so after lookin up several aftermarket aluminum intake manifolds for a few different cars, i have become slighlty confused. most of the manifolds were listed as "not recomended for a street car" and saying things like "decreased drivability." so how exatly does an increased airflow, flowing more freely make a car harder to drive? it seems like it would become EASIER to drive, since your getting a better flow into your engine and more than likley improved gas milage from the better flow. maybe.
am I missing something here? is there something to this that i havnet thought of? can someone please explain how this would decrease day-to-day driveability on a car? thanks
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Mike wrote:The auto to manual swap is not as involved as you would think.
Get all the parts you need in a pile, and drive the car into it.
They will find their way into the correct places.
Most aftermarket intake manifolds will increase your ability to flow air into the engine, but will also move your power band up higher, sometimes decreasing bottom end torque which means a loss in drivability. Also in extreme examples, you might not have enough vacuum at lower rpms and that can cause issues with vacuum assisted items, but nothing a vacuum canister can't usually fix. Also with our cars because of our air metering system, you pretty much have to tune for any major improvements in air flow to see the best results.
For our cars there really aren't many choices to be honest. I know for the LD9 there is the Low Output and the High Output manifolds, and I believe Venom makes or did make a manifold.
For the L61 Ecotec there is the stock manifold, and the manifold from the 2.4L Ecotec (LE5?) and possibly, (I can't remember correctly) a saab intake manifold (might be exhaust, can't remember). And there are the independent throttle bodies that people keep posting, but those are impractical for a street car.
And for both engines there are custom sheet metal intake manifolds.
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<<<<<2003 Sunfire Sedan>>>>>
thred jackin...
how would u connect a vacuum canister, in-line or t-off the vacuum line, cuz im sure i dont have any header leaks but it sputters a little at low rpms, and whats a good canister or size to go with?
Kill list:03 eclipse, 06 GTO, 04 Mach 1 Mustang
I believe it is in-line.
This pdf from crane cams website might help:
Vacuum reservoir installation instructions
This one from summit has three holes: First hole is the inlet, second hole is for a vacuum guage (or you could plug it), third hole is the outlet:
SUM-G1464
Also they can be found in the junkyard on many cars, or you could make your own (just use strong enough plastic so it doesn't collapse under vacuum)
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<<<<<2003 Sunfire Sedan>>>>>
tight i have an oil catch can i never used that im gonna try it on first
Kill list:03 eclipse, 06 GTO, 04 Mach 1 Mustang
Does your oil catch can happen to have a check valve on the inlet? because i'm thinking that without that the vacuum won't be "stored" just free flowing in and out. you only want the vacuum going from the engine to the system. The summit one as well as the crane cams one have check valves. A reservoir MUST be installed properly for safety reasons.
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<<<<<2003 Sunfire Sedan>>>>>
oh i see how it works now, guess ill order
Kill list:03 eclipse, 06 GTO, 04 Mach 1 Mustang
