Q-Jet tuning question
Thread Starter
Safety Car
Joined: Nov 2006
Posts: 4,449
Likes: 0
Q-Jet tuning question
I had a question or 2 to ask before my dad and I dive into my carb, its either running lean or rich, Ive got quite the hesitation on acceleration, and I hav a feeling that it hasent been touched in a FEW years
what will I defantly need to replace, I know the carb gasket, and I was thinking of going up a jet size, due to the headers a free flowing exaust, but is there anything else?
what are some other tips?
Im waiting on my "how to rebuild and modify your Rochester Quadrejet" by cliff ruggles
Im sure Ill think of more
Miles
what will I defantly need to replace, I know the carb gasket, and I was thinking of going up a jet size, due to the headers a free flowing exaust, but is there anything else?
what are some other tips?
Im waiting on my "how to rebuild and modify your Rochester Quadrejet" by cliff ruggles
Im sure Ill think of more
Miles
Racer
Joined: Aug 2005
Posts: 340
Likes: 0
From: Rural Crete Nebraska
You'll definitely want to replace the accelerator pump if you're getting a hesitation. You might as well just go to Napa and order the echelin rebuild kit specifically for your q-jet. I did mine last year and was pleased.
Pro
Joined: Oct 2007
Posts: 587
Likes: 0
From: Overland Park Kansas
Is that just for rebuilds or does it include tuning parts too?
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
I had a question or 2 to ask before my dad and I dive into my carb, its either running lean or rich, Ive got quite the hesitation on acceleration, and I hav a feeling that it hasent been touched in a FEW years
what will I defantly need to replace, I know the carb gasket, and I was thinking of going up a jet size, due to the headers a free flowing exaust, but is there anything else?
what are some other tips?
Im waiting on my "how to rebuild and modify your Rochester Quadrejet" by cliff ruggles
Im sure Ill think of more
Miles
what will I defantly need to replace, I know the carb gasket, and I was thinking of going up a jet size, due to the headers a free flowing exaust, but is there anything else?
what are some other tips?
Im waiting on my "how to rebuild and modify your Rochester Quadrejet" by cliff ruggles
Im sure Ill think of more
Miles
BigBlockk
Later.....
Le Mans Master
Joined: Aug 2006
Posts: 7,427
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From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
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Racer
Joined: Feb 2007
Posts: 271
Likes: 25
From: Buena Vista Colorado
Quadrajet Info
Lars Grimsrud IS the Quadrajet expert. Most on this forum will tell you to not touch your Quadrajet until you've read up on all he has to say.
Here's a link to most - maybe all - of his papers:
http://wiki.corvettefaq.com/index.php?title=Intake
Good Luck!
Jerry
Here's a link to most - maybe all - of his papers:
http://wiki.corvettefaq.com/index.php?title=Intake
Good Luck!
Jerry
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Thread Starter
Safety Car
Joined: Nov 2006
Posts: 4,449
Likes: 0
Lars Grimsrud IS the Quadrajet expert. Most on this forum will tell you to not touch your Quadrajet until you've read up on all he has to say.
Here's a link to most - maybe all - of his papers:
http://wiki.corvettefaq.com/index.php?title=Intake
Good Luck!
Jerry
Here's a link to most - maybe all - of his papers:
http://wiki.corvettefaq.com/index.php?title=Intake
Good Luck!
Jerry
Miles
Thread Starter
Safety Car
Joined: Nov 2006
Posts: 4,449
Likes: 0
will these kits come with everyting that will need to be replaced on an average tune up?
dad is getting wanting to do it soon, hes getting excited, all Im waiting on is for me to finnish reading the book I bought on them
Also, What would be the correct Jet size I need if I want to go up one size. I read the paper Lars wrote and It said with free flowing exause and headers I should go up one size, what would that side be?
Miles
Last edited by randommj; Jun 20, 2008 at 12:32 PM.
Race Director
Joined: Apr 2003
Posts: 19,352
Likes: 654
From: Tampa, Florida
Performance parts DO NOT come in the kits. Rods and jets can be found online but the selection is very thin. I bought a few 'swap meet' carbs for spare parts.
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
would O rileys have this, we dont have a NAPA, and would I be able to get bigger jets with this kit?
will these kits come with everyting that will need to be replaced on an average tune up?
dad is getting wanting to do it soon, hes getting excited, all Im waiting on is for me to finnish reading the book I bought on them
Also, What would be the correct Jet size I need if I want to go up one size. I read the paper Lars wrote and It said with free flowing exause and headers I should go up one size, what would that side be?
Miles
will these kits come with everyting that will need to be replaced on an average tune up?
dad is getting wanting to do it soon, hes getting excited, all Im waiting on is for me to finnish reading the book I bought on them
Also, What would be the correct Jet size I need if I want to go up one size. I read the paper Lars wrote and It said with free flowing exause and headers I should go up one size, what would that side be?
Miles
One of the best things you could do is to wire in an oxygen sensor and to observe whether it's rich or lean versus an indication on a manifold vacuum gauge - then you will know. BTW, there some simple rich-lean indication gauges on the market - I swear by mine as it has helped me know exactly what to do! (12.10@114.5 with a Quadrajet!)
