Standard Boost for 2.7 TDi ?

[Timbo_1975]

Anyone?

I am getting bang on 10psi.

I had a feeling it ought to be a shade under 15psi ??

TIA Tim..

 

[CHASTER]

Hi.
My t2 runs at an average max of 10psi ,(give or take the odd lb) and I have been advised that it is about the best; any more MIGHT lead to head gasket problems.
A higher boost may need a chip to increase fuel input otherwise there will be no benefit from extra boost. 8)
Don't know about yours but mine goes like a demon anyway at 10lbs boost and it romps up hills even when well laden. :wink:

 

[Toolbox]

It should be around 0.9bar that equates to around 13psi if that helps.

 

[Timbo_1975]

Thanks both...

I should add that the 10psi was measured at the Inlet Manifold (I've had the hose adapter off, and drilled & tapped it) and there is I daresay a psi or 2 lost in the intercooler, so the turbo could be blowing at 12psi...

Any how, I have wound up the wastegate 3 turns which equates to 12psi at the inlet manifold now.

I am experiementing with some adjustable plug-in chip's to see how it best responds, but will possibly go with a ECU remap in the finish.....

I too have fitted an 11" intercooler fan, and it keeps the charge temps down well after being stood or slow moving traffic, and it definately picks up much better, but after about 40mph sustained fullboost doesnt cause any alarming rise in charge temps.

Tim..

 

[CHASTER]

Hello again Tim.
Am interested to know what sort of performance improvement you got after winding up the waste-gate from 10 to 12psi at intake. I am thinking of upping mine a tad but am a bit short of courage :smile: :roll: keep thinking about extra burden on gaskets :? Suppose there's only one way to find out :smile:

Have you done enough miles to judge any difference in fuel usage ?

I too have installed a fan on the intercooler and definately feel the benefit when pulling away from traffic jams etc.

 

[Timbo_1975]

I've done about....10miles since tightening the wastegate, so cant judge any MPG difference as yet.

If your's behaves similarly to mine, then you dont reach anything like full boost unless you are over 2500rpm and pedal to the carpet, so the 10 or 12psi is only seen by the engine at that point.

My engine is woefully short of fuelling anyhow, as there is never any smoke whatsoever other than just off tickover so I won't be getting any increase in power until I sort the fuelling.

(and yes it has a nearly new, and freshly cleaned MAF!)

I will report back when i have experiemented some more.

Tim.

 

[rustic]

I will be fitting a boost gauge to my 2.7TD in the next 2 weeks. Non intercooler (more toys). All this talk about boost has intrigued me.

Can anybody advise the best place to tap into.
Is there a pressure line I can "T" into or should I drill and tap the casting that goes over the rocker box? ( Has "TURBO" cast into the top of it)
The casting looks favorite to me as I can remove it to drill and clean the swarf.. Might adjust the tappets as well, once off.
regards, Rustic

 

[Deleted Member S]

Hi Rustic :smile: If your going to tap in you could do it on one of the rubber hoses as you can get a fitting to do it & I think that is how chaster did his :? I'm going to be doing the same soon hopefully & have notice there is a small rubber pipe that come off the turbo & was wondering if I could tap into this :roll:

 

[Timbo_1975]

Indeed you can get 'self-sealing' two piece fittings which are deigned to fit into a rubber hose. Never tried em, and don't know what small sizes they come in.

I tapped the inlet adapter as an engineer that is how I would normally do it!

Would be interested to hear what boost the TD runs at...

Tim..

 

[CHASTER]

I am surprised that you have to put foot to floor to get 10psi boost Tim. Mine reaches it at about 1/3 to 1/2 throttle when on load; any more "gas" and I can see, on the guage, that the wastegate takes over.

Regarding boost tap-off points; I inserted a tee piece into the rubber tube which joins the intercooler to inlet manifold. Had to be carefull because the gap between intercooler and intake is only about 10mm (on my bus anyway). It is just a plastic tee which was supplied with the guage and modified to suit. In this position it reads the pressure going into the intake, of course. 8)

 

[Timbo_1975]

Interesting to hear that. Is it standard or chipped?

As I said, i am certain that mine is very short on fuelling, which is why the turbo is being lazy.

