Fuel Octane Requirement
08-27-2006, 05:30 PM
#31
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
It's suggested to fill up with higher-octane fuel before going for emissions testing. So if the emissions are better, it's burning cleaner, no? Doesn't that help performance and help the engine run better?
I always fill up with at least 91.
I always fill up with at least 91.
08-27-2006, 06:15 PM
#32
Three Wheelin'
Join Date: Jun 2003
Location: Phoenix, Az
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by J Silverman
87 was 9.7:1 88 was 10.2:1. For the higher compression motors the facotry says to use 91 octane, so I wouldnt use anything less.
08-27-2006, 06:18 PM
#33
Burning Brakes
Join Date: Aug 2005
Location: Burke, VA
Posts: 1,096
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by bearone
the 87/88S models had the higher compression, no diff on the na or 951 for the two years.
08-27-2006, 06:52 PM
#35
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
88 and 89 N/As use the Euro pistons which increase the compression ratio to 10.2:1 and 10.9:1 respectively.
Production year 87 had a higher compression ratio than previous years as stated above.
Production year 87 had a higher compression ratio than previous years as stated above.
08-27-2006, 07:41 PM
#36
Three Wheelin'
Join Date: