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02-05-2024, 02:10 PM | #11 |
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Re: Too Slow/Q-Jet question
Q-jets aren't really "cut and dry" across the board. Some carbs are good with a little work, and others are slow no matter how much effort is thrown at them. If the money isn't there to send a carb out to be built by one of the "gurus," then I would suggest buying the Quadrajet book by Cliff Ruggles. I surprised myself with how much I was able to accomplish with some basic mods to a bone stock Q-Jet. I believe what was meant by a "fast throttle plate" means the linkage was made to open the primaries and secondaries at the same time, unlike the stock progressive linkage that opens the primaries a decent amount first before opening the secondaries. The 1-1 linkage carbs tend to not drive around as well, but some swear by them being faster. As far as tuning goes, the car will tell you what it likes and doesn't like. MSDs can cause plugs to look good even when things aren't so good. I would suggest taking some "swings" at jetting, rods, and trying a few different hangers if you have some. Even if what you already have ends up being the best, at least you'll learn something.
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1189 F/SA Defunzalo Racing Enterprises |
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02-05-2024, 03:42 PM | #12 | |
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Re: Too Slow/Q-Jet question
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02-05-2024, 03:53 PM | #13 | |
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Re: Too Slow/Q-Jet question
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Dawson Pauley #2827 N/SA 1980 Malibu SW 2S 305/180 #2827 S/ST 1978 Mazda RX7 w/ 383 sbc/glide |
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02-05-2024, 03:54 PM | #14 |
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Re: Too Slow/Q-Jet question
Don't really need to speed up secondary opening if you are two stepping it off the line.
I don't think we know that yet, either.
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02-05-2024, 04:02 PM | #15 | |
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Re: Too Slow/Q-Jet question
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The car has changed hands multiple times since it last ran, best I can tell it last went down the drag strip in 2015 or so. I do not know who last ran it. No idea on TH350 builder or first gear, but I know it and the converter came out from behind another 305 of similar combo so I'm 90% sure its 2.74 first gear. 5.38 rear gear on a Hoosier 30x9 C06 radial. If you need any more info please send me a PM, I don't want to hash every minute detail of the car out and make the entire forum listen, but I do genuinely appreciate all the people who have reached out or chimed in!
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Dawson Pauley #2827 N/SA 1980 Malibu SW 2S 305/180 #2827 S/ST 1978 Mazda RX7 w/ 383 sbc/glide |
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02-05-2024, 04:04 PM | #16 |
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Re: Too Slow/Q-Jet question
Just gonna give it to you straight …. Just because your car runs close to the 1/8 mile index DOES not mean it will run close to the 1/4 mile index AND have you weighed the car yet ??? Number two ..:: stockers are all about RING SEAL .. just remember that. … Cheers…..
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02-05-2024, 04:08 PM | #17 |
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Re: Too Slow/Q-Jet question
Oh yeah, sorry. I am not using a 2-step at this time. I could switch to one if you thought that might help, but I've heard it's slower to use one.
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Dawson Pauley #2827 N/SA 1980 Malibu SW 2S 305/180 #2827 S/ST 1978 Mazda RX7 w/ 383 sbc/glide |
02-05-2024, 04:12 PM | #18 | |
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Re: Too Slow/Q-Jet question
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Mark Lewis put the engine together for me, I think he did a great job with what he had and I trust the rings are sealing properly. I haven't noticed any extra blow-by, the valve cover breather has 0 signs of oil comin out of it after 4 1/8 mile passes. Also, I understand that this car will not backhalf and pick up time in the 1/4. I figured I'd have to go at least .10 to .15 under the 1/8 mile index to get under the 1/4 mile 13.00 index for N/SA
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Dawson Pauley #2827 N/SA 1980 Malibu SW 2S 305/180 #2827 S/ST 1978 Mazda RX7 w/ 383 sbc/glide |
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02-05-2024, 04:14 PM | #19 | |
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Re: Too Slow/Q-Jet question
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Dawson Pauley #2827 N/SA 1980 Malibu SW 2S 305/180 #2827 S/ST 1978 Mazda RX7 w/ 383 sbc/glide |
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02-05-2024, 04:41 PM | #20 |
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Re: Too Slow/Q-Jet question
Apart from asking around the racing community, there are a few places to buy qjet parts. I bought primary jets, secondary rods, and needle and seats through jegs, with the brand being "JET Performance." Ebay is also a good resource for hangers, jets, and rods. Something I've seen done is if you don't use primary rods, you can screw in Holley jets in place of the rochester jets. The threads are very close, but not identical. This is not advised if you ever want to try rochester jets and primary rods ever again. So far I've only ever 2 stepped with a qjet. If you ever decide to "chill down" your engine, make sure to try it first when it isn't important. Especially footbraking, qjets sometimes need a little different tuneup when trying to leave the line at very cold engine temps.
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