GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |

4.3L turbo is DONE! Now i need to figure out the boost spikes and A/F.

Thread Tools
 
Search this Thread
 
Old 08-04-2005 | 08:16 PM
  #21  
White05Denali's Avatar
Staging Lane
 
Joined: Jun 2005
Posts: 53
Likes: 0
From: Las Vegas
Default

Man i didn't know you didn't have any boost reference. I thought you just didn't have any sort of boost controller. Sorry i didn't comprehend that earlier....that's pretty basic stuff.

Running better now? Also just so you know.....those home made controllers from Home Depot will work but there are better alternatives for sure. It's a pretty lazy controller and won't help your spool all that much. Standard ball and spring. Look into a Hallman or something of that quality. I bet you pick up a few hundred rpm in spool over the Home Depot unit.
Old 08-04-2005 | 08:33 PM
  #22  
TURBHOE's Avatar
12 Second Truck Club
iTrader: (4)
 
Joined: Nov 2004
Posts: 6,318
Likes: 2
From: Jacksonville FL.
Default

right now he just wants the 4-5 psi so he is just going to hook up a boost line to the waste gate. and i don't see a boost controller help it get to 4-5psi when the controller would not even be turned on by then. i was just recommending a cheap alturnitive to a $100 controller that looks the same just painted. i don't understand how one can make it spool up faster than another unless its a better flowing and can send more pressure faster to the top of the waste gate to hold the spring completely closed and not alowing the valve to creep open. i guess maybe i just answered my question here though. either way he don't have a ton of money and i know i got mine for like $15-$20. and it looks like the same type as what i've seen in some of the sts pics i've seen. same mounting bracket and all.
Old 08-04-2005 | 08:39 PM
  #23  
TURBHOE's Avatar
12 Second Truck Club
iTrader: (4)
 
Joined: Nov 2004
Posts: 6,318
Likes: 2
From: Jacksonville FL.
Default

Originally Posted by JERRY2500
If it a manual shift you will need a BOV.
a manual shift still won't couse a pressure spike in the manifold becouse the throttle is closed. the bov is just to release pressure in the charge pipes so it doesn't back up to the turbo and slow it back down couse it to have to spool back up and take longer. and its good for long term effects of the turbo.
Old 08-04-2005 | 09:52 PM
  #24  
Thread Starter
TECH Junkie
 
Joined: Mar 2003
Posts: 3,271
Likes: 0
From: Katy, TX
Default

Originally Posted by 4.8T
a manual shift still won't couse a pressure spike in the manifold becouse the throttle is closed. the bov is just to release pressure in the charge pipes so it doesn't back up to the turbo and slow it back down couse it to have to spool back up and take longer. and its good for long term effects of the turbo.
And it helps prevent turbo bark which will destroy a turbo fast. A bov really isnt all that neccisary on low boost and auto.
Old 08-04-2005 | 10:13 PM
  #25  
TURBHOE's Avatar
12 Second Truck Club
iTrader: (4)
 
Joined: Nov 2004
Posts: 6,318
Likes: 2
From: Jacksonville FL.
Default

thats what i was trying for but i couldn't think of the "term".
Old 08-04-2005 | 11:10 PM
  #26  
duwem's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Nov 2004
Posts: 1,331
Likes: 0
From: Wisconsin
Default

Originally Posted by Snake Eater
And it helps prevent turbo bark which will destroy a turbo fast. A bov really isnt all that neccisary on low boost and auto.
sure it is, thats 1/4 the fun of having a turbo.....
Old 08-04-2005 | 11:13 PM
  #27  
TURBHOE's Avatar
12 Second Truck Club
iTrader: (4)
 
Joined: Nov 2004
Posts: 6,318
Likes: 2
From: Jacksonville FL.
Default

this is true.
Old 08-04-2005 | 11:23 PM
  #28  
parish8's Avatar
single digit dreamer
iTrader: (6)
 
Joined: Mar 2002
Posts: 9,743
Likes: 2
From: omaha ne
Default

did the boost line to the wg get your boost under control?
Old 08-04-2005 | 11:34 PM
  #29  
TURBHOE's Avatar
12 Second Truck Club
iTrader: (4)
 
Joined: Nov 2004
Posts: 6,318
Likes: 2
From: Jacksonville FL.
Default

yes that help the boost he is haveing problems with the maf poping a high input code at 4000 rpm at the same time it is falling on its face. and the take off from a sit still boggs bad until about 1500 i think he said when it starts building boost then it pulls harder and harder until 4000 where he gets his light and it falls but he said if he part throttles it it has the lag at take of then pulls good shift at 2500 and keep pulling good. oh and he said if he trys to brake stall it, it acts like it wants to die so he has to let out and let it catch up then get back into it. so??????????? any ideas your the tunning guy



one more thing i forgot the boost is good at 4-4.5 with a small quick 6 psi jump between shifts.
Old 08-04-2005 | 11:35 PM
  #30  
TURBHOE's Avatar
12 Second Truck Club
iTrader: (4)
 
Joined: Nov 2004
Posts: 6,318
Likes: 2
From: Jacksonville FL.
Default

he's in bed so i'll do my best to explain all i got from him so tommorrow when he gets up he can try out what ever you recomend and or think of.



All times are GMT -5. The time now is 12:46 AM.