370z Supercharger Boost Issues

DrBacon · 12-06-2021, 09:11 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, 10:55 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:

pkxu123 · 12-07-2021, 05:39 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, 09:12 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...

12-06-2021, 09:11 PM	#1 (permalink)
DrBacon Enthusiast Member Join Date: Nov 2016 Location: Washington Posts: 286 Drives: 2014 Nismo Rep Power: 27366	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.

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