The R35 has two factory blow-off valves, left and right, and they return air to the intake. HKS makes a Super SQV4 that replaces the factory valve and one that goes with its intercooler piping. Turbosmart's SmartPort kit replaces both factory valves. We supply parts; your specialist fits them.
Recirculating or vent
HKS's R35 SQV4 kits return the air to the intake (suction) pipes, as the factory valves do. Turbosmart's SmartPort can recirculate or vent to atmosphere. Venting is a choice to make with your tuner, so ask before you change it. Our Skyline blow-off valve guide explains how the two types differ.
HKS Super SQV4 for the R35
| Part | HKS type | Choose it when |
|---|---|---|
| 71008-AN029 | Replacement type for the factory air bypass valve | You keep the factory pipework; it connects to the factory air bypass hose |
| 71008-AN027 | Chamber pipe exchange type | You fit the HKS intercooler piping kit 13002-AN003, which HKS says needs it |
| 13002-AN004 | Intercooler piping kit with SQV4 | You want the HKS piping and the SQV4 together in one kit |
HKS says the 71008-AN027 kit replaces the factory rubber hoses and cast pipes with polished aluminium pipes, and still returns the air to the suction pipes.
Super SQV4 71008-AN029 | Super SQV4 71008-AN027 | Intercooler piping kit 13002-AN003 | Intercooler piping kit with SQV4 13002-AN004
Turbosmart Dual Port SmartPort
Turbosmart's R35 kit has a left and a right valve made for the car, and they fit with the standard bolts and the supplied gaskets. It is a dual port valve: a supplied blanking plug sets it to full recirculation or to full vent to atmosphere. Vent mode needs extra parts, so ask your fitter which ones.
Turbosmart Dual Port SmartPort TS-0215-1027
Fitting
Turbosmart recommends that a suitably qualified technician fits and adjusts its valves, and that a boost gauge is permanently fitted. Have your specialist fit either make, and set it up with your tune.
Ordering
The HKS parts are price on application and are shipped from Japan. Imported parts usually take 1 to 2 weeks at the minimum. The Turbosmart kit shows its price on the part page. UK delivery is quoted before you pay. Email us or use the contact form with your car's details and any intercooler piping it has.
Delivery and returns | R35 turbo parts | HKS | Turbosmart
Related guides
R35 GT-R wastegate actuators | R35 GT-R stage 1, 2 and 3 | Skyline blow-off valve choice
FAQ
Do I need upgraded blow-off valves on a tuned R35?
Not always, so ask your tuner. You do need HKS's chamber pipe SQV4, 71008-AN027, if you fit the HKS intercooler piping kit 13002-AN003, because HKS says the kit needs it. Otherwise HKS's replacement type and Turbosmart's SmartPort both replace the factory valves and can keep the air returning to the intake.
Which HKS SQV4 fits my R35?
It depends on your pipework. 71008-AN029 replaces the factory air bypass valve and connects to the factory air bypass hose. 71008-AN027 is the chamber pipe type for HKS's intercooler piping 13002-AN003. The 13002-AN004 piping kit already includes an SQV4, so you don't buy one separately with it.
Can an R35 blow-off valve vent to atmosphere?
Turbosmart's Dual Port SmartPort can. Its supplied blanking plug sets it to full recirculation or full vent to atmosphere, and vent mode needs extra parts your fitter can advise on. HKS's R35 SQV4 kits keep a suction return to the intake. Venting is a choice to make with your tuner, so ask before you change it.
What comes in the Turbosmart SmartPort R35 kit?
Turbosmart lists a left and a right valve made for the R35, two port blanking plugs, two gaskets, four hose clamps and two lengths of vacuum line. The valves fit with the standard bolts. Turbosmart recommends that a qualified technician fits and adjusts them, and that a boost gauge is permanently fitted.