Chicken Drumstick Posted March 24, 2016 Share Posted March 24, 2016 Have done a bit of searching on Google, but not really found much. Has anyone got a dyno graph from a Tdi engine? Don't mind if it's stock or tuned, just as long as it states which. Ta. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 24, 2016 Share Posted March 24, 2016 This seems to cover it: Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted March 24, 2016 Author Share Posted March 24, 2016 Ta. I did see that on Google, but I can't make sense of the numbers tbh. Seems to suggest sub 54hp as standard. Even at the wheels that seems somewhat low. Yet the torque seems to be quoted in Lb, which I have no idea what it is. But it's 470Lb for standard. Afraid these numbers mean nothing to me. The curve profiles might be correct though. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted March 24, 2016 Share Posted March 24, 2016 This is the graph International released that shows the stock 300TDI and the 2.8. There are various actual graphs around like the one above. The torque "Lb" is lb-ft at the wheels, which is why it seems high. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted March 24, 2016 Share Posted March 24, 2016 I'll add that actual dynos that are around show very flat power curves above peak torque, unlike the International curve above. IME, that is how they behave in reality. Constant power from 2000 to 3200 rpm and then a slight decline to the rev limiter. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 24, 2016 Share Posted March 24, 2016 HP on the right hand side, but reckon you can get what you need from Red90's reply Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted March 24, 2016 Author Share Posted March 24, 2016 Ta. But there is still something wrong with that first chart. 54whp and allowing a large 20% loss would still mean 67.5bhp flywheel estimate for a stock Tdi. And I've had vehicles on dyno's myself and seen lots of charts. Wheel torque figures will not be higher like that. The only thing I can think to explain this, is they dyno'd it in a non 1:1 gear ratio. But even then that really shouldn't have produced such odd results unless it's operator error. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 24, 2016 Share Posted March 24, 2016 I'm not sure what LR drivetrain losses are, but I would somehow think they are a bit more than 20%, but happy to be proved wrong. Will of course depend on tyres used as well, if on muds, then well, not a lot to say *edit* checked another thread and they used 33% as the figure... Quote Link to comment Share on other sites More sharing options...
Ex Member Posted March 24, 2016 Share Posted March 24, 2016 Ta. But there is still something wrong with that first chart. 54whp and allowing a large 20% loss would still mean 67.5bhp flywheel estimate for a stock Tdi. And I've had vehicles on dyno's myself and seen lots of charts. Wheel torque figures will not be higher like that. The only thing I can think to explain this, is they dyno'd it in a non 1:1 gear ratio. But even then that really shouldn't have produced such odd results unless it's operator error. 54 hp at the wheels for a nearly 20 year old vehicle is pretty much expected.... This is how they can claim such big improvements. You take in your POS vehicle is carp tune and they fix that... If you want to know your real power, do a top speed test. It is pretty easy to get an accurate number that way. Final drive ratio in 4th gear is 1 * 1.41 * 3.54 = 5:1 in 4th gear. The wheel torque is 5 times the engine torque. Many dyno operators type in the final drive ratio and what is displayed is corrected to show "engine" torque. Quote Link to comment Share on other sites More sharing options...
western Posted March 24, 2016 Share Posted March 24, 2016 standard defender spec 200tdi should be 107bhp & 188lb/ft torque. Quote Link to comment Share on other sites More sharing options...
Sheffield Posted March 25, 2016 Share Posted March 25, 2016 Interesting that Bowie's graph shows peak power and torque at around 2,000 to 2400 rpm, which is the engine speed the automatic gear box in vehicles so fitted ties to maintain. Suggests to me that is what Land Rover intended and the graph is about right. Quote Link to comment Share on other sites More sharing options...
Lewis Posted March 25, 2016 Share Posted March 25, 2016 Didn't Hybrid_from_hell have his V8 90 dyno'd? He may be able to give an idea what they used as a transmission loss figure Quote Link to comment Share on other sites More sharing options...
muddy Posted March 25, 2016 Share Posted March 25, 2016 Didn't bull bar cowboys 3.9 build thread have some dyno stuff in it? Also boydies blueprinted 300 disco has ~94 at the wheels iirc Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted March 25, 2016 Share Posted March 25, 2016 Yes, BBC had 33% in his thread. Quote Link to comment Share on other sites More sharing options...
Diesel_90 Posted March 25, 2016 Share Posted March 25, 2016 I've never had a land rover on a dyno myself but I have always thought about putting my 300tdi on to see what it actually makes. From my experience of playing with cars there is normally 35-45 horse power difference between Brake Horse Power and Wheel Horse Power in a front wheel drive car (Honda Civic Type R EP3). Also one massive factor is every dyno seems to read slightly different figures and there a lot of makes of Dynos and tuners that have reputations for "different" readings. I would be very interested to see if anyone has played extensively with a Tdi on a dyno and what results were. Quote Link to comment Share on other sites More sharing options...
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