Intake System questions
12-12-2007, 01:05 PM
#1
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Intake System questions
I have a little Project on It's way.
I have a set of ITB(Individual Throttle Bodies) off of a GXSR 1000. I have the Machine shop at my work making me a Plate and runners to mount to the ITBs. But heres my question,what Sensors are involved in the intake aspect of the engine cycle. I know there is the MAP, Manifold Air Pressure, I believe thats what it stands for and the MAF, Mass Air Flow. How do these to interact and what, where do the measure?
I have a set of ITB(Individual Throttle Bodies) off of a GXSR 1000. I have the Machine shop at my work making me a Plate and runners to mount to the ITBs. But heres my question,what Sensors are involved in the intake aspect of the engine cycle. I know there is the MAP, Manifold Air Pressure, I believe thats what it stands for and the MAF, Mass Air Flow. How do these to interact and what, where do the measure?
12-12-2007, 05:07 PM
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12-12-2007, 06:33 PM
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I'm not sure exactly what you mean, but are you putting individual TB's for all 4 cylinders?
Also, why would you do this?
what are you looking to gain out of this obviously complicated procedure?
Also, why would you do this?
what are you looking to gain out of this obviously complicated procedure?
12-12-2007, 06:43 PM
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I know the ECU reads MAP and MAF, I'm trying to figure out how to make sure I'm still reading the same parameters.
12-12-2007, 06:54 PM
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The MAF signal is easy the TB's need to pull air from the same main pipe. Just install the MAF upstream and let it eat. For the MAP to work its got to have access to manifold pressure and unfortunately with 4 individual TB's the only thing I can think might work is use 4 separate sensors wired together to provide an average number for the computer.
12-12-2007, 07:58 PM
#8
i wouldnt even bother...stick to the 2.4 manifold, raise compression like a ****, raise your redline (stand alone?), and get new cams...you can reach about 250hp with this. if you still want more, THEN i'd go ITB, as ITBs are a difficult mod and shouldnt be the first mod in going NA. You'd also need to upgrade your valvetrain and get some neutral balance shafts in order to rev over 8kRPM
NA power on a 4 cyl is expensive...but if you really want to, just do as i said.
NA power on a 4 cyl is expensive...but if you really want to, just do as i said.
12-13-2007, 02:34 AM
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that would be an engineering marvel if could get to perform BETTER than a larger single tb. you would have tune the hell out of the pcm to make work efficiently with 4 tbs. i would rather make a custom intake manifold and bolt on a huge tb from a ls7 to get better performance. but if u really want to do it get ready to spend some cash. IMO it would be an exotic feature but not practical for performance for a cobalt.
12-13-2007, 08:30 AM
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12-13-2007, 10:00 AM
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The MAF signal is easy the TB's need to pull air from the same main pipe. Just install the MAF upstream and let it eat. For the MAP to work its got to have access to manifold pressure and unfortunately with 4 individual TB's the only thing I can think might work is use 4 separate sensors wired together to provide an average number for the computer.
i wouldnt even bother...stick to the 2.4 manifold, raise compression like a ****, raise your redline (stand alone?), and get new cams...you can reach about 250hp with this. if you still want more, THEN i'd go ITB, as ITBs are a difficult mod and shouldnt be the first mod in going NA. You'd also need to upgrade your valvetrain and get some neutral balance shafts in order to rev over 8kRPM
NA power on a 4 cyl is expensive...but if you really want to, just do as i said.
NA power on a 4 cyl is expensive...but if you really want to, just do as i said.
that would be an engineering marvel if could get to perform BETTER than a larger single tb. you would have tune the hell out of the pcm to make work efficiently with 4 tbs. i would rather make a custom intake manifold and bolt on a huge tb from a ls7 to get better performance. but if u really want to do it get ready to spend some cash. IMO it would be an exotic feature but not practical for performance for a cobalt.
12-14-2007, 02:29 AM
#12
for the map sensor, and other vacume uses, you need to conect a hose to each throttle body and run that to a small canister. the reason being is that with an itb setup you have very little vacume. that leads to the mext big problem, tuning. usualy an engine will idle at 20" vacume, typically an itb will have less than 5". being we do use a maf sensor, it releaves a bit of the tuning nightmare, however it still is very tough to get it tuned right.
12-14-2007, 02:46 AM
#13
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Don't ever think becuase something works on a Honda it will work on our cars we are a completely different breed
12-14-2007, 07:20 AM
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for the map sensor, and other vacume uses, you need to conect a hose to each throttle body and run that to a small canister. the reason being is that with an itb setup you have very little vacume. that leads to the mext big problem, tuning. usualy an engine will idle at 20" vacume, typically an itb will have less than 5". being we do use a maf sensor, it releaves a bit of the tuning nightmare, however it still is very tough to get it tuned right.
01-07-2008, 05:21 AM
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