Not enough boost. - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Series Technical Discussions


Reply
 
Thread Tools
  #1  
Old August 25th, 2014, 08:20 AM
o2batsea's Avatar
o2batsea
Status: Offline
Bill Adams
66 109 sw 94 lwb
Member
 
Join Date: Jul 2009
Location: kensington md
Posts: 6,505
Registry
Not enough boost.

K, it looks like I'm only getting maybe 3 psi of boost. I suspect that I have a loose clamp somewhere that's letting all the pressure out. I double checked the waste gate and it has about 1/2 inch more or less of travel from slack to where it has to go on the pin.
__________________
Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old August 25th, 2014, 08:24 AM
NPT90's Avatar
NPT90
Status: Offline
JT
D90 ˇriginalÚ
Member
 
Join Date: Apr 2011
Location: DC/MD
Posts: 2,772
Registry
There are better ways but I've found that a compressor hooked up to the boost gauge hole can quickly help you locate the air leak (most of mine have been at the bottom of the intercooler because it shifts during install)
Reply With Quote
  #3  
Old August 25th, 2014, 08:48 AM
Jackie Treehorn's Avatar
Jackie Treehorn
Status: Offline
A
1985 (legitimately)
Member
 
Join Date: Jun 2011
Location: Massachusetts
Posts: 1,984
Registry
3lbs is pretty short on boost.
Split hose? (do you have the Terrafirma silicone hoses yet?)


I bet that if it were a confined area which was leaking (like through a loose or broken clamp) , you'd hear it whistling, but maybe the signal tube to the injector pump melted or cracked too so check those lines.


Hope its not a bum turbo.


EDIT: is it down on power (obviously its down from what it is normally because its lacking boost, but I mean pre-boost, off-the-line power)?
Could it be fuel starved, running lean for some reason? maybe injector pump issue? I'm just thinking that if you can't find a leak that maybe there is not enough combustion occurring to create the exhaust flow. That's my Jr. Associate stab at it, so I'll defer to Overlander or Uncle for better clarity.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old August 25th, 2014, 09:33 AM
o2batsea's Avatar
o2batsea
Status: Offline
Bill Adams
66 109 sw 94 lwb
Member
 
Join Date: Jul 2009
Location: kensington md
Posts: 6,505
Registry
Everything is brand spanking new. Ally tube and silicone elbows with t bolt clamps.
__________________
Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
Reply With Quote
  #5  
Old August 25th, 2014, 09:42 AM
the rover shop
Status: Offline
shayne young
89,93 & 95 camel trophy 110s 06 130
Member
 
Join Date: Sep 2011
Location: ft lauderdale florida
Posts: 5,225
Connect a pressure gauge to the waste gate valve and blow compressed air into the signal hose very slowly and see when the waste gate rod starts moving... If it moves at 3 psi then adjust it until you get the desired boost pressure...if it doesn't move until 8-10 then yes.. You have a leak somewhere..or the turbos not generating boost.. With the end of the hose where it goes onto the intake manifold you can remove that and hold your hand over it and give the engine a bit of a rev.. You will very quickly hear where the leak is if there is one..
Reply With Quote
  #6  
Old August 25th, 2014, 09:53 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,250
Registry
Shop vac blower side into the turbo inlet to look for leaks.

I assume you are driving it as you need load to get boost. What are smoke levels like. There needs to be excess fuel to get boost. If there is no smoke, something is not setup correct to get fuel in there.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #7  
Old August 25th, 2014, 09:59 AM
Jackie Treehorn's Avatar
Jackie Treehorn
Status: Offline
A
1985 (legitimately)
Member
 
Join Date: Jun 2011
Location: Massachusetts
Posts: 1,984
Registry
Quote:
Originally Posted by Red90 View Post
Shop vac blower side into the turbo inlet to look for leaks.

I assume you are driving it as you need load to get boost. What are smoke levels like. There needs to be excess fuel to get boost. If there is no smoke, something is not setup correct to get fuel in there.


This is sorta what I was thinking. Test for leaks, then move on to fueling, but since you're telling us things are brand new, maybe its one of the connections like Jason mentioned. Yes, that lower one can be a PITA. You'd think there's be more margin when hooking rubber hoses up, but with the ridged pipe on the bottom (feed to intercooler) and the small flange area, it can be tricky to line those up.




