| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
11-28-2004, 03:47 PM
|
|||
|
|||
OK I have a Qjet 17057204 on a chevy 350 in my firebird, question I have is what jet and metering rods(primary and secondary) would give me the best performance. I have flowtech headers on the car also. Rebuilding the carb so I want to make sure I dont have to mess with it afterwards. Thanks
|
|
#2
11-28-2004, 03:47 PM
|
|||
|
|||
|
OK I have a Qjet 17057204 on a chevy 350 in my firebird, question I have is what jet and metering rods(primary and secondary) would give me the best performance. I have flowtech headers on the car also. Rebuilding the carb so I want to make sure I dont have to mess with it afterwards. Thanks
|
|
#3
11-29-2004, 08:43 AM
|
|||
|
|||
|
It's going to be purely experimental. There is no set rod/jet combination for every engine. The combination will be dependent on whether you have an aftermarket cam, performance intake manifold (and whether it does or does not have EGR), the elevation where the car is driven, the temperature where the car is driven, etc. Even your headers change the combination needs. A good start would be to research what jets and rods the carb came with originally on a Chevy 350 engine for your year and then enrichen it a bit (GM put a really lean set of rods/jets in their cars during the smog era) and work from there. The combination will also be different depending on whether your carb is a 1974 or before, or after 1974 carb, as the rods do not interchange. Post some details about your engine combination and elevation where the car is driven, and I'm sure someone with a 350 engine can give you some specs of what they are running to start off with. The best way to find out is to purchase a stoichiometer from Summit or Jegs and perform some mixture readings while driving. For best performance, you want to have the mixture slightly rich of stoic (about 13:1 ratio). For best economy, you want the mixture to be stoic (about 14.7:1 ratio). Another method is to put the car on a chassis dyno and tune the carb for best hp/torque.
|
|
#4
11-29-2004, 09:00 AM
|
|||
|
|||
|
Basically its a 1977 Chev 350 from a Z28 in a 1980 firebird body. The carb is a 77 as well.elevation is near Toronto, Cam is a mild aftermarket from what I m told, intake is stock, and it has EGR. Thanks TA
|
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
