Wastegate Adjustments

[LandyAndy]

Decided to get stuck into getting some boost out of BlackBetty today.
The best boost I had seen on the Nanocom was 1.01 bar so time to play.
With many adjustments finaly got it up to 1.25bar.WOW what a difference,top end isnt much different but the mid range improvement is great.Guessing she should tow much better.She is now running in hot weather like she does on a cool morning.
Jimmy chased me up the highway in his 3.5 Rangie and was VERY surprised that a little 2.5 diesel could more than match his V8:p:p:p:p.
.25 bar increase sounds small,but it is a 25% increase.
At one stage I was getting quite frustrated that 3 turns did diddly squat I pulled the hose off and did a wastgate free run:eek::eek::eek::eek:,good to see the overboost protection works and it was logged(3 times:twisted::twisted::twisted:).The limp home after is what BlackBetty has been like most of the time.
Worth messing with,why do they get so far out of spec????
Andrew

[Graeme]

I've read that early ones were set low. My '03 (bought new) has 1.34 written on the actuator as though that was the factory setting.

[rangieman]

Decided to get stuck into getting some boost out of BlackBetty today.
The best boost I had seen on the Nanocom was 1.01 bar so time to play.
With many adjustments finaly got it up to 1.25bar.WOW what a difference,top end isnt much different but the mid range improvement is great.Guessing she should tow much better.She is now running in hot weather like she does on a cool morning.
Jimmy chased me up the highway in his 3.5 Rangie and was VERY surprised that a little 2.5 diesel could more than match his V8:p:p:p:p.
.25 bar increase sounds small,but it is a 25% increase.
At one stage I was getting quite frustrated that 3 turns did diddly squat I pulled the hose off and did a wastgate free run:eek::eek::eek::eek:,good to see the overboost protection works and it was logged(3 times:twisted::twisted::twisted:).The limp home after is what BlackBetty has been like most of the time.
Worth messing with,why do they get so far out of spec????
Andrew
I thought you had played around with this last year and had got similar results
Not that i doubt you its like ground hogs day ;)

[LandyAndy]

Yes I had Rangieman
Yes I did get good results.
I have had the turbo off in the last few months and changed over to no EGR,fixed broken exhaust studs and a leaking manifold.Hadnt got around to looking at the wastegate again.
I did ask in the post "why do they get so far out of spec"
Messing with this dosnt still answer lots of questions why the performance varies so much and why fuel economy is so up and down.
Andrew

[rangieman]

Yes I had Rangieman
Yes I did get good results.
I have had the turbo off in the last few months and changed over to no EGR,fixed broken exhaust studs and a leaking manifold.Hadnt got around to looking at the wastegate again.
I did ask in the post "why do they get so far out of spec"
Messing with this dosnt still answer lots of questions why the performance varies so much and why fuel economy is so up and down.
Andrew
Thats cool , I just remember that you fiddled last year and had good results;)

[LandyAndy]

No worries
Just wish the thing would stay running sweet once you get it right.
Im not the only one with a TD5 who is sick of varying performance/economy.
Fitted a new AFM also recently,so I guess that is another vairable added to the equation.
Andrew

[Gold_TD5]

No worries
Just wish the thing would stay running sweet once you get it right.
Im not the only one with a TD5 who is sick of varying performance/economy.
Fitted a new AFM also recently,so I guess that is another vairable added to the equation.
Andrew


Whats a AFM, do I need one? I'm guessing you mean the MAF sensor?
Since I adjusted the wastegate for some more boost, I now have a stutter/hesitation at 23-2500 rpm on acceleration.
I can accelerate through the gears and it wont do it, it's only in top gear.
I disconnected the MAF sensor which stopped what felt like a miss at constant throttle but the stutter/hesitation remained.
When I adjusted (clockwise, shortening the rod) the wastegate I went to far till it overboosted and lost power then wound it back, could I have gone too far the other way and now it's opening too early;)
Do I need a new MAF sensor?
My fuel ecconomy has been pretty constant, 900 k's to 80 litres of fuel, not complaining about that.

Thanks Lionel

[LandyAndy]

Hi Lionel
AFM/MAF the one in the air intake next to the airbox.
Mine has a miss when giving it revs in neutral around those revs but dont feel it under power.Always has,just put it down to it having an odd number of pistons.
Ive checked the cylinder balance with nanocom,there is a bit of changing of the values but not excesive.
Andrew

[Gold_TD5]

Thanks Andrew, I wound out the wastgate some more, stutter/hesitation gone.
I too have varying performance, sometimes I think it's in our heads;)
Definitely affected by ambient temperature.
Question for all TD5 owners, how hard do you rev your engine in normal conditions?
I would not go much over 2700rpm going through the gears (manual)
There does not seem to be any power gains going over 3000 so I don't bother.

[LandyAndy]

Dont usually bush it beyond 3000rpm.When testing it the otherday it was pulling hard to around 4200revs,much to the disgust of the young bloke from work in his Rangie.
No black smoke either,only a puff on gearchanges apparentley.
Andrew

[XSiV]

I have found varying economy and power with different fuel. When I first got my Td5 130 I almost always got fuel from the same place. This fuel was 'Premium Diesel'. A couple of times I fiueled up at another place and noticed a dramatic drop in power and economy. So much so that I took it back to Bruce Davis to get him to find out what happened to my chip. He couldn't find anything wrong and on the way back I had to refuel. Once again I went ot the place I usually went and lo and behold the power seemed to return. I also got about a 100km's less out of the questionable tank of fuel.

This might be something you might want to look at if you are having constantly varying power and economy.

Cheers
Josh

[discowhite]

i only notice vairing performance on alternating hot and cold days:eek: but i only run BP in the 90.....its always fast:p

cheers phil

[Redback]

Decided to get stuck into getting some boost out of BlackBetty today.
The best boost I had seen on the Nanocom was 1.01 bar so time to play.
With many adjustments finaly got it up to 1.25bar.WOW what a difference,top end isnt much different but the mid range improvement is great.Guessing she should tow much better.She is now running in hot weather like she does on a cool morning.
Jimmy chased me up the highway in his 3.5 Rangie and was VERY surprised that a little 2.5 diesel could more than match his V8:p:p:p:p.
.25 bar increase sounds small,but it is a 25% increase.
At one stage I was getting quite frustrated that 3 turns did diddly squat I pulled the hose off and did a wastgate free run:eek::eek::eek::eek:,good to see the overboost protection works and it was logged(3 times:twisted::twisted::twisted:).The limp home after is what BlackBetty has been like most of the time.
Worth messing with,why do they get so far out of spec????
Andrew

How many turns have you gone Andy, I noticed an improvement at only one turn when shortening the rod.

Baz.

[llandro]

According to my manual, the waste gate actuator is set to open at 1bar.
I have seen a 300tdi with the boost pipe moved from the outlet of the turbo to the inlet of the plenum chamber, the object being for the actuator to now sense the 1bar pressure at the cylinder head, not the turbo outlet.
In theory, I suppose this should improve performance, (no pressure drop across the intercooler) but in practice I wonder does it?
llandro