Shop vac is a good idea, I've used this as well. the shop vac hose is pretty damn close to the size of the plumbing.
Reply With Quote
  #8  
Old August 25th, 2014, 10:26 AM
Uncle Douglas's Avatar
Uncle Douglas
Status: Offline
Doug Crowther
A defender in every driveway-motto
D-90 Source Vendor
 
Join Date: Dec 2007
Location: Gods Country- Central Virginia
Posts: 11,841
Registry
Bill are you sure wastegate is seated/closed. Pulling the pressurized vacuum tube going to the wastegate will prevent it from opening and should allow you to test if that is the issue. Can you hear turbo whine, ie is it free and spinning ? From memory you have some pretty intricate boost side plumbing going on. Hopefully its just a leak, you can usually easily hear them when they are that major.
__________________
Good judgement comes from experience,experience comes from bad judgement.

Dividing Creek Imports
Worldwide Vehicle Shipment and Importation Service
Restoration & Modification work


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

410.693.1391


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
  #9  
Old August 25th, 2014, 10:53 AM
o2batsea's Avatar
o2batsea
Status: Offline
Bill Adams
66 109 sw 94 lwb
Member
 
Join Date: Jul 2009
Location: kensington md
Posts: 6,505
Registry
Yes Doug the wastegate is closing and moves freely. It could be that the boost gauge is not reading properly, that is to say, I don't have it set up correctly (Auber instruments boost gauge). I don't hear any leaks in the piping. I will test the wastegate actuator with compressed air. I will recheck that the turbo spins freely when I investigate all this again this weekend.
I would ultimately like to have you or someone take a look at it at Conclave.
__________________
Bill Adams

1966 109 5 door wagon 300Tdi "spermaceti fueled"
1994 RRC LeWiB "ruining the air behind me"
1968 2A 88

All my troubles are Rover
Reply With Quote
  #10  
Old August 25th, 2014, 11:51 AM
NPT90's Avatar
NPT90
Status: Offline
JT
D90 ˇriginalÚ
Member
 
Join Date: Apr 2011
Location: DC/MD
Posts: 2,772
Registry
Quote:
Originally Posted by Red90 View Post
Shop vac blower side into the turbo inlet to look for leaks.
Thats genius, I usually make a whole adapter at the hardware store for the air compressor... I've wasted hours of my life I can't get back...
Reply With Quote
  #11  
Old August 25th, 2014, 12:38 PM
Uncle Douglas's Avatar
Uncle Douglas
Status: Offline
Doug Crowther
A defender in every driveway-motto
D-90 Source Vendor
 
Join Date: Dec 2007
Location: Gods Country- Central Virginia
Posts: 11,841
Registry
Quote:
Originally Posted by o2batsea View Post
Yes Doug the wastegate is closing and moves freely. It could be that the boost gauge is not reading properly, that is to say, I don't have it set up correctly (Auber instruments boost gauge). I don't hear any leaks in the piping. I will test the wastegate actuator with compressed air. I will recheck that the turbo spins freely when I investigate all this again this weekend.
I would ultimately like to have you or someone take a look at it at Conclave.
Bill if it has any acceleration @ all and runs nicely @ highway speed I would suspect the gauge.
A 200 with no boost is a dog with less hp than a 2.5 natural.

If you rev the engine and can see the flex sections of intake pipe expanding you have boost.
__________________
Good judgement comes from experience,experience comes from bad judgement.

Dividing Creek Imports
Worldwide Vehicle Shipment and Importation Service
Restoration & Modification work


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

410.693.1391


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Series Technical Discussions

Tags
boost

Thread Tools

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
My garage doors are not high enough ADK46er Defender Technical Discussions 19 September 26th, 2011 03:58 AM
Not enough demand for NAS Defenders rover26c Misc. Chit-Chat 11 October 23rd, 2009 09:30 PM
door tops over tightened or not enough? atlawson Defender Technical Discussions 6 January 31st, 2008 09:00 PM
when the 90 is not tough enough 1000kva Misc. Chit-Chat 2 October 1st, 2007 12:27 AM
finally, fixed enough for photos januconn92 Misc. Chit-Chat 3 July 23rd, 2004 09:01 AM


All times are GMT -5. The time now is 03:33 AM.


Copyright