flash7210 wrote:
If I read that chart right, a stock MAP sensor should read up to about 29 psi of boost. Correct?
So what can't the ECM be programmed to allow 29 psi of boost?
Now, if you wanted more boost without reprogramming the ECM, install the 3.5 or 4 bar sensor. The ECM will think it's seeing 22 psi but it will actually be much higher.
You could turn the boost up to 29 psi if you wanted, just might not be so good on the stock turbo. The purpose of this is not to trick the ecu, it's to allow people to go with a new turbo, such as dieselguy's, and properly tune it if it can exceed 3+bar absolute pressure.
All turbos really care about is the pressure ratio. So if our turbo can run a 3:1 pressure ratio then it could hit 3 bar at sea level. I am currently running mine at 2.4 bar at .8 bar ambient pressure without to much issue besides maybe some high IAT's, so it may be possible to push a sea level turbo to 3 bar. I don't really wanna be the one to try though.
I honestly just think our turbines are too restrictive. I think our EMP's skyrocket before our compressor runs out of steam.
WWDiesel wrote:
mass-hole wrote:
What tmap did u plug in and what happened? Did the Jeep not start or something?
Did not try one, was just curious as to what are the benefits of going to a tmap sensor with the higher mbar range...
Still thinking on how to solve limp mode issue when using high boost levels ~35 or greater...
The purpose of this is for guys like dieselguy with big turbos that are pushing over 3 bar. If your not then there is no point in a 3.5 or 4 bar map. He gets away without it probably because his turbo flows more air than can be utilized by the injectors so he's not having an issue running rich anyways.
WWDiesel wrote:
When mine went into limp the other day when I turned the PP up all the way to max and got on it hard up hill (petal to the floor), it did not throw any codes; cycling ignition switch cleared the limp mode. Strange thing to me was it did not go into limp until after I let off go petal!
Have not turned it up above 50% anymore...
The power pick is essentially doing exactly what flash did with his resistor mod.
Speaking of that, flash, WWDiesel and I figured out that if he turns up the puck too high in combination with a tune like yetis stage IV it can cause a boost runaway of sorts. Be careful running your resistor and a tune. What I think happens is that when you get enough resistance in there, plus a higher boost request, it can cause the MAP output voltage to not be able to hit what the ecu is looking for and so it keeps trying to make more and more boost.
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