Previous Thread
Next Thread
Print Thread
AFB gurus for a 528 hemi build #754958
07/22/10 08:23 AM
07/22/10 08:23 AM
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
F
fig426 Offline OP
top fuel
fig426  Offline OP
top fuel
F

Joined: Jan 2004
Posts: 2,103
East Coast, NJ
I'm almost done with the 528 hemi build. It's 10:4 comprssion, 295, 630 lift cam, 4000 stall,727 foot brake, 430 gear, 3900 lbs, 29" tires. Strip only car. I'm using dual factory 1970 hemi AFB's. Any suggestions for a baseline on the carbs?


Chris from New Jersey
Re: AFB gurus for a 528 hemi build [Re: fig426] #754959
07/22/10 01:38 PM
07/22/10 01:38 PM
Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
Cudajon Offline
pro stock
Cudajon  Offline
pro stock

Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
One persons absolute greatest baseline can be anothers POS. But here is what I had. Primary carb. Primary jets. .95 second 86. orange springs in the metering rods .071 X .047 metering rods accel pump in first hole next to carb (max shot at hit of throttle) .110 needle and seat. Secondary carb .98 primary jets .89 second orange springs .0705 X .0475 rods accel pump in middle hole .110 needle and seat. HOWEVER, if you are not running progressive linkage I don't know where to go.

Re: AFB gurus for a 528 hemi build [Re: Cudajon] #754960
07/24/10 11:31 AM
07/24/10 11:31 AM
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
F
fig426 Offline OP
top fuel
fig426  Offline OP
top fuel
F

Joined: Jan 2004
Posts: 2,103
East Coast, NJ
Thanks Cudajon. Any other suggestions?


Chris from New Jersey
Re: AFB gurus for a 528 hemi build [Re: fig426] #754961
07/24/10 11:54 AM
07/24/10 11:54 AM

A
Anonymous
Unregistered
Anonymous
Unregistered
A



which intake are you using, think that jetting will be way too lean for your combo.

Re: AFB gurus for a 528 hemi build #754962
07/25/10 08:39 AM
07/25/10 08:39 AM
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
F
fig426 Offline OP
top fuel
fig426  Offline OP
top fuel
F

Joined: Jan 2004
Posts: 2,103
East Coast, NJ
Quote:

which intake are you using, think that jetting will be way too lean for your combo.



Factory 70 aluminum inline dual 4 with the plenums and ports opened up.


Chris from New Jersey
Re: AFB gurus for a 528 hemi build [Re: fig426] #754963
07/25/10 10:51 AM
07/25/10 10:51 AM
Joined: Jan 2003
Posts: 3,103
Phila Pa
S
scatpacktom Offline
master
scatpacktom  Offline
master
S

Joined: Jan 2003
Posts: 3,103
Phila Pa
I would inquire with Dave Dudek if I were you. He has a pretty good grasp on jetting a hemi that has had its intake monkied with

Re: AFB gurus for a 528 hemi build [Re: scatpacktom] #754964
08/25/11 12:53 PM
08/25/11 12:53 PM
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
F
fig426 Offline OP
top fuel
fig426  Offline OP
top fuel
F

Joined: Jan 2004
Posts: 2,103
East Coast, NJ
I talked to Dave a while ago and he didn't have any similar setups. Super nice guy though. Anyone else running a similar combo? I'm running pump 93 (10% alcohol) and having trouble reading the plugs. I have in what Cudajon put up. Best so far is 11.44 at 115 mph. 1.577 60 foot. Caltracs, monoleaf, rancho shocks on 7. Shifting at 6000, going through the traps at 5900. 3900lbs with me in it (estimate).

6794480-0805111526.jpg (58 downloads)
Last edited by fig426; 08/25/11 12:57 PM.

