PI : DI Ratio Discussion

[KoolBRZ]

Originally Posted by thambu19

When you get a chance can you try something like this? At WOT I have gone 100% DI. This means you need to a degree or so more spark there to use the full potential. If you do not then it will feel sluggish compared to stock calibration.

Can you use the PI thresholds now? If not, cells below .35% and 5000 rpm will be the same as zero %. I also wonder if there are any PI multipliers in effect, because that would cause the cells with .703 to exceed .75 and then those cells are the same as 100%. However, I don't see how running your PI table will hurt.
Because of the way my AT trans shifts in response to throttle input, this is one table that should be different between MT and AT tunes. I'll try it with the thresholds bypassed over .5 load instead of 1.5, so that the cells below 5000 and .35% will have some effect. Then I will compare it to my other tunes and let you know.

[thambu19]

Originally Posted by KoolBRZ

Can you use the PI thresholds now? If not, cells below .35% and 5000 rpm will be the same as zero %. I also wonder if there are any PI multipliers in effect, because that would cause the cells with .703 to exceed .75 and then those cells are the same as 100%. However, I don't see how running your PI table will hurt.
Because of the way my AT trans shifts in response to throttle input, this is one table that should be different between MT and AT tunes. I'll try it with the thresholds bypassed over .5 load instead of 1.5, so that the cells below 5000 and .35% will have some effect. Then I will compare it to my other tunes and let you know.

Sorry I didnt pay too much attention to thresholds but if you can change the thresholds to get these ratios that will be cool. As I said before going 100% DI at wot requires you to add more spark in those regions where I took away from PFI and added DI

[KoolBRZ]

Originally Posted by thambu19

Sorry I didnt pay too much attention to thresholds but if you can change the thresholds to get these ratios that will be cool. As I said before going 100% DI at wot requires you to add more spark in those regions where I took away from PFI and added DI

Here's a zip file with the B01C definition file. In RomRaider open definition manager and delete your current file first, then unzip this def and add it to the def manager. Open your tune and look between ALPHA OverRun Fueling, and Fueling - Transient. You'll see a new category there called Fueling - Injector Ratio. Inside that are the thresholds.
P.S.
This is a def file with definitions for the cold start tables as well. You can easily modify your cold start to be lower in rpm and quieter.

[thambu19]

Wow that's impressive. Thanks budd

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[thambu19]

I'm going in soon for my first service. Will ask them to flash b01c then I will make all these changes

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[steve99]

Originally Posted by thambu19

I'm going in soon for my first service. Will ask them to flash b01c then I will make all these changes

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Hmmm if your car is in for 1st service (ie 6 months old) it will be a calid later than B01C
likely D00C and its not backwards compatable with B01C :-)


C Series
ZA1JA700C ,900C, A00C ,A01C , B00C all compatible with ZA1JB01C
ZA1JD00C for late 2014/2015 cars only
ZA1JF00C for late 2015 cars

[thambu19]

@Steve mine is 2013 my but just has 7k miles...

I did oil changes myself and this will be the first time I am actually taking it in to the dealer just for the record books.

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[ztan]

Originally Posted by thambu19

Steve mine is 2013 my but just has 7k miles

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Are you using OFT or Tactrix? Pull your stock ROM first and let us know what your calibration ID is then we can get you up and running with the right defs.

[KoolBRZ]

@thambu19 I just sent you a B01C def because you posted a pic with that CAL ID. I just figured that was what you had.

[thambu19]

Originally Posted by ztan

Are you using OFT or Tactrix? Pull your stock ROM first and let us know what your calibration ID is then we can get you up and running with the right defs.

Hey @ztan. I bought a Tactrix but the unit failed to connect/read so sent it back and they shipped me another. Should arrive in couple of days. Since mine is 2013 MY im sure its pre B01C. I want the dealer to update it to B01C since they introduced the Pre-Ignition and idle fixes with it? Im worried that if I update it myself they will find out that the calid is different when I take it in for some warranty work.

I am itching to try out some PFI/DI cal changes and E85. The Takeda Intake has arrived and I want to install that as well with the right MAF scaling.

I love the intake honk from 4K onwards but pretty sure I can make it happen even earlier by changing the AVCS. But that is pretty much what OFT OTS cal does too. They moved the Exh timing creating more overlap and this should make more intake noise although their reason for doing it was for more torque and less torque dip

@KoolBRZ Thanks a ton mate. Got a chance to try out 100% DI? I don't know why the OEM did not calibrate for full DI at low speed WOT. Defeats all my engine knowledge. I can only think of emissions as a likely reason for staying with 50% PFI DI split.

[thambu19]

@ztan and @KoolBRZ
I will pull up my rom and send you folks and you can hook me up with the latest RR def that I can use.

[KoolBRZ]

Originally Posted by thambu19

@ztan and @KoolBRZ
I will pull up my rom and send you folks and you can hook me up with the latest RR def that I can use.

I loaded a tune with your suggested revisions first, and didn't even load any of mine to compare. It was so much better! @!#*&% you! I made 4 other tunes to try out, and now they are all worthless! Blast you and your intelligent mind! Now I'm going to have to rethink these principles you based your revisions on so I can find how far the limits are so I can push it to the limit.

[thambu19]

Originally Posted by KoolBRZ

I loaded a tune with your suggested revisions first, and didn't even load any of mine to compare. It was so much better! @!#*&% you! I made 4 other tunes to try out, and now they are all worthless! Blast you and your intelligent mind! Now I'm going to have to rethink these principles you based your revisions on so I can find how far the limits are so I can push it to the limit.

I am glad it worked mate. Did you adjust the spark whereever the new tune uses more DI than base tune? You should. DI can take way more spark than PFI. We should create a smooth blend. At lower loads we should go as much PFI as possible.

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[thambu19]

If yourintent is best engine response and can sacrifice fuel economy there are other cool things we can do with cams at lower loads. Maybe better for a sports mode calibration if we can switch between the two at some stage. I'd calibrate the cams completely differently if I want performance instead of mileage

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