DSMReviver
15+ Year Contributor
- 1,134
- 77
- Mar 4, 2008
-
Little Rock,
Arkansas
I am running staged injection based upon boost level with the secondaries transitioning in around 6-10psi with AEM EMS. The secondary fuel pumps (in-tank/in-line system) are also controlled by the AEM EMS by wiring in the ground wire for the secondary system relay to a low switch pin that was not used (in my case, pin 9 for EGR system was used).
The primary injectors currently are FIC Bluemax 1350cc and the secondaries were Bosch 1600's. I will swap out the Bosch junk for a set of FIC Bluemax 1750's as they will be smoother to control on the initial ramp-in of the secondary injectors under boost.
As for running out of fuel....The 835AWHP was done on only the 1350cc injectors and one in-tank/in-line pump combo (two pumps on one feed line) at 46psi on Q16. This was where I calculated the limitations to be at a safe duty cycle of 90% prior to tuning with a 43psi base pressure (actually 825AWHP was what I was expecting). So, my numbers were within 0.4%-1.6% target value of what I calculated based upon the correction factor (817AWHP Uncorrected, 822AWHP SAE, 835AWHP STP). At my boost levels, I was at 90psi line pressure. I am sure you could eek more out of the system as I was only on a 43psi base pressure and 46-47psi boost pressure, and the pump combo can easily handle above 120psi line pressure in my configuration on a 12-14V power supply. The secondaries were not even tuned in because we were dealing with a dead #4 injector and didn't want to waste time trouble shooting if it was clogged or if it ohmed out good or failed, so we just ran on the primaries.
Effectively, the 1350cc injectors and twin pumps are at their safe upper limits at 825AWHP on a good electrical system. Keeping good voltage is so important with power levels and fueling.
The 1600 secondaries alone should be able to handle around 980AWHP on gasoline with a safe duty cycle, and the FIC BlueMax 1750's should handle around 1065AWHP alone on gasoline.
With 1350 primaries and 1750 secondaries on the quad pumps on E98 it should be able to handle around 1150-1200AWHP, while on gasoline it would be able to handle around 2000AWHP. We all know I will never run more than 1100AWHP, so it is just a large buffer of having overkill for my setup on race gas, and at the right limits on straight E98.
Wow, good to know you are okay for 2000awhp. .
what are the benefits to the secondary injectors?
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