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Quadrajet tuning advice.
Posted: Tue Nov 15, 2011 1:59 pm
by Cris
Howdy, I have one of these on my 360 W200. Sits on an Edelbrock manifold.
How do I adjust air/fuel on this. Is it the two screws equadistant apart on the front of the carb.?
Truck came from the Oregon coast and now lives @ 6K feet. Pretty much runs like crap, sputters
spits etc. Truck has the perlux ignitor and matching coil, how do I get this carb back to 'zero'
and adjust out from there. Screw the front two screws all the way in, and then how many flats (or turns)
out for a baseline.?
It seems pretty grungy on the inside, certainly not 'new', might end up putting a kit into it if all else fails.
Thanks,
Cris
Re: Quadrajet tuning advice.
Posted: Tue Nov 15, 2011 4:17 pm
by gyman98
The two screws on the front are your idle mixture screws and won't help with anything beside idle characteristics. Since a Quadrajet is a GM carb, you might have better luck searching on Chevy sites or post up more of the problems you are having and we'll try and help
Re: Quadrajet tuning advice.
Posted: Tue Nov 15, 2011 6:12 pm
by surfnuke9
Book by a Pontiac Guy I know named Cliff Ruggles.....
He forgot more about Q-Jets in the last 5 minutes than I will ever hope to know.
The book is GREAT by the way.
http://www.google.com/products/catalog? ... CDgQ8wIwBA#
Re: Quadrajet tuning advice.
Posted: Wed Nov 16, 2011 10:31 am
by Cris
Awesome.! Looks like Christmas is coming early. Thanks.
Re: Quadrajet tuning advice.
Posted: Wed Nov 16, 2011 5:51 pm
by 712edf
360 equipt trucks came from the factory with Q-jet carbs in the mid 80's.
Bucky
Re: Quadrajet tuning advice.
Posted: Thu Nov 17, 2011 6:49 am
by daytb
usuly all the way in and out 1 1/2 to 2 turns might be acl pump timing too or stuck power plunger with the metering rods
Re: Quadrajet tuning advice.
Posted: Fri Nov 18, 2011 10:43 pm
by sweatybetty
they are nicknamed "quadrajunk" for a reason.
Re: Quadrajet tuning advice.
Posted: Sat Nov 19, 2011 4:42 pm
by surfnuke9
yeah, that nickname and thermo-bog are names made up by those who dont/wont take the time to understand the carb well enough to tune one.
Re: Quadrajet tuning advice.
Posted: Sun Nov 20, 2011 12:43 am
by tinbasher
you can get a range of accelerator pump cams for those as well.
Re: Quadrajet tuning advice.
Posted: Sun Nov 20, 2011 10:59 pm
by RussRoth
sweatybetty wrote:they are nicknamed "quadrajunk" for a reason.
surfnuke9 wrote:yeah, that nickname and thermo-bog are names made up by those who dont/wont take the time to understand the carb well enough to tune one.
Actually both of those carbs are very good IF you set them up properly. I have had both run very well and it comes down to understanding how they work and then set them up step by step according to the book before you even think of modifying them. Unless you really know what you are doing. JMHO and experience.
Re: Quadrajet tuning advice.
Posted: Sun Nov 20, 2011 11:19 pm
by sweatybetty
surfnuke9 wrote:yeah, that nickname and thermo-bog are names made up by those who dont/wont take the time to understand the carb well enough to tune one.
that may be true, but a holley is so much simpler and easier to tune. my
