370z Supercharger Boost Issues

pkxu123 · 12-06-2021, 08:16 AM

Greetings from Australia...

My 2017 manual 370z is currently at a reputable shop in Australia getting the stillen supercharger kit with a custom air to air cooler. The shop installed and tuned my car but they keep running into issues after issues.

My current mod list:

Invidia Gemini CBE
Invidia HFC
Radium Surge Tank
460 LPH & 1050CC Injectors
Custom A2A FMIC
Turbosmart BOV
Custom air intake
Flex fuel kit
Map & Air Temp sensor
Stillen Supercharger
9lbs pulley upgrade

And not to mention the supporting mods... ie.. clutch, oil cooler

The car is tuned using ECUTEK and it made 270rwkw (362HP) on 98 and 308rwkw (413HP) on E85 with 5.5 psi boost, something is obviously not right and the tuner doesn't know what the problem is. They claim they have done the most forced induction 370z in whole of Australia.

The shop custom fabricated the air intake setup.

After some research and digging, they have tuned a stock stillen supercharger which made 283.7rwkw.... YES.... a STOCK stillen supercharger... After pulling up some previously tuned stillen sc cars in Australia, mine seems to be one of the LOWEST stillen supercharger in Australia, even with the A2A setup.

The car has been sitting at their shop for 1 whole month.

I am desperately seeking for advice

sirnixalot · 12-06-2021, 08:24 AM

Have they done a boost leak test?

Do you have a plot of the boost curve?

Are the belt's properly tensioned?

pkxu123 · 12-06-2021, 08:26 AM

Quote:

Originally Posted by sirnixalot

Have they done a boost leak test?

Do you have a plot of the boost curve?

Are the belt's properly tensioned?

They said they've checked for boost leak but no leak

I'm going there tomorrow. Will ask about the belt tensioner.
They haven't sent me the dyno graph as they are "too busy"

FrankEtier · 12-06-2021, 01:07 PM

BOV setup correctly? What is the peak boost?

pkxu123 · 12-06-2021, 03:16 PM

Quote:

Originally Posted by FrankEtier

BOV setup correctly? What is the peak boost?

Supposedly so.

They said peak boost is 5.5. Will ask for dyno sheet

ByThaBay · 12-06-2021, 07:35 PM

Quote:

Originally Posted by pkxu123

Supposedly so.

They said peak boost is 5.5. Will ask for dyno sheet

I tune a lot of these kits for Aaron and we haven't seen that issue yet. If you reach out to me I can look into it for you. I'll need logs and possibly additional photos. You can PM me for additional contact info.

FrankEtier · 12-06-2021, 09:07 PM

Quote:

Originally Posted by ByThaBay

I tune a lot of these kits for Aaron and we haven't seen that issue yet. If you reach out to me I can look into it for you. I'll need logs and possibly additional photos. You can PM me for additional contact info.

^Call this guy for sure!

DrBacon · 12-06-2021, 10:11 PM

Off the top of my head there's 3 things you should do/check first:

Temporarily take off your intake to ensure that's not the issue
Get the subaru timing belt idler pulley for extra serp belt tension
Measure your jackshaft and supercharger pulleys to ensure they're correctly sized

Optimiser · 12-06-2021, 11:55 PM

Quote:

Originally Posted by DrBacon

Off the top of my head there's 3 things you should do/check first:

Temporarily take off your intake to ensure that's not the issue
Get the subaru timing belt idler pulley for extra serp belt tension
Measure your jackshaft and supercharger pulleys to ensure they're correctly sized

Defintely this: Get the subaru timing belt idler pulley for extra serp belt tension!
Something like this:

HapaZ · 12-07-2021, 12:30 AM

Doesn’t the silicone on the intake like to collapse and pinch off boost to around 6lbs?

Optimiser · 12-07-2021, 01:10 AM

Quote:

Originally Posted by HapaZ

Doesn’t the silicone on the intake like to collapse and pinch off boost to around 6lbs?

That's true. He might need the metal cast one like mine which definitely avoids this, although I didn't get as low boost when I had my silicon one.

Optimiser · 12-07-2021, 01:29 AM

Another thing to consider using are high traction pulley(s)

https://vortechsuperchargers.com/pro...ant=7811182081

pkxu123 · 12-07-2021, 06:39 AM

Update on post...

The shop unfortunatly are not able to work on it. They said they have tried a lot of different belts, different tensioners but they have no idea what's going on. Since the kit is a used kit and it's a custom FMIC, they suspect its something wrong with the either one.

