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Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

300tdi boost

Hi,

This week I have been driving around with an adjustment I did to my 300tdi with some good results.

I took off the wastgate actuator pipe and the pipe to the FIP from the turbo and instead plumbed these into the intake manifold directly using the blanking plug on the back of the manifold.

I bought a banjo bolt and union (M12x1.5) from ebay as well as a brass T piece all with 5mm ID hose connectors.

I have a VGT from B.A.S as well as an Allisport intercooler. I had already tweeked the FIP and was getting good performance, but the mod seems to have further increased performance but also lowered the EGT.

Really enjoying the results so far. I haven't checked the pressure, but having much lower EGT's (from 650 now down to more like 400) I am assuming I am not damaging the engine.

Essentially it means that there is compensation for the pressure loss through the pipes and intercooler and ensures good pressure at the manifold.

From a week of driving it (about 600 miles this week!) I would say it all seems to be very positive.

Has anyone else discovered/done this mod?

25th Jul 2014 1:57pm

markns

Member Since: 24 Apr 2013
Location: Halifax
Posts: 2

Great to hear your results... I've got the same setup as yourself (turbo/intercooler) and have been reading the same recommendation on the defender source forum. Any chance of seeing a photo of your connections?
Also wondering where your fueling is set at (diaphragm cone position), did you need to adjust it or the turbo afterwards?
Thanks.

2nd Aug 2014 11:12am

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

Click image to enlarge

Click image to enlarge
I have already adjusted the feeling up both on the cone and also on the max fuel at the rear of the pump. This change to the boost now seems to make it run cooler (EGT) as well as more power.

Really pleased with the results.

4th Aug 2014 4:38pm

g-mack

Member Since: 07 Jan 2014
Location: northumberland
Posts: 1967

very nice set up

your engine bay looks immaculate! My 109 thread

my youtube channel

Last edited by g-mack on 7th Jan 2017 12:55am. Edited 1 time in total

4th Aug 2014 6:05pm

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

cheers gmack! Yep I do have engine bay OCD!

4th Aug 2014 7:09pm

markns

Member Since: 24 Apr 2013
Location: Halifax
Posts: 2

Thanks for the photos... Agreed, that's tidy bit of work

You've inspired me to follow suit...though I'm sure it won't look quite as nice.
Any boost readings or comparisons? (I'm sure they are similar just timed better to the FIP...)

I'll let you know the results on this side of the pond.

Thanks again!

5th Aug 2014 8:51pm

Defender_Td5

Member Since: 20 Jul 2009
Location: Devon/Australia
Posts: 69

1991 Defender 110 300 Tdi USW Stornoway Grey

Re: 300tdi boost

Hi Alex,

I also have the same turbo set up on my 300Tdi. When you say you took off the "pipe to the FIP from the turbo" did you blank the outlet on the turbo itself?

As I understand it (and from you pictures), the pipe from the fuel injection pump goes into the bottom of your T-Piece, one side goes to the intake manifold at the back and the other side of the T-Piece goes to the wastegate actuator. If so that would leave an outlet on the compressor side of the turbo...I think...

If this is the case, do you know the correct size thread for the turbo compressor outlet?

Here is my current set-up, it nice to see someone else with engine bay OCD as well haha:

Click image to enlarge.

What is the physical effect of this set-up? Does it cause the wastegate to open at a different time? To be honest my VGT is a much quieter turbo than the standard 300Tdi Turbo offering, and I kinda of miss the turbo whistle!

Cheers

Rob

Alex1976 wrote:
Hi,

This week I have been driving around with an adjustment I did to my 300tdi with some good results.

I took off the wastgate actuator pipe and the pipe to the FIP from the turbo and instead plumbed these into the intake manifold directly using the blanking plug on the back of the manifold.

I bought a banjo bolt and union (M12x1.5) from ebay as well as a brass T piece all with 5mm ID hose connectors.

I have a VGT from B.A.S as well as an Allisport intercooler. I had already tweeked the FIP and was getting good performance, but the mod seems to have further increased performance but also lowered the EGT.

Really enjoying the results so far. I haven't checked the pressure, but having much lower EGT's (from 650 now down to more like 400) I am assuming I am not damaging the engine.

