y 97 Saturn SC1 I can use a different belt and bypass either or both of these without needing any other changes.
Anyone know how much MPG gains I might get by bypassing either or both of these?
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I think on my 97 Saturn SC1 I can use a different belt and bypass either or both of these without needing any other changes.
Anyone know how much MPG gains I might get by bypassing either or both of these? |
expect 3-5mpg
expect 3-5mpg
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I'm guessing 1-2mpg, but I'm
I'm guessing 1-2mpg, but I'm VERY interested in knowing either way. Are you going to run a controlled experiment in order to determine the exact results?
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Re: I'm guessing 1-2mpg, but I'm
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can you give a bit more info
can you give a bit more info about your testing?
- were these tests conducted at the same ambient temperature? - round trip, or one way? (grade & wind issues) - in a traffic flow, or on your own (aero differences from corridor effect)? - cruise control for testing purposes or manual control? |
The baseline and mods up to
The baseline and mods up to 46.8 mpg were in cold conditions, ie around 30f. The more recent ones were at about 65f. Interestingly enough, all the Saturn gurus were saying my MPG improvements would dissapear with warmer weather and summer gas, but it hasn't happened that I've seen.
All are round trip with same 5 mi warmup trip to starting point back to the same end point with RPM +/- 100 max, and there was no drafting of traffic, ie nothing closer than 50 yards in front of me. Cruise was used for initial tests just to eliminate variability, but I don't plan to use it because I found that I can do much better with a steady foot. Cruise control costs 3 mpg from what I've found as compared to keeping one eye on a TPS and RPM reading. I don't do any of the coasting, shutting off the engine, or driving at 45, or porposing type stuff like I've read here. My point was/is to see what I can get normally driving on the highway at reasonable speeds. Around town I'm getting just under 40 mpg in suburban stop and go driving at an avg of 27 mph. I only mention that for comparison purposes since I consider that kind of driving impossible to use for any kind of test because there are way too many extraneous variables involved. |
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Hey, cheapybob i guess you
Hey, cheapybob i guess you found the site from my link on saturnfans. I was hoping we could get some more saturns on this honda dominated site :P
https://www.gassavers.org/forum_topic/ac_and_power_steering_on_fe.html this thread shows some improvement by removing ac/ps. |
Re: Hey, cheapybob i guess you
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Its Ok, Larry. I won't get
Its Ok, Larry. I won't get mad at you. I just get nervous when everyone is whipping around me doing 75 in the 55 zones. I keep my speeds reasonable, but I can tell people are getting aggravated when they stack up behind me and give me looks when they finally get a slot in the fast lane to get around.
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I'm glad that people drive
I'm glad that people drive reasonably around me, I haven't gotten honked or yelled at or anything except for my friends giving me the finger, :p
Blessed are those from new jersey. |
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Re: Hey, cheapybob i guess you
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Also thanks for the link to the thread. Its sort of odd that removing both PS and AC got him 3.2 mpg, but removing PS alone only got him .3 mpg. I find it hard to believe that just having the AC on the pulley and not running would sap 2.9 mpg from it. If I get some time I'll see if I can find a used idler and belt at a yard and try it both ways under the same weather and traffic conditions. He seems to have a similar test routine to mine, but I noticed his mph was very low 34-36 mph, and different by 2 on the one run as compared to the other, so it can't be open expressway driving, which I like better for a test because it keeps the number of variables to a reduced level. |
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I mean, I wouldn't want my gaslog to drop, right? Screw safety... my gaslog is more important :P |
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The wild one on my test loop is when they merge in 2 lanes from the right and they thin out to becomes the slow lane, but the cars are coming in at 75 and I'm only doing 60. I try to get over, but its tricky with them passing me on both sides. |
Re: Hey, cheapybob i guess you
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So I see you drive 65 on road trips. What do you get for mpg when out on the road doing a steady 65 like that? I get about 50 or 51 out of the Saturn at that speed. Still trying to improve it. |
AC and PS
Well it looks like PS in my xB is a function of engine RPM because with a fast idle cold on a warm day I get a lot less assist than when it is turning 650rpm. Also turns out my AC compressor is always turning no clutch just a variable compressor spiral. I don't see a big difference in MPG but I have not used it a lot yet. PS drain may be first to change the fluid to Synlube tomorrow.
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Last summer I got 46mpg going 70-75 with four people in the car and AC blazing. |
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not having ps is no big deal
not having ps is no big deal at all until you put drag radials on.
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P/S pump cutout
I always wondered why the P/S pump has never been made with a cutout clutch the way the A/C compressors are. Above about 25 mph, I doubt any car needs P/S. I once had a car that lost a P/S pressure hose. It was pretty kantankerous below 10 mph w/o P/S, but above that I didn't miss it at all.
If the v-belt itself saps that much engine power, why haven't more cars been made with other types of P/S as the VUE and NSX have? Just curious. |
variable assist
My Scion has a variable assist PS - only works at low engine rpm and then they took the clutch off the AC compressor so you can't win.
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