ls/vtec builds boost then backfires ans falls flat

Thread Tools
 
Search this Thread
 
Old Dec 3, 2009 | 10:07 AM
  #1  
sherwooddc2's Avatar
Thread Starter
New User
 
Joined: Dec 2009
Posts: 6
Likes: 0
From: Utica, Ohio
Default ls/vtec builds boost then backfires ans falls flat

she will build up about 8psi and after that it back fires and pretty much falls on its face. No software yet and stock map sensor. I think im dealing with map sensor problems but im not sure. any idea's?
Reply
Old Dec 3, 2009 | 10:13 AM
  #2  
kyden's Avatar
Honda-Tech Member
 
Joined: Feb 2001
Posts: 6,883
Likes: 4
From: CT
Default Re: ls/vtec builds boost then backfires ans falls flat

:facepalm:
Reply
Old Dec 3, 2009 | 10:18 AM
  #3  
sherwooddc2's Avatar
Thread Starter
New User
 
Joined: Dec 2009
Posts: 6
Likes: 0
From: Utica, Ohio
Default Re: ls/vtec builds boost then backfires ans falls flat

bro im new on here. I don't know what im doing. Can someone with some common curtesy help me out please
Reply
Old Dec 3, 2009 | 10:31 AM
  #4  
NonovUrbizniz's Avatar
Honda-Tech Member
20 Year Member
Liked
Loved
 
Joined: Jul 2002
Posts: 3,842
Likes: 72
Default Re: ls/vtec builds boost then backfires ans falls flat

Stop running your boosted engine without it being properly setup and fueled. PERIOD.

You're lucky if you didn't already blow rings or melt pistons.
Reply
Old Dec 3, 2009 | 10:39 AM
  #5  
Fo-Do Fanatic's Avatar
Honda-Tech Member
 
Joined: Oct 2006
Posts: 4,420
Likes: 1
From: Lovin the EF, Wa
Default Re: ls/vtec builds boost then backfires ans falls flat

You NEED some sort of engine management to make your car run flawlessly. What you need to do is take it to a reputable tuning shop, have them chip your ECU, run chrome/chrome pro, get it tuned then have fun. Until then, stop beating your damn untuned car or you'll have many more problems on your hands.
Reply
Old Dec 3, 2009 | 10:57 AM
  #6  
turbodailydan's Avatar
Honda-Tech Member
 
Joined: Mar 2009
Posts: 283
Likes: 0
Default Re: ls/vtec builds boost then backfires ans falls flat

Reply
Old Dec 3, 2009 | 11:25 AM
  #7  
azandford's Avatar
Honda-Tech Member
 
Joined: Oct 2009
Posts: 862
Likes: 0
Default Re: ls/vtec builds boost then backfires ans falls flat

Keep going untuned and your gonna blow something up
Reply
Old Dec 3, 2009 | 11:38 AM
  #8  
sherwooddc2's Avatar
Thread Starter
New User
 
Joined: Dec 2009
Posts: 6
Likes: 0
From: Utica, Ohio
Default Re: ls/vtec builds boost then backfires ans falls flat

tell me something i don't know. im looking for help you can give obiviously. i've driven it in the parking lot of my shop, thats it. ALL I NEED TO KNOW IS WHY ITS CUTTING OUT?
Reply
Old Dec 3, 2009 | 11:45 AM
  #9  
B6tPoweredMx3's Avatar
Honda-Tech Member
 
Joined: Sep 2004
Posts: 638
Likes: 0
From: Farmington, ny, USA
Default Re: ls/vtec builds boost then backfires ans falls flat

your building 8 lbs of boost on a stock ecu that has no idea what to do when it sees boost, and there for has no idea how much fuel or timing to add/subtract..
Sooo..
Reply
Old Dec 3, 2009 | 11:49 AM
  #10  
dc2luver's Avatar
Honda-Tech Member
 
Joined: Jun 2009
Posts: 130
Likes: 0
Default Re: ls/vtec builds boost then backfires ans falls flat

Bc your motor is not tuned for boost your stock map wouldnt even have enough fuel for the turbo. Get your ECU chipped and take it to get it tuned. You might want to check/change your plugs. Considering your car was backfiring.
Reply
Old Dec 3, 2009 | 11:51 AM
  #11  
sherwooddc2's Avatar
Thread Starter
New User
 
