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Old 12-23-2011, 10:14 AM   #1
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vacuum

Hey guys. I just tested my car for vacuum and it was at 17. Pretty steady, barley fluctuated. I was wandering what it should be on a stock motor. Cuz I'm starting to think that somebody put a aftermarket cam in it b4 I got the car. Cuz it has one heck on a lope. It's got all new tuneup on it so it ain't missing. But it has stock heads and intake on it. But the car doesn't run like it should. If u drive it easy it does fine amd u can't tell no problem. And as soon as u get on it it doesn't really pick up very well. Amd it's 5 speed amd 410 gears. I've done all the cleaning amd tunein on the maf/tps/iac anf it idles pretty steady no surges or anything just has a lope. That sounds really good but just don't get up and go like it should. I also checked my compression and it was 120 at all cylinders. Spark plugs look good with mabye 5000 miles on them. Any suggestions ?
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Old 12-24-2011, 01:44 AM   #2
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Re: vacuum

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Originally Posted by Robbie94gt View Post
Hey guys. I just tested my car for vacuum and it was at 17. Pretty steady, barley fluctuated. I was wandering what it should be on a stock motor. Cuz I'm starting to think that somebody put a aftermarket cam in it b4 I got the car. Cuz it has one heck on a lope. It's got all new tuneup on it so it ain't missing. But it has stock heads and intake on it. But the car doesn't run like it should. If u drive it easy it does fine amd u can't tell no problem. And as soon as u get on it it doesn't really pick up very well. Amd it's 5 speed amd 410 gears. I've done all the cleaning amd tunein on the maf/tps/iac anf it idles pretty steady no surges or anything just has a lope. That sounds really good but just don't get up and go like it should. I also checked my compression and it was 120 at all cylinders. Spark plugs look good with mabye 5000 miles on them. Any suggestions ?
Healthy stock engine vacuum is usually in the 19" - 21" range.
A mildly cammed engine is usually in the 15" - 16" range.
A fully built engine can be in the sub 12" range.

In my experience the SN95's do feel sluggish compared the the lighter, earlier fox bodies and it takes a considerable amount of mods to overcome the weight and ECU tuning differences.
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Old 12-24-2011, 07:33 AM   #3
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I only have 9.5" to 10" with my fully built motor. My XR282 cam has an overlap so that is what brought it down, plus the single plane manifold.
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Old 01-08-2012, 10:01 AM   #4
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How do check vacume on 99 mustang
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Old 01-08-2012, 11:07 AM   #5
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Re: vacuum

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How do check vacume on 99 mustang
Hook a vacuum gauge to an intake vacuum port.
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