Boost Issues

NeverBoneStck · 06-27-2019, 03:32 AM

Car has been constantly hitting 13lbs and just recently only hits 8-9 and starts to taper off between 5-6 rpm. Can anyone point me in the right direction boosted performance with comp turbo.

https://m.youtube.com/watch?v=gbVWBrZM9ug

TopgunZ · 06-27-2019, 08:10 AM

Are you on a boost controller or is it spring pressure only? It is most likely a boost leak somewhere but what it could be is your vacuum lines to your boost controller have a leak and they become non functional.

Also watch your AFR and stay out of boost. You are probably running pig rich and can cause all kinds of issues if you keep getting into boost.

Boosted Performance · 06-27-2019, 10:18 AM

Quote:

Originally Posted by NeverBoneStck

Car has been constantly hitting 13lbs and just recently only hits 8-9 and starts to taper off between 5-6 rpm. Can anyone point me in the right direction boosted performance with comp turbo.

https://m.youtube.com/watch?v=gbVWBrZM9ug

Replied to your PM.

NeverBoneStck · 06-27-2019, 11:12 AM

Have not hooked up my controller yet. It’s running off of spring pressure for the moment.

Jinxx · 06-27-2019, 02:05 PM

Quote:

Originally Posted by NeverBoneStck

Have not hooked up my controller yet. It’s running off of spring pressure for the moment.

It’s a boost leak ... check couplers at throttle bodies then work your way down the intake pipes till you get to turbo ... or you can have it smoke tested to locate it... also check the vacuum nipple on the driver side intake pipe .. the one in the bottom side .. I had mine rub and cut the vacuum line there and I was only getting 8 ish lbs

NeverBoneStck · 06-27-2019, 09:34 PM

So no leak. Could it be a spring issue. Waste gate starts to open at 6 lbs

phunk · 06-29-2019, 08:10 PM

Which wastegate spring are you using? You don’t have a 13psi spring in on a stock motor do you? I am wondering if instead of having a boost leak now, you had overboost before.

Jinxx · 06-29-2019, 09:23 PM

Do you remember the color of the spring ...yellow was the 7lbs spring ....and did you tune it at 13 lbs?

blak max · 07-08-2019, 03:44 PM

probably not your issue but for anyone who comes through..if you're experiencing boost sputter it could be incorrect spark plug gaps. i went to a shop to get valve covers fixed and i left with a sputter when i entered boost. it took me a while to find the cause bc i thought it was a boost leak somewhere.. while i had things apart i decided to check my gaps and to my surprise all of my spark plugs had magically changed to oem gaps (someone at the shop ). i brought them back to FI specs and the sputter went away.

NeverBoneStck · 07-08-2019, 09:09 PM

Forgot about this thread. I was using the yellow spring. Switched to the black and adjusted my boost controller. Everything is good

06-27-2019, 03:32 AM	#1 (permalink)
NeverBoneStck A True Z Fanatic Join Date: Oct 2009 Location: Beaverton, Or Posts: 1,110 Drives: 2008 G37 S Rep Power: 18	Boost Issues Car has been constantly hitting 13lbs and just recently only hits 8-9 and starts to taper off between 5-6 rpm. Can anyone point me in the right direction boosted performance with comp turbo. https://m.youtube.com/watch?v=gbVWBrZM9ug __________________ Juiced! That is all you need to know !! Last edited by NeverBoneStck; 06-27-2019 at 04:03 AM.

06-27-2019, 08:10 AM	#2 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	Are you on a boost controller or is it spring pressure only? It is most likely a boost leak somewhere but what it could be is your vacuum lines to your boost controller have a leak and they become non functional. Also watch your AFR and stay out of boost. You are probably running pig rich and can cause all kinds of issues if you keep getting into boost. wideglideleon likes this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM Last edited by TopgunZ; 06-27-2019 at 08:21 AM.

06-27-2019, 11:12 AM	#4 (permalink)
NeverBoneStck A True Z Fanatic Join Date: Oct 2009 Location: Beaverton, Or Posts: 1,110 Drives: 2008 G37 S Rep Power: 18	Have not hooked up my controller yet. It’s running off of spring pressure for the moment. __________________ Juiced! That is all you need to know !!

06-27-2019, 09:34 PM	#6 (permalink)
NeverBoneStck A True Z Fanatic Join Date: Oct 2009 Location: Beaverton, Or Posts: 1,110 Drives: 2008 G37 S Rep Power: 18	So no leak. Could it be a spring issue. Waste gate starts to open at 6 lbs __________________ Juiced! That is all you need to know !!

06-29-2019, 08:10 PM	#7 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	Which wastegate spring are you using? You don’t have a 13psi spring in on a stock motor do you? I am wondering if instead of having a boost leak now, you had overboost before. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

06-29-2019, 09:23 PM	#8 (permalink)
Jinxx Track Member Join Date: Dec 2015 Location: South Carolina Posts: 699 Drives: 2017 nismo 370z Rep Power: 3375	Do you remember the color of the spring ...yellow was the 7lbs spring ....and did you tune it at 13 lbs?

07-08-2019, 03:44 PM	#9 (permalink)
blak max Enthusiast Member Join Date: Apr 2014 Location: CFL Posts: 476 Drives: Ls swapped 370z Rep Power: 3369	probably not your issue but for anyone who comes through..if you're experiencing boost sputter it could be incorrect spark plug gaps. i went to a shop to get valve covers fixed and i left with a sputter when i entered boost. it took me a while to find the cause bc i thought it was a boost leak somewhere.. while i had things apart i decided to check my gaps and to my surprise all of my spark plugs had magically changed to oem gaps (someone at the shop ). i brought them back to FI specs and the sputter went away. Hotrodz likes this. __________________ LS 370Z ~ Fueled Racing ~ CSF radiator ~ Vis Racing ~ Braum Racing ~ SPLparts~ Vossen~Odessey Battery Last edited by blak max; 07-08-2019 at 10:26 PM.

07-08-2019, 09:09 PM	#10 (permalink)
NeverBoneStck A True Z Fanatic Join Date: Oct 2009 Location: Beaverton, Or Posts: 1,110 Drives: 2008 G37 S Rep Power: 18	Forgot about this thread. I was using the yellow spring. Switched to the black and adjusted my boost controller. Everything is good Ghostvette, Memphis370Z and redondoaveb like this. __________________ Juiced! That is all you need to know !!

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