Dyno Analysis

[Mr Trol]

Hi folks,

Would be keen to get some comments / analysis on the good, bad or otherwise on this dyno graph.

I'm pretty happy with both the numbers and the drivability and would be happy to share details of the build if anyone's interested.

I find the dip in AFR from 2500rpm intriguing and of course can't help but wonder if there's room to squeeze out a bit more [emoji2]http://www.nissanpatrol.com.au/forums/images/imported/2017/02/121.jpg

First Tapatalk, hope I've done it right!


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[Ben-e-boy]

Does this motor have an aftermarket/custom cam? With the stroker kit? (I saw this graph on FB but didnt read the comments)

That fuel it is dumping in from about 2700 is abit odd. I have seen a similar looking graph for a td with a custom cam.

EDIT: scrap that I found and read the post on FB.

[nissannewby]

Wasnt done at gturbo was it?

The turbo seems to be struggling to do anything from the peak kw point. Then the fuel pump is pulling a lot of fuel out from like 3400rpm.

[nissannewby]

Does this motor have an aftermarket/custom cam? With the stroker kit? (I saw this graph on FB but didnt read the comments)

That fuel it is dumping in from about 2700 is abit odd. I have seen a similar looking graph for a td with a custom cam.

EDIT: scrap that I found and read the post on FB.

Its not so much fuel being dumped but the turbo has run out of legs and cannot pruduce enough air to accomodate the fuel. Probably has a small rear housing to get it to spool and generate the torque early which is restricting the efficiency.

[Mr Trol]

Yeah it's running a gturbo bad boy set up mated to an ADS 12mm pump. Opted for the billet stroker kit to be done with the crankphobia.

Thanks lads, smaller housing theory makes sense in explaining the graph.

In truth I'm not sure if I'll change it out, pretty rare to need to go over 3000rpm with this tune.

I'm not running a lift pump yet and had wondered whether it may have been something to do with the pump.


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[nissannewby]

Cool. I thought it was gturbo. As long as your happy thats all that counts.

[Ben-e-boy]

Its not so much fuel being dumped but the turbo has run out of legs and cannot pruduce enough air to accomodate the fuel. Probably has a small rear housing to get it to spool and generate the torque early which is restricting the efficiency.

Yeah I see better now I'm on my tablet :)

[Ben-e-boy]

Yeah it's running a gturbo bad boy set up mated to an ADS 12mm pump. Opted for the billet stroker kit to be done with the crankphobia.

Thanks lads, smaller housing theory makes sense in explaining the graph.

In truth I'm not sure if I'll change it out, pretty rare to need to go over 3000rpm with this tune.

I'm not running a lift pump yet and had wondered whether it may have been something to do with the pump.


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Do you know what the billet crank and rods weigh compared to standard?

[nissannewby]

Do you know what the billet crank and rods weigh compared to standard?

And were they balanced prior to installation?

[Mr Trol]

Do you know what the billet crank and rods weigh compared to standard?

Afraid not mate, I asked the question but he didn't do a comparison


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[Ben-e-boy]

Afraid not mate, I asked the question but he didn't do a comparison


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Ok. It would be nice to know in time. Do the do them to suit the turbo and NA motors? Or are they built on factory turbo dimensions

[Mr Trol]

And were they balanced prior to installation?

I only went so far as checking to see that the crank was counter weight balanced.

Had the ally flywheel balanced but didn't request any other components be balanced specifically and didn't go down the blueprint path (as much as I would have loved to)


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[Mr Trol]

Ok. It would be nice to know in time. Do the do them to suit the turbo and NA motors? Or are they built on factory turbo dimensions

Sure do, my TD42 was originally n/a.


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