I ran my car on the GTX ECU with no TPS and no knock sensor - Im actually on my 3rd flavor of GTX ECUs now. The car runs fine, you will notice slightly worse gas mileage without the TPS. I doubt the stumbling you notice is due to the TPS. It might be spark plugs other fuel issues etc.
After putting in the knock sensor and 4-wire TPS, the car responded a little quicker but there wasn't a huge increase in peformance I could feel with my butt dyno.
The GTX ECU has less timing advance than the NA one and will result in less power but more safety for bigger boost. I only ran my NA ECU with 10psi of boost and ran my latest ECU up to 18psi (although I dont keep at that normally since the turbo is not big enough)
In other words, you can plug in your GTX ECU in your NA 1.8 harness and be happy with it as long as you have GTX injectors.
After putting in the knock sensor and 4-wire TPS, the car responded a little quicker but there wasn't a huge increase in peformance I could feel with my butt dyno.
The GTX ECU has less timing advance than the NA one and will result in less power but more safety for bigger boost. I only ran my NA ECU with 10psi of boost and ran my latest ECU up to 18psi (although I dont keep at that normally since the turbo is not big enough)
In other words, you can plug in your GTX ECU in your NA 1.8 harness and be happy with it as long as you have GTX injectors.
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