I'm posting this in the general discussion because it will be easier for more to see. Decided to try out 900CC? Modified stock injectors to run E85 on a stock 2013 R spec (experimental reasons for the future) Unfortunately the BK2 2.0 can't use standard upgrades due to impedance. Removing the fuel rail was easy, 2 10mm bolts and a vacuum hose needed to be moved. The injector clips were tricky as they reverse clip in. Takes odd pressure point to slide the loose. After removing the old ones I lubed the new o rings on both sides and set the rail back in. Reconnected wires and turned key to ON to prime rail. I heard it fill then turned it back off. Checked for leaks and luckily none First start on E50 was smooth albeit quite loud. The stock ecu O2 is a lamda sensor and adjusted AFR very quickly to get to stoich. I regret not getting the old and new flow tested but I was able to see the trims via the torque app. At idle the ECU was pulling 10% and long term it was pulling 4% During driving the AFR targets were spot on compared to my stock logs on pump gas. The boost spike at 3k RPM actually added 5% more injector duty. Completed 2 tanks then tried E80 which is what we measured locally. After startup fuel trims were adding extra fuel to reach stoich. 5% at idle and 13% long term. At 3KRPM it added 13% extra to reach .78 lamda again but got even richer during shifts at 6500. Saw 10.1 and 9.9 AFR's a couple times (.72 lamda) No stalls or misfires but I was disappointed. I know our car has knock sensors but it didn't adjust timing a single bit at all. I figured it would be progressive and add or reduce depending on what octane the engine sensed. Am I missing something? Anyways this gives me confidence in the stock fuel system to run 300 to 450hp without maxing anything out. Fuel pump seems to do quite fine for now. I can now run E10 to E70 comfortably and the ECU adjusts within 15 minutes of driving to exactly how much fuel is needed. I like to run an 8 gallon mix of 93 and E85 to get about E55 right now. Seems to be a good match as the fuel trims are pulling within 1% short and long term. Not sure how cold starts will be but we shall see in the winter. Only once I had to tap the gas after it cranked 2 secs and didn't start. My only complaint is the noise and new spray pattern compared to stock (5 tiny pinholes vs bored out). Not a deal breaker but if anyone else needs to upgrade I'd say go for it.
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