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Old 03-16-2012, 12:03 PM   #1
Caveman
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Default F.A.S.T. intake manifold

I am looking at replacing my LS-1 intake manifold and throttle body with a 102mm F.A.S.T. Intake Manifold and 92mm throttle body. I believe the existing manifold is 75mm.

Apart from just performing a straight replacement, are there any other things to consider? Will the engine management software automatically compensate for the increased airflow? I don't want to lean it out and cook the motor. How do I adapt the bellows, or do I need to buy a new one? I talked to F.A.S.T. (Fuel Air Spark Technology), but didn't get a warm and fuzzy feeling with their answers.
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Old 03-19-2012, 09:43 AM   #2
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Just about anytime you mess with air flow through a motor you will need a tune. Sounds like that is a drastic change so I would think that you would more than likely need to get a tune for it to be safe.
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Old 03-20-2012, 06:07 PM   #3
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As long as this car uses a MAF and not a speed density setup from the factory the stock ECU should be able to easily compensate for the increased airflow.

If it is on Speed Density then the tune would certainly need a change to be correct whenever you make a change to the engine system on the car.
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Old 03-20-2012, 08:53 PM   #4
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Thanks for the help guys. I appreciate it. I do miss the days when all you had to do was figure out which jets to use when switching from a Quadrajet to a Holley 850 double-pumper.

I never took the time to understand this new engine technology. Sometimes I feel like a dinosaur - how many of you out there remember when the dimmer switch used to be on the floorboard?
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Old 03-21-2012, 10:09 PM   #5
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lol at the dimmer switch comment.I agree with dave that the ecu should be able to figure it out.
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Old 03-22-2012, 05:19 AM   #6
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The ECU will compensate and you will most likely not see much of a lean condition. Well at least nothing a N/A engine can't handle.
The big thing is once you change the runner volume and length which that manifold does you change the required fuel map. Basically you are not using the new found power unless you get a tune. I am surprised FAST didn't just tell you that?
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Old 03-27-2012, 12:25 AM   #7
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Quote:
Originally Posted by Caveman View Post
Thanks for the help guys. I appreciate it. I do miss the days when all you had to do was figure out which jets to use when switching from a Quadrajet to a Holley 850 double-pumper.

I never took the time to understand this new engine technology. Sometimes I feel like a dinosaur - how many of you out there remember when the dimmer switch used to be on the floorboard?
i do. my first car was like that..... i'm only 27 and things like direct injection baffle me. i'm used to multiport, or throttle body injection. and can figure out a carb if a absolutly had to.
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