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Noob question about cams.

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Old 02-03-2011, 12:08 PM   #1
Dragonus18
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Default Noob question about cams.

Ok. Cams sound sexy. Lets get that out of the air. Hence why I want them. Now here's my question that I couldn't find answers too by using the search button or calling manufacturers. I understand that when you're stepping on it that cams make you waste more gas. I'm cool with that but the one thing that no one can seem to answer to me is that when I'm not stepping on it and I'm just driving around normally (because my car is a daily driver) will it make me waste more gas or will I have the same gas mileage as before? I know that a lot of people aren't concerned with this but if you're going to daily drive a car its got to get decent gas mileage. I get about 250miles out of a tank in my GT and it's got a procharger P-1SC stage 2 kit on it and when I drive it normally I still get 18 city/25-35 highway.
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Old 02-03-2011, 12:33 PM   #2
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Yes your mpg will get worse if you are getting on WOT or not. Be more when on WOT all the time but even driving conservative, mpg will be down a bit with cams.

A lot depends on which cams you get though. I put the Comp Thumpr cams in my 06 GT and my mpg dropped 1 to 1.5 mpg.
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Old 02-03-2011, 01:10 PM   #3
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Originally Posted by Franchi View Post
Yes your mpg will get worse if you are getting on WOT or not. Be more when on WOT all the time but even driving conservative, mpg will be down a bit with cams.

A lot depends on which cams you get though. I put the Comp Thumpr cams in my 06 GT and my mpg dropped 1 to 1.5 mpg.
I was looking at getting blower cams since I have a procharger kit on my stang. I called trickflow and the guy told me that stage 2 cams don't kill gas during normal driving conditions "he thinks." I need to be certain before I put them on because once I put them on there's no going back and I do a decent amount of driving. I need my MPG.
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Old 02-03-2011, 01:13 PM   #4
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I think a lot of that simple has to do with that duration the cam spec are running. I know Brenspeed came out with some Detroit Rocker cams ground specifically for blowers but how that application relates to the mpg, I dunno to be honest.
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Old 02-03-2011, 01:32 PM   #5
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I think a lot of that simple has to do with that duration the cam spec are running. I know Brenspeed came out with some Detroit Rocker cams ground specifically for blowers but how that application relates to the mpg, I dunno to be honest.
I appreciate the feedback and honesty. Is there someone else out there that knows perhaps?????
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Old 02-03-2011, 01:56 PM   #6
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Depending on the amount of overlap, duration, etc, gas mileage will decrease a bit. It's just a byproduct of the design. When i did mine, my MPG's dropped a little, but i didn't buy the car for economy lol.

What cams are you looking at besides Trick Flow?
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Old 02-03-2011, 04:18 PM   #7
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I remember when I was researching getting a stage 2 heads and cam combo from MHS, Nick told me I should expect about a 2mpg loss in the city.. so I would assume cams by themselves wouldnt exceed that
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Old 02-03-2011, 04:37 PM   #8
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depends on the cam and theres no way you get 35 highway sorry...
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Old 02-03-2011, 07:47 PM   #9
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check out MHS for cams (www.modularheadshop.com)
you gotta pay to play. your willing to pay the expense for cams and yet are worried about MPG?
IMO, spend the 600-1000 you'd spend on cams and buy a POS honda or something to save gas. or swap to a lower gear ratio.

blower cams wont be as aggressive as you might think either. nothing like some good N/A cams. you'll need to be careful with too aggressive a cam too, because you can push the valve into the top of the piston. dunno how much boost your pushin with your p1sc either, but you might be very close to the limit of a stock block, unless you've built it.
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Old 02-03-2011, 09:26 PM   #10
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Quote:
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check out MHS for cams (www.modularheadshop.com)
you gotta pay to play. your willing to pay the expense for cams and yet are worried about MPG?
IMO, spend the 600-1000 you'd spend on cams and buy a POS honda or something to save gas. or swap to a lower gear ratio.

