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Q-jet vs. avenger

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uberbeans

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What is the general consensus on which carb is better for off-road, A new Q-jet 780 or an Avenger. I already have the q-jet and like it. I bought it because the magazines all said that it was the best off-road carb. I read an article that said you can have a 30 degree bank with the Avenger, and wondered what you guys think a Q-jet could do. Yes, I WOULD like a TBI but the cost is daunting.
 
I am a big Q-jet fan and think they are great off-road carbs ( assuming F.I. is not an option ).
I have no experience with the Avanger so I can not give input on it - sorry.

The low speed throottle response from the primary's make the Q-jet a great low speed/light throttle carb.

Tom
 
well lets see....
I have always used q-jets.. set it and forget it... even unadjusted they ran fine....


so when I near finished my truck I needed to rebuild my carb.. picked up a fourwheeler magazine and there was an article on the truck avenger...

so I bought the mag and read the article... it said the proclaimed 30 degree angles.. so they threw one on a jeep....
they tested the throttle response and all and liked it.... then they tested the 30 degree angle and found it to not be true.. it worked even better than at 30 degrees.. they laid the jeep on its side (not on purpose) and it was still running for a bit... then they went up a large rock and the jeep shot the nose up in the air... and rested back on the spare tire mounted on the rear and it sat there running... they were amazed and said.... If fuel injection is not on the possibility list the Highly recommended the truck avenger...

so I was sold.. bought me a truck avenger 670 and love it.. now I do mainly mud and trails.. so havent found any real steep angles to try yet....

I say go for it.. I paid $400 for mine from pepboys 1.5 years ago.. cant find my receipt as i have the 90670-1 has problems but holley will take it back for free (I have to pay shipping to them) and they will give me a 90670-2... so it is in the camaro right now all boxed up and ready to ship out today.....


you can now get them for cheap on ebay and around (less than $400) so id say buy a new one from the cheapest place.. then if you get the 90670-1 just call them and tell them you bought a new one and you want to exchange it for the -2 and they will


holley :bow:
never thought i would like holleys...


now my -1 was a pita with the choke and adjustments... but hoping all those problems were due to the -1 :wink1:
 
I wonder if the q-jet is comparable, though when taking angles into consideration. I know that their crawling/part throttle is great. Do you have to constantly adjust the avenger like alot of other Holleys. I'm not against Holleys, they are the most tuneable out there, problem is you have to tune them more often. Do you tune yours alot? I had a 750 in a 69 Camaro that I was always messing with.
 
uberbeans said:
Anyone with someinfo on Q-jet offroad capability and some stories?
Click to expand...



I had one on a Toyota Land Cruiser FJ-40 with a Q-jet'd SBC years ago and loved it. I could ride ruts and damn near put it on its side with no carb issues and it could take a grade of monsterous levels with out a whimper ( there are no mountains around here but as a young idiot I would drive up the side embankment of a very tall bridge for thrills and because my other buddies could not do it with thier carb'd ( non Q-jets ) motors . Everytime I drive to Perdido Key and go over that bridge now I think of how stupid we were and how lucky we all are to have not killed ourselves in the process.

I kept that same Q-jet on four different motors in that FJ-40 and it always ran great. Even high speed whoop-D-doo's ( small dunes that we use to jump at great speed ) would not cause problems with the carb.

The Q-jet I used was off of a 1974 K-20 that I got out of a junk yard and rebuilt it - so it was nothing special and new. I epoxied the plug on the bottom that are prone to leaking and it ran for years without a whimper.

Great experience with it and I would not hesitate to do it again as a carb option.

Tom
 
I think a q jet would work just as good as a truck avenger carb both seem to be excellent. If you can find a local q-jet specialist they can rebuild and mod to exacting specs. Then you will hardly know you don't have FI. I havent had a avenger but lots of freinds do they love them after the intial tuning is done, a guy a know rejets almost every time he goes somewhere with a major elevation change because it is so easy. One thing that may be important a couple of freinds have switched to avengers from qjets and got way less gas milage with 2mpg less seeming to be commen.
 
blazinzuk said:
One thing that may be important a couple of freinds have switched to avengers from qjets and got way less gas milage with 2mpg less seeming to be commen.
Click to expand...

im pulling 11mpg with mine... and this is the bad avenger.... it is not a spreadbore so wonder if that is partially why......

I like mine ...... :wink1:
 
All I can say is. Q-jets are THE benchmark all other offroad carbs are judged against. Might as well have the best. Set them and forget them. They dont call Q-Jets "Hillbilly Injection" for no reason.
 
The way I see it is that the Q-jet is set up better by design for offroading (better placement of the floats) and the Holley is not. The Truck Advenger version is just trying to make up for the Holleys natural faults and does a ok job. The Demon Trucker is just a nicer version of the Holley. I think that all of the carbs will do a good job offroad but I do agree that the Qjet needs less tuning. If it was me, I would just get the one at the best deal unless they all cost close to the same, then I would go with the Qjet.
 
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