dyno report on 3litre patrol

Submitted: Monday, Apr 18, 2011 at 09:12
ThreadID: 85705 Views:1997 Replies:5 FollowUps:6
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Have 2007 3litre auto patrol it was tested on a dyno on 15/4 results as follows does anyone have specs on what is "normal'?
turbo 13-15 psi across full rev range
power low of 42 kw max of 60 kw.
torque max 430nm at 45kph,400 nm at 63kph,250nm at77kph,270nm at85kph,140mn at 130kph

power seems lower than i expect,fuel consumption very high approx 6klm/litre on average emmits black smoke most of the time,any advice appreciated thankyou.
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Reply By: Member - DAZA (QLD) - Monday, Apr 18, 2011 at 09:51

Monday, Apr 18, 2011 at 09:51
Toyota owners will tell you to buy a Toyota lol,
Our 2008 Patrol seems ok re: power since I installed a Steinbauer Chip, it tows ok,
Fuel Consumption is down when towing but ok when not towing,
It's the cooks shopping trolley and I only drive it when we are touring, it's not run in yet it has just over 27000ks on the clock.

AnswerID: 451628

Follow Up By: pepper2 - Monday, Apr 18, 2011 at 10:20

Monday, Apr 18, 2011 at 10:20
Daza,thankyou for your reply,out of interest is your patrol man or auto and what are your consumption figures ???
FollowupID: 724255

Reply By: ross - Monday, Apr 18, 2011 at 10:24

Monday, Apr 18, 2011 at 10:24
I thought the dyno operator would have given you the low down on whats/not good.
The "power low" figure of 42kw doesnt make sense
I havent seen dyno torque figures expressed alongside speed in klms.
Its normally given in rpms in a gear closest to a 1:1 ratio,usually 4th gear.
Usually they give you a graph showing before and after figures(if your having adjustments made)
The important figures are the max kw and the max torque figures.
Ideally ,max hp should occur at twice the rpm of the max torque figures.

Is your dyno operator certified and his dyno calibrated?
My old HZJ75 pulls about 62 kw at the rear wheels on an uncalibrated dyno although that figure is about normal for a 1HZ with highish klms and the fuel turned down .

AnswerID: 451633

Follow Up By: pepper2 - Monday, Apr 18, 2011 at 11:04

Monday, Apr 18, 2011 at 11:04
I do have a graph read out but dont know how to show it here i could scan and email it to someone if they provide email and they may be able to show it here or just comment on it themselves,ross my email is timfitzgerald2008@hotmail.com if you would like to reply.
FollowupID: 724261

Follow Up By: ross - Monday, Apr 18, 2011 at 21:35

Monday, Apr 18, 2011 at 21:35
Tim ,I think the low kw figure speaks for itself.
The usefull info is the maximum kw at what rpm and the same for the torque.

I agree with what TerraFirma said,you shouldnt have had to pay to prove its not running right,but I can see they have you between a rock and a hard place.

They cant deny a fault now and I would be asking the branch manager for a refund of the dyno results.
FollowupID: 724344

Reply By: TerraFirma - Monday, Apr 18, 2011 at 11:02

Monday, Apr 18, 2011 at 11:02
Why are you getting the vehicle dynoed without addressing the problems first.?
If the vehicle is not running right then take it to a diesel mechanic, there are plenty of them around, it is not difficult to diagnose a diesel engine. Fuel and Air are the 2 factors. When was the last time the vehicle was serviced by a Nissan dealer.?

A 2007 model should not have done too many KM's, my Hilux is 2005 and has done 120,000Kms. It doesn't blow smoke but it is serviced every 10,000KMs.

AnswerID: 451638

Follow Up By: pepper2 - Monday, Apr 18, 2011 at 11:48

Monday, Apr 18, 2011 at 11:48
It has been to nissan dealership it is under warrenty and in my view underperforming,Nissan wont check it out unless i pay for dyno test first independant mechanics have tested/inspected it they confirm it is underperforming,they want to test exhaust gas pressure before the catalytic converter tomorrow as they suspect the catalytic converter may be blocked reducing performance It has done 84000km
FollowupID: 724263

Follow Up By: TerraFirma - Monday, Apr 18, 2011 at 11:55

Monday, Apr 18, 2011 at 11:55
If it is blowing black smoke all the time surely the dealership will acknowledge that. You having to pay for a dyno just to prove a point sounds ludicrous, what is the world coming to? If Nissan won't support you during warranty then you should be kicking up a stink and threatening to never buy another Nissan again?

FollowupID: 724265

Reply By: Robin Miller - Monday, Apr 18, 2011 at 11:38

Monday, Apr 18, 2011 at 11:38
Hi Pepper

Those figures don't mean much, normally power should be measured against RPM and in a known gear usually a 1:1 gear by default.
4th in a manual 3rd in your auto.

New I think yours is around 118kw at 3400rpm @ 354nm .
So with typical 30% driveline loss the approx
figures for good condition unmodified car should be roughly
83kw and 248nm.

Torque is just a mathematical derivation from power so no need to plot it
however most DYNO plots do show it because torque is multiplied
by diff ratio, or other gearing if not 1:1 and they don't bother to correct
the reading.

So in your car it is impossible for the engine to make 430nm , so they
haven't said the conditions i.e. what gear / uncorrected for diff ratio etc.

It looks like yours may even have been in auto using different gears !
Robin Miller

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AnswerID: 451645

Follow Up By: StormyKnight - Monday, Apr 18, 2011 at 20:19

Monday, Apr 18, 2011 at 20:19
In addition I think the torque is multiplied by the slipping of an auto gearbox when under load & not electrically locked up....
FollowupID: 724326

Reply By: StormyKnight - Monday, Apr 18, 2011 at 20:17

Monday, Apr 18, 2011 at 20:17
Can you dyno an auto anyway? I can't lock mine in 3rd, but i can lock it in 2nd (2nd start & T-bar in 2nd), but then the gearbox won't lockup in any gear but 3rd & 4th....

In third there is no way is going to stay there with full throttle at low revs.....

Can it be done?
AnswerID: 451712

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