Essentially it means that there is compensation for the pressure loss through the pipes and intercooler and ensures good pressure at the manifold.

From a week of driving it (about 600 miles this week!) I would say it all seems to be very positive.

Has anyone else discovered/done this mod?

Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated

Last edited by Defender_Td5 on 6th Oct 2014 9:56am. Edited 1 time in total

6th Oct 2014 3:59am

g-mack

Member Since: 07 Jan 2014
Location: northumberland
Posts: 1967

Rob that engine bay is like new!!!!!
how the hell do you get it like that?? no matter how hard i try i cant get my filter to turbo hose looking good! thinking only way is buy a new one. unless you have any concours guru tips

My 109 thread

my youtube channel

6th Oct 2014 9:39am

Defender_Td5

Member Since: 20 Jul 2009
Location: Devon/Australia
Posts: 69

Darn you saw through my cunning plan....well you see it is NEW, everything was new...even my engine....

6th Oct 2014 9:52am

g-mack

Member Since: 07 Jan 2014
Location: northumberland
Posts: 1967

aw man, im totally jealous! lol that must be an awesome tdi you have there! would love to see more! My 109 thread

my youtube channel

6th Oct 2014 11:09am

Defender_Td5

Member Since: 20 Jul 2009
Location: Devon/Australia
Posts: 69

See here for the build thread:

http://www.devon4x4.com/index.php?option=c...Itemid=106

Awesome Tdi: Well it is and it isn't. Despite the following mods it still doesn't go anywhere near as well as I think it should!

- VNT from IRB
- Allisport drop-in replacement intercooler
- Rebuilt Turner Engineering 300Tdi with AMC Turner Performance Cylinder head
- Uprated fueling (diaphragm turned and starwheel)
- Donaldson "Wolf" spec airitake.

I initially thought it was because the engine was "tight" after the rebuild, but after 12,000 miles I am still looking for more get up and go.

Last edited by Defender_Td5 on 6th Oct 2014 11:08pm. Edited 1 time in total

6th Oct 2014 12:54pm

g-mack

Member Since: 07 Jan 2014
Location: northumberland
Posts: 1967

Rob, i bow down to you man!!!!
read your build thread from start to finish.
I have to say that your build is without doubt the most thorough i have seen!!!
if i could choose any of our members cars in a heartbeat it would be yours!!!
awesome job man!!!!awesome!! My 109 thread

my youtube channel

6th Oct 2014 3:04pm

Defender_Td5

Member Since: 20 Jul 2009
Location: Devon/Australia
Posts: 69

Cheers G-Mack, a lot of blood, sweat and tears went into it! Took almost 3 years in total, although the final part was thrashed together in a month because I had moved to Aus by that time.

Maybe I should put the build thread on this forum so others could take a look? Anyone have any answers to my initial post...the O/P seems to have disappeared!

Cheers

Rob

Last edited by Defender_Td5 on 8th Oct 2014 9:28pm. Edited 1 time in total

8th Oct 2014 3:52am

shaggydog

Member Since: 12 Aug 2012
Location: Kent
Posts: 3347

1991 Defender 110 200 Tdi USW Arles Blue

Quote:
Maybe I should put the build thread on this forum so others could take a look?

YES PLEASE

8th Oct 2014 6:56pm

Alex1976

Member Since: 23 Jan 2013
Location: Buckingham
Posts: 596

Hi Rob,

Sorry for the delayed reply. Work has been crazy busy so not much time to get on here!

You guessed correctly about the pipe from the t piece going to the FIP. This does leave the outlet from the turbo that needs blanking. I have not yet found a blanking plug for it as it is an odd thread - I think it is a BSF thread. So I have just a temp blanking pipe on it at present.

The actual effect of this mod is it ensures there is the full 1 bar of turbo pressure at the manifold by the turbo vanes moving to give more boost at any given engine revs.

When the fuelling is matched to this you get a very useable increase in power. Probably just what you are looking for if you think your set up is not producing what you feel it should.

Love your engine ocd! So pleased it's not just me!

8th Oct 2014 8:36pm

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