Chris from New Jersey
Re: AFB gurus for a 528 hemi build [Re: fig426] #754965
08/25/11 02:01 PM
08/25/11 02:01 PM
Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
Cudajon Offline
pro stock
Cudajon  Offline
pro stock

Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
I failed to mention I run an Autometer O2 gage in my car set to record the AFR on runs. It sure helps tweeking the AFR. 11.44 aint bad for a 2 ton car. But I think your mph is low; however if 6k is the rpm goal and your trapping at 5900 you don't have a lot of leighway there.

Re: AFB gurus for a 528 hemi build [Re: Cudajon] #754966
08/25/11 04:49 PM
08/25/11 04:49 PM
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
F
fig426 Offline OP
top fuel
fig426  Offline OP
top fuel
F

Joined: Jan 2004
Posts: 2,103
East Coast, NJ
6k isn't really the goal, it's just where I have been shifting at. The rev limiter is set at 7000 and I've hit that in the burnout box. It sounded good up to the limiter. I'll shift higher or lower, but I need to get some more fuel in it so I was wondering if anyone else had a similar setup and what their jetting is. Your jetting got me up and running but it's definately lean in my setup.


Chris from New Jersey
Re: AFB gurus for a 528 hemi build [Re: fig426] #754967
08/25/11 09:27 PM
08/25/11 09:27 PM
Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
Cudajon Offline
pro stock
Cudajon  Offline
pro stock

Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
OK great. Change the metering rods to something smaller. Its easy and quick. If the et or mph improves your going the right way. Dont worry about the springs at wot there not doing anything. If the et picks up then change the jets a couple of sizes richer. I normally rejet the secondary carb first and see what happens. The primary carb if its too rich will cause a stumble. If the secondary handles it ok then do the primary. My HEMI really liked to be lean, I was always amazed that the tailpipes were a very light gray. 11.94 @ 119. 3:55 gears 68 RR. .30 over 426. I was happy.

Re: AFB gurus for a 528 hemi build [Re: Cudajon] #754968
08/27/11 03:16 PM
08/27/11 03:16 PM
Joined: Mar 2004
Posts: 2,475
SW Ohio
C
cgall Offline
top fuel
cgall  Offline
top fuel
C

Joined: Mar 2004
Posts: 2,475
SW Ohio
Fig, Dirk Hale is a wizard with those. RBDuster should have his number.

Re: AFB gurus for a 528 hemi build [Re: fig426] #754969
08/28/11 12:34 AM
08/28/11 12:34 AM
Joined: Aug 2003
Posts: 43,097
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 43,097
Bend,OR USA
Quote:

Quote:

which intake are you using, think that jetting will be way too lean for your combo.



Factory 70 aluminum inline dual 4 with the plenums and ports opened up.


Can you post a picture of the intake with the mods? I use to run stock street hemi years ago, maybe the jetting we used might give you a good place to start with I do know another NHRA racer that has ran the street Hemi in stock and SS that has set the record once or twice with his car, maybe he will share if I call him Post a picture and let see how it is modded Or send it9the picture) to my E mail address cabburge@wans.net


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: AFB gurus for a 528 hemi build [Re: Cab_Burge] #754970
08/28/11 12:41 PM
08/28/11 12:41 PM
Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
Cudajon Offline
pro stock
Cudajon  Offline
pro stock

Joined: Jan 2003
Posts: 1,436
Oklahoma City OK
You say the intake has been opened up. Is it the Vanke mod? Seems they liked a 1" carb spacer to really pick up. Of course hood clearance was an issue but most had hood scoops.

Re: AFB gurus for a 528 hemi build [Re: Cudajon] #754971
08/28/11 09:47 PM
08/28/11 09:47 PM
Joined: Jan 2004
Posts: 2,103
East Coast, NJ
F
fig426 Offline OP
top fuel
fig426  Offline OP
top fuel
F

Joined: Jan 2004
Posts: 2,103
East Coast, NJ
I don't have a pic, but it is the Vanke mod and gasket matched. I'll have to see if I have room for spacers.


Chris from New Jersey






Powered by UBB.threads™ PHP Forum Software 7.7.1