VTPS, 4BarMap, and more installed. The car will idle but tries do die when the accel - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-19-2011, 02:49 PM   #1
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Default VTPS, 4BarMap, and more installed. The car will idle but tries do die when the accel

I installed 729cc injectors, a 4bar map, and vtps. Over all the map install seemed to go well, but I honestly have no clue.

The car will idle, but when I attempt to give it gas the idle drops to the point of the car dieing. Now whats interesting is that this morning when I went out to the garage to check on the car, I was actually able to move it, but I had to drive in reverse. (This is not stuck in reverse) Then after driving around the complex in reverse for a while I put it in first and the car actually when forward. That is not the case now, I tried it and it still dies.

So over the past few days I installed all the things listed above. As I said the MAP seemed to go fine. But when I look at TunerStudio it noticed my Manifold Pressure Temp is listed as high a 400 deg. That makes me wonder if the MPA sensor has anything to do with it.

I'm not sure about the injectors, they were brand new, and seemed to idle the car fine, and again the car drove backwards this morning.

Now the VTPS gave me fits. I'm using one from a BMW 735 with the 6 pin connector. When I tried to calibrate voltage, the values seemed to be the opposite of what they should be. My Full throttle was around 29, and closed was around 228.

I'm freaking a little because I need my car this weekend, and I have no clue where to go.

Can anyone help. I've attached a MSQ and log. BTW I have not started tuning for the new injectors yet, since the car won't drive. OH and I was previously using RX7 460 cc injectors.
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Old 05-19-2011, 02:57 PM   #2
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you reversed two wires on your tps.

you screwed up something on your AIT calbration.

did you retune for larger injectors? req_fuel, enrinchments, cranking, etc.?

Did you recalbriate for the larger MAP sensor?
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Old 05-20-2011, 01:22 AM   #3
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I wondered, about the TPS, if figured it was one of two outside wires, I never thought about center ground. Matt suggested that as the fix. I will give that a shot in the next few minutes.

I've never calibrated the AIT, I didn't even know I was suppose too. to that, I don't even know where that setting is.

I adjusted the injector size in the constants in Megatune before recording the log Tuner studio. I did not adjust the enrichment or PW cranking yet, because I can't find the formula.

I will look for the formula for PW and enrichment first. Is the AIT calibration in one of the Mega Manuals?

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Originally Posted by Braineack View Post
you reversed two wires on your tps.

you screwed up something on your AIT calbration.

did you retune for larger injectors? req_fuel, enrinchments, cranking, etc.?

Did you recalbriate for the larger MAP sensor?
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Old 05-21-2011, 10:37 AM   #4
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I think the VTPS is now working, I adjusted the PW Cranking, and the Accel Enrichment. I unplugged and replugged in the AIT sensor, and it seems to be fine now.

But I noticed my map sensor is reading atmosphere, however ever my boost gauge works. They are on separate lines. I wonder if the line coming out of the MS is kinked, because it was a very tight fit. Has anyone had an issue with this installing a Map Daddy in a MSPNP?
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