bin. selection
Thread Starter
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
bin. selection
Burning my first chip I selected the arap bn. as a start point. I have always been a little worried about the agressive spark table of this bin. Bmbl Bee is somewhat modified,TFS heads and 10:1 CR and a very slightly bigger cam, a DD and never raced. Though she runs well would it be to my overall advantage to go to something like the apyp bin. or even the aujm. As I compare these to each other spark management seems to be the major difference. I should add that even though I can burn a chip I am not,at this point at least, entirely comfortable making wholesale changes in a bin. Rather sneak up on something that works well. Any comments and suggestions from you old hands is appreciated.
Instructor
Joined: Sep 2003
Posts: 109
Likes: 0
From: Ft. Lauderdale FL
Originally Posted by Muffin
Burning my first chip I selected the arap bn. as a start point. I have always been a little worried about the agressive spark table of this bin. Bmbl Bee is somewhat modified,TFS heads and 10:1 CR and a very slightly bigger cam, a DD and never raced. Though she runs well would it be to my overall advantage to go to something like the apyp bin. or even the aujm. As I compare these to each other spark management seems to be the major difference. I should add that even though I can burn a chip I am not,at this point at least, entirely comfortable making wholesale changes in a bin. Rather sneak up on something that works well. Any comments and suggestions from you old hands is appreciated.
Not knowing what you are running, I am confused in your bin references- ARAP is for an MAF Auto car but APYP is for a MAF manual car. Both of those Bins use a very aggressive timing table which I do not like. Your best bet is to initially reduce all the values in those timing tables and slowing work the curves back up, giving the engine what it wants. Detonation will be a major problem if you leave them as is and get on it, especially with a 10:1 engine. Your "slightly bigger cam" may change the engine's behavior or tolerance for detonation. I run a 10:1 iron headed engine with no problems- but I worked on the timing alot.
Anyway, I am a little south of you, but always available to try to help...Good Luck.
