Car boosts what it feels

Ajehoti

Specialist
Nov 6, 2016
64
West Palm Beach, FL
I bought a 1 series off a person that had this setup that was terrible that I reversed. I put a jb4 in at the end of fixing all the others aspects of car. The car now boosts whatever it wants really. Before the fixing it had a turbosmart electronic boost controller and held 20. I put jb4 with a mac solenoid and followed the guide for it. Top port of wastegate to port 2 of mac solenoid and the port 1 side of mac goes to bottom port of wastegate that is tee'd to the compressor housing connection. No matter what I do I get the same results. So I'm lost for words because on the tial chart the biggest spring rate is 21.75.

Thanks
 
Last edited:

Sered

Private
Nov 5, 2016
42
Melbourne, FL
Gotcha. You mean that it's not limiting boost at all. So basically the wastegate is sticking shut.

Yeah the first step would be to get it to run of wg spring pressure. What spring do you have in there now?
 

Ajehoti

Specialist
Nov 6, 2016
64
West Palm Beach, FL
Gotcha. You mean that it's not limiting boost at all. So basically the wastegate is sticking shut.

Yeah the first step would be to get it to run of wg spring pressure. What spring do you have in there now?
That's the problem I don't know, bought the car like this. Car used to have a turbosmart electronic boost controller and held 20 but the setup was no where near ideal. So I will try replacing the lines first. If that doesn't work then I will run force gate pressure. Then if it still does the same thing I'm ordering a new tial MV-R and putting a 12 pound spring in it
 

Sered

Private
Nov 5, 2016
42
Melbourne, FL
Tials are rebuildable btw, so you shouldn't need a brand new one if it already has one.

It should have < a 20psi spring in it. Maybe take a pic of the hose routing? It sounds like zero pressure is getting to the bottom port on the gate. Meaning there's a major leak in the line coming from the compressor and T-ing off to the solenoid and the side WG port.

You have it routed like this right?
attachment.jpg
 
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Ajehoti

Specialist
Nov 6, 2016
64
West Palm Beach, FL
Yes it is routed like that, top port of gate to port 2 on the solenoid and port 1 of solenoid to compressor housing and bottom port of gate. I'm going to be replacing the lines. They looked fine to me but maybe something I'm not seeing.
 

08_335i

Sergeant
Nov 3, 2016
372
You said you're running jb4, make sure you activated backends (assuming that's what you're running for the single turbo) with menu option 4\2. also make sure you downloaded the single turbo firmware\hex to your jb4. then run a wastegate map (map 1) log and report back.
 
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Ajehoti

Specialist
Nov 6, 2016
64
West Palm Beach, FL
You said you're running jb4, make sure you activated backends (assuming that's what you're running for the single turbo) with menu option 4\2. also make sure you downloaded the single turbo firmware\hex to your jb4. then run a wastegate map (map 1) log and report back.
Everything is set accordingly, tomorrow I'm replacing all the lines. Will report back
 

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