diesel fuel pump adjustment help please

[gqt]

Just wondering if anyone could please tell me where the adjustment screw is for upping the diesel on the good old rd28t? I've been searching for the past few days and can't find anything. Maybe just typing the wrong search in no idea. But if someone could help out and either link me somewhere that shows? Or just let me know where it is and winding which way does what that would be very much appreciated.

Matt

[YNOT]

It's on the back of the injector pump hidden under a cap to stop people adjusting it. Unless you know what you are doing and have the right equipment you shouldn't be touching it. Technically it is also illegal to adjust it.

Tony

[gqt]

use to be a mechanic till i left and started building instead, better money in building by a long shot lol. got all my mechanic's tools and everything, just didn't want to go touching it without being certain on which screw it was is all. thanks tony.

Matt.

[YNOT]

All good mate, didn't know your background and don't want to be telling everyone it's OK to adjust injector pumps. Best to not be adjusting boost or fuel until you have boost and pyro gauges (that work, haha!).

I know all about mechanics not getting paid well.

Tony

[gqt]

Yeah new boost and a pyro are on the to do list lol. Just getting everything sorted out and ready to be played with while waiting to get them lol.

[gqt]

Ok, need help again with this diesel pump. Is there anywhere on the diesel pump that I can adjust that will lower my boost? I've got my fuel back down to standard. My boost controller all the way down to standard. But I have a issue of hitting the 15psi overboost valve by only 2800-3000rpm. Sitting at 110 on the fwy I'm on 12psi on a dead flat road and 14psi if I'm towing the work trailer. This is really starting to hurt the hip pocket. I want to get the boost down to something more sensible.

[97_gq_lwb]

The boost aneroid This will explain it better.
http://www.landroverweb.com/Pdf-files/Tuning_Land_Rover_Tdi_engines_Rev_2.pdf

[HammerBuilder]

What tyres are u running as with my 2.8 td gq on 33" tyres only running 7 to 8 psi, check down on the turbo waste actuator plumbing should go straight from actuator to T piece n 1 side of the T should go up to pump & other straight to turbo housing , this will give you propper standard boost. If you have a boost controller between actuator n turbo pull it off & route as above . You can still run a boost gauge connected here that's fine .
Standard boost with mine max is 11 psi .

Hope this helps if not I'll try n add a picture later.

[gqt]

Currently for the 35's on. But even on the 31's I can't accelerate on the fwy to overtake it just hits the overboost valve then I lose everything. If anything it hits the overboost latter in the revs then with the 31's.

And yeah I know the hose. I have a boost controller hooked up there but wound all the way down. It all happened when I dropped the exhaust after the flex pipe as my mufflers are blocked heaps and I cannot afford a new exhaust. Before the exhaust was dropped I had the boost controller up 8 clicks and still never hit the overboost.

[97_gq_lwb]

The boost should be regulated by the waste gate.
What wastegate do you have ?
The stock one should open up well under 10 psi.
Tried bypassing your controller ?

[gqt]

It's the stock waste gate. All I can think of is it got tuned with the blocked exhaust so taking the exhaust off has resulted in alot of boost. As like I said with the controller on it was fine before I took the exhaust off.

[HammerBuilder]

Mine was stock & used to open wastegate at 11psi on 2 different brands of guages now with pump adjusted I run 13psi allday everyday but when cruising still only sits round 7 or 8 on the highway as said I run 33x10.5x15's bfg muds all time with bout 38psi in them if that makes a difference (thats bitumen pressure)
Oh yeah I also just re-read your post & no there isn't an adjustment on the pump to lower the boost it is controlled by the wastegate diaphram.
On the pump there is a TPS but this also is only to help in delivery or adjustment of fuel output.
Also did you fit the boost controller as some have a little ball n spring on the turbo pressure side & these also hold wastegate shut till boost overcomes this little spring tension which what you are now describing as won't go bellow 15psi so check if it does & take the ball out & give that a try I had to do this on a mates that runs a Turbosmart Boost T, now is fully adjustable right down to standard boost.

Cheers hope this helps this time.
TonyD

[robbo0001]

Mate...I have saved this thread to my "favourites"...Currently running 33s on a 2.8TD with boost and pyro guages fitted. (by myself)
To MY knowledge (second owner) no engine mods...currently max 13 PSI boost and never hit more than 450 degrees C on the pyro. (with no engine/fuel changes by myself)
Looking at winding down fuel a "tad"...if required I will fit a manual boost controller to sdjust.

Highway at 110km...contant 12-13psi (back off accelerator pedal, immediate boost drop)

[97_gq_lwb]

Well bypass your controller and give it a try.
No matter what you do to the fuel the wastegate should open up at a set psi .
So something is faulty.

[gqt]

I'll take the boost controller off tonight if it doesn't rain and again and see what happens. It's just a cheap eBay job manual boost controller. But yeah it's only happened since dropping the exhaust. And I know freeing things up can raise boost. But shouldn't be to this extent.

My boost gauge is in bar. Playing with the diesel pump I can change it slightly on the fwy. Lowest I can get it to sit is 0.7 bar at 110 on the 35's with only a quarter tank of fuel and one passanger. Adjusted it the wrong way the other day and it was sitting on 1.0 bar the same as above with quarter tank and one passanger not towing.

[97_gq_lwb]

Yeah really all it can be is that or your wastegate actuator not working is it an adjustable actuator arm ?
It Can be the rod has been bent for higher boost.
Or they sometimes space the actuator mount out with spacers as well.
Could even be a replacement actuator for higher boost as well pretty hard to tell they look the same as stock just open up at a higher psi.

[HammerBuilder]

Mate...I have saved this thread to my "favourites"...Currently running 33s on a 2.8TD with boost and pyro guages fitted. (by myself)
To MY knowledge (second owner) no engine mods...currently max 13 PSI boost and never hit more than 450 degrees C on the pyro. (with no engine/fuel changes by myself)
Looking at winding down fuel a "tad"...if required I will fit a manual boost controller to sdjust.

Highway at 110km...contant 12-13psi (back off accelerator pedal, immediate boost drop)

Yep robbo0001 the later intercooled did run 13 like yours is, the early 97 & before were not intercooled so run lower boost so maybe gqt's turbo was updated to a gu unit as they are all bolt on bits even the intercooled intake manifold is different.

gqt keep us informed as to what you find & how you go...
Cheer TonyD

[robbo0001]

Thanks Hammer....
I just learnt something new...and thats always good.
I always thought the GQ 2.8TD was the same engine in the GU 2.8TD....happy to work-out the GQ 2.8 is not intercooled OEM.
Glad to hear 13 psi is stock on a GU...and I don't need to worry about overboost issues yet!
Greatly appreciated mate.

EDIT... not a thread hijack..my apologies Qqt

[HammerBuilder]

Too easy robbo I always try to help & I am always ready to listen n learn

Cheers tonyD

[gqt]

No concern on hijacking mate. I'm here to learn anything and everything I can :)

So found out where my fuel was when I got the car wouldn't of been standard. As had it wound back to there and just found out over the weekend that it was still blowing a heap of black smoke out from under it. So wound down another quarter of a turn, no more black smoke now :)

Boost wise it's down to 0.6 bar at 110. Can actually fully rev out in 1st, 2nd and 3rd now. 4th hits overboost at 3,200rpm now up from 2,800rpm. So I'm quite happy with it now. And it's doing heaps better on the economy side also :) still have not removed the boost controller yet though. Will still remove it to see if it makes a difference.