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hhorton
August 6th, 2009, 10:34 AM
I had my stock injectors resized to 36lbs@3BAR. I'll skip the long winded explanation of my tuning changes but ended up adjusting the IFR table by 121% to get to the final numbers I think are good. Check out the LONGFT graph and tell me what you think. Have I got it dialed in? This log was taken while I drove to work.. about 5 miles in town driving.
mr.prick
August 6th, 2009, 10:46 AM
121%?
What size were the injectors originally?
How did you come up with this?
joecar
August 6th, 2009, 01:31 PM
Did you use the spreadsheet (which uses the squareroot pressure equation)...?
hhorton
August 6th, 2009, 02:24 PM
121%?
What size were the injectors originally?
How did you come up with this?

Sorry, should have written 21% increase from stock. The stock injectors for a 2000 F-Body are 26lbs.
hhorton
August 6th, 2009, 02:28 PM
Did you use the spreadsheet (which uses the squareroot pressure equation)...?

tried to but the figures came out much higher and i was running WAY lean so I just took the stock figures and started adjusting them by a flat % increase until I got what looked like a good LONGFT.

Below are the stock and final figures when you multiply the stock by 121%


Manifold
Vacuum
PSI Stock Value Stock * 121.00%
0.0 26.414064 31.96101744
0.7 26.600079 32.18609559
1.5 26.786093 32.41117253
2.2 26.910103 32.56122463
2.9 27.096118 32.78630278
3.6 27.282132 33.01137972
4.4 27.406142 33.16143182
5.1 27.592156 33.38650876
5.8 27.716166 33.53656086
6.5 27.902181 33.76163901
7.3 28.026190 33.91168990
8.0 28.212205 34.13676805
8.7 28.336215 34.28682015
9.4 28.522229 34.51189709
10.2 28.646239 34.66194919
10.9 28.832253 34.88702613
11.6 28.956263 35.03707823
mr.prick
August 6th, 2009, 02:52 PM
That's a 21% increase
121% would be more than twice the original value.
1.21 = 21%
2.21 = 121%
121% would be too high of a increase.
hhorton
August 6th, 2009, 03:59 PM
That's a 21% increase
121% would be more than twice the original value.
1.21 = 21%
2.21 = 121%
121% would be too high of a increase.

Yes, multiplying a value by 121% is the same as multiplying by 1.21, hence a 21% increase.


But back to the original question. Is the LONGFT result looking good? Should I do more logging at higher speeds (highway)?