I need help.
I have a new 408 mopar magnum that we cannot get the tune right.
Edelbrock heads 10.1 compression
Cam is a fast ramp .220 duration factory rollers
Edelbrock intake ( this replaces the factory barrel, so I can use the complete factory injection)
Shorty headers into stock exhaust.
30 lb injectors--Accell
Problem.
We have tried 6 tunes so far.
It goes very lean off idle , and into surge. 14.5 to 15 to 1 at idle and cruise but as soon as the converter is starting to get a load it leans out to 18-19 to one.
Cam sync set to zero and to +7 No change
Every sensor has been replaced with no changes in performance.
This includes TPS , MAP, IAC, Cam signal plate.
It is currently returned to stock--injectors and programming.
It still has the lean off ile but not as pronounced.
(it is not as snappy either!)
We have added as much as 30% more fuel and it still does it. ( on top of the injectors)
It will go rich to 11.5 at full throttle 3k to 6k rpm and makes great power.
This can't be this tough!!
I'm missing something, help!
Today I plan to swap out the TB, I have two, both stock.
Plugs are staying white.
Gas is 91 octane.
John
I have a new 408 mopar magnum that we cannot get the tune right.
Edelbrock heads 10.1 compression
Cam is a fast ramp .220 duration factory rollers
Edelbrock intake ( this replaces the factory barrel, so I can use the complete factory injection)
Shorty headers into stock exhaust.
30 lb injectors--Accell
Problem.
We have tried 6 tunes so far.
It goes very lean off idle , and into surge. 14.5 to 15 to 1 at idle and cruise but as soon as the converter is starting to get a load it leans out to 18-19 to one.
Cam sync set to zero and to +7 No change
Every sensor has been replaced with no changes in performance.
This includes TPS , MAP, IAC, Cam signal plate.
It is currently returned to stock--injectors and programming.
It still has the lean off ile but not as pronounced.
(it is not as snappy either!)
We have added as much as 30% more fuel and it still does it. ( on top of the injectors)
It will go rich to 11.5 at full throttle 3k to 6k rpm and makes great power.
This can't be this tough!!
I'm missing something, help!
Today I plan to swap out the TB, I have two, both stock.
Plugs are staying white.
Gas is 91 octane.
John