YaroRS

how many volts should be at Iddle approximately ?

RS200Z

Tephra has mentioned on post#8 that idle should be 0.8v

kozmic27

Ive never seen an idle maf value of .8v


3.5" maf should idle somewhere around 1.3v-1.4v with a velocity stack. Somewhat higher without. This is with a filter inside the engine compartment (NOT COLD AIR INTAKE).

RS200Z

I just logged my idling with EvoScan and it is reporting values ranging from 1.39-1.57v on my ride with AEM intake.

tephra

iTrader: (6)

yeh sorry I was on drugs :0 the 0.4v number threw me..

makes sense that it should be 1.4v..

Beeble

You mean that as in "(x/1024) *5" in regular math right?

My Evoscan has x*5/1023 with that logging address, and 2byte ... i should change that to x*5/1024 i guess. I'm sure it will make only 0.00x change to MAF voltage

Golden

iTrader: (1)

x/1024*5 will give the same answer as (x/1024)*5

The 1023 / 1024 isn't really that big of an issue. It usually stems from the fact that a software guy looks at it having a max of 1024 values, but from a mathematical point of view, 1023 is the max, so 1023 / 1023 = 1 and will allow you to see the full 5 volts. The ADC has 1024 discrete points. In the end, it's a tiny difference. 1023 is probably the right answer... well, ok, the right answer would be (x+1)/1024*5.

(that is combination of both theories. I have my degree in Comp Science and Math)

Beeble

/nerd/
Thanks Golden.

yeah i ran the numbers and the difference was 0.007v or something at max output.

tephra

iTrader: (6)

yeh its **** all...

obviously for 255 ADC's its a bigger difference, but still **** all

scheides

iTrader: (10)

Perfect, multiply stock values by 1.39, logging shows its perfect. The AEM is a *different* size though, it is not 3.5" so you better just measure it yourself and then do the math



I think your numbers are a little high; I was maxing out my stock maf at what I believe was closer to (and just under) 500hp crank. But thats just guessing, real numbers are 400whp on a dyno dynamics, I'd hit 5v flatline at 6500rpm+. For as cheap, nicely made, and simple of install the primo intake is the way to go imho.

Hiboost

iTrader: (9)

It's possible different cars would hit that earlier, 500 crank vs 550 crank hp is pretty close in my book. I agree that you may as well upgrade since it's so easy to accomodate in tuning now.

EvoStormTrooper

Hi,

Any ideas where to find JDM 52370023 MAF scaling addresses?

It is different from the other maps i think and when using the addresses above,
ECUflash says "The current map is invalid or incomplete, please edit the map description to edit the problem and the map will be viewable again"

is it the hex location or the map itself?

thanks everyone

kozmic27

www.goldenevo.com has the base xml for that rom posted for download

EvoStormTrooper

Hi kozmic27,

Thanks for the reply.

Ive been using the xml from that website you mention, the thing is in JDM 52370024 has the MAF scaling addresses but JDM 52370023 which my ecu is dont have it.

And when i used the address on 0024 into the 0023 xml the Maf Scaling only appears in ecuflash as "incomplete" and i cant see the tables at all.

i even compared it with non-SST maps such as JDM 52370018 has the same MAF scaling addresses with JDM 52370024.

Maybe its not the same address? JDM 52370016 dont have it too.

Anyway, will it make a lot of difference if i change the values when i install a 3-3.5 inch intake or should i leave it and just install the intake without changing the maf scaling?

thanks!

mrfred

iTrader: (50)

its not possible to have a value of zero with (x+1)/1024*5. x/1023*5.