reg.
Fuel Return system
Catch Can
Transmission has the billet agp shift selector and extender.

Motor is built top and bottom
AGP head studs
Windage Tray
Balanced Crank
ATI harmonic balancer
Engine and trans mounts plus 4th mount
Bored intake
bomba Throttle Body
Bomba Fuel Rail
1000cc injectors
Aeromotive FPR
Fuel Return line
Braided clutch lines
Exhaust
2JZ metal PCV valve
MPX intercooler
Depo headlights
Aftermarket tail lights
Custom Headliner
Aftermarket Speakers
AFR, Scan and Oil Pressure Gauges (triple pod)

Wow that sounds great, definitely have more done than mine. She sounds like she is already nasty. Great mods I believe ours are close, however you have built lower so that alone Is .ore than me. I couldn't tell you what mines running. But if you only have a walbro 255 then we might be pretty close on hp as I don't think we can run e85 with that small of pump as I've been told anyways. I hope I will be around 500hp. I've been going thru and fixing everything I got it a few weeks ago it was a mess they couldn't afford to take care of it or do shit the right way I guess. So many broken bolts I had to remove and replace. I don't think mine is strong at all atm maybe 270s who knows honestly never had on dyno but I own a hellcat also and used to be dsm back in the day so I know my butt dyno don't tell me it's 500hp as I knew what that felt like on fwd and it don't feel that way. I would like him to change my rev limiter to maybe 6600 without bottom built hoping that will be safe. I'm not sure mine has ever had a dyno it's like old owner threw parts on it then when he got tired it just got passed along with people fuc#ing with it who don't know what they doing. I'm not sure what I will end up at honestly 56trim with almost 90ar I'm guessing the turbo size is close to the same as yours who knows. I'm keeping it 15psi until it gets tuned tho supposedly they said it was tuned on 17psi however it was only on external gate of 12psi no controller whatsoever so 15 to stay safe according to my afr guage. I would love to see yours. Mine is I consider under construction atm it needs body work. But I just did whole inside and now engine then will do exterior. Guess could call it sleeper as she ugly lol

Mines Def not ready for no car meets. I'm alot older now 42 but still like to have fun. I'm sure 1000cc injectors would work for e85 prob just need 340 or higher pump. Jeezis how u get 530+ with 93 pump gas? U might not need to tune it, and what dyno was that? 530 on pump is insane I wouldn't change it if that's what it is. Was that 3rd gear pull or something? I thought max of the 256rs turbo was around 550hp and that was including e85. Or at least meth too. Shit idk they came a long way since back in the day. Your trim is same as mine but I think if I'm not mistaking yours is around 1.2Ar as mines close to .9 I think yours is 4" to 2" or something like that can't remember. But the outlet is huge hot side. Maybe I'm mistaken again can't remember the older turbo specs like yours and mine. But if your over 530 on pump I'd like to be close to those numbers shit. Even 450 would feel great I have alot of weight reduction. Here and there. But then system and my 220lb ass. It's prob more than stock 😆

New2my04srt4 said:

Mines Def not ready for no car meets. I'm alot older now 42 but still like to have fun. I'm sure 1000cc injectors would work for e85 prob just need 340 or higher pump. Jeezis how u get 530+ with 93 pump gas? U might not need to tune it, and what dyno was that? 530 on pump is insane I wouldn't change it if that's what it is. Was that 3rd gear pull or something? I thought max of the 256rs turbo was around 550hp and that was including e85. Or at least meth too. Shit idk they came a long way since back in the day. Your trim is same as mine but I think if I'm not mistaking yours is around 1.2Ar as mines close to .9 I think yours is 4" to 2" or something like that can't remember. But the outlet is huge hot side. Maybe I'm mistaken again can't remember the older turbo specs like yours and mine. But if your over 530 on pump I'd like to be close to those numbers shit. Even 450 would feel great I have alot of weight reduction. Here and there. But then system and my 220lb ass. It's prob more than stock 😆

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lol yea im getting older been there done that with a lot of cars. I have the dyno sheet in my phone when I get off I can send it, It was built and dynoed in Germany when my buddy was deployed. IDK what kind of magic they did but definitely feels like its pulling that power. It does have a decent size fuel pump i believe is Walboro 450. He did say he dialed it down a few years ago so it could be close to 510s or so currently. I dont know much about this platform im still learning as well. Another reason why i want nigel to take a look at it and update the tune if it even needs it because like i said its running amazing right now lol but the build is old so im just taking precautions and want to make sure its all good which im sure it is , my friend takes care of his cars very well and it shows with this one. Ive only had for a few months now.