302 carb help - Page 2

Pesce Nero · 03-03-2009, 11:12 PM

initial timing needs to be 16 or higher. i would take the carb off, turn it upside down and set your throttle blades, alot of times the rear throttle blade are slam shut. set your throttle blades so that all you see of the transfer slot is a small square. small screw adjusts the rear blades. put it on the car. depending on how many A/F screws you have, turn them all the way in, and unscrew them 1 1/2 turns. start car. set A/F screws to highest vacum reading. if idle is to low, bump up timing. if you cant get idle rpm high enough, it needs more air. i would drill tiny holes in throttle blades, tiny!

do not tuch curb idle screw after you set throttle blades. another thing is, new gas sucks, reg pump gas doesnt have a set vapor temp compared to race fuel. race fuel will vaporize at say 100 degrees where pump gas might not till 400 degrees. engine needs to be good and warm before any real tuning could begin

BAD BOB · 03-03-2009, 11:16 PM

Damn EFI is easier

Pesce Nero · 03-03-2009, 11:19 PM

its not hard, i would have done all that in 1 minute before i ever bolted the carb on in the first place.

also, there could just be junk in the carb so it may need a kit

05Saleen · 03-03-2009, 11:19 PM

Not once you get used to it......I don't know shit about efi!
Other that it costs you an ass load of money to buy a hand held tuner and then take it to someone to tune it and that isn't cheap!

BAD BOB · 03-04-2009, 10:03 PM

got the rich idle issue figured out. Drove down the road for the first time and at around 2500-3000rpm i guess(dont have a tach yet) and it seems to be surging i guess a little rich? It has 65 jets in the front. It also does this when i stall it up to try to launch it. I have a wideband wondering if i should hook it up and adjust fuel that way? Any help here?

LXtasy · 03-04-2009, 10:17 PM

Do you have an adjustable fuel pressure regulator? What is the fuel pressure set to? I would set it around 5.5 psi and go from there.

Pesce Nero · 03-04-2009, 10:26 PM

surging usually means a lean condition. yes, if you have a wideband, hook it up

BAD BOB · 03-04-2009, 10:40 PM

Quote:

Originally Posted by LXtasy

Do you have an adjustable fuel pressure regulator? What is the fuel pressure set to? I would set it around 5.5 psi and go from there.

fuel pressure is around 4.5 to 5 and yes a adjustable regulator

BAD BOB · 03-04-2009, 10:44 PM

Quote:

Originally Posted by SIXPACKGUT

surging usually means a lean condition. yes, if you have a wideband, hook it up

ill hook it up tomorrow and see what it shows. Should i go bigger jets or fuel pressure?

Jeff · 03-05-2009, 12:13 AM

I would go up on the jets for sure ! My car never even ran right til I got over 75's on the carb with the 650 . It did all the things you are talking about surging and idle issues all the good stuff . When we threw Darryls AED 950 on the car with 81 jets all the way around it ran damn good !

BAD BOB · 03-05-2009, 08:51 PM

ok wideband shows when its wot its a little rich but can live with it right now but with throttle open a little like cruising around 2-3 grand it leans out to about 16.0-17.0. Any help??

Pesce Nero · 03-05-2009, 10:00 PM

go up primary jet and down on secondary jet

fixed

BAD BOB · 03-05-2009, 10:13 PM

going dowm on the primary jets wouldnt that make it leaner?

Pesce Nero · 03-05-2009, 10:27 PM

my bad, YES!! do the oppisite of what i said

fixed now

BAD BOB · 03-05-2009, 10:30 PM

ok So as everyone can tell i dont know much about carbs but at low rpms(cruising) it uses the primaries and under heavy load it uses both??

