1.9 TDI AXR rate my tune please

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1.9 TDI AXR rate my tune please

Postby fakagraff » Mon Apr 14, 2025 5:29 am

Hello everyone, could you tell me if my AXR 1.9 TDI file is correct? I'd like to perform Stage 2.

I'm not sure if the N75 map should have been modified this way. Im not sure if the N75 map should have been modified this way
if there a calculation to understand how much duty percentage to modify?

On the other hand, I think I've maintained the correct EOI by increasing the injection duration / soi

Any help is welcome. I'm just learning based on what I'm reading and studying

thanks and regards!
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fakagraff
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Re: 1.9 TDI AXR rate my tune please

Postby nikotlb » Mon Apr 14, 2025 9:55 am

If you have OEM turbo, there is no need to touch N75 (actually the turbo will work worse then before with this tune, you closed the vanes a bit, just leave it stock its better).
Also you don't need to touch that much the injection.
SOI you can leave stock and increse a couple of degrees in the duration 0 and 1
You need to change your driver's wish, last row you cant put 70 everywhere.
Your limiter will be the smallest value between TL, DW and Smoke limiter.
Calculate your smoke limiter to be in the range of 16-17 AFR, if it does smoke alot, just adjust after

Can you tell your hardware list ?

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Re: 1.9 TDI AXR rate my tune please

Postby fakagraff » Tue Apr 15, 2025 3:58 am

The modification would be for a stock vehicle, a KP39 turbo with a maximum requested boost pressure of 2300 mbar, and a boost limiter at 2350 mbar, ok N75 maps dont touch.

I'm looking for a Stage 2 without excessive smoke. According to my calculations, the minimum AFR with my modification should be 16.6

The IQ, TL, and Smoke limiters are all based on 65 mg, so I should inject 65 mg.

Driver wish: the maximum requested IQ is 65 mg, not 70 mg.
I request 65 mg, and then it decreases. Is this incorrect?

I'm requesting and searching for 65 mg because, extrapolating the "Duration" column, I get a maximum value of 39 degrees, and 39 degrees with an SOI of -28.50 maintains an EOI of 10/11.
The SOI limiter table is 28, i modify to 28.50

You tell me to only add 0 to 1 degree in the duration table but if I keep the original injection and only increase the "Duration" column by 1 degree, I wouldn't get the 65 mg. I'm looking for. According to the "Duration" table, 2 degrees are required for every 5 mg of fuel injected. Therefore, 39 degrees for 65 mg at 4000 rpm should theoretically work fine.

According to my SOI table, I understand that I'll use the Duration 0, 1, 2 maps, which correspond to -15, -22, and -27 degrees SOI.

Is my thinking incorrect? I don't have a vehicle to test it on; I did it based on the theory I learned.

Thanks for the help

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