I’m new to forums in general and would love if someone can help me figure a few questions out. If not please send me in the right direction. I bought
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09-29-2022, 02:36 AM | #1 (permalink) |
Base Member
Join Date: Jul 2022
Location: Canada
Posts: 7
Drives: 2011 370z
Rep Power: 3 |
Hello all new Z owner from Canada
I’m new to forums in general and would love if someone can help me figure a few questions out. If not please send me in the right direction. I bought a 2011 370z 6mt has a GMT supercharger kits along with all supporting mods.
The SC kit is their stage 2 with rotex c38-91. My question is about boost pressure. My gauge shows good vac at idle and wide open near redline shows around 4psi. Is that normal or is that low ? I’m the case that is low suggestions why that would be so I can work on it. I have don’t countless hours of searching and reading but the only thing I can figure is changing pully size. Hope someone can help and thanks |
09-29-2022, 08:25 AM | #2 (permalink) | |
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Join Date: May 2018
Location: Rhode Island
Posts: 478
Drives: '09 370Z, '03 G35
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Hello all new Z owner from Canada
Quote:
That’s low. Either the belt is slipping so the supercharger isn’t generating boost or the boost is escaping via a boost leak. No supercharger kit for this car would come with a pulley that only makes 4psi. Or your gauge is broken. Is this an aftermarket in-car boost gauge or are you reading from the ECU? Sent from my iPhone using Tapatalk
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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes Last edited by Averying; 09-29-2022 at 08:31 AM. |
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09-29-2022, 08:26 PM | #3 (permalink) |
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Join Date: Jul 2022
Location: Canada
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Drives: 2011 370z
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I agree it does seem low. I am reading off an aftermarket defi vac/boost gauge. So far I have only tried the spray and pray method to try and find a possible vac leak. My next suspect is the belt as well. The car only has 9000km on it since the kit was installed so my initial thoughts were probably not the belt.
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09-30-2022, 09:45 AM | #4 (permalink) | |
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Join Date: May 2018
Location: Rhode Island
Posts: 478
Drives: '09 370Z, '03 G35
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Quote:
Another thing to check is your bypass valve. If the bypass valve is not fully closing, you’re just venting off boost. rebuilding the bypass valve is cheap/easy if that is the case. Sent from my iPhone using Tapatalk
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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes |
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09-30-2022, 12:00 PM | #5 (permalink) |
Base Member
Join Date: Jul 2022
Location: Canada
Posts: 7
Drives: 2011 370z
Rep Power: 3 |
That is todays project and hopefully that answers some questions. I did find a YouTube video of a yellow z doing a dyno pull with the same setup. That car was running 4.5psi of boost and made 400hp at the wheels. The is nothing for information there and the video is 12 years old. So I’m curious to know why it was setup like that when I have seen countless other pieces of information which say it should make 500-500 at the wheels. My car is running rich so I am also going to swap the spark plugs with GTR plugs and see if that helps. The nearest tuner is 3hrs away so I am going to do what I can before taking it there.
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09-30-2022, 11:11 PM | #6 (permalink) | |
Enthusiast Member
Join Date: May 2018
Location: Rhode Island
Posts: 478
Drives: '09 370Z, '03 G35
Rep Power: 14419 |
Quote:
The GTM stage 1 kit made ~8psi boost. The stage 1.5 and stage 2 should make more than that. If you’re truly making only 4psi you have a problem. Sent from my iPhone using Tapatalk
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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes |
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10-01-2022, 08:37 PM | #7 (permalink) |
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Join Date: Jul 2022
Location: Canada
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Drives: 2011 370z
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I discovered my BOV was not closing. I have since cleaned and oiled it and am now marking 7psi of boost. I still have to adjust it a bit but it’s working much better then before. I just bought the car so it’s taken a bit of time to go through things and try to see what and how things have been modified. The car is still running very rich though. I appreciate the help and any advice.
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10-02-2022, 02:22 PM | #8 (permalink) | |
Enthusiast Member
Join Date: May 2018
Location: Rhode Island
Posts: 478
Drives: '09 370Z, '03 G35
Rep Power: 14419 |
Quote:
I’d also recommend a BOV rebuild kit with new orings. Wouldn’t hurt. Pretty sure the stage 2 kit should easily make over 10psi of boost Sent from my iPhone using Tapatalk
__________________
2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes |
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02-01-2023, 04:47 PM | #9 (permalink) | |
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Quote:
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