It is only a baby Garrett T2 (0.48 turbine, 0.46 compressor - almost exactly same spec as Saab fitted to the 9000 2.0 LPT) so should spin readily with 2.7 litres behind it, but without fuel its just free wheeling almost...

Tim..

 

[rustic]

I will be fitting a boost gauge to my 2.7TD in the next 2 weeks. Non intercooler (more toys). All this talk about boost has intrigued me.

Can anybody advise the best place to tap into.
Is there a pressure line I can "T" into or should I drill and tap the casting that goes over the rocker box? ( Has "TURBO" cast into the top of it)
The casting looks favorite to me as I can remove it to drill and clean the swarf.. Might adjust the tappets as well, once off.
regards, Rustic

I can't believe it has taken me this long to fit it, I bought it off ebay last JULY:nenau anyhow, I tapped into the small pipe, that comes off the casting that has "turbo" on it, (non-Intercooler 2.7TD) and the reading I get is 0.6 kg/cm2 I converted this to psi and it comes out at 8.5psi, this is where the yellow sector on the gauge starts to change to red, is this about right?
Also the gauge has a green sector that shows vacuum but it never shows -ve pressure, so what is this for?
Basically, have I placed the tap off point in the right place?

Thanks, Rustic

 

[Timbo_1975]

Sounds about right for a TD, perhaps a tad low.

 

[Deleted account DD]

Could anyone please be good enough to post some pcs of boost gauge installations :thumb2

I'm thinking gauge in cab as well the tap in point point under the bonnet.

Thanks in advance :thumb2

 

[Terranosaurus]

Also the gauge has a green sector that shows vacuum but it never shows -ve pressure, so what is this for?

Green bit is for petrol engines - you're very very unlikley to ever get negative (over atmosphere) pressure (partial vacume) with a diesel, with a petrol you get it everytime you back off or just run with part throttle as the engines demand for air exceeds the throttle body or carbs ability to provide it with an almost closed throttle. With a diesel theres no throttle flap so no chance of negative pressure.

 

[Timbo_1975]

...unless your air filter is long overdue for change, or you have other intake restrictions...

 

[rustic]

Green bit is for petrol engines - you're very very unlikley to ever get negative (over atmosphere) pressure (partial vacume) with a diesel, with a petrol you get it everytime you back off or just run with part throttle as the engines demand for air exceeds the throttle body or carbs ability to provide it with an almost closed throttle. With a diesel theres no throttle flap so no chance of negative pressure.

When I had an Austin Ambassador, (1.7 petrol) I fitted a vacuum performance gauge, this behaved in the way you described, it was fitted in the same place as the Mav ie in the inlet manifold, it too had green, red and amber sections. The trick was for best economy to keep the needle as high as possible. This of course never read +ve pressure as there was no turbo.

Thanks for the info.
Best regards, Rustic

 

[extreme-4x4]

Thanks both...

I should add that the 10psi was measured at the Inlet Manifold (I've had the hose adapter off, and drilled & tapped it) and there is I daresay a psi or 2 lost in the intercooler, so the turbo could be blowing at 12psi...

Any how, I have wound up the wastegate 3 turns which equates to 12psi at the inlet manifold now.

I am experiementing with some adjustable plug-in chip's to see how it best responds, but will possibly go with a ECU remap in the finish.....

I too have fitted an 11" intercooler fan, and it keeps the charge temps down well after being stood or slow moving traffic, and it definately picks up much better, but after about 40mph sustained fullboost doesnt cause any alarming rise in charge temps.

Tim..

could you explain this bit in more detail please

thanks

 

[lacroupade]

could you explain this bit in more detail please

thanks

you mean clockwise or anticlockwise.....your candlelit bath has clearly dulled your senses!! :lol:lol:lol

 

[makeitfit]

I've got my turbo boost gauge working now but stupidly hadn't read this thread:augie
I've fitted the supplied T piece into the tiddly hose that comes off the turbo waste gate actuator thing. Is this acceptable?:nenau
I tried it tonight under er "test" conditions ie red line:sly Never got more than .75 Bar(thats 10.5 PSI)
Seems to come in consistantly at around 2100-2200 Rpm at .5 -.6 bar and then the .75 to .8 max in screamer mode:naughty
What should I expect?
Is there a preferred place to "tap" off?