Street / Strip Carter TQ jetting configurations....
#1891460
08/13/15 11:46 PM
08/13/15 11:46 PM
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Joined: Jan 2003
Posts: 1,763 Windsor, ON, Canada
Diplomat360
OP
top fuel
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OP
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Windsor, ON, Canada
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For those of you running the almighty Carter TQ (Thermoquad), street/strip configuration (so not a dedicated strip/bracket car - but I'd still love to hear about your setup), can you share what jet/rod/idle screw/air door settings you're running?
I have a 9800 electric choke carb here, also have the luxury of a wide assortment of jets and rods (prior kit searches and years of accumulating spare TQs for parts...LOL), however, try as I might I'm having a hard time getting to a suitable combination.
So in short, this is a small block (360 build), TQ on a Perfomer RPM intake with adapter plate, currently running the following setup:
RODS = 2005 IDLE MID WOT 0.065 0.055 0.040
PRIMARY JET = 100 SECONDARY JET = 143 METERING TREE = 1.5 turns from bottomed out IDLE MIX SCREWS = 4 turns out AIR DOOR TENSION = 2.5 turns from door just touching the airhorn AIR DOOR OPENING = .750" measured between dimple and back throttle bore
I have my Innovate LM1 wide-band O2 sensor to monitor the AFR. Street manners wise this combo seems great, idle @800RPM is about 14-14.4 AFR, seems sort of lean, but gives great throttle response, not loading up in gear and at idle. This combination pulls the highest vacum, adding more idle mix turns richens it up and vac drops and it loads up when left in gear for extended amount of time. About 13-13.3 during cruise, and about 12.5 in power step. However, as my secondaries kick-in the ratio will stabilize around high 12s, so 12.7-12.8, but consistently I see some crazy drops to as low as 10s...which implies incredibly rich!!!
Don't get me wrong, the car seems to love it...best throttle response and seems to make good power...but to what extent should I be worried about the rich/low AFR?
I've calibrated (and re-calibrated just to be sure) the O2 sensor, seems to check out fine.
So what are you guys out there running?
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Re: Street / Strip Carter TQ jetting configurations....
[Re: Diplomat360]
#1891481
08/14/15 12:15 AM
08/14/15 12:15 AM
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Joined: Sep 2010
Posts: 170 renton , washington
perfmachst
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renton , washington
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hi, I remove the spring from under cross bar. let metering rods ride with the throttle. they can jump up at low vac and cause rich condition also, I set the metering rod bar to make prim jetting. my combo is .095 /.098 pri, 154 sec, 2004 rods. .775 door opening. going down the track , mine shows 12.3 to 12.4 at wide open throttle. no spikes. this is on a 340 with stock intake these are from mopar race manual.
Last edited by perfmachst; 08/14/15 12:18 AM. Reason: add on
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Re: Street / Strip Carter TQ jetting configurations....
[Re: perfmachst]
#1892004
08/14/15 07:39 PM
08/14/15 07:39 PM
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Joined: Jan 2003
Posts: 1,763 Windsor, ON, Canada
Diplomat360
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hi, I remove the spring from under cross bar. let metering rods ride with the throttle. they can jump up at low vac and cause rich condition also... Hmm...good point...I'm going to try this approach. I have in the past tried different springs, eventually I found one that was weaker then stock. ..I set the metering rod bar to make prim jetting.... Yes, I understand that...but I'm looking for the actual settings that work for you. So, given all the literature I have, and the countless posts it looks like that "1-turn from bottomed out" setting is the factory starting point. I had mine set up to 1.5 turns, seemed to work OK. ...my combo is .095 /.098 pri, 154 sec, 2004 rods. .775 door opening. going down the track , mine shows 12.3 to 12.4 at wide open throttle. no spikes. this is on a 340 with stock intake these are from mopar race manual. Why are you running the different primary jet sizes? I have the MP books here as well, and noticed that, my guess was due to fuel distribution and runner design. Since I'm running Perfomer RPM intake I decided to just stick with matched sizes.
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Re: Street / Strip Carter TQ jetting configurations....
