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Pfc Tuning Question

j2fast

By j2fast,
in Engines & Forced Induction

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j2fast Enthusiast

j2fast

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i have for some time been looking at the Dwell ign VS rpms in the PFC for my rb25 motor but i don't know if i should are is it necessary for my motor with mods to mess with it. the mods are t76 turbo, all bolts on, 1000cc injectors, 2 fuel pumps running e85. so i know that timing will need to be up a lil more just from using e85 but don't know much about it. if anyone is an experience tuner with this please shine some light on it for me.

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Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
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I personally haven't, but I say on full load, row 16 on your map reads 17 15 13 13 13 13 13 14 14 15, e85 will allow more advanced timing so it "could" be like 21 19 17 17 17 17 17 17 17 118 18 , etc....

you get the ideal.

STATUS Grand Master

STATUS

Posted
Posted
  j2fast said:
i have for some time been looking at the Dwell ign VS rpms in the PFC for my rb25 motor but i don't know if i should are is it necessary for my motor with mods to mess with it. the mods are t76 turbo, all bolts on, 1000cc injectors, 2 fuel pumps running e85. so i know that timing will need to be up a lil more just from using e85 but don't know much about it. if anyone is an experience tuner with this please shine some light on it for me.

what coils? i have a few good setups.

j2fast Enthusiast

j2fast

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Posted
  johnnilicte said:
I personally haven't, but I say on full load, row 16 on your map reads 17 15 13 13 13 13 13 14 14 15, e85 will allow more advanced timing so it "could" be like 21 19 17 17 17 17 17 17 17 118 18 , etc....

you get the ideal.

naw on e85 mines like 55 55 55 55 55 48 48 48 42 42 42 40 40 35 with no knock and while i was on the dyno i was gaining hp but i stopped adding cuz i thought that was pretty high

rob82 Mentor

rob82

Posted
Posted
  j2fast said:
naw on e85 mines like 55 55 55 55 55 48 48 48 42 42 42 40 40 35 with no knock and while i was on the dyno i was gaining hp but i stopped adding cuz i thought that was pretty high

The knock resistance of E85 is quiet high and on most setups you can run virtually whatever ignition curve you want without knock. However there is absolutely no point going further than MBT as you will cause combustion gases to act on everything within the chamber for longer. E85 tuning really needs to be done on the dyno to find MBT.

paulr33 Grand Master

paulr33

Posted
Posted

MBT(Minimum advance Best for Torque)

The ideal ignition timing to produce maximum torque for a given load and engine RPM. Applying this value for every stage would be extremely efficient and minimize load on the engine while driving.

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