blower cams wont be as aggressive as you might think either. nothing like some good N/A cams. you'll need to be careful with too aggressive a cam too, because you can push the valve into the top of the piston. dunno how much boost your pushin with your p1sc either, but you might be very close to the limit of a stock block, unless you've built it.
This is once I've built it of course and to 98 red stang I know what I got. I had it tuned for good gas mileage. I was driving 55mph, windows up, cruise control on, and A/C off. Get my mods and tune it for gas mileage and THEN you can tell me I'm lying. I didn't start this thread to argue with you. I have a question and I want info on it. Plain and simple. If you don't want to contribute than get lost so I can read the responses of less judgmental people who are willing to help me get knowledge on the subject matter.
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Procharger P-1SC stage 2 unit/ intercooled
BBK Longtube ceramic coated headers
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Borla cat-back exhaust
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Old 02-03-2011, 10:47 PM   #11
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i wasnt tryin to disrespect you or anything, i was just sayin.
if you really want to save gas with the stang, like i said, go with a lower gear ratio. you could maybe get a T56 viper spec with .50 6th gear, with some 2.73's. that'd get you some MPG pickup on the highway, but you'd spend a ton in cash and down time before hand. but honestly, by the time you do all that, you'd be better off just buyin another beater car to putt around in and get 30-35 mpg without having to give it a second thought.

i was gettin about 225-245 miles a tank constantly(11-12 gallons), A/C on, 75-80 mph highway. with about 8-12 times per tank hitting 8lbs of boost for a couple seconds to get away from toll booths/on-ramps. this was with 3.73's and turbo. of course the turbo's a whole different beast since it doesnt cause much if any drag during low load operations.

its really hard to tell you how much it would drop, because there's just too many variables, how big of a cam you go, how good your tune is, how hard you are on the pedal, gears + trans, climate. it will all contribute to your gas milage. maybe you could try one of those Hydrogen generators? one guy around here was claimin he picked up some MPG with one of those on his miata.
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Old 02-04-2011, 08:26 AM   #12
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Quote:
Originally Posted by Dragonus18 View Post
This is once I've built it of course and to 98 red stang I know what I got. I had it tuned for good gas mileage. I was driving 55mph, windows up, cruise control on, and A/C off. Get my mods and tune it for gas mileage and THEN you can tell me I'm lying. I didn't start this thread to argue with you. I have a question and I want info on it. Plain and simple. If you don't want to contribute than get lost so I can read the responses of less judgmental people who are willing to help me get knowledge on the subject matter.
Hey buddy why dont you relax. You just started on here and if this is gonna be your attitude to people no one is going to help you. I have a lot more respect on here and know a hell of a lot more than you. Im not trying to argue but since you started it. I dont care what your tuned for everyone on here will agree that theres no way in hell your getting anywhere near 35. I dont care if you were rolling downhill with the windows up in neutral. All i was saying is there is no way you got 35mpg. Not trying to pick a fight so relax.
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Old 02-04-2011, 11:49 AM   #13
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Agreed with that last post, and also raising the BS flag. My 00 with a D1SC and 42lb injectors was re-tuned last month and I'm lucky to get 12 with a tail wind. I only wish that I could get better mileage...


OP, what size injectors are you running?
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Old 02-04-2011, 07:34 PM   #14
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If you got money for a blower and to install cams what is 2-3 mpg's. If your DD and you looking for mpgs don't add blower cams. Also, blower cams sound much different than n/a cams. Therefore only way to obtain choppy idle with blower cams is to go with a stage III or custom grind. Depending on manufacturer you may need to fly cut your pistons.

With my set-up I see 12 mpg's but a tad different than your setup.
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Old 02-04-2011, 07:50 PM   #15
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Quote:
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If you got money for a blower and to install cams what is 2-3 mpg's. If your DD and you looking for mpgs don't add blower cams. Also, blower cams sound much different than n/a cams. Therefore only way to obtain choppy idle with blower cams is to go with a stage III or custom grind. Depending on manufacturer you may need to fly cut your pistons.

With my set-up I see 12 mpg's but a tad different than your setup.
I have the money but just like everyone else here I have a goal. Apparently my goal is different than everyone else's but I'm determined to achieve my goal. It's not impossible to achieve this and I know it. I know city MPG may not change much but I know I can do something about highway mpg. It always takes someone to be the lab rat to try what no one else wants to try (or so it seems but I could be wrong) because it's harder to achieve. Anything worth doing in life is difficult. This is why I'm shooting for the stars and will stop at nothing to achieve it because most people quit when they're closest to achieving their goals. I will not be a statistic. I know it can be done and with the great knowledge I've obtained from this site and the great people that inhabit it I know I can achieve my goals.
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Procharger P-1SC stage 2 unit/ intercooled
BBK Longtube ceramic coated headers
BBK off road X-pipe
Borla cat-back exhaust
BBK 78mm throttle body/ plenum
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Old 02-04-2011, 07:50 PM
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