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Carb Accelerator Pump Tuning Question
#326743
05/23/09 11:25 PM
05/23/09 11:25 PM
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Joined: Jan 2003
Posts: 1,221
Jarrettsville, MD
tywebb2
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 1,221
Jarrettsville, MD
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I have been wrestling with tuning my 825 Mighty Demon for a while now (in hopes of making it to the track this month?). I have a pink cam in the primary and green in the secondary with 35 squirters. Cruising down the road I floor it for WOT#'s and I get a short trough in my AFR graph that dips down into the mid 10's. Would you say that means I should drop the squirters back to the stock 31's or switch back to the more gradual pink cam on the secondaries....or something else?
By the way...any opinions out there on what WOT and idle (in drive) AFR#'s I should be shooting for. I think I am close with 13.0-13.2 WOT and 13.8-14.2 @ idle in drive.
'72 440 Cuda
11.673 @ 115.91 w/1.663 60'
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Re: Carb Accelerator Pump Tuning Question
[Re: tywebb2]
#326744
05/24/09 05:44 AM
05/24/09 05:44 AM
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Joined: Jan 2003
Posts: 9,982
Ansonia, CT
CJK440
master
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master
Joined: Jan 2003
Posts: 9,982
Ansonia, CT
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With a quick stab of the throttle to WO, the overload spring in the pump linkage compresses while the diaphram "catches up" so the cam change won't show much change if at all on your meter. Drop the squirters down and see what happens.
In the end its all how the car behaves.
2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
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Re: Carb Accelerator Pump Tuning Question
[Re: Cab_Burge]
#326747
05/24/09 02:50 PM
05/24/09 02:50 PM
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Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
67HEMI
super stock
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super stock
Joined: May 2008
Posts: 902
Mopar Lane,Mississippi
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My car seems to have the best performance at 12.6 to 12.8 in the lights.
'33 Plymouth 5 Window Coupe Blown Aluminum HEMI w/bolt ons (under construction)
'69 Chrysler 300 Convertible 375 HP 440
'71 Plymouth Duster 360 W/EFI (Wife's Ride)
'12 Ram MegaCab Dually 6.7 Cummins
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Re: Carb Accelerator Pump Tuning Question
[Re: 67HEMI]
#326748
05/24/09 10:26 PM
05/24/09 10:26 PM
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Joined: Jan 2003
Posts: 1,221
Jarrettsville, MD
tywebb2
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 1,221
Jarrettsville, MD
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I tried the 31 squirters today and they seemed to help. I will probably put the pink cam pack on the secondary side as well because there is still a little dip down to a low 11..but not bad at all. Wouldn't even notice it if I didn't have the laptop hooked up to it. I also bumped my HSAB's down to .034 from.039 today and that got my WOT to 12.6-12.9 (started in 14-15 range before timing, jet, and hsab change)so I think I am ready for the track now 
'72 440 Cuda
11.673 @ 115.91 w/1.663 60'
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Re: Carb Accelerator Pump Tuning Question
[Re: Georg]
#326751
05/25/09 08:33 AM
05/25/09 08:33 AM
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Joined: Jan 2003
Posts: 1,221
Jarrettsville, MD
tywebb2
OP
super gas
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OP
super gas
Joined: Jan 2003
Posts: 1,221
Jarrettsville, MD
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I have the Zeitronix AFR Meter.
Don sold me the 10* bushing for my MSD distributor so I could get my initial timing up. I actually sent him an email last night with my specs and carb AFR#'s to get his opinion on if it may be a touch on the large side for my set-up. We'll see what he says?
'72 440 Cuda
11.673 @ 115.91 w/1.663 60'
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