im boostin 6psi soon on my f22, and i got the apexi safc and 440cc's...but im worried about the timing, i was wanting to use the universal msd btm, but ive heard that it has problems wit the afc hack..so what do you recommend? people have told me since im runnin only 6psi to retard at the distributor...

https://www.homemadeturbo.com/forum/...threadid=21747 ive read thru that whole thing...and ive come to the conclusion that btm only retards in boost, but when you're not in boost, the btm does not retard thus your timing is advanced, and thats where some problems lay..

maybe i should just retard at the distributor... but then u lose low end power, and u cant retard as much when u're in higher boost. retarding at the dizzy does however retard even when the turbo is not boosting, so thats good

iono im confused...help?!

Thanks in Advance for any replies!!

Adam

 

anyone got anything?

 

Nope...
The thing is..the AFC hack moves the ignition table in a way that right after the vacume to boost transition your timing will be like when you're car is at the lowest vacume and if you look at the table you'll see that your timing is then 30-40+ degree.
There is not that can help you with that...there are a lot of people running the hack for a long time.....but if you are really peranoid don't use it.

 

so what do you think about retarding at the dizzy

 

so people just run on the hack without really retarding there ignition is what your saying right Semnos

 

so...some people run the afc hack without even touching the timing and it runs fine?

if not using the btm, wouldnt you try to retard in the distrib?

whats better retarding in the distrib or not touching it at all

 

well common sense would tell you that retard at dizzy > no retard at all. If I were you, I would look into chipping my ecu rather than rely on that safc.

 

yeah i think with the F22 that youre gonna need some retard, probably at least .5 degree/lb, some people run no retard to about 10 psi on D series but F series is not D series... how much boost do you wanna run?

 

i said 6psi..ill prob let the tuner take care of it wit the timing..all i kno is im probably not gonna use the btm..

if i just didnt have this AT, cuz if i had a manual id use a civic ecu and chip that...but ive never heard of anyone chipping the AT ecu's on my engine yet..

 

low boost + afc hack = mega advanced timing.

at that low of boost, use an FMU or something so you wont have a problem with timing.

If you're going to run the AFC hack, run 9psi + or nothing at all.