Sean73 Posted May 3, 2006 Share Posted May 3, 2006 According to my wideband I'm running lean at 4000 RPM and 10 psi. My injectors are 480cc and have been flow tested. On boost I have my fuel maps set to 10:1 A/F for testing purposes. Regardless of how I program the maps, It leans to about 13:1 or more at above 4000 RPM. I'm thinking that my fuel pump is bad or inadequate. It's a MSD 2225. According to MSD, it should flow 45 gal/hr @ 60 psi and 13.5 volts. This should be plenty for my application (see sig). MSD does not take into account fuel filter restriction though which could make this specification lower. I have a bosch pump off a porsche that I can test, but I would like to hear of anyone having success or failures with the MSD pump. Thanks Quote Link to comment Share on other sites More sharing options...
Bernardd Posted May 4, 2006 Share Posted May 4, 2006 test it with a fp guage. ps. how's the sunburn? mines baad. hehe Quote Link to comment Share on other sites More sharing options...
dapiper Posted May 4, 2006 Share Posted May 4, 2006 Make sure pump is getting voltage. There may be large drop with stock wiring. Use relay with #10 wire direct to batt thru maxifuse. Quote Link to comment Share on other sites More sharing options...
Sean73 Posted May 4, 2006 Author Share Posted May 4, 2006 I did the old gauge on the windshield test, and it seemed ok. Yeah, sunburn and tired. It was a great weekend at MSA. I wanted to go pound a few beers with you later but I was just wiped out. Quote Link to comment Share on other sites More sharing options...
speeder Posted May 4, 2006 Share Posted May 4, 2006 I use the MSD 2225 - It will make up for a lack of pump capacity, up to a point. If your fuel pressure is reading base setting + boost in the high load areas, though, I would say that you should look somewhere else. At 10 psi you should not be maxing out the 460cc injectors.... What fuel management are you using? Never mind - just went back and looked at your sig. Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted May 12, 2006 Share Posted May 12, 2006 Are you hitting the metering limit of the AFM? I have a 2225 in my car with no problems at my power level, but I am running a LP pump/surge tank to supply the high pressure pump. That may make a difference as it doesn't have to suck the fuel up out of the tank, it has positive head pressure on the inlet. Doug Quote Link to comment Share on other sites More sharing options...
Pyro Posted May 15, 2006 Share Posted May 15, 2006 What is your fuel pressure at 10 psi of boost???? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.