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Tuning Afrs

Don Dada

By Don Dada,
in Engines & Forced Induction

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BoostedBarge
BoostedBarge

Sorry to go back a page, but I struggle to understand how the cat makes the mixture at the muffler leaner than before the cat. The O2 sensor is just that, an Oxygen sensor, the cat is not producing ox

Rolls Grand Master

Rolls

Posted
Posted (edited)
i think he means if the pump is changed without retune it will affect the afrs due to pressure and flow changes

no it won't, the regulator handles flow/pressure, stock pump or 20x600hp pumps, it is still going to operate exactly the same.

um yes it will and it will change proportionate to the pressure increase.

exactly, it is only the regulator that will have an effect on AFRs

Get a bit of ethanol in that sucker. You got a wideband for it yet? 20% would probably cure it. smile.gif

Or just don't use a shit chipped ECU and tune it properly?

all the backyard tuning in this thread makes baby jesus cry

My thinking on this is all the fresh air letting the engine breath cleaner.

The car in example was tuned with sensor on the dump pipe both on dyno and on road tune.

Far more likely the temp correction isn't good enough and the dyno ramp rate does not match the load curves you get with the gears on the road hence different load cells are hit and different afrs.

Edited by Rolls
SS8_Gohan Grand Master

SS8_Gohan

Posted
Posted
Or just don't use a shit chipped ECU and tune it properly?

all the backyard tuning in this thread makes baby jesus cry

the ECU was fully tunable 'at the time' it was tuned. We just don't have the software to use it out here.

But the setup for my car hasn't changed, so the ECU is fine for the current setup.

Beer Baron Grand Master

Beer Baron

Posted
Posted

yeah nothing wrong with the tune midori made for that car. they are one of the top 10 GTR tuning shops in the world no question about it. it's a bit richer than our tuning philosophy perhaps but that's not to say it's wrong. it's not stupid rich either from memory.

there are no hard and fast rules that cover every engine and every set-up. each car needs to be tuned on it's merits.

Rolls Grand Master

Rolls

Posted
Posted
the ECU was fully tunable 'at the time' it was tuned. We just don't have the software to use it out here.

But the setup for my car hasn't changed, so the ECU is fine for the current setup.

Ah fair enough, I assumed it was an off the shelf chip like those crappy mines ecus.

SS8_Gohan Grand Master

SS8_Gohan

Posted
Posted
Ah fair enough, I assumed it was an off the shelf chip like those crappy mines ecus.

no dramas :P i know what you mean though, the off the shelf 'canned' tunes for 'any' application are playing with fire a bit

it's interesting though how different tuning philosophies have developed between Japan and Oz though, maybe slight diff, but different none-the-less

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted
no it won't, the regulator handles flow/pressure, stock pump or 20x600hp pumps, it is still going to operate exactly the same.

in theory yer, but in the real world bigger pumps seam to result in slighty richers cars for some reason. maybe not every pump and every car but i bet if you take a 100% stock 33 and run it on the dyno, then install a 044 or similar and run it again you'll notice a difference in AFR's

Far more likely the temp correction isn't good enough and the dyno ramp rate does not match the load curves you get with the gears on the road hence different load cells are hit and different afrs.

like i said earlier, most of the difference will be from different widebands, most dyno ones are high quality items which would be spot on whereas the innovate hes using have been known to be pretty innacurate at times

scotty nm35 Grand Master

scotty nm35

Posted
Posted
like i said earlier, most of the difference will be from different widebands, most dyno ones are high quality items which would be spot on whereas the innovate hes using have been known to be pretty innacurate at times

I assume you are talking from experience as you bag the innovative out fairly regularly. Dont some brand names use the same bosch sensor though?

From the other side of the fence, my innovative has been nothing but accurate, more so than some "dyno ones" that get covered in carbon/dropped each day.

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