Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk

Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


Reply
 
Thread Tools Display Modes
Old 12-15-2014, 10:32 AM   #1
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
SR overboosting but no power. HELP

my boost continues to build as I go higher in RPMs
even with this overboosting issue the car still pulls sluggish
I've changed the wastegate actuator and didn't help much

any ideas what could be my problem?
overdueBlaSiaN is offline   Reply With Quote
Sponsored Links
Old 12-15-2014, 10:51 AM   #2
bmxer882x
Zilvia Junkie
 
Join Date: Apr 2013
Location: chandler
Age: 30
Posts: 370
Trader Rating: (3)
bmxer882x is an unknown quantity at this point
Feedback Score: 3 reviews
Got a wideband? U could be going super rich or lean. Either would cause a huge loss in power.
bmxer882x is offline   Reply With Quote
Old 12-15-2014, 11:15 AM   #3
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by bmxer882x View Post
Got a wideband? U could be going super rich or lean. Either would cause a huge loss in power.
Thanks for the reply
No wideband
overdueBlaSiaN is offline   Reply With Quote
Old 12-15-2014, 11:18 AM   #4
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
My mods:
Walbro 255 fuel pump
HKS BOV
HKS wastegate actuator
Godspeed exhaust manifold
3inch circuit sports turbo elbow
Aluminum CX radiator
overdueBlaSiaN is offline   Reply With Quote
Old 12-15-2014, 05:46 PM   #5
silverarrow27
Zilvia FREAK!
 
Join Date: Oct 2005
Location: Banning, CA
Posts: 1,428
Trader Rating: (11)
silverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud ofsilverarrow27 has much to be proud of
Feedback Score: 11 reviews
What is considered "overboosting" for you?
__________________
1989 240sx XE|2002 Frontier SC CC LB 4wd|2011 Pathfinder LE V8 4wd
silverarrow27 is offline   Reply With Quote
Old 12-15-2014, 06:41 PM   #6
Kingtal0n
Post Whore!
 
Kingtal0n's Avatar
 
Join Date: Jul 2005
Location: South Florida
Age: 40
Posts: 4,827
Trader Rating: (17)
Kingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond repute
Feedback Score: 17 reviews
Send a message via AIM to Kingtal0n
Clogged cat? restriction somewhere it sounds like.

We need numbers. how much boost.

My immediate instruction to you is, disconnect the actuator so the engine doesn't boost at all anymore. Drive it like that for a while, see how it feels. If it still feels sluggish and slower than it should be, you have narrowed down your problem some. Do a boost leak check is next on the list.
Kingtal0n is offline   Reply With Quote
Old 12-15-2014, 07:18 PM   #7
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by Kingtal0n View Post
Clogged cat? restriction somewhere it sounds like.

We need numbers. how much boost.

My immediate instruction to you is, disconnect the actuator so the engine doesn't boost at all anymore. Drive it like that for a while, see how it feels. If it still feels sluggish and slower than it should be, you have narrowed down your problem some. Do a boost leak check is next on the list.
Boost used to stop at 7psi but just continues to climb

Update:
I drove the car to work today
Car didn't feel sluggish. Problem went away
So now my only problem is the overboosting issue

When you say unplug disconnect the actuator, do you mean take it out ? Or just unplug the vacuum line?

Also I don't have a cat
overdueBlaSiaN is offline   Reply With Quote
Old 12-15-2014, 07:41 PM   #8
bataangpinoy
Zilvia Addict
 
Join Date: Nov 2010
Location: caves
Age: 31
Posts: 860
Trader Rating: (7)
bataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymorebataangpinoy is not welcome here anymore
Feedback Score: 7 reviews
did you inspect the source line for the wastegate?
__________________
Quote:
Originally Posted by GTR-Garage
Handling, power and style must be in harmony.
bataangpinoy is offline   Reply With Quote
Old 12-15-2014, 08:05 PM   #9
frostie00
 
Join Date: Aug 2007
Location: Washington
Age: 40
Posts: 29
Trader Rating: (0)
frostie00 is an unknown quantity at this point
Feedback Score: 0 reviews
Do you have a manual boost controller?
frostie00 is offline   Reply With Quote
Old 12-15-2014, 11:12 PM   #10
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by bataangpinoy View Post
did you inspect the source line for the wastegate?
No I haven't but I know my line has a slight bend due to my cold pipe and Hotpipe being a tight fit. I'll try to fix that right now
overdueBlaSiaN is offline   Reply With Quote
Old 12-15-2014, 11:13 PM   #11
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by frostie00 View Post
Do you have a manual boost controller?
Yes I do
It's tee'd off to cold pipe and wastegate
overdueBlaSiaN is offline   Reply With Quote
Old 12-16-2014, 12:13 AM   #12
Dboyizmlg
Nissanaholic!
 
