Thread: Need help with stock SR20DE MAF please!!!

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2008-12-21 04:31:30

sentradude Online/offline status of sentradude is unknown

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Need help with stock SR20DE MAF please!!!

Calum programmed my realtime for n60 MAF however by the time i got it back i realized that at this time I will not be able to use it and will use my stock sr20 usdm maf.. I need to know what I need to change on my ECU before i can start my car, I am using TunerPro RT software. Please help!!

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2008-12-21 10:57:47

billc

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For starters, the VQ map has to match the MAF that you are using. But I'm not sure whether anything else needs to be changed as well.

What is your set up? I have a collection of VE bin files using the USDM DE MAF and can send you one as an email attachment.

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2008-12-21 14:45:18

sentradude Online/offline status of sentradude is unknown

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I have stock sr20de with 370 inj. avenier turbo, walboro, and now the sr20 maf instead of the n60..

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2008-12-21 18:12:35

billc

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Originally Posted by sentradude

I have stock sr20de with 370 inj. avenier turbo, walboro, and now the sr20 maf instead of the n60..

Sorry, I have no turbo bin files. The best that I could do would be to send you a bin with the VQ map for the DE MAF. You could copy the values from this table into the VQ table of your current bin using the Tuner Pro copy and paste capability. Basically this would assure that the voltge readings made by your DE MAF are properly converted into "flow" values by the ECU.

As I said, I really do not know whether this is all that you need to do. Let me know if you want me to send a bin file with the USDM MAF VQ table.

Good luck,

Bill

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2008-12-22 01:25:35

Doug_O

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He may need to change more than the VQ map. Check this out.

Originally Posted by Boostcruising.com
Upgrading the AFM (air flow meter) or upgrading injectors.

In my case, I installed an RB20DET AFM, which is known to flow around 310ps (knowing what it flows and knowing that the value is accurate, is IMPORTANT!). In order to make the car run with this AFM, you will need to do TWO things..

The most obvious one to most people, is changing the VQ Map (which is commonly referred to as the VE Map, but stupid jap translated program has introduced confusion to some people). A basic summary of how things work, is the VQ map’s values are proportional to the injector pulses, and the base value that it works with is the “K required number” that is in HEX that you’ll find in the Global tab in the ROM Editor program… how to work out what value to change that to is relatively simple..

Take the current value that’s there.. in the case of the CA its 00B7 (.. which is B7 in hex which is 183.. if you haven’t played with hex before, just pull up the windows calculator and click on View and select scientific mode.. then click the Hex check option thing and type in the hex value, then click decimal and there’s its actual decimal value)..

Alrighty.. so say.. B7 is the value in mine, and that’s suited for an AFM with a resolution up to 190ps (stock CA AFM).. in your case.. the SR20 AFM has a resolution up to 210ps.. what you have to work out is the new “K required number” to suit your new AFM.. my new afm was an RB20 unit of 310ps.. so this is how I worked it out..

Current AFM = 190
Current AFM K required number = 183
New AFM = 310
New AFM K required number = ???

So.. you gotto work it out… bit like this..
(just use windows calculator and when open, click View and select Scientific)

190 / 310 = 0.612903

Then get the base number of 183 divided by the above.. soo..

183 / 0.612903 = 298.579057
Then click on the Hex option in the calculator while that answer is still in it.. and I have the value 12A.

The Rom Editor program likes this entered in as 4 digits.. so the new value to put in there is 012A (zero, one, two, A)

And then, you're done!

Boostcruising.com

Just looking out for ya.

Doug

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