Is 15 degrees timing advance at 15lbs too advanced?
well the line was going to get up there if it continued like its supposed to. if you ignore the 459 it was still around 440 rwhp.... the lowest dyno chart i have is 380rwhp. either dyno's are a complete farce. i have no idea. the car did make the power on the dyno. it was breaking up and actually made the pull. when i was on the track i was probably using 380-390 rwhp after continually messing with my maps to get rid of my breakup. i finally did then i got in an accident with my car. i have said it before. ah well **** happens. 2k4 will be my year i swear 
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Joined: Jun 2001
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From: Austin, TX
Nice post!
This is how all of the "no BS" tuners I've spoken to dial in a car's EMS.
This is how all of the "no BS" tuners I've spoken to dial in a car's EMS.
Originally posted by rotor_dee
Unfortunately timing is not cut and dry but there are some good rules of thumb to start with.
For example 12 deg is a good starting point for a base map and I do not feel 15 deg is totally overkill.
You must be careul with some EFI systems because 15 deg isn't always actually 15deg. Be sure to follow the procedures for your system and "zero the timing" or verify what your motor sees when the ecu is set to zero.
I have seen some engine management systems have a 2-5 degree variance under high rpm so this will have to be accounted for also.
A good test for timing is:
First tune the car with a conservative timing settings. Once the A/F is right now is the time to get out your egt guage and verify your timing. If you advance your timing and your egt's are reasonbable and you pick up power your advance in timing was the correct move. If you egt's go up and you loose power it was a wrong move. The same can be applied in reverse. If you pull timing out and make more power the retarding of your timing was a good move.
Demetrios
P.S All the above should be performed by a professional
Unfortunately timing is not cut and dry but there are some good rules of thumb to start with.
For example 12 deg is a good starting point for a base map and I do not feel 15 deg is totally overkill.
You must be careul with some EFI systems because 15 deg isn't always actually 15deg. Be sure to follow the procedures for your system and "zero the timing" or verify what your motor sees when the ecu is set to zero.
I have seen some engine management systems have a 2-5 degree variance under high rpm so this will have to be accounted for also.
A good test for timing is:
First tune the car with a conservative timing settings. Once the A/F is right now is the time to get out your egt guage and verify your timing. If you advance your timing and your egt's are reasonbable and you pick up power your advance in timing was the correct move. If you egt's go up and you loose power it was a wrong move. The same can be applied in reverse. If you pull timing out and make more power the retarding of your timing was a good move.
Demetrios
P.S All the above should be performed by a professional
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