Robert Holton · 03-06-2009, 12:38 AM

i got idea pull your carburetor off, turn it over and throw it into the trash can, call 1-800-345-4545 and order a new one, listening to everybody and there brother and sister will just end u up in left feild, just stick with one guy, it may take time but eventually will get you in the right direction

slowgreen99 · 03-06-2009, 12:44 AM

2303030

03-03-2009, 11:12 PM	#21
Pesce Nero Senior Member Join Date: Jul 2008 Posts: 2,680	initial timing needs to be 16 or higher. i would take the carb off, turn it upside down and set your throttle blades, alot of times the rear throttle blade are slam shut. set your throttle blades so that all you see of the transfer slot is a small square. small screw adjusts the rear blades. put it on the car. depending on how many A/F screws you have, turn them all the way in, and unscrew them 1 1/2 turns. start car. set A/F screws to highest vacum reading. if idle is to low, bump up timing. if you cant get idle rpm high enough, it needs more air. i would drill tiny holes in throttle blades, tiny! do not tuch curb idle screw after you set throttle blades. another thing is, new gas sucks, reg pump gas doesnt have a set vapor temp compared to race fuel. race fuel will vaporize at say 100 degrees where pump gas might not till 400 degrees. engine needs to be good and warm before any real tuning could begin Last edited by Pesce Nero; 03-03-2009 at 11:16 PM.

03-03-2009, 11:19 PM	#24
05Saleen Senior Member Join Date: Dec 2006 Location: Goose Creek, SC Posts: 3,159	Not once you get used to it......I don't know shit about efi! Other that it costs you an ass load of money to buy a hand held tuner and then take it to someone to tune it and that isn't cheap! __________________ 05 Saleen, 91 Mustang LX, 99 Lightning Last edited by 05Saleen; 03-03-2009 at 11:24 PM.

03-04-2009, 10:17 PM	#26
LXtasy Senior Member Join Date: Dec 2006 Location: Summerville, SC Posts: 9,564	Do you have an adjustable fuel pressure regulator? What is the fuel pressure set to? I would set it around 5.5 psi and go from there. __________________

03-05-2009, 12:13 AM	#30
Jeff Senior Member Join Date: Feb 2007 Posts: 1,015	I would go up on the jets for sure ! My car never even ran right til I got over 75's on the carb with the 650 . It did all the things you are talking about surging and idle issues all the good stuff . When we threw Darryls AED 950 on the car with 81 jets all the way around it ran damn good ! __________________ Boat .

03-05-2009, 10:00 PM	#32
Pesce Nero Senior Member Join Date: Jul 2008 Posts: 2,680	go up primary jet and down on secondary jet fixed Last edited by Pesce Nero; 03-06-2009 at 01:01 AM.

03-03-2009, 11:16 PM	#22
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	Damn EFI is easier

03-04-2009, 10:03 PM	#25
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	got the rich idle issue figured out. Drove down the road for the first time and at around 2500-3000rpm i guess(dont have a tach yet) and it seems to be surging i guess a little rich? It has 65 jets in the front. It also does this when i stall it up to try to launch it. I have a wideband wondering if i should hook it up and adjust fuel that way? Any help here?

03-04-2009, 10:26 PM	#27
Pesce Nero Senior Member Join Date: Jul 2008 Posts: 2,680	surging usually means a lean condition. yes, if you have a wideband, hook it up

03-05-2009, 08:51 PM	#31
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	ok wideband shows when its wot its a little rich but can live with it right now but with throttle open a little like cruising around 2-3 grand it leans out to about 16.0-17.0. Any help??

03-05-2009, 10:13 PM	#33
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	going dowm on the primary jets wouldnt that make it leaner?

03-05-2009, 10:27 PM	#34
Pesce Nero Senior Member Join Date: Jul 2008 Posts: 2,680	my bad, YES!! do the oppisite of what i said fixed now Last edited by Pesce Nero; 03-05-2009 at 10:31 PM.

03-05-2009, 10:30 PM	#35
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	ok So as everyone can tell i dont know much about carbs but at low rpms(cruising) it uses the primaries and under heavy load it uses both??

03-06-2009, 12:38 AM	#36
Robert Holton Senior Member Join Date: Jul 2008 Posts: 978	i got idea pull your carburetor off, turn it over and throw it into the trash can, call 1-800-345-4545 and order a new one, listening to everybody and there brother and sister will just end u up in left feild, just stick with one guy, it may take time but eventually will get you in the right direction

03-06-2009, 12:44 AM	#37
slowgreen99 Senior Member Join Date: Jan 2008 Location: Summerville Posts: 7,740	2303030 __________________ M.R.E. Bad Bob Motorsports