Fuel trims with meth injection

bluedemon_II · 06-29-2008, 08:57 PM

So I decided to start editing my fueling tables again and for my surprise the data log showed that I was running 10.9- 11.00 A/F while the meth system was active. I know if I lean out the mixture a little more, lets say 11.6 to 11.8 I could find some more power out of it. The ting is that i was debating if I should take the readings in lambda or in A/F. Since meth isn't really gasoline well the A/f could get a little tricky. Around what A/f's do you guys run while meth injection is on? The wideband is an LC-1. I'm going to go to the dyno to keep on tweaking my map.

LittleBlueGT · 06-30-2008, 06:10 AM

Because most people don't inject that much meth (or maybe a 50/50 alky mix?) I wouldn't worry about Lambda.

If you are injecting between 400-750 cc/min of anything from 25/75 to 75/25 I would just target around 11.5:1 and then lean out from there w/ testing.

Currently I run 550 cc/min of 50/50 and run about 11.9:1 (as read by the WBO2). I have gone as much as 12.2, but didn't really notice a power difference, so I went back to a fairly safe 11.9:1.

06-29-2008, 08:57 PM	#1
bluedemon_II Grassroots STI Racer Car: 04 Sti Wrb on Silver Location: Hatillo, Puerto Rico Posts: 501 Join Date: Jul 2007 Trader Rating: (0)	Fuel trims with meth injection So I decided to start editing my fueling tables again and for my surprise the data log showed that I was running 10.9- 11.00 A/F while the meth system was active. I know if I lean out the mixture a little more, lets say 11.6 to 11.8 I could find some more power out of it. The ting is that i was debating if I should take the readings in lambda or in A/F. Since meth isn't really gasoline well the A/f could get a little tricky. Around what A/f's do you guys run while meth injection is on? The wideband is an LC-1. I'm going to go to the dyno to keep on tweaking my map. This ad is not endorsed by this member. Please register or login to hide this ad.

06-30-2008, 06:10 AM	#2
LittleBlueGT Amateur STI Driver Car: 05 Subaru LGT Fav Mod: Coming Soon Location: Winnipeg Posts: 39 Join Date: Oct 2007 Trader Rating: (0)	Re: Fuel trims with meth injection Because most people don't inject that much meth (or maybe a 50/50 alky mix?) I wouldn't worry about Lambda. If you are injecting between 400-750 cc/min of anything from 25/75 to 75/25 I would just target around 11.5:1 and then lean out from there w/ testing. Currently I run 550 cc/min of 50/50 and run about 11.9:1 (as read by the WBO2). I have gone as much as 12.2, but didn't really notice a power difference, so I went back to a fairly safe 11.9:1. This ad is not endorsed by this member. Please register or login to hide this ad.