Tuning Afrs

[DVS JEZ]

  Strik3r said:

If you adjust the fuel regulator, the AFRs wont change at all...

Thats all well and good ifuhave an adjustable fuel pressure reg.

[STATUS]

  Strik3r said:

If you adjust the fuel regulator, the AFRs wont change at all...

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

[SimonR32]

  STATUS said:

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

WHS

[Rolls]

  DVS32R said:

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.

  STATUS said:

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

  scotty nm35 said:

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

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

all the backyard tuning in this thread makes baby jesus cry

  DVS32R said:

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 November 22, 2010 by Rolls

[SS8_Gohan]

  Rolls said:

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]

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]

  SS8_Gohan said:

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.

[Harey]

  Rolls said:

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

Um do yourself a favour and check out his car, aint no off the shelf chips on that monster! I am in awe of that car.

[SS8_Gohan]

  Rolls said:

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

no dramas 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]

  Rolls said:

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

  Rolls said:

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]

  JonnoHR31 said:

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.