reconsidering using a quadrajet :/
#1
Senior Member
Thread Starter
iTrader: (4)
Join Date: Jun 2010
Location: Martinsburg,WV
Posts: 554
Likes: 0
Received 6 Likes
on
6 Posts
Car: '02 T/A
Engine: LS1
Transmission: 4l60e
Axle/Gears: 3.23
reconsidering using a quadrajet :/
I just picked up my vortec heads from the machine shop and the engine builder I talked to said I could make about 40 hp more with a quick fuel carb than the quadrajet. He also said the quickfuel 650 would be about $350 new where as the rebuilt quad would be $220. He's reputable in the area so I trust his experience. I already have a performer Intake for the spreadbore though I could return it and get an rpm performer for a squarebore. I've got no experience with carbs fwiw. Would the hp difference be that significant? Any input would be greatly appreciated.
#2
Supreme Member
iTrader: (2)
Join Date: Aug 2002
Location: Western NY State
Posts: 1,018
Likes: 0
Received 1 Like
on
1 Post
Car: 87 bird
Engine: enough to break stuff
Transmission: manual th400
Axle/Gears: 4.10
Re: reconsidering using a quadrajet :/
to me the easiest one to learn and tune is the holley type, there are tons of books, and info online etc. lets put it this way i have a quad sitting on the shelf and 750 holley dp on my car. and i could have someone who used to work at rochester help me tune it.
#3
Supreme Member
iTrader: (2)
Join Date: Aug 2002
Location: Western NY State
Posts: 1,018
Likes: 0
Received 1 Like
on
1 Post
Car: 87 bird
Engine: enough to break stuff
Transmission: manual th400
Axle/Gears: 4.10
Re: reconsidering using a quadrajet :/
i like mechanical secondary, mechanical choke because its easy to figure out in the pit if its working. if you are going to be making 350-400hp i would recommend a 750.
http://www.summitracing.com/parts/hly-0-4779c/overview/
http://www.summitracing.com/parts/hly-0-4779c/overview/
#4
Senior Member
iTrader: (7)
Join Date: Jan 2012
Location: On TGO
Posts: 531
Likes: 0
Received 2 Likes
on
2 Posts
Car: 88 GTA
Engine: Built 355 to install
Transmission: Built turbo 350
Re: reconsidering using a quadrajet :/
I haven't a clue why people think the Q-jet is so hard to work on or tune, there's many books and how-to's out there, all one has to do is read and learn.
I've been tuning/run'n Q-jets for over 30 years and IMO their the best bang for the buck......
#5
Supreme Member
iTrader: (7)
Join Date: May 2004
Location: Lexington, SC
Posts: 5,291
Likes: 0
Received 58 Likes
on
52 Posts
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Re: reconsidering using a quadrajet :/
were this a swap from the non-vortec perfromer to the non-vortec rpm along with the carb swap, I could see some noticeable gains. i suspect the difference between the vortec performer and rpm is not quite as great though, based on the taller intake runner for the vortecs. i hope to one day see some actual comparison numbers, but oh well.
if you do go mech carb bear in mind that you will also need to replace your disturber for a mech/vac advance one. converter lockup will also need to be accommodated some other way. the ecm and all of its associated wiring can then be removed. something of a crossroads here with the intake choice.
if you do go mech carb bear in mind that you will also need to replace your disturber for a mech/vac advance one. converter lockup will also need to be accommodated some other way. the ecm and all of its associated wiring can then be removed. something of a crossroads here with the intake choice.
#6
Supreme Member
Re: reconsidering using a quadrajet :/
The only way to know this is tune each carb to the engine then test on a dyno, 40 more hp from just a carb swap IF the Q-jet is tuned correctly is hard to swallow.
I haven't a clue why people think the Q-jet is so hard to work on or tune, there's many books and how-to's out there, all one has to do is read and learn.
I've been tuning/run'n Q-jets for over 30 years and IMO their the best bang for the buck......
I haven't a clue why people think the Q-jet is so hard to work on or tune, there's many books and how-to's out there, all one has to do is read and learn.
I've been tuning/run'n Q-jets for over 30 years and IMO their the best bang for the buck......
also, they do make carb adapters if needed.
http://www.summitracing.com/parts/edl-2696/overview/
#7
Senior Member
Thread Starter
iTrader: (4)
Join Date: Jun 2010
Location: Martinsburg,WV
Posts: 554
Likes: 0
Received 6 Likes
on
6 Posts
Car: '02 T/A
Engine: LS1
Transmission: 4l60e
Axle/Gears: 3.23
Re: reconsidering using a quadrajet :/
were this a swap from the non-vortec perfromer to the non-vortec rpm along with the carb swap, I could see some noticeable gains. i suspect the difference between the vortec performer and rpm is not quite as great though, based on the taller intake runner for the vortecs. i hope to one day see some actual comparison numbers, but oh well.
if you do go mech carb bear in mind that you will also need to replace your disturber for a mech/vac advance one. converter lockup will also need to be accommodated some other way. the ecm and all of its associated wiring can then be removed. something of a crossroads here with the intake choice.
if you do go mech carb bear in mind that you will also need to replace your disturber for a mech/vac advance one. converter lockup will also need to be accommodated some other way. the ecm and all of its associated wiring can then be removed. something of a crossroads here with the intake choice.
I am going mechanical and already have the non ccc dizzy. And I've heard nothing bad bad about the adapters.
Last edited by armybyrd; 11-27-2014 at 09:12 AM.
Trending Topics
#8
Supreme Member
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,041
Received 395 Likes
on
337 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: reconsidering using a quadrajet :/
The only way to know this is tune each carb to the engine then test on a dyno, 40 more hp from just a carb swap IF the Q-jet is tuned correctly is hard to swallow.
I haven't a clue why people think the Q-jet is so hard to work on or tune, there's many books and how-to's out there, all one has to do is read and learn.
I've been tuning/run'n Q-jets for over 30 years and IMO their the best bang for the buck......
I haven't a clue why people think the Q-jet is so hard to work on or tune, there's many books and how-to's out there, all one has to do is read and learn.
I've been tuning/run'n Q-jets for over 30 years and IMO their the best bang for the buck......
I find the Q-Jet easier to work on than the Holley.
#9
Senior Member
Thread Starter
iTrader: (4)
Join Date: Jun 2010
Location: Martinsburg,WV
Posts: 554
Likes: 0
Received 6 Likes
on
6 Posts
Car: '02 T/A
Engine: LS1
Transmission: 4l60e
Axle/Gears: 3.23
Re: reconsidering using a quadrajet :/
Thanks for all the input. I'm just gonna keep my manifold and get the rebuilt quad as planned.
#10
Member
Join Date: May 2014
Location: Seattle, WA
Posts: 184
Likes: 0
Received 0 Likes
on
0 Posts
Car: '84 Camaro Z28
Engine: 305 HO
#11
Junior Member
Join Date: Mar 2009
Location: sioux lookout ON. Canada
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
Car: 83 firebird
Engine: 350
Transmission: 700
Axle/Gears: 3.23
Re: reconsidering using a quadrajet :/
Thread
Thread Starter
Forum
Replies
Last Post