Joined: Dec 2009
Posts: 6
Likes: 0
From: Utica, Ohio
Default Re: ls/vtec builds boost then backfires ans falls flat

right thatk you. now, would a 3 bar map sensor help me out. it will read, and don't quote me 20psi(not that im trying to run 20psi) and adjust fuel and timing accordingly. yea or na?
Reply
Old Dec 3, 2009 | 11:57 AM
  #12  
sherwooddc2's Avatar
Thread Starter
New User
 
Joined: Dec 2009
Posts: 6
Likes: 0
From: Utica, Ohio
Default Re: ls/vtec builds boost then backfires ans falls flat

completly tuned up b4 boosting
Reply
Old Dec 3, 2009 | 12:07 PM
  #13  
hybrdthry911's Avatar
Honda-Tech Member
 
Joined: Dec 2008
Posts: 365
Likes: 0
Default Re: ls/vtec builds boost then backfires ans falls flat

Originally Posted by sherwooddc2
tell me something i don't know. im looking for help you can give obiviously. i've driven it in the parking lot of my shop, thats it. ALL I NEED TO KNOW IS WHY ITS CUTTING OUT?

are you kidding these people are trying to help you and you spit in their face?

the map sensor isnt the problem. it can read up to 11psi no problem. like someone stated above when the ecu sees positive pressure it has no idea what is going on, it has no values in its mapping for positive pressure so it just freaks out. a GM 3 bar will do nothing for you by itself.
Reply
Old Dec 3, 2009 | 12:16 PM
  #14  
sherwooddc2's Avatar
Thread Starter
New User
 
Joined: Dec 2009
Posts: 6
Likes: 0
From: Utica, Ohio
Default Re: ls/vtec builds boost then backfires ans falls flat

what you said was helpful. I wasnt "spiting in anyones face". Im trying to put a ruff tune on it by my self and everyone was saying the exact same thing!!! completly ignoring the direct question. yes I know I need to get get it tuned but I have seen plently of turbo hondas run strong with out a base map or tune.
Reply
Old Dec 3, 2009 | 01:29 PM
  #15  
B6tPoweredMx3's Avatar
Honda-Tech Member
 
Joined: Sep 2004
Posts: 638
Likes: 0
From: Farmington, ny, USA
Default Re: ls/vtec builds boost then backfires ans falls flat

A gm map sensor will do nothing for you, atleast throw an FMU on it if you have any intentions on this motor lasting longer than a 4th gear pull.
Reply
Old Dec 3, 2009 | 05:41 PM
  #16  
hybrdthry911's Avatar
Honda-Tech Member
 
Joined: Dec 2008
Posts: 365
Likes: 0
Default Re: ls/vtec builds boost then backfires ans falls flat

Originally Posted by sherwooddc2
what you said was helpful. I wasnt "spiting in anyones face". Im trying to put a ruff tune on it by my self and everyone was saying the exact same thing!!! completly ignoring the direct question. yes I know I need to get get it tuned but I have seen plently of turbo hondas run strong with out a base map or tune.
would love to see these fine specimens.
Reply
Old Dec 3, 2009 | 06:37 PM
  #17  
Fo-Do Fanatic's Avatar
Honda-Tech Member
 
Joined: Oct 2006
Posts: 4,420
Likes: 1
From: Lovin the EF, Wa
Default Re: ls/vtec builds boost then backfires ans falls flat

Originally Posted by Fo-Do Fanatic
You NEED some sort of engine management to make your car run flawlessly. What you need to do is take it to a reputable tuning shop, have them chip your ECU, run chrome/chrome pro, get it tuned then have fun. Until then, stop beating your damn untuned car or you'll have many more problems on your hands.
Like I said before, do this ^

Your ecu is used to and is tuned for no boost. When you start putting positive pressure to the ecu, it has NO idea wtf it should and shouldn't do. Whether to add or pull timeing/fuel. a 3bar map sensor will read up 35+psi but thats not going to put timing nor fuel in the correct manner it should be with a boosted car. When you start boosting your putting more air than your ecu is used to without adding fuel so it'll cut out and IT WILL fry ring(s) and/or a piston(s)...
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
blkdoutteg
Forced Induction
5
Aug 30, 2012 05:55 PM
shocker911
Hybrid / Engine Swaps
1
Apr 6, 2009 03:48 PM
D15Bbigred
Forced Induction
12
May 8, 2007 01:48 PM
rdssk8rcs1
Acura Integra
4
Oct 10, 2006 06:43 AM
Speed PHreak
Forced Induction
8
Feb 8, 2002 06:21 AM




All times are GMT -8. The time now is 04:59 PM.