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Join Date: Aug 2004
Location: LaGrange-Chicago Land
Posts: 190
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rpm vs fuel efficiency
Right now my car idles at ~900 rpm, like normal. I think my motor mounts are dieing so the car rumbles a bit. One day I put my foot on the gas and let the car run at 1000 rpm. The rumble went away and I think the car ran more fuel efficient. I looked at the mpg gauge under the tack and it confirmed the fact that the engine ran better. I'm considering adjusting the idle screw to make the car run at 1000 rpm. Are there any reasons why i shouldn't make this change?
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1985.5 Stone Grey 944-SOLD 1987 Yellow 951- For Sale |
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07-28-2005, 07:03 AM
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Fuel use is from load (torq) demand.
Replace the engine mounts.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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07-28-2005, 08:20 AM
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Join Date: Dec 2004
Location: rural central texas
Posts: 173
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hmmmmm...........bad motor mounts make the engine rumble??Learn something new everyday
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89 944 na Dove Blue Metalic 2000 chevy silverado 2000 chevy 454 dually black 79 GMC short bed 4x4 4 quarter horses 89 acura legend GS sedan |
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07-29-2005, 05:32 PM
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Quote:
If you can barely get your finger tips in the gap then you need engine mounts.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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07-29-2005, 08:27 PM
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Join Date: Aug 2004
Location: LaGrange-Chicago Land
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would it be bad if i raised the idle speed anyways?
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1985.5 Stone Grey 944-SOLD 1987 Yellow 951- For Sale |
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07-30-2005, 06:33 AM
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Ornery Bastard
Join Date: Sep 2001
Location: South Sound
Posts: 2,879
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Quote:
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--------- Silver 1998 Volvo S70 T5 <- Daily (Anja) Guards Red 1986 951 <- Seattle car (Gretchen) White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei) |
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07-30-2005, 10:55 AM
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Join Date: Aug 2004
Location: LaGrange-Chicago Land
Posts: 190
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I can stick my fingers between the engine and the crosmember from the back. here's a pic
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1985.5 Stone Grey 944-SOLD 1987 Yellow 951- For Sale |
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07-30-2005, 03:57 PM
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Good deal. Collect your cookie.
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*Disclaimer: The person above is actually dumber than he appears. my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements '84 944 auto/ps/ac/cc '86 951 Providing ignorance one post at a time. |
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07-30-2005, 04:12 PM
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1983 Porsche 944 2.5 liter
'84 Porsche 944 2.5L
