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Been Rolling Roaded And A Few Question

Paulpen

By Paulpen,
in Engines & Forced Induction

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Paulpen Contributor

Paulpen

Posted
Posted

First of all - hello there from England :)

I was wondering if the great knowledge of SAU would be able to give me a hand with my dyno graphs as im not really in the know on them :woot:

Its a RB25DET engine in a 200SX and only has a few mods (decat, cat back exhaust, air filter, fuel pump and fmic).

Here are the graphs

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untitled1.jpg

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Some people have said its overfuelling and to turn the boost up to lean it out and others say they are all like that and its how it should run :)

Ive also heard that the boost graph is a bit odd as it goes up rather than down at the end :)

Can anyone shed some light on this ?

TiTAN Grand Master

TiTAN

Posted
Posted (edited)

If you are running the stock ECU, that will explain why it is running so rich winding up the boost will just make it worse due to the way Nissan programed the fuel maps. You will be able to get the car up to 270hp @ the wheels with a tuned aftermarket ECU, ~12psi of boost, and an aftermarket dump and front pipe.

Edited by TiTAN
The Mafia Grand Master

The Mafia

Posted
Posted

Stock ECI is crap.

Get a Powerfc and lean those mixtures, and I guarantee you'll notice an improvement.

ALso, after about 10psi of airflow, the ECU starts to go into a "rich and retard" mode that causes massive power loss (30rwkw)

Paulpen Contributor

Paulpen

Posted
  • Author
Posted

Awesome :banana:

Its nice to get an answer with reasoning behind it !

That would explain the power dip, torque dip and afr reading going to shit around 4000rpm then as thats when it goes over 6.5psi of boost ??!

So I assume I should be looking at getting the following next :

Downpipe

Turbo elbow

Boost controller

Engine management

I say assume as the wording over there seems different to over here so dont really know what you mean by dump pipe :blush:

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