347 very lean!!!
04-27-2008, 01:04 PM
#1
Thread Starter
Join Date: Apr 2008
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Posts: 27
347 very lean!!!
I was wondering if anyone could help me ingetting my car not to be so lean. I have a 347 motor, AFR 185 x 58cc heads, 4018 cam, #30 injectors, adj. fuel pressure reg., 76mm mass air, 75mm throttle body and spacer, trick flow street heat upper and lower intake manifolds, 1 5/8" equal length headers, x-pipe, dynomax cat-back, and an aluminum flywheel. It's only making 260 rwhp wich I feel is pretty low and the air/fuel ratio reads about 18. Any help with this would be great. It's a 93. Any other info needed just let me know.
04-27-2008, 02:48 PM
#2
5th Gear Member
Join Date: Jun 2005
Location: San Diego, CA
Posts: 3,315
RE: 347 very lean!!!
check the fuel pump, sounds like its not NEARLY up to par for the setup
A 260rwhp is more of an Intake, cam, and ported E7 setup, you should be making at LEAST 330 RWHP
B IIRC running the engine that lean can be very VERY bad, dont run it until you find out whats wrong, like i said, get a much bigger fuel pump if hou havent already, if you have, check the lines
A 260rwhp is more of an Intake, cam, and ported E7 setup, you should be making at LEAST 330 RWHP
B IIRC running the engine that lean can be very VERY bad, dont run it until you find out whats wrong, like i said, get a much bigger fuel pump if hou havent already, if you have, check the lines
04-27-2008, 04:34 PM
#6
D.R. THE PATHETIC DORK
Join Date: Jun 2007
Location: West Virginia
Posts: 30,863
RE: 347 very lean!!!
ORIGINAL: sushi214
My fuel pressure is set at 40lb. I have #30 injectors. Through all rpms the pressure stays up at 40. I have the stock pump in there but if it is reading 40lbs it should be good right?
My fuel pressure is set at 40lb. I have #30 injectors. Through all rpms the pressure stays up at 40. I have the stock pump in there but if it is reading 40lbs it should be good right?
......88 lph is what stock pump delivers..just cause pressure is on doesn't mean volumne is the two do not parrallel one another...get a 255lph pump and try again and 260 for a 347 down right sucks.......that thing when tuned right better put out 350+ rwhp and closer to 400 if parts are matched
04-27-2008, 04:55 PM
#7
Thread Starter
Join Date: Apr 2008
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Posts: 27
RE: 347 very lean!!!
thank you very much. yes i am very disapointed in the 260. What i was hoping for was closer to 400. Ill be happy with high 3 right now though. Just adding the pump should help out a lot yeah? I am also thinking about getting a custom chip made up for it too. I had no idea the volume and pressure were two completely different things. As far as the pump goes should I go in-tank or in-line. Any brand better then the other or a fuel pump is a fuel pump?
04-27-2008, 05:06 PM
#10
Thread Starter
Join Date: Apr 2008
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Posts: 27
RE: 347 very lean!!!
Timing is good and MAF is calibrated. Thank You again, will let you know how it works out. Well just looking I saw summit, bbk, trick flow as well. The #30 should be plenty big enough too right?