Boost Gauge Install for Defender TD5

[davisshannon]

Hi,

Can anyone provide any instructions for fitting a boost gauge to a Defender TD5?

My Defender 90 sometimes acts very sluggishly during acceleration. I have recently installed a tacho, and this behaviour happens anywhere from 1500+ RPMs. This should be when the turbo kicks in, but it looks like something is going on. The dealer said that they couldn't find anything wrong with it on multiple visits, but I still know something is wrong. It can take a couple of seconds or more of pressing the accelerator for the car to respond. One drive it is fine, and the next it feels completely different. It really seems like a boost issue, and I feel that the gauge is going to be my only help in diagnosing this.

Thanks

[DEFENDERZOOK]

<span style="color:blue">does this happen between gear changes.......?</span>

[davisshannon]

No, it happens in any gear. For example, I'll be sitting in 4th and try to accelerate from 50kph. It just sits there and waits, then decides to start going. When it happens, it feels like something is holding the vehicle back and then let's it go.

[DEFENDERZOOK]

<span style="color:blue">check the hose from ecu hasnt fallen off.......
i had mine fall off and had similar problems......it is held on only by a hose
clamp and hasnt much room to grip....


this is the big hose from the turbo i am talking about......</span>

[davisshannon]

Thanks. I was taking a look at the turbo earlier, but don't remember the hose you are talking about. Is it a rubber hose, or would it be a metal pipe? I'll go take a look again and see if I can find it. Does it come out the back of the turbo?

[siegucci]

Boost gauge installation:
There is a small rubber hose between the intercooler hose and the turbo wastegate. Fit a T-piece in that hose and connect it to your gauge.

About your driving issue: Check the rubber hose going to the lid of your airfilterbox on the left hand side of the box(left=sitting behind the steering wheel facing the front of the car) and make shur that hose is not kinked or jammed somewhere.
This is your EGR dump pipe. If it is jammed or kinked the EGR valve stays open for a while and gives you exact the same sympton.

[disconut]

http://jeep.cfasp.de/upload/31396.jpg

My boost gauge installed.

Trev.

[davisshannon]

Thanks for the install directions. I ended up finding that tube last night and figured that's where I'd have to tap into.

I'll check the EGR dump pipe and see if that is the culprit. I've checked all of the other hoses, pipes, and connections and they are connected properly with no holes or other signs of wear.

If the EGR tube is obstructed will it affect boost pressure, or will it just affect turbo performance? Just wondering in case I get the gauge installed and I don't notice any adverse boost issues when the problem arises.

Thanks

[sclarke]

Originally posted by disconut
http://jeep.cfasp.de/upload/31396.jpg

My boost gauge installed.

Trev.

Where is your Gas Gauge now???

[DEFENDERZOOK]

<span style="color:blue">under the dash to the right of the steering column....
neat job too.....
</span>

[disconut]

http://jeep.cfasp.de/upload/31557.jpg

Just extended the wiring. Gauge is visible from the seated position.
Not something I stare at all the time as I run by kilometres travelled.
450 to 480 between fills. I can get 520 klms.

Trev.

[DEFENDERZOOK]

<span style="color:blue">how many litres per hundred kms are you getting....?
if you have the same size (75Lt) tank as mine you should be getting more k's to a tank than that.....

yours is lighter.....
no roof racks for wind resistance....
and the driver is lighter......</span>

[disconut]

[quote=DEFENDERZOOK]<span style="color:blue">how many litres per hundred kms are you getting....?
if you have the same size (75Lt) tank as mine you should be getting more k's to a tank than that.....

yours is lighter.....
no roof racks for wind resistance....
and the driver is lighter......</span>

http://jeep.cfasp.de/upload/31580.jpg


65 litre tank
roof rack fitted
108 kg driver 8O

It does ok.

Trev.

[septimus]

Originally posted by disconut
http://jeep.cfasp.de/upload/31396.jpg

My boost gauge installed.

Trev.

Nice. I was thinking of moving my clock to the panel in the centre that has the cigarette lighter and rear window wiper switches. That would be a good place for the fuel guage if I added the boost and tacho as you have done.

[septimus]

[quote=DEFENDERZOOK]<span style="color:blue">how many litres per hundred kms are you getting....?
if you have the same size (75Lt) tank as mine you should be getting more k's to a tank than that.....</span>

Yeah I was thinking the same. I get about 600km between fills equalling around 10.5 l per 100 km

[DEFENDERZOOK]

Originally posted by disconut


65 litre tank
roof rack fitted
108 kg driver 8O

It does ok.

Trev.


<span style="color:blue">
that makes sense now.....
ten litres less = 100kms less......
roof racks and drivers are equal.....
difference is only the weight of the car....
its all good..... style_emoticons/<#EMO_DIR#>/laugh.gif </span>

[davisshannon]

I installed the boost gauge today. The sluggish acceleration hasn't happened yet with the gauge. When it does, I'll now be able to tell if lack of boost is the issue.

Also, the gauge was sitting at 0 psi when I installed it. After the first drive it is now resting at 2 psi when the engine is turned off. I understand that the line may still have some pressure in it for a second or two, but I would have thought that it would drop back down to zero.

Has anyone else experienced this with a boost gauge?

Thanks

[disconut]

Check that you have not got a kink in the tubing somewhere. The higher pressure will force past it, and the lower pressure, in your case 2 psi, cannot escape.

Undo the fitting at the "T" piece first to see if the pressure drops. My guess is it won't, indicating a problem behind the gauge.

Trev.

[davisshannon]

Thanks. It looks like it is a kink around the gauge. I moved the tubing around right behind the gauge and the 2 psi dropped to 0.

[davisshannon]

It wasn't a kink. It was the light bulb making contact with the spring inside. I made sure it was fully pushed back in its housing, and now things are fine.

Thanks