4.8L Performance upgrade options

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Re: 4.8L Performance upgrade options

Post by Peter Connan » 21 Jun 2018 11:31

Instead of 0-100 and 0-80 acceleration runs, consider doing in-gear acceleration runs, second or third gear.

Ideally these should be videotaped from a position where the rev counter is visible. Then you can get a very good idea of what the difference is in given rev bands.
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Re: 4.8L Performance upgrade options

Post by CarloG » 21 Jun 2018 12:22

Peter Connan wrote:
21 Jun 2018 11:31
Instead of 0-100 and 0-80 acceleration runs, consider doing in-gear acceleration runs, second or third gear.

Ideally these should be videotaped from a position where the rev counter is visible. Then you can get a very good idea of what the difference is in given rev bands.
Good point. Lack of access to an closed airstrip may make some of those in gear accelerations difficult.... :think:
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Re: 4.8L Performance upgrade options

Post by Peter Connan » 21 Jun 2018 18:29

That's why I recommended second or third. Should be able to stay vaguely within the speed limit that way.
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Re: 4.8L Performance upgrade options

Post by CarloG » 21 Jun 2018 18:50

Peter Connan wrote:
21 Jun 2018 18:29
That's why I recommended second or third. Should be able to stay vaguely within the speed limit that way.
Help me Peter: what would the methodology be?

1. Drive on freeway in second gear at Xkm/h (or RPM?), accelerate with foot flat (won't it change into 1st?) and then time it from x km/h to Ykm/h - what would the x and y be?

then repeat in third gear, but at a higher speed/rpm?
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Re: 4.8L Performance upgrade options

Post by Tinus lotz » 21 Jun 2018 19:01

I think for a start take your patrol to sac and just do a power run ....after exhaust do it again ...then you get ok results .
Note that rgm gives wheel kw but flywheel torge
At least you will have a independible measure to see what gains you are getting ....ask ross on rhe dino to plot power at 1000 rpm 2000rpm ect sure its possilble at least we can see what the pipe does

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Re: 4.8L Performance upgrade options

Post by Mystical_Beast » 21 Jun 2018 19:25

I did the stage 1 through Rob Green, very recently.
I’m not going to get into the misconceptions around chip tuning.
And the variable degrees of honesty amongst various tuners.
There are tuners which will tune for maximum gains, you’re going to be sorry and then chipping is bad.
Some Tuners claims are extraordinary!

What I will say though is that I have 6 private vehicles and all are chipped.
And I am well aware of the difference a chip makes.
On a naturally aspirated vehicle on an engine running optimally, a chip and exhaust will make minimal difference, but not all vehicles are running optimally by any measure.
So a chip assists a good tuner to tune out mid-range flat spots etc. and there they make a vast difference to drive-ability.
Essentially a tool to plot optimum settings you air fuel and timing and to store those settings.
The chip itself does nothing, its just a storage facility, memory, like an SD card in your phone.
Nowadays people advocate, no chip, reprogram the Ecu directly as if this is somehow new wisdom?
I will stay with a chip thank you.

In my particular case, my Patrol had a huge flat spot in the midrange and that was dialed out through tuning, which made the car altogether better everywhere.

I then moved on to a Super Charger on the same vehicle, again its just better everywhere.
The 4.8 needs a Super-Charger more than it needs anything else.
Without it, its pretty lackluster.

In my opinion!!
The Super charger is the only performance mod I would look at on the 4.8 petrol.
Mine was written off, unfortunately.
But I have another new one and its still under factory maintenance and warranty but I’m sorry, it wont see Nissan for anything and within the next week or so its having a Super-Charger fitted.
Fitting a Super-charger is like dumping your frumpy wife for a Super-Model.

Yeah its worth it. :lol:

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Re: 4.8L Performance upgrade options

Post by CarloG » 21 Jun 2018 19:41

Mystical_Beast wrote:
21 Jun 2018 19:25
a Super-Charger .

Yeah its worth it. :lol:
Thanks.
Who did the supercharger for you and why did you opt for supercharger vs turbo?
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Re: 4.8L Performance upgrade options

Post by Mystical_Beast » 21 Jun 2018 19:51

RGM

A Supercharger gives you diesel like tractability with linear performance.

A no-brainer.

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Re: 4.8L Performance upgrade options

Post by Mystical_Beast » 21 Jun 2018 20:20

My figures on my Patrol were 685 NM of torque and 226 wheel kilowatts. That's a whole 100 more than I had before.

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Re: 4.8L Performance upgrade options

Post by Peter Connan » 22 Jun 2018 05:10

CarloG wrote:
21 Jun 2018 18:50
Peter Connan wrote:
21 Jun 2018 18:29
That's why I recommended second or third. Should be able to stay vaguely within the speed limit that way.
Help me Peter: what would the methodology be?

1. Drive on freeway in second gear at Xkm/h (or RPM?), accelerate with foot flat (won't it change into 1st?) and then time it from x km/h to Ykm/h - what would the x and y be?

then repeat in third gear, but at a higher speed/rpm?
Tiptronic should hold it in the selected gear.
I think it's less about the speeds achieved than it is about the revs achieved. Choose the revs to suit your driving style, or just do the whole rev range. If you can record it (go-pro or even you cellphone), you can always later time it on the video for selected rev bands (1000-3000 or whatever you fancy).

It is important to use the exact same piece of road though, as even a slight gradient can make a huge difference...
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