Dboyizmlg's Avatar
 
Join Date: Aug 2011
Location: SoCal (I.E.), San Berdino, Colton, Redlands
Posts: 1,675
Trader Rating: (18)
Dboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-known
Feedback Score: 18 reviews
Quote:
Originally Posted by overdueBlaSiaN View Post
Yes I do
It's tee'd off to cold pipe and wastegate
Lol, well that could be your issue right there.

You mentioned the turbo has HKS adjustable "actuator" correct?
This is what you do!
-take manual boost controller off
-run your vaccum hose from the actuator to the hotpipe
- check boost after this!

-if still over boost to like 13psi or so, then adjust the rod on the actuator a couple turns at a time to lower boost.

BTW just a heads up, those manual boost controllers are garbage.
Dboyizmlg is offline   Reply With Quote
Old 12-16-2014, 11:36 AM   #13
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by Dboyizmlg View Post
Lol, well that could be your issue right there.

You mentioned the turbo has HKS adjustable "actuator" correct?
This is what you do!
-take manual boost controller off
-run your vaccum hose from the actuator to the hotpipe
- check boost after this!

-if still over boost to like 13psi or so, then adjust the rod on the actuator a couple turns at a time to lower boost.

BTW just a heads up, those manual boost controllers are garbage.
My Hotpipe doesn't have a nipple to put a vacuum line on. Can I just use cold pipe?
I still have the stock SMIC but aftermarket cold pipe that has a nipple
overdueBlaSiaN is offline   Reply With Quote
Old 12-16-2014, 12:08 PM   #14
Dboyizmlg
Nissanaholic!
 
Dboyizmlg's Avatar
 
Join Date: Aug 2011
Location: SoCal (I.E.), San Berdino, Colton, Redlands
Posts: 1,675
Trader Rating: (18)
Dboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-known
Feedback Score: 18 reviews
^ yes you can still use cold pipe.
But.... It's recommended that the shorter the distance the better.
Either hotpipe, or compressor housing.

You should be ok with cold pipe for now though, later in the future you should get a quick tap fitting and drill it in the coupler, or nipple fitting on the hotpipe.
Dboyizmlg is offline   Reply With Quote
Old 12-16-2014, 12:11 PM   #15
Dboyizmlg
Nissanaholic!
 
Dboyizmlg's Avatar
 
Join Date: Aug 2011
Location: SoCal (I.E.), San Berdino, Colton, Redlands
Posts: 1,675
Trader Rating: (18)
Dboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-known
Feedback Score: 18 reviews
I have my quick tap fitting on the turbo outlet coupler.
Bought it for about $10.00 from FRSPORT.com
Dboyizmlg is offline   Reply With Quote
Old 12-16-2014, 03:28 PM   #16
overdueBlaSiaN
 
Join Date: Jul 2014
Location: Oceanside
Age: 30
Posts: 40
Trader Rating: (0)
overdueBlaSiaN is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by Dboyizmlg View Post
^ yes you can still use cold pipe.
But.... It's recommended that the shorter the distance the better.
Either hotpipe, or compressor housing.

You should be ok with cold pipe for now though, later in the future you should get a quick tap fitting and drill it in the coupler, or nipple fitting on the hotpipe.
Ok so I did what you said and now my boost is back to 7psi
Thanks you so much !!
overdueBlaSiaN is offline   Reply With Quote
Old 12-17-2014, 07:52 PM   #17
Dboyizmlg
Nissanaholic!
 
Dboyizmlg's Avatar
 
Join Date: Aug 2011
Location: SoCal (I.E.), San Berdino, Colton, Redlands
Posts: 1,675
Trader Rating: (18)
Dboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-knownDboyizmlg is making his/her stupidity well-known
Feedback Score: 18 reviews
Glad it worked out.
Dboyizmlg is offline   Reply With Quote
Old 12-17-2014, 09:23 PM   #18
Fuego
Zilvia Addict
 
Join Date: Nov 2011
Location: Las Vegas
Age: 34
Posts: 629
Trader Rating: (0)
Fuego is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by overdueBlaSiaN View Post
Ok so I did what you said and now my boost is back to 7psi
Thanks you so much !!
Set it to 11 and let it breathe like Nissan wanted it to.
__________________
Fuego is offline   Reply With Quote
Reply

Bookmarks

Tags
240, s13, sr20, sr20det


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -6. The time now is 05:37 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
vB.Sponsors
Copyright ? 1998 - 2022, Zilvia.net