Single Turbo RX-7's Questions about all aspects of single turbo setups.

low boost

Thread Tools
 
Search this Thread
 
Old 12-20-08, 06:58 AM
  #1  
Rotary Freak

Thread Starter
iTrader: (5)
 
Johny zoom's Avatar
 
Join Date: Jun 2002
Location: Va
Posts: 1,549
Likes: 0
Received 0 Likes on 0 Posts
low boost

Now that My engine is broken-in I want to start turning the boost up. It seems I can only boost about 7 PSI. I replace dthe BOV with a syncronic, ( I love this thing) . I took of the waste gate to be sure the seat was OK.and it was

It is a aspec T3 35R REW with all supporting mods. The turbo spins freely and continues even after the engine is shut down. I even took off the waste gate vacuum hose and still only boosted 7PSI.

Do I just have a major boost leak? Or could it be something wrong with the turbo?

Johny
Old 12-20-08, 07:04 AM
  #2  
Rotary Freak

Thread Starter
iTrader: (5)
 
Johny zoom's Avatar
 
Join Date: Jun 2002
Location: Va
Posts: 1,549
Likes: 0
Received 0 Likes on 0 Posts
Oh. its in a FC and has no emissions, solenoids, check valves or anything else, The boost controller is an e-boost IT has always worked fine.
Old 12-20-08, 09:53 AM
  #3  
Rotary Freak

Thread Starter
iTrader: (5)
 
Johny zoom's Avatar
 
Join Date: Jun 2002
Location: Va
Posts: 1,549
Likes: 0
Received 0 Likes on 0 Posts
I haven't pressureized the system but all the couplers are tight

Anyone
Old 12-20-08, 07:19 PM
  #4  
wannaspeed.com

iTrader: (23)
 
Dudemaaanownsanrx7's Avatar
 
Join Date: Feb 2003
Location: Texas
Posts: 2,802
Likes: 0
Received 5 Likes on 5 Posts
How quickly do you get 7 psi? With a gt35r t3 you should see that boost level by at least 3k. It sounds like you either have a large boost leak. Which testing with a boost pressure tester is the easiest and simplest method. Or your wastegate is not sealing.
Old 12-20-08, 07:35 PM
  #5  
Just in time to die

iTrader: (1)
 
Zero R's Avatar
 
Join Date: Nov 2001
Location: look behind you
Posts: 4,143
Likes: 0
Received 1 Like on 1 Post
You either have a boost leak, a pre turbo leak (would feel excessively laggy) or a 7psi spring. Have you checked your wg spring? Also I never made a T3 35R kit for the FC so..... just curious what you have.
Old 12-20-08, 09:38 PM
  #6  
wannaspeed.com

iTrader: (23)
 
Dudemaaanownsanrx7's Avatar
 
Join Date: Feb 2003
Location: Texas
Posts: 2,802
Likes: 0
Received 5 Likes on 5 Posts
He said even when disconnecting the line the to the wastegate it still didn't boost higher so its prob not the spring weight
Old 12-20-08, 10:43 PM
  #7  
rotorhead

iTrader: (3)
 
arghx's Avatar
 
Join Date: Aug 2004
Location: cold
Posts: 16,182
Received 429 Likes on 263 Posts
^^ he has an REW swap.

i would be really surprised if you could keep boost that low (7psi) if everything were working right, considering how prone these cars are to boost creep.
Old 12-21-08, 02:12 AM
  #8  
Rotary Freak

Thread Starter
iTrader: (5)
 
Johny zoom's Avatar
 
Join Date: Jun 2002
Location: Va
Posts: 1,549
Likes: 0
Received 0 Likes on 0 Posts
very laggy, but Im still untuned very rich also pulls strong. I always start major and work backwards so is there possibly something wrong with the turbo?

PIC
Attached Thumbnails low boost-water-2-air.jpg   low boost-cv-dyno-pic1.jpg  
Old 12-22-08, 08:53 PM
  #9  
Just in time to die

iTrader: (1)
 
Zero R's Avatar
 
Join Date: Nov 2001
Location: look behind you
Posts: 4,143
Likes: 0
Received 1 Like on 1 Post
I would be surprised if it was the turbo. Check your WG, pull it apart make sure it's all good in there.
Old 12-22-08, 09:35 PM
  #10  
Just turn up the boost!
iTrader: (1)
 
ZAN_TUNING's Avatar
 
Join Date: Jul 2007
Location: HELL
Posts: 662
Likes: 0
Received 0 Likes on 0 Posts
I had this issue a long time ago on a customer car... turned out he had a clogged "high flow" cat in the exhaust. Took it out and all was well.
Old 12-23-08, 03:51 PM
  #11  
Rotary Freak

Thread Starter
iTrader: (5)
 
Johny zoom's Avatar
 
Join Date: Jun 2002
Location: Va
Posts: 1,549
Likes: 0
Received 0 Likes on 0 Posts
I have no cats I also took apart the waste gate I have a syrncronic wastegate coming to be sure.
Sean do you have a t3 1.06 in stock? PM me if you like
Old 12-23-08, 05:07 PM
  #12  
Just turn up the boost!
iTrader: (1)
 
ZAN_TUNING's Avatar
 
Join Date: Jul 2007
Location: HELL
Posts: 662
Likes: 0
Received 0 Likes on 0 Posts
no rags were left in the i/c piping last time you worked on it?
Old 12-23-08, 05:37 PM
  #13  
Just in time to die

iTrader: (1)
 
Zero R's Avatar
 
Join Date: Nov 2001
Location: look behind you
Posts: 4,143
Likes: 0
Received 1 Like on 1 Post
PM'd
Old 12-23-08, 06:40 PM
  #14  
Chasing numbers

iTrader: (5)
 
sk8world's Avatar
 
Join Date: Apr 2001
Location: Alabama
Posts: 5,097
Likes: 0
Received 4 Likes on 3 Posts
what thermostat housing is that?
Old 12-26-08, 02:02 PM
  #15  
Never Finished

iTrader: (10)
 
Dustinali's Avatar
 
Join Date: Oct 2006
Location: Huntsville AL
Posts: 415
Likes: 0
Received 0 Likes on 0 Posts
Hes running the second gen front cover and second gen waterpump housing on the rew block.
Old 12-26-08, 02:14 PM
  #16  
Rotary Freak

Thread Starter
iTrader: (5)
 
Johny zoom's Avatar
 
Join Date: Jun 2002
Location: Va
Posts: 1,549
Likes: 0
Received 0 Likes on 0 Posts
Thanks dustin Maybe the wastegate Im gettin from you will fix the prob
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rgordon1979
3rd Generation Specific (1993-2002)
40
03-15-22 12:04 PM
dkwasherexd
Single Turbo RX-7's
21
05-27-17 04:51 AM
AXA
Single Turbo RX-7's
8
09-05-15 10:06 AM
gabescanlon
3rd Generation Specific (1993-2002)
7
09-05-15 12:09 AM



Quick Reply: low boost



All times are GMT -5. The time now is 01:42 PM.