[Re: perfmachst]
#1892024
08/14/15 08:00 PM
08/14/15 08:00 PM
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Joined: Jan 2003
Posts: 6,840 The Swamp
Sixpak
master
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master
Joined: Jan 2003
Posts: 6,840
The Swamp
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hi, I remove the spring from under cross bar. let metering rods ride with the throttle. they can jump up at low vac and cause rich condition also, I set the metering rod bar to make prim jetting. my combo is .095 /.098 pri, 154 sec, 2004 rods. .775 door opening. going down the track , mine shows 12.3 to 12.4 at wide open throttle. no spikes. this is on a 340 with stock intake these are from mopar race manual. Back when I tried a TQ on my drag car I had jumping metering rods too. The trick was to find a spare set of springs and clip a coil off at a time til they no longer danced with the vacuum pulses.
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Re: Street / Strip Carter TQ jetting configurations....
[Re: Diplomat360]
#1892152
08/14/15 11:47 PM
08/14/15 11:47 PM
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Joined: Jul 2007
Posts: 863 Pinelands , NJ
joelson6
super stock
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super stock
Joined: Jul 2007
Posts: 863
Pinelands , NJ
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i used a TQ on my 440 setup in my stick Challenger. ran .104 pri, .147 sec. 1997 metering rod. use to run 12.0's with it. couple 11.9 runs at 116mph. i have a different setup now on the car. miss the old TQ. i always loved peoples reaction when i opened the hood.
***Edit***
oh forgot. i put 4 turns on the secondary door spring after it's level with the top. any less and it lived up to it moniker, thermobog.
Last edited by joelson6; 08/15/15 02:08 PM.
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Re: Street / Strip Carter TQ jetting configurations....
[Re: Diplomat360]
#1892170
08/15/15 12:14 AM
08/15/15 12:14 AM
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Joined: May 2009
Posts: 62 montreal, quebec,canada
7e5dartsport
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Joined: May 2009
Posts: 62
montreal, quebec,canada
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i used to run a tq on my former 340 in a dart hangten. ran 12.70s through the mufflers. i always ran it with stock jetting on the primaries and concentrated my efforts on the accelerator pump and secondary circuits. i used a shooter drilled to .028 in. and moved the acc. rod in the hole closest to the center of the carb on the lever for more pump shot. it allowed me to set the trap door tension to only 1 1/2 turns without bogging on the leave. i used .815 in. on the trap door opening with .156 secondary jets (drilled). i think yours is too rich at wide open throttle probably because your trap door is closed too much. something to try. by the way, mine was the small primary bore size ( 1 3/8) .
fully legal sounds the same as full illegal...
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Re: Street / Strip Carter TQ jetting configurations....
[Re: perfmachst]
#1892336
08/15/15 12:17 PM
08/15/15 12:17 PM
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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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hi, I remove the spring from under cross bar. let metering rods ride with the throttle. I have done the same. Can't comment on the secondary side jetting as I actually had to drill mine out to get the fuel mixture where I wanted it to be. After 25 years don't recall where its at. I did drill out the spray bars too on the secondary side and removed the "baffle" there after I had one fail and get ingested into the motor. Car ran faster than ever. I'd laugh as I removed parts of the carburetor the car would just keep going faster and faster..
"I think its got a hemi"
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Re: Street / Strip Carter TQ jetting configurations....
[Re: Diplomat360]
#1892445
08/15/15 03:33 PM
08/15/15 03:33 PM
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Joined: May 2009
Posts: 62 montreal, quebec,canada
7e5dartsport
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member
Joined: May 2009
Posts: 62
montreal, quebec,canada
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another thing that comes to mind when tuning tq`s. the carb must be vented anytime it is under full-throttle. if the vent is not operative on your carb, it will be impossible to tune. if so, remove the small rubber that closes the vent inside the carb. you would stay surprised the difference it makes. good luck.
fully legal sounds the same as full illegal...
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Re: Street / Strip Carter TQ jetting configurations....
[Re: 7e5dartsport]
#1892760
08/16/15 01:34 AM
08/16/15 01:34 AM
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Joined: Jul 2007
Posts: 863 Pinelands , NJ
joelson6
super stock
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super stock
Joined: Jul 2007
Posts: 863
Pinelands , NJ
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another thing that comes to mind when tuning tq`s. the carb must be vented anytime it is under full-throttle. if the vent is not operative on your carb, it will be impossible to tune. if so, remove the small rubber that closes the vent inside the carb. you would stay surprised the difference it makes. good luck. good to know, thanks!
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Re: Street / Strip Carter TQ jetting configurations....
[Re: Rob C]
#1892864
08/16/15 10:47 AM
08/16/15 10:47 AM
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Joined: Jan 2003
Posts: 1,763 Windsor, ON, Canada
Diplomat360
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"Idle mixture screws 4 turns out." Wow! So you have larger primary jets?... I'm running a .100 primary jet right now, and by 4 turns I mean full turns off of the screws just being seated. Normally with all my other combinations I have to run at least 6 turns to get any sort of decent/stable idle. The ideal meetering rod @ idle turned out to be the 2005 (75-2005 - 0.065,0.055,0.040), but past idle it was just too darn rich at cruise. So I moved to 2144 now (75-2144 - 0.069,0.061,0.050) which with the same primary jetting gave me a pretty decent all around performance and my AFR is around the 14.1 @ idle, 13.5 @ cruise and about 13.3 @ WOT. So I want the idle/off-idle performance of the 2005 rod but primary main and high-speed performance of 2144 rod. Ideally I'd like to run the 2005 rod for the primary side (pulling 8-9" of vac @ 800RPM is great with my cam) but need to go a bit leaner on the jets, so I will try a move to 0.095 jet, while on the secondary I'll go up to 0.149, measure it and maybe drill a set out to 0.154, or more, given that my air-door openning distance right now is on the smaller side.
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Re: Street / Strip Carter TQ jetting configurations....
[Re: 7e5dartsport]
#1892868
08/16/15 10:51 AM
08/16/15 10:51 AM
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Joined: Jan 2003
Posts: 1,763 Windsor, ON, Canada
Diplomat360
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OP
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Joined: Jan 2003
Posts: 1,763
Windsor, ON, Canada
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another thing that comes to mind when tuning tq`s. the carb must be vented anytime it is under full-throttle. if the vent is not operative on your carb, it will be impossible to tune... Hmm...OK, worth a try, I have the vent currently plugged with a cap on the vent tube only because I didn't feel like running a vent line to the purge carnister (one less vac line in the engine bay, kept it cleaner), but I had never realized this might be the implication. Good call!!!
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Re: Street / Strip Carter TQ jetting configurations....
[Re: Rob C]
#1904586
09/01/15 11:57 PM
09/01/15 11:57 PM
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Joined: Jan 2003
Posts: 1,763 Windsor, ON, Canada
Diplomat360
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OP
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Oh thanks! The Tq is one of my favorites to mess with but I have not gotten paste the 12's with it. So hence, no real mods needed.
Any updates Diplomat360? Nah, nothing yet, last week was our family vacation time, spent on the WestCoast (ahh, those guys have it made there, sun all year long...LOL), but I'm hoping to try out the larger secondary jets later on in the week, probably going to drill up to .156" as the biggest one I have is 0.149". I will play around with the bigger secondary jet first, try to make that work with my current primary jet and the rods...my goal is to go for more air-flow (biggest secondary air-door openning) while staying in the high 12s AFR. Hopefully I can report back before the weekend...stay tuned!
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Re: Street / Strip Carter TQ jetting configurations....
[Re: Rob C]
#1906973
09/05/15 05:00 PM
09/05/15 05:00 PM
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Joined: Jan 2003
Posts: 1,763 Windsor, ON, Canada
Diplomat360
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...Any updates Diplomat360? Alright...small update to report. Couple of things actaully, I moved to a much richer primary jet, from 100 to 104, my thinking being this should feed the idle circuit a little extra fuel, while allowing me to retain the 2144 rods which so far have been a pretty good combination. I also moved to a 156 secondary jet. Well...I'm thinking you can guess the result...the overall primary cruise/power is far too rich now...LOL...we are talking 12.2-12.5, and I've seen it actually dip into the 11s regularly as I near the 2ndaries openning. The off-idle shows that the engine is loading up with fuel. So this is far too much fuel...although strangely, once moving along (city cruise, so about 2K RPM) the motor sounds "better"??? I mean it is smoother, not sure how else to describe it... The WOT on the other hand is pretty decent around 12.6, but I did open up the air-valve to the max .900". So in summary, comparing this to my previous primary jet = 100, secondary jet = 143, rod=2144 I am looking at the following changes (the below numbers are just math jet/rod/area calculations, a direct comparison of +/- change): IDLE % = 15.6 CRUISE % = 13.0 POWER % = 10.9 SEC POWER% = 19.0 TOTAL POWER% = 16.8 My next run will be to go back to primary jet = 100 and just look at the difference the bigger 156 secondary jet has.
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