Thread: TD5 dyno

my td5 auto with a tombie map and ''other'' mods

this is at the wheels and with a dead head gasket was 260psi/cyl now 320psi/cyl.


cheers phil

How much diference is the power at wheels as to the engine. 86 kw does not seem like much when you see HSV Holdens quoting 315 KW ,but what are they at the wheels. I think I will try and get a dyno reading before my remapp and again after. I have heard, perhaps incorectly that a D2 diesel can put out up to 185KW but this must be at the crank.

Mike

Auto's lose a lot more, but wheel kW is what matters. the figure ive been told for auto's is 40%? i dont know if thats correct or not, but if you add the 40% loss to my wheel Kw's you get close to 140kw which is what the company (BAS) is quoting for his figures.

as for the 185kw, yes that would have been a flywheel KW.
my 90 had a 200kw/490nm chip and lots of ''other'' mods and it was hands down better than my auto D2. although i never had it on a dyno my sums indicated it should have been in the 120kw region at the wheels.

but at the end of the day, it shouldn't matter what the loss is, its whats actually being put to the road.

cheers phil

Originally Posted by Disco mike

How much diference is the power at wheels as to the engine. 86 kw does not seem like much when you see HSV Holdens quoting 315 KW ,but what are they at the wheels. I think I will try and get a dyno reading before my remapp and again after. I have heard, perhaps incorectly that a D2 diesel can put out up to 185KW but this must be at the crank.

Mike

I believe that all specs quoted by manufacturers about engine power output is measured at the flywheel, it's competition between manufacturers as to who has the most powerful car off the showroom floor. A BF XR6 turbo has less power than the XR8 at the flywheel but up to 160km/hr on the road, the turbo is quicker. Wheather that be because of gearing or weight or delay before the 8 stretches it's legs I'm not sure?
Kw output to the road is the figure that matters, every car will lose a different percentage along the drive train.

From previous testing...

TD5 Disco Auto... Stock at all 4 wheels - 44-47kw (avg)

Chipped - 80-88kw (performance chip)

There are variations, including geographical location, dyno operator, dyno calibration, temp etc...

Also slightly varied mapping can attribute to different results..


Rapserv, have you tweaked your boost on the wastegate yet?

Originally Posted by Tombie2

From previous testing...

TD5 Disco Auto... Stock at all 4 wheels - 44-47kw (avg)

Chipped - 80-88kw (performance chip)

There are variations, including geographical location, dyno operator, dyno calibration, temp etc...

Also slightly varied mapping can attribute to different results..


Rapserv, have you tweaked your boost on the wastegate yet?

Do you have manual figures also?

Thanks.

have just returned from another quick trip down to melbourne, but over the weekend prior to leaving, I did a light check over the disco... coolant and oil levels and cleaned out the air filter. Thought I would double check all the hose clips on the silicon hoses used in the intercooler circuit and also checked the wastegate modulator hoses. I discovered that the tube from the wastegate modulator to the metal pipe section on the intercooler circuit was off. Not actually off ... but torn off beside the hosetail on the metal pipe end I have had this once before and fixed it but somehow it has done it again.. even though there is sufficient slack in the rubber tubing. I trimmed the rubber tube and reconnected it (still seemed to be sufficient extra length) and noticed quite a substantial gain in power on the trip to melbourne. One short hill in particular near seymour, with cruise control enabled and sitting on 110kph always forces a lower gear change towards the top. Just before the climb there is a slight downward direction and this causes the cruise control to think that it should back off a bit and after wiping of a few k's it encounters the hill and tends to struggle a bit towards the top and consequently changes down. With the hose now repaired I found that the disco powered all the way to the top without ever looking like it was even thinking about a downshift.
Whilst in melbourne, I once again noticed the car to be a bit sluggish and checked the hose again only to find that it had done the same again... torn off near the hosetail Once again I have fixed it and the disco performed brilliantly all the way back to wang. I have now bought some new good quality hose and fittings and will fix this problem once and for all.
I am now thinking that I should have another dyno done as this hose would have been broken during the tests and I am sure would have made quite a large difference.
I would advise anyone with a d2 TD5 disco to check this 'out of the sight' hose connection ... yours may be broken and a simple fix could give you noticeably more go. When you think about it, a boken rubber tube at the hosetail is about a 5mm hole in your intercooler circuit, which of course is under pressure, and is probably equivalent to having loose hose clips that allow that all important pressure to escape.
I'll get another dyno done in about a week and just for interest will post the results again.

Tombie... As mentioned in my original post I have fitted a 'TD5 Alive' electronic wastgate controller and made some adjustment to the wastegate knurled adjustment knob. I have only made a minor correction to it as the installation instructions for the 'td5 alive' emphasized not turning this too far as it could have serious consequences with regard the engine damage. Problem is that I don't know if anyone has adjusted this prior to me and if so.. how far. In the end, I counted the number of exposed threads from the end of the adjuster in the pictures that came with the controller and set mine the same.
Can you, or anyone else for that matter, advise how to correctly adjust the controller and if any special equipment is necessary.. nanacom, etc.

regards to all..... dave

What sort of $$$ do these people charge for a dyno run???
Once mine is finished with my messing I wouldnt mind seeing what the money spent has produced at the wheels.
Thanks
Andrew