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N75 plumbing

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9.6K views 11 replies 5 participants last post by  Paisleyman  
#1 ·
Yes it's me again my n75 plumbing on my mk12000 tt Ajq engine is not right the evap hose goes into the top of the n75 and the hose that should be on there is blanked off from the charge pipe...? I have previously posted on here to discuss and it was decided that the charge pipe hose attaches to the top of the n75 and the evap hose goes to the intake pipe but I don't have a small spigot free on the intake pipe so where the hell do I connect it...? I did suggest connecting the evap hose to the turbo actuator pipe from the n75 but not sure if this is right please help getting peed off
 
#2 ·
I have a bam so can only go off the diagrams i posted before. For now, try plugging the evap and connect the N75 to the charge pipe hose and see how it runs.
The evap being on the N75 is the same as it being plugged some of the time (low boost or vac)
Someone must have the same engine as you that could have a look.

Just had another search and it has to go to the intake before the turbo. Is there anything on the airbox?
 
#3 · (Edited by Moderator)
Green pipe, no throttle manifold at neg pressure the inlet manifold takes from the evap, when on boost the intake before the turbo takes from the evap.

Thats why there are 2 x 1 way valves in the system.

I think as yours is connected now your wastegate won't be working. There should be no pressure at the end of that evap pipe when on boost. (unless the 1 way valve is knackered or missing)
green.PNG
 

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#7 ·
I have checked air box and tip there is definitely not any extra inlets to connect to so what I've done is plug the evap Hose and connect the charge pipe hose to the n75 and it's got more boost, but i still think there should be more....I'll take it for a longer drive tomorrow and I'll let you know how it goes cheers
 
#10 · (Edited by Moderator)
Paisleyman said:
I have checked air box and tip there is definitely not any extra inlets to connect to so what I've done is plug the evap Hose and connect the charge pipe hose to the n75 and it's got more boost, but i still think there should be more....I'll take it for a longer drive tomorrow and I'll let you know how it goes cheers
Glad you've got some boost back but I still think your N75 is connected wrongly, the boost pipe & the actuator pipe need reversing as per my edited photo, yellow > yellow & red > red, plug blue evap pipe until you find it's home.

InkedWEIRD N75_LI.jpg

N75.jpg


You also seem to have an AGU head on your AJQ engine.

AGU EDIT.jpeg
 

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#11 ·
imartyn said:
Paisleyman said:
I have checked air box and tip there is definitely not any extra inlets to connect to so what I've done is plug the evap Hose and connect the charge pipe hose to the n75 and it's got more boost, but i still think there should be more....I'll take it for a longer drive tomorrow and I'll let you know how it goes cheers
Glad you've got some boost back but I still think your N75 is connected wrongly, the boost pipe & the actuator pipe need reversing as per my edited photo, yellow > yellow & red > red, plug blue evap pipe until you find it's home.

View attachment 2
View attachment 1

You also seem to have an AGU head on your AJQ engine.

Thats what he's done now, it's connected as you have sugested.
I am wondering if he has the wrong tip on it with no evap nipple. (don't actually know if they do one without but it's got to connect into it somewhere)