Something to remember is that if you have a misfire it will read lean on the 02 sensor. So if you have a misfire it is possible the "auto tune" will add fuel and make it overly rich(smoke).
You can see in this log the fuel goes a little rich, then goes off the scale lean, then goes off the chart rich, the color of the fuel lines are yellow & light blue, the color codes are at the top of the graph area.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
Something to remember is that if you have a misfire it will read lean on the 02 sensor. So if you have a misfire it is possible the "auto tune" will add fuel and make it overly rich(smoke).
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
People refer to , "Off the trailer pass",, Mine is "OFF the FREEWAY pass", LOL,170 miles round trip due to LOTS of road closures GRRRRR 1st pass was the best. 11.04 @ 123.07 4100lb race weight, Did some tuning & learned what it does NOT like, I forgot to raise the rev limit & still bumped it, even in high gear. I added & pulled timing & fuel, it likes 37 total timing & so far 12.6 AFR, still no 10.99 pass, I am sure with some more tuning it could get there, BUT thinking about my combination here are some points, it is only a 9.7-1 compression, Max Wedge ports,, HEAVY pig with a 28" tall tire & 3.54 gear, I truly believe that my car needs a 4.10 or there about gear, to do much better on the ET, this is a drive it anywhere true street car DA was in the 400ish
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
You have 10 second speed....... but not enough speed to get it done with that 60’.
Have you tried removing those blue “socks” from the air filters?
And the “crowd” went wild!!!!
No on the pre filters, I should have, I thought about it but I ran out of energy & started getting shaky, I was done. I brought some extra stacks that have no filters, but like I said, I ran out of steam.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
You have 10 second speed....... but not enough speed to get it done with that 60’.
Have you tried removing those blue “socks” from the air filters?
And the “crowd” went wild!!!!
Did you ever get to make a good pass with carb and the fuel system sorted out?
At 4100lbs...... 123mph shows 585hp. Pretty good for a true street car.
Never made another carbed pass, the best MPH carbed was 121.1 & it was not laying down like it did later on. I will try a total runner length of 23" , it is at 17" now
Last edited by csk; 02/09/2012:26 AM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
Hey Dwayne This program APP I use is very close to what I have found on the dyno with IR intake set ups, not every engine reacts the same [ CID, CSA of port,cam,, ect ] but my engine is close to the ones I have dynoed, that said, the runner length helps at a given RPM & hurts power at other RPMS that is not in the usable range of said length, right now my set up is 17" runner. Input length is 17 inches For 2nd harmonic, RPM range is from 6911 to 8386 with a pulse strength of 10 percent For 3rd harmonic, RPM range is from 5192 to 5934 with a pulse strength of 7 percent For 4th harmonic, RPM range is from 4048 to 4527 with a pulse strength of 4 percent --------------------------------------------- I am using the 3rd harmonic pulse right now , the 2nd pulse is above my RPM range the 4th is bellow my converter stall. --------------------------------------------------- Looking at my coverter stall on the data log, I am at 4800 rpm at the leave,,,so that means that my engine is in the bad part of the good harmonic pulse range 5192 to 5934 with a pulse strength of 7 percent. --------------------------------------------------------- Input length is 24 inches For 2nd harmonic, RPM range is from 4895 to 5940 with a pulse strength of 10 percent For 3rd harmonic, RPM range is from 3678 to 4203 with a pulse strength of 7 percent For 4th harmonic, RPM range is from 2867 to 3207 with a pulse strength of 4 percent ------------------------------------------------------------------------------------------------------------------------------ Now going to a Total runner length of 24" will move the power making benefit of the runner to the 2nd harmonic pulse of 4895 to 5940 with a pulse strength of 10 percent, so by doing that should put my engine in the power range on the leave at 4800 rpm & my trap rpm of about 6k fits with the 17" AND 24" runner, also the pulse is stronger on the 2nd harmonic.
So the longer runner should not hurt the big end at all. I had cut my runners to 17" so I could see over the air filters to drive on the street,.
Last edited by csk; 02/11/2004:22 PM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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