I bought all of the parts listed and hooked everything up. This now allows me to remove my MAF, right?

 

No, the map sensor is just so that you an read your current boost or vacuum.

 

And you can now run your load reference based off of the map instead of the maf.

Which brings up a question.... If you are now running fuel based off of a map value, then can you run a vta bov, due to the fact the maf is no longer the reference point for fuel? I might be missing something as I am on my 15th hour here at work.

 

Don't forget you can also run closed loop boost control..

And thats a good question, however I think the issue with the VTA BOV has more to do with very low load reference where the UTEC would not be operating, likely that the ECU is in closed loop mode (Where the UTEC would not be acting on it)

Just so you know, I can swap my stock MAF sensor in and out with my new blowthrough setup (it takes 3 minutes) I had to put my stock sensor in for a few days and my car is running basically VTA with the UTEC and stock MAF and it has not stalled, so its possible this does work.

Anyway, its likekly that I've just been lucky and hadn't hit the circumstances where you would stall running VTA therefore don't bet the farm on that working for you.

So far the blowthrough setup I'm running works amazingly, but I still have to do some idle calibration on it.

https://www.evolutionm.net/forums/sh...d.php?t=100437

 

I finally had a chance to try a calibration run with the Wells SU105 3-bar MAP sensor. The troubling things started when I saw that default psi showing up as 23.6psi at 0psi boost without the engine even on. On idle at -19psi vacuum it showed -10.6psi. The real problems showed up when under boost. It seems to max out at ~6psi boost with a D/A reading of 255 on the UTEC. The gradient and intercept for this sensor are:

Gradient = 130
Intercept = 275

Clearly this is NOT acceptable for use as an external MAP on the EVO. Yesterady I went and bought an Echlin replacement that's actually marked with the GM number (12223861). I'll test it today (I hope). I sure hope it works better than the SU105!

 

19PSI of vacuum?

I made the same mistake If you are going off your boost gauge remember that it is in in/hg not psi. Try to use zero instead it will make it easier on yourself.

Ben

 

Did the Echlin work?