Originally Posted by Robbie94gt
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.