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2004+ GTP injector tables

Well, it's the same in HPT also....only thing I can guess is that it's for vacuum. Most of the driving is like that anyway, but the 97-03 tables are only half of that, more simple I guess.
 


Reptile said:
If you're ever in DHP, you multiply the stock injector tables by 78.5% and boom.
Click to expand...

Ok, I'm really new to this, but this doesn't seem right to me. Help me understand what I'm missing here.
(My math says %77.65 btw)
BUT if I multiply the IFR by %77.65 (scaling down the IFR) the car won't even stay running for more than a few seconds, sounds like it's starving for fuel.
However If I multiply the IFR by the inverse (%128.78) then my trims are good and no more P0171.
 
It appears that Reptile used 33/42 (78.5714%) instead of 42.5. I get the same thing you got using 33/42.5 (77.6470%). So what you are doing is taking 42.5/33= 1.2878 or 128.78%?

Jeff
 
J57ltr said:
It appears that Reptile used 33/42 (78.5714%) instead of 42.5. I get the same thing you got using 33/42.5 (77.6470%). So what you are doing is taking 42.5/33= 1.2878 or 128.78%?

Jeff
Click to expand...

Yes, exactly. I was using 42.5 but my injectors are in fact 42s so his math was right and yes in DHP I have to scale the IFR by %127 instead of %77 in order for the car to run.
 
So for 60's it's going to be 181.82%. I guess now I just need to figure out what I need to change in DHP to go E85.

Jeff
 
J57ltr said:
So for 60's it's going to be 181.82%. I guess now I just need to figure out what I need to change in DHP to go E85.

Jeff
Click to expand...

Under Fuel, set Injector_Skew_Percent to 125 for winter or 130 for summer. I set mine for 127.5.

To get deeper into the IFR non-issue, DHP's IFR table is for "milliseconds per gram" so theoretically you'd lower the numbers with bigger injectors because it would take LESS milliseconds to spray one gram of fuel. And there is for sure a number of people here that LOWERing the mSec/Gram worked like it should. Not sure if DHP version makes a difference or anything.
 


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That skew did nothing for my car. I changed it to 127.5%, 130% and 134.5% and back to 100% and it made absolutely no difference at all. I ended up changing the IFR table by 27.5% and it was too lean then added 30% and that was still too lean, then changed it to 34.5% and it's perfect. I don't think the Skew changes anything on my 05' for some reason.

Jeff
 
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