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> When to shift
ScottWinchester
post Jan 18 2018, 10:15 AM
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Hello everyone, I just bought a 1975 Porsche 914 2.0 and looking for some help. My first question is when do I shift? Don't laugh please am NEW!

My friend says since its a VW motor that I should shift out of 1st at about 2500rpm, then at 3500 each gear after... and never let the rpm drop below 3000rpm even when on the highway.

Is he right? I have been running around shifting about 3000 but when cursing around keeping it about 2500.

Scotty
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Dr. 914
post Jan 18 2018, 11:45 AM
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best thing is to listen to the sound of the engine and feel the engine laboring. When really accelerating in a hurry, you can rev it to the red line, but most of the time you want to get into the highest gear as soon as possible so 3400 shifts are normal
You will feel the power band and when the engine drops off with no power so will learn not to drive it at such low rams with no power. The four cylinder is much different than the big v-8 models

QUOTE (ScottWinchester @ Jan 18 2018, 11:15 AM) *
Hello everyone, I just bought a 1975 Porsche 914 2.0 and looking for some help. My first question is when do I shift? Don't laugh please am NEW!

My friend says since its a VW motor that I should shift out of 1st at about 2500rpm, then at 3500 each gear after... and never let the rpm drop below 3000rpm even when on the highway.

Is he right? I have been running around shifting about 3000 but when cursing around keeping it about 2500.

Scotty
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74-914-1.8-Org-O...
post Jan 18 2018, 01:21 PM
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I always go by sound and feel, but the official answer ...

1974 Owner's Manual Page 31
Shifting Gears

The fully synchronized transmission permits shifting into any gear without double-clutching. Make sure that the clutch pedal is fully depressed and the selected gear fully engaged. The following maximum engine speeds must not be exceeded when down-shifting (applies to standard gear ratios only) :
5-speed transmission th5 to 4th gear = 3900 rpm th4 to 3rd gear = 3600 rpm rd3 to 2nd gear = 3400 rpm nd2 to 1st gear = 2500 rpm

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Dr. 914
post Jan 19 2018, 01:33 PM
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good point, often times owners let the clutch cable get out of adjustment and the gears start to grind eventually ruining a perfectly good transmission. Because the 914 clutch cable rolls around a roller, it is more prone to lose adjustment. Look at your pedals they should be at the same height, and if you can pull up on the clutch pedal, it has too much slack in it.

QUOTE (74-914-1.8-Org-Owner @ Jan 18 2018, 02:21 PM) *
I always go by sound and feel, but the official answer ...

1974 Owner's Manual Page 31
Shifting Gears

The fully synchronized transmission permits shifting into any gear without double-clutching. Make sure that the clutch pedal is fully depressed and the selected gear fully engaged. The following maximum engine speeds must not be exceeded when down-shifting (applies to standard gear ratios only) :
5-speed transmission th5 to 4th gear = 3900 rpm th4 to 3rd gear = 3600 rpm rd3 to 2nd gear = 3400 rpm nd2 to 1st gear = 2500 rpm

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Malcolm2
post Apr 20 2018, 07:33 AM
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Just to add my 2 cents to this old post. No one mentioned COOLING. Cruising at low rpm will not cool the heads properly. Do not run on the interstate in 5th under 3000 rpm. IIRC 70 mph in my car in 5th is ~3400 rpm. Trick is on hills you need to keep the rpm UP. down shift to keep them over 3000. Try to keep the rpm at 3000 or higher for all speeds.

I added a Cylinder Head Temp gauge. VDO brand that is NLA. They aren't perfect, but will show you changes. 350 *F at 70 mph is good. Up that hill you will see 375, 400 on steep long mountain runs. Slow down and keep the RPM up and don't go over 425.

These are AIR COOLED engines, they get their air from the engine.
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jockellis
post May 1 2018, 07:30 PM
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I seem to remember that 70 mph came at about 3,000 on my 73 1.7. The salesman at Brumos told me they were trying to stretch gas mileage as gas prices were rising rapidly at that time. My two 356s and 912 were only hitting 60 per at 3,000 revs.
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jockellis
post Jul 13 2018, 07:45 PM
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Malcolm, a chap here in Cumming has cht sensors on all four cylinders of his Beck 550. Is that overkill and will just one give you something to worry about unnecessarily?
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