They gave me the ethanol dyno sheet as they had it printed but didn't supply me one for 98. It loses boost at around 6500rpm. It makes peak boost before red line. From my research, it sounds like belt slippage to me but the tuner/shop was adamant that they have tried everything possible...

They're unfortunately handing the car back like this as they don't have time to diagnose further. They said that if they do, they'd have to charge for every single minute. This shop is one of the more expensive shops in Australia and the build is already pushing my budget.

Quote:

Originally Posted by Optimiser

Defintely this: Get the subaru timing belt idler pulley for extra serp belt tension!
Something like this:

Thanks for this, I actually mentioned your car to them after reading about your informative posts on this forum (your car was done at the same shop). I brought up the fact that your W2A supercharger back then made more power than my current a2a supercharger... shame.

Quote:

Originally Posted by ByThaBay

I tune a lot of these kits for Aaron and we haven't seen that issue yet. If you reach out to me I can look into it for you. I'll need logs and possibly additional photos. You can PM me for additional contact info.

I will definitely hit you up once I get my car back...

JVerge5363 · 12-12-2021, 10:12 PM

I'll be upgrading to TopgunZ's new Rotrex Kit so I'll be selling my ACE Kit in which I made 543 whp at 14psi and 423 tq

Quote:

Originally Posted by pkxu123

Update on post...
The shop unfortunatly are not able to work on it. They said they have tried a lot of different belts, different tensioners but they have no idea what's going on. Since the kit is a used kit and it's a custom FMIC, they suspect its something wrong with the either one.

They gave me the ethanol dyno sheet as they had it printed but didn't supply me one for 98. It loses boost at around 6500rpm. It makes peak boost before red line. From my research, it sounds like belt slippage to me but the tuner/shop was adamant that they have tried everything possible...

They're unfortunately handing the car back like this as they don't have time to diagnose further. They said that if they do, they'd have to charge for every single minute. This shop is one of the more expensive shops in Australia and the build is already pushing my budget.

Thanks for this, I actually mentioned your car to them after reading about your informative posts on this forum (your car was done at the same shop). I brought up the fact that your W2A supercharger back then made more power than my current a2a supercharger... shame.

I will definitely hit you up once I get my car back...

370zMelb · 01-02-2022, 08:21 PM

Have you gotten your car back? How did you go?

12-06-2021, 08:24 AM	#2 (permalink)
sirnixalot Track Member Join Date: May 2017 Location: Cayman Islands Posts: 685 Drives: 2010 370Z Rep Power: 57454	Have they done a boost leak test? Do you have a plot of the boost curve? Are the belt's properly tensioned? __________________ 2010 Sport - LS3 swap loading 2012 Frontier - BTWTuning VK56DE swap

12-06-2021, 01:07 PM	#4 (permalink)
FrankEtier Base Member Join Date: Jul 2019 Location: McKinney, TX Age: 49 Posts: 145 Drives: 2014 370Z SC Rep Power: 11605	BOV setup correctly? What is the peak boost? __________________ ‘14 Topgunz Speedworks Rotrex Supercharged VR30 7AT 370Z Magma Red. @liquid.magma

12-06-2021, 10:11 PM	#8 (permalink)
DrBacon Enthusiast Member Join Date: Nov 2016 Location: Washington Posts: 285 Drives: 2014 Nismo Rep Power: 27365	Off the top of my head there's 3 things you should do/check first: Temporarily take off your intake to ensure that's not the issue Get the subaru timing belt idler pulley for extra serp belt tension Measure your jackshaft and supercharger pulleys to ensure they're correctly sized Optimiser likes this.

12-07-2021, 12:30 AM	#10 (permalink)
HapaZ Base Member Join Date: Sep 2014 Location: NorCal Posts: 245 Drives: 2012 370z Base Coupe Rep Power: 11	Doesn’t the silicone on the intake like to collapse and pinch off boost to around 6lbs? Optimiser likes this.

01-02-2022, 08:21 PM	#15 (permalink)
370zMelb Base Member Join Date: Dec 2021 Location: Melbourne Posts: 3 Drives: Nissan 370z MY12 Rep Power: 4	Have you gotten your car back? How did you go? Optimiser likes this.

12-07-2021, 01:29 AM	#12 (permalink)
Optimiser Enthusiast Member Join Date: Mar 2013 Location: Australia Posts: 455 Drives: 2012 Nissan 370Z MT Rep Power: 20144	Another thing to consider using are high traction pulley(s) https://vortechsuperchargers.com/pro...ant=7811182081

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