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Revs to high on interstate, pnp switch. 850 1993

posted by  someone claiming to be VIRUSX33 on  Sun Jul 24 12:27 CST 2005 [RELATED]

Well i have just purchased this 93 850 and i do alot of interstate driving. My question is about engine speeds at high mph. For example at 80 or so i am at around 3000 rpm. Is my overdrive not working or something? I mean on roadtrips i cruise at 95 or so lol and i cant imagine the rpm then. I bought this car in order to save money on gas (my other car is an 03 ford cobra and i get about 14 mpg with my driving.) Thank you all for your help. by the way i am having the pnp switch problem, not shifting and staying in 3rd gear, could that be a reason.(I have counted the gears and i am in 4th when on the interstate not 3rd) also where can i get a good pnp switch? Thanks again.








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Revs to high on interstate, pnp switch. 850 1993

posted by  someone claiming to be ksg on  Mon Jul 25 09:19 CST 2005 [RELATED]

By my calculations if you have a normally aspirated car with 15 inch wheels you would do about 3000 rpm at 80. With the turbo and 16 inch wheels you would be at about 2700. This assumes a final drive ratio of 2.74 for the NA and 2.54 for the turbo (numbers from Volvo website) and also that they include the overdrive ratio in those numbers. It also assumes 60 aspect ratio tires. I have a NA with 15 inch wheels and do about 3000 rpm at 76-78 mph. My gearbox operates normally with lockup and no slip I am aware of.

I think until the pnp switch fails altogether and the gearbox goes into safe mode (always in 3rd no matter what and check engine goes on) it would not be suspect. The pnp problems seem to start by occurring mostly when first engaging the gears, not in steady running. Then they get worse gradually.








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Revs to high on interstate, pnp switch. 850 1994

posted by  info2x on  Mon Jul 25 06:52 CST 2005
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last visit: Tue Feb 27 07:19 CST 2007
[RELATED]

Are you sure you're in the fourth gear? I have a 94 850 and between the 3rd and 4th gear the tranny goes through "lock up" which feels like another gear when in fact it is not. If you look at the user's manual it explains this.

As for the PNP switch I'm going to get mine through FCP Groton for about $110 for the OEM Volvo one. There is an aftermarket PNP switch there as well which is cheaper.
--
-INFO2X
1994 Volvo 855
1985 Volvo 245DL "The Silver Bullet"








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Revs to high on interstate, pnp switch. 850 1993

posted by  info2x on  Mon Jul 25 06:52 CST 2005
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Tue Feb 27 07:19 CST 2007
[RELATED]

Are you sure you're in the fourth gear? I have a 94 850 and between the 3rd and 4th gear the tranny goes through "lock up" which feels like another gear when in fact it is not. If you look at the user's manual it explains this.

As for the PNP switch I'm going to get mine through FCP Groton for about $110 for the OEM Volvo one. There is an aftermarket PNP switch there as well which is cheaper.
--
-INFO2X
1994 Volvo 855
1985 Volvo 245DL "The Silver Bullet"







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