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Re: Street / Strip Carter TQ jetting configurations.... [Re: Diplomat360] #1908327
09/07/15 10:31 PM
09/07/15 10:31 PM
Joined: Sep 2015
Posts: 8
Michigan
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chargerjoert Offline
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chargerjoert  Offline
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Michigan
440 with XE268 cam, Holley SD single plane intk, 727 with 3.23... Running an early Tq 6518S with normal idle screws (orig had holes in them) and with orig 2124 top. IFR drilled to 0.038" and then a 0.010" wire in the IFR. Idle mixture screws 2 turns out. Initial 22 degs with 11 degrees in distributor all in by 3,100 rpm. 18 degree vacuum advance can about 3 turns out.
0.098" primaries with 2024 rods about 3 turns from bottom. 0.143" secondaries. Oh, using inlet needles that will pass a 7/64" drill bit. Air door about 0.7", 1.5 turns. 0.028" pump shot on the slowest setting. Getting about 14 mpg on Shell V-pwr.

Re: Street / Strip Carter TQ jetting configurations.... [Re: Diplomat360] #1910384
09/11/15 03:19 AM
09/11/15 03:19 AM
Joined: Mar 2005
Posts: 792
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Rob C Offline
super stock
Rob C  Offline
super stock
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Joined: Mar 2005
Posts: 792
Earth
Sorry chargerjoert but what is IFR?

Re: Street / Strip Carter TQ jetting configurations.... [Re: Diplomat360] #1910410
09/11/15 09:07 AM
09/11/15 09:07 AM
Joined: Apr 2014
Posts: 129
SE Indiana
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kowalski440 Offline
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kowalski440  Offline
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Posts: 129
SE Indiana
Idle Feed Restrictors

Re: Street / Strip Carter TQ jetting configurations.... [Re: kowalski440] #1913275
09/15/15 09:44 PM
09/15/15 09:44 PM
Joined: Jan 2003
Posts: 1,753
Windsor, ON, Canada
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Diplomat360 Offline OP
top fuel
Diplomat360  Offline OP
top fuel
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Joined: Jan 2003
Posts: 1,753
Windsor, ON, Canada
OK, many terms out there, please point out the passage you are talking about in the below circuit diagram:



Is it the:

1) RESTRICTOR
2) IDLE WELL TUBE
3) IDLE AIR BLEED
4) IDLE RESTRICTOR

LOL...yeah, many different points to adjust...which is what I feel makes it such a remarkable carburetor.

The IDLE WELL TUBE is 0.039" in my 9810S carb.

I have modified the IDLE AIR BLEED to accept brass plugs so that I can control the amount of air bleed, that was done mostly due to the lower idle vac signal, however playing with the settings ultimately led me back to the stock size.

I also removed the plug that leads to the RESTRICTOR, but I did not actually adjust the size of that passage.

Re: Street / Strip Carter TQ jetting configurations.... [Re: Diplomat360] #1913419
09/16/15 12:27 AM
09/16/15 12:27 AM
Joined: Sep 2015
Posts: 8
Michigan
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chargerjoert Offline
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chargerjoert  Offline
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Joined: Sep 2015
Posts: 8
Michigan
yes, what I called the IFR for Idle Freed Restriction is the opening to the Idle Well Tube. Which you have reported is at 0.039".

Most, if not all TQ's I have, seem to have a 0.034" IFR stock. At 0.039" I'm guessing your's has been opened up. I'm surprised that with 0.039" opening the idle mixture screws are 4 turns out. However, your IAB changes will effect this. I have never messed with the IAB's. I open the IFR to get the mixture screws 2 turns out. If I over shoot it, then I add a wire.

Cruising is mostly on the IFR, so this circuit is all about the fuel economy. In your case, you may want to try reducing IAB size and see if that results in the idle mixture screws being 2 turns out. Spark plugs should be white if just light throttle cruising, but don't be so lean that coolant temp goes up.

Since my last post, I have had to limit vacuum advance to 16 degrees. And switched to 1950 rods.

Re: Street / Strip Carter TQ jetting configurations.... [Re: Diplomat360] #1913592
09/16/15 12:05 PM
09/16/15 12:05 PM
Joined: Mar 2005
Posts: 792
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Rob C Offline
super stock
Rob C  Offline
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Posts: 792
Earth
Love the tech, thanks so much for this tutorial. This is huge for me. Thanks!

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