s14 vacuum questions (bov, wastegate, boost gauge) where to put? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

zrs6v4 · 04-10-2012, 12:38 PM

Ok so I have been reading and reading online but I cant seem to find a simple or sufficient answer. I have an s14 sr20 engine swap on my 95 240sx. The swap was done without modifications therefore a stock sidemount was used. With that said the stock bov vacuum was in the stock location, the wastegate vacuum was in the stock location (connected to stock IC piping), and obviously no boost gauge stock.

I am putting a front mount intercooler (ISIS) on the car this week and I already have the battery relocated to the trunk but need to have the vacuums figured out so when it arrives I can get it done and ready to drive.

Here is a picture of the s14 SR20 throttle body with 4 usable vacuums I have to choose from to put my bov, wastegate, and boost gauge vacuums:
here is where all the hoses go stock.

1- to the stock bov
2-goes to the charcoal canister
3-stays blocked off stock
4- goes to charcoal canister
5-coolant to the TB for cold-idle adjustment (ignore)
6-goes to the idle-air control valve and should be put between the TB and the I/C (ignore)

With all that said I plan on putting my aftermarket bov (HKS) vacuum on the stock bov location which is #1 above in picture.

Wastegate: I have read this needs a boost source before the throttle plate so when the plate closes there will be no vacuum on the wastegate to cause it to not work properly. As I said above the stock source was in the stock sidemount piping but my new piping will not have a nipple in it for the wastegate. Many writeups say to simply have a nipple welded on the intercooler piping hotside. I really dont have the time to take this and have it done unless it is my only option. I do have 3 possible locations for the wastegate seen in the pic above (numbers 2-4, I used #1 for BOV).

Boost/Vacuum gauge: This, unlike the wastegate, does require a boost and vacuum source which will be one that is after the throttle plate so when it closes it will read vacuum.

My ultimate question is which of the 4 stock vacuum (again, see pic above for numbered 1-4) locations are the proper places to connect my bov, wastegate, and boost/vacuum gauge?

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04-10-2012, 12:38 PM	#1
zrs6v4 Join Date: Aug 2007 Location: St. Louis, MO Posts: 29 Trader Rating: (0) Feedback Score: 0 reviews	s14 vacuum questions (bov, wastegate, boost gauge) where to put? Ok so I have been reading and reading online but I cant seem to find a simple or sufficient answer. I have an s14 sr20 engine swap on my 95 240sx. The swap was done without modifications therefore a stock sidemount was used. With that said the stock bov vacuum was in the stock location, the wastegate vacuum was in the stock location (connected to stock IC piping), and obviously no boost gauge stock. I am putting a front mount intercooler (ISIS) on the car this week and I already have the battery relocated to the trunk but need to have the vacuums figured out so when it arrives I can get it done and ready to drive. Here is a picture of the s14 SR20 throttle body with 4 usable vacuums I have to choose from to put my bov, wastegate, and boost gauge vacuums: here is where all the hoses go stock. 1- to the stock bov 2-goes to the charcoal canister 3-stays blocked off stock 4- goes to charcoal canister 5-coolant to the TB for cold-idle adjustment (ignore) 6-goes to the idle-air control valve and should be put between the TB and the I/C (ignore) With all that said I plan on putting my aftermarket bov (HKS) vacuum on the stock bov location which is #1 above in picture. Wastegate: I have read this needs a boost source before the throttle plate so when the plate closes there will be no vacuum on the wastegate to cause it to not work properly. As I said above the stock source was in the stock sidemount piping but my new piping will not have a nipple in it for the wastegate. Many writeups say to simply have a nipple welded on the intercooler piping hotside. I really dont have the time to take this and have it done unless it is my only option. I do have 3 possible locations for the wastegate seen in the pic above (numbers 2-4, I used #1 for BOV). Boost/Vacuum gauge: This, unlike the wastegate, does require a boost and vacuum source which will be one that is after the throttle plate so when it closes it will read vacuum. My ultimate question is which of the 4 stock vacuum (again, see pic above for numbered 1-4) locations are the proper places to connect my bov, wastegate, and boost/vacuum gauge?