 Rear axle ratio?, Whats normal RPM at 70 MPH |
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| bernbomb914 |
 Mar 28 2003, 04:35 PM
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#1
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one of the oldest Farts on this board  Group: Benefactors Posts: 1,873 Joined: 29-December 02 From: Temecula, CA Member No.: 36   |
It seems like my engine revs a lot at freeway speeds. The oil temp comes up to the danger level if I run at these speeds for any length of time. (3400 rpm at 70 mph) I have a 1.8 with FI and it runs normal to rich? cleaned the oil cooler put in new flaps thermo. what could be causing this problem.
Bernie (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/flag.gif) |
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Replies(1 - 12)
| Brad Roberts |
Mar 28 2003, 04:57 PM
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#2
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
What size tire Bern ??
3400 is a couple 100 rpm over what I think it should be. B |
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| bernbomb914 |
Mar 28 2003, 05:11 PM
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#3
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one of the oldest Farts on this board Group: Benefactors Posts: 1,873 Joined: 29-December 02 From: Temecula, CA Member No.: 36 |
B.
they are 195x60 15s hp4s Bernie |
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| bernbomb914 |
Mar 28 2003, 05:16 PM
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#4
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one of the oldest Farts on this board Group: Benefactors Posts: 1,873 Joined: 29-December 02 From: Temecula, CA Member No.: 36 |
The problem is I installed the 911 guages so I have oil pressure and temp in the dash pod. so now I know. oil pressure drops to 1 duck when it comes to idle when hot.
Bernie |
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| Brad Roberts |
Mar 28 2003, 05:28 PM
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#5
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Bernie,
when hot with regular oil the car might have 15lbs of oil pressure at idle. Synthetic could be a tad LOWER. Do you have the flaps under the firewall ?? All the teeth on the fan ?? Timing set correctly ?? B |
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| SirAndy |
Mar 28 2003, 05:29 PM
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#6
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Resident German Group: Admin Posts: 41,649 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
clutch holding up?
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| Brad Roberts |
Mar 28 2003, 05:31 PM
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#7
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
Bern,
the other thing I see repeatedly: people replacing the oil cooler seals and pinching them half closed during reassembly. B |
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| bernbomb914 |
Mar 28 2003, 06:23 PM
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#8
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one of the oldest Farts on this board Group: Benefactors Posts: 1,873 Joined: 29-December 02 From: Temecula, CA Member No.: 36 |
B
Timing is correct, have flaps, next change will be syn, clutch is good, haven't had motor out to check lines for crimping. have a 2L core engine that I will rebuild and install when I get rich. is a exterior cooler nessessary? Bernie (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/flag.gif) |
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| Aaron Cox |
Mar 28 2003, 06:27 PM
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#9
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
I think i get about 3100-3200 rpms maybe a tad lower in 5th gear while going ~about 70mph...w/ 165 r 15 cooper tires. (IMG:style_emoticons/default/driving.gif)
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| silver six |
Mar 28 2003, 06:35 PM
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#10
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Member Group: Members Posts: 203 Joined: 3-February 03 From: San Bruno, California Member No.: 227 |
Bernie,
I assume you either calibrated your 911 guages to work with your engine's pressure and temp senders or you replaced the senders. If not, you'll get bad readings. Douglas |
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| bernbomb914 |
Mar 28 2003, 08:11 PM
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#11
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one of the oldest Farts on this board Group: Benefactors Posts: 1,873 Joined: 29-December 02 From: Temecula, CA Member No.: 36 |
new senders to match.
Bernie |
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| Dave_Darling |
Mar 28 2003, 11:34 PM
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#12
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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"Druck" is German for "pressure".
1 on the gauge is 1 Bar, or one atmosphere. 1 Bar is about 14.5 PSI. Which is quite enough for your motor at idle--you don't start worrying until you see less than 10 PSI at warm idle. --DD |
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| ChrisFoley |
Mar 29 2003, 05:49 AM
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#13
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I am Tangerine Racing Group: Members Posts: 7,926 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None
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Tire size has no bearing on rpm vs. odometer indicated speed, since both gauges are connected to the engine/gearbox.
There are only two final drive ratios, with the shorter one being about 10% under the stock one. That would put rpm up by more than 300 at 70mph if you had the short R&P installed. That is unlikely in a street car, since the alternate is somewhat rare. I guess it's possible that one of your gauges is calibrated wrong. Perhaps the zero point of the tach is off. The easiest way to test would be to wire up a different tach. |
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