My dyno graph . need help anylizing.
10-14-02, 12:04 AM
#1
Rotary Freak
Thread Starter
My dyno graph . need help anylizing.
This A/F chart boggles my mind. Someone tell me if it looks normal for a stock tuned car. I have no advance timing nor headers.
The car gets really rich (for an N/A) between 5 and 6 thousand rpms. Then it has this lean spike between 6 and 7. Then after 7 it plumats downward reaching around 11:1 A/F ratio at 8k. Its a nice even rollercoaster looking a/f ratio. Lots of ?s on it. Im looking forowered to a 14-14.5 A/F ratio that slvr7 has used as well as pp13bnos BUT when I leaned the AFC out (just to see the changes but not to officialy tune) to - 15% from 5.5-8.5k the original A/F ratio spike went up to 14 but nothing else did. So the other rpms were not effected. Just that spike. Jeff the dyno guy said that if I tune it at 5.5 only the car will actually have a delay on the a/f numbers so mabey that was it. BUT even with -15% the A/F still drops downward at 7.2k rpms on down. So I can richen it up even further. So far the S-AFC has given me only 2rwp tops at that peak level But the peak level has also raised in the RPM band and also does not drop off as much with the tunning.
As you can see that 7k rpms at -15% raised the bar from 13.0 to 14.0 A/F raising it 1 point even. So if 1 point equals -15% then -7% = .5 points and 4% = 2% so looking at the A/F chart say 5.5k rpms is 12.6 A/F so thats 1.4 points away from 14. Does this mean that I would be adding -15+ -7 = -22 points to = a 14.0 A/F ??? Isnt this the way it works ??? My estimations are on the graph.
Another ?. Why on the second run (red) did I lose power and torque when the S-AFC wasnt even tuned in those rpm bands? The dyno is accurate. Its brand spanking new and thier hasnt been to many people in from of me.
Another interesting fact is that my Torque seems to peak way heigher than anyone elses I have seen. At 6100 rpms it peaks with leaning it out more. Its funny but someone told me that richening it up makes more torque? After I get headers I will dyno it again. Then with the timing. Then with other things like TB porting and more S-AFC tuning within the weeks. Ill keep posted as long as people ansewer some of my ?s. Thnx alot for reading. Ask any ?s you like but everythings already stated I think.
Please help anylyze my A/F ratio (Dyno results) pp13bnos?Slvr7?
The car gets really rich (for an N/A) between 5 and 6 thousand rpms. Then it has this lean spike between 6 and 7. Then after 7 it plumats downward reaching around 11:1 A/F ratio at 8k. Its a nice even rollercoaster looking a/f ratio. Lots of ?s on it. Im looking forowered to a 14-14.5 A/F ratio that slvr7 has used as well as pp13bnos BUT when I leaned the AFC out (just to see the changes but not to officialy tune) to - 15% from 5.5-8.5k the original A/F ratio spike went up to 14 but nothing else did. So the other rpms were not effected. Just that spike. Jeff the dyno guy said that if I tune it at 5.5 only the car will actually have a delay on the a/f numbers so mabey that was it. BUT even with -15% the A/F still drops downward at 7.2k rpms on down. So I can richen it up even further. So far the S-AFC has given me only 2rwp tops at that peak level But the peak level has also raised in the RPM band and also does not drop off as much with the tunning.
As you can see that 7k rpms at -15% raised the bar from 13.0 to 14.0 A/F raising it 1 point even. So if 1 point equals -15% then -7% = .5 points and 4% = 2% so looking at the A/F chart say 5.5k rpms is 12.6 A/F so thats 1.4 points away from 14. Does this mean that I would be adding -15+ -7 = -22 points to = a 14.0 A/F ??? Isnt this the way it works ??? My estimations are on the graph.
Another ?. Why on the second run (red) did I lose power and torque when the S-AFC wasnt even tuned in those rpm bands? The dyno is accurate. Its brand spanking new and thier hasnt been to many people in from of me.
Another interesting fact is that my Torque seems to peak way heigher than anyone elses I have seen. At 6100 rpms it peaks with leaning it out more. Its funny but someone told me that richening it up makes more torque? After I get headers I will dyno it again. Then with the timing. Then with other things like TB porting and more S-AFC tuning within the weeks. Ill keep posted as long as people ansewer some of my ?s. Thnx alot for reading. Ask any ?s you like but everythings already stated I think.
Please help anylyze my A/F ratio (Dyno results) pp13bnos?Slvr7?
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