Distributor curve

[CamaroAdam73]

Not really IMO. I've seen Qjets run incredible on engines much wilder than yours. It just boils down to tuning and that's where a Holley shines. They're easier to tune and you can buy them already setup for 'racier' engines. With the Qjet, the starting point is usually much further away from where you want to be.

Just curious but have you tried the tip in preceedure with the APT as shown in Cliff's book?

Glad to hear, i'm not giving up on this Qjet, i know the potential it has. No i haven't messed with the APT at all, the ONLY adjustments I've made to the carb thus far are simply idle mixture. I can't find my book on Qjets from cliff, can you run through the procedure for me?

On idle mixture, if i hit the point where the mixture becomes too rich the vacuum/RPMs should drop right? i make adjustments in 1/4 turn at a time observing both gauges.
Beyond that i think i'm going to need different jets. I'm still really in the dark with tuning Qjets so i appreciate the help guys.

Before i make any more adjustments i'm going to swap the donor carb on and see how it acts, hopefully the donor carbs not too small and runs lean too , that would be my luck lol.

 

[olds307 and 403]

It looks like he has done a few Qjets to good reviews. Does it have the thread out plug for the APT? If so, I would try that first. It may need to be sent back and he should be able to address any issues. I also like the Qjet, very nice driving carb when matched to the motor it is used on.

 

[CamaroAdam73]

It looks like he has done a few Qjets to good reviews. Does it have the thread out plug for the APT? If so, I would try that first. It may need to be sent back and he should be able to address any issues. I also like the Qjet, very nice driving carb when matched to the motor it is used on.

There's some good testimonial on ken's website, i'm not making any major adjustments till i get on the phone with him Monday. I'll check tomorrow and see if the plug is threaded/ pressed in for the APT.

 

[DoubleV]

[Glad to hear, i'm not giving up on this Qjet, i know the potential it has. No i haven't messed with the APT at all, the ONLY adjustments I've made to the carb thus far are simply idle mixture. I can't find my book on Qjets from cliff, can you run through the procedure for me?

From memory, you get the car up to operating temp, turn idle up to about 2000-2200 rpm via fast idle screw, and close choke flap just enough to richen mixture without choking the motor out. If the RPM's rise a little ( like 50-100 RPM's ), then everythings good. If it does not behave this way, then use the APT to adjust the primary rods so so it does.

On idle mixture, if i hit the point where the mixture becomes too rich the vacuum/RPMs should drop right?

Yes, but both too rich or too lean can cause a drop in vacuum/RPM's.

 

[CamaroAdam73]

The APT cap is pressed in.

I noticed two weird things, one I've known about and forgot to mention.

1st, I noticed a strange sound coming from the carb with the car off, i haven't run it at all today. It's coming from the fuel bowl up through the vents. Its making a sound like..image if you put your ear up to a seashell, like air escaping but it's constant and doesn't go away. I didn't start the engine today.

2nd, The fuel drains out of the carb overnight, i don't know if its going into the intake or back into the fuel system. Is this supposed to happen?
My fuel system is tight,, and i know it's not the car because this carb did the same thing when i had it on another car for a BRIEF period of time. I know the bowl is empty because if i blip the throttle it just shoots air/bubbles into the barrels.

I had the carb bolted up to a SBC 327 in a 67 impala for a day just to move it from one parking spot too another. I left the carb on overnight and had to move the car again the next day, that's when i first took notice.

 

[CamaroAdam73]

Alright made progress today. I adjusted the APT and that helped ALLOT. The engines no longer running rich and has plenty of power. set initial timing to 20 so that should bring me up to 36. i was able to get the vacuum signal up to 15" by richining the idle mixture alittle more.

The only problem that remains is the engine drops to 600/700 RPM from 1100 RPM when i put it in gear, if it would just hold 700 i'd be happy.

 

[Fox80]

I think some of the problem you have is the motor combo, its not really geared for idle power, or idle quality. Things you need to keep in mind it takes ALOT of power for a motor to idle against the convertor, some 850hp motors only make 75hp at idle, and really struggle to idle in gear. What I would try is the idle mixture screws to richen or maybe even lean the idle, or even use the ported source to pull the vacuum advance out of the equation at idle (tho I've never seen that help) or you may just have to turn the idle up a bit and kind of split the difference

 

[pontiacgp]

time to drop in a manual transmission...

 

[CamaroAdam73]

time to drop in a manual transmission...

Best answer haha, i wish i could.

Fox80, would having a Torque converter with below the cams recommended stall hurt idle quality?

 

[Fox80]

I would think it probably does help, a high stall converter does still pull the motor down when you put it in gear but not to the extent that a stock one does. I'm no converter expert but I think the biggest reason to use them is on motors that don't make good bottom end power it allows the motor to rev more before it lets the car move normally so I would think it would also lessen the load on a motor at idle, but it won't be like a manual car with the clutch pushed in but it will most likely help your situation