Go Back  HomemadeTurbo - DIY Turbo Forum > Homemadeturbo > Engine Management
Boost creep & another avc-r question FREAKING HELP IM ANNOYED >

Boost creep & another avc-r question FREAKING HELP IM ANNOYED

Engine Management eCtune , Crome , AFC , FMU , Zdyne , Hondata , EMS , TE , Uberdata Anything to control your fuel, spark needs!

Boost creep & another avc-r question FREAKING HELP IM ANNOYED

Old 12-12-2005, 05:12 PM
  #1  
1.0 BAR
Thread Starter
 
Join Date: Sep 2005
Posts: 199
Default Boost creep & another avc-r question FREAKING HELP IM ANNOYED

Okay so I've been round and round with my car the past week or two. Some may remember I posted up about having apexi avc-r problems.. Well now if I have my boost controller set on (which is set to hold 10-11psi) I can hold the boost pretty well but the car hesitates/stumbles at WOT. Boosting non-wot causes the car to engine to cut pretty much completely. I spent last night soldering EVERY connection from my boost controller to the ecu and every other connection I could imagine. I had the cel scanned and had one code , p1127 fuel control (too rich). I turned my fpr back down and the boost back to 10psi (I raise fuel pressure to run 11psi which is when the code started). The cel is back on, hopefully just for the 2nd o2 sensor which is flapping in the breeze. Now, when I turn the boost controller off.... I should run set internal wastegate pressure which is 5psi. I run 5psi for a moment, the creep up to 8-10psi and it holds it?? Why? It is definitely creep as spike would hit x psi then drop back down, this holds it. Creep is usually caused by too much exhaust passing through the wastegate I believe.... I've heard of running to rich causing this. Also when the controller is off I can boost all day and not stumble/hesitate or nothing. WTF? Im am very unsure of what is going on at this point. I was thinking maybe I have a leak somewhere but I hold boost fine. Im going to pressure test the system anyway with the tester I designed. The apexi unit is accurate on every reading (rpm, speed, boost actuator voltage, TPS voltage etc). Nothing is out of spec so everything is working properly. I disconnected the solenoid that controls boost and turned off the unit. Sure enough I can blow right through the solenoid so its factory control. Turning it on makes it harder to blow through meaning the actuator is working properly. What the hell is going on here....

omgbossis21 is offline  
Old 12-12-2005, 06:09 PM
  #2  
1.0 BAR
Thread Starter
 
Join Date: Sep 2005
Posts: 199
Default Re: Boost creep & another avc-r question FREAKING HELP IM ANNOYED

oops, please move to forced induction
omgbossis21 is offline  
Old 12-13-2005, 11:45 AM
  #3  
0.0 BAR
 
Join Date: Feb 2003
Posts: 0
Default Re: Boost creep & another avc-r question FREAKING HELP IM ANNOYED

Originally Posted by omgbossis21
Okay so I've been round and round with my car the past week or two. Some may remember I posted up about having apexi avc-r problems..
You and 3/4ers of the people who own them. What makes you think you can fix it? It's obviously a defective design, since even when you get them to work right for ten seconds you have to go back and homosexually fiddle settings every time the ambient temperature or humidity changes.

Get a Turbo XS dual stage, and quit ------- around.

Originally Posted by omgbossis21
Well now if I have my boost controller set on (which is set to hold 10-11psi) I can hold the boost pretty well but the car hesitates/stumbles at WOT.
That doesn't sound like a boost controller problem - sounds like you're the 25% that got theirs to work correctly. Time to change plugs, or recheck AFRs, fuel pressure, ignition system, etc.


Originally Posted by omgbossis21
I had the cel scanned and had one code , p1127 fuel control (too rich). I turned my fpr back down and the boost back to 10psi (I raise fuel pressure to run 11psi which is when the code started). The cel is back on, hopefully just for the 2nd o2 sensor which is flapping in the breeze.
Being OBD2 is half your driveability problem. Short of Hyundaidata K-poop, there is no OBD2 Honduh tuning solution that is satisfactory.

The secondary O2 is just a pass/fail check, if it reads leaner than the primary you never get a CEL for it. Translation, if it's dangling in the air, you never get a CEL for it. P1127 is not a secondary O2 CEL.

Originally Posted by omgbossis21
Now, when I turn the boost controller off.... I should run set internal wastegate pressure which is 5psi. I run 5psi for a moment, the creep up to 8-10psi and it holds it?? Why? It is definitely creep as spike would hit x psi then drop back down, this holds it. Creep is usually caused by too much exhaust passing through the wastegate I believe....
Wrong way around. Creep is caused by not enough exhaust going out the wastegate... forcing the exhaust to go across the turbine, spooling the turbo up more, and raising boost levels.

What manifold/wastegate combo?

Originally Posted by omgbossis21
I've heard of running to rich causing this. Also when the controller is off I can boost all day and not stumble/hesitate or nothing. WTF?
Yeah, but at 8 psi, not 10. Sometimes it's a small difference between running correctly, and enough intake charge density to cause high speed glazed plugs to misfire.

Also, don't ASSume your system is free from leaks. I had a hole in my charge pipes the size of a quarter, and still spooled up and boosted pretty well, but you lose power. Double check the AVC-R vacuum connections on the solenoid, because if hooked up incorrectly it will cause a leak.

BTW, what the hell are you using to tune that thing? It might be half the problem.
Tom-Guy is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
TunerToys
Turbo Parts For Sale
16
10-01-2007 12:20 PM
92 4doorsleeper
Forced Induction
21
08-21-2006 08:11 PM
nonvtec
Hybrid/Tech
1
08-24-2004 09:01 AM
alwaystootall
Turbo Parts For Sale
3
07-30-2004 07:12 PM
superpilun
Forced Induction
3
10-10-2003 04:34 AM


Thread Tools
Search this Thread
Quick Reply: Boost creep & another avc-r question FREAKING HELP IM ANNOYED


Contact Us - Sitemap - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.