Thread: How to modify VQ Table??

I wonder what its the correct procedure to modify a VQ Table in order to get X or Y results my question comes from my desire on how to get better resolution on low voltages from the Q45 Maf on a all motor SR20VE any Inputs are welcome...

The x scale of the VQ table is the fixed linear MAF voltage and cannot be changed to increase resolution in a particular part (low voltage in your case) of the table. This is a typical problem with a large MAF sensor in that the air flow at low RPM with throttle closed is not large enough to maintain a stable reading (voltage).

Dave

Exactly as Dave said, this is why you don't want to use a bigger maf then you absolutely have to. VE maf and E60 maf's are good for 325whp, should be good for virtual any NA VE setup.

The only problem with the Q45 maf its the Idle that its kind of erratic but other then that its all good... Just going for every whp available I already had a 3.5" intake setup so i needed a maf to match the intake

The easiest way to "tune" the vq table is to log MAF voltage vs wideband air fuel ratio OR STFT.

I have a maf monitor window in NismoTronic that is used just for this reason.

Well, if it's only really idle that gives you problems, open the throttle body a little and live with 1500rpm idle...

Did you find a Q45 MAF Adapter anywhere or just made your own?

I cut the adapter part on the maf and used a coupler directly to the maf....

Its not that bad jejejeje I still can get a 900rpm steady Idle

The ECU controls the idle speed to the values set in the idle rpm table based on CLT. Opening the throttle plate, or adjusting the idle bleed screw, will only force the ECU to retard timing and close down the IACV to try to control the idle speed. If you want to increase idle speed, change the values in the table.

The new version of TunerCode provides a solution to this problem by allowing you to program a hybrid control system based on MAF. TPS, or MAP. With a large MAF, you can use TPS as the load sensor up to programmable limits (TPS.RPM.etc.), then switch over to MAF based load.

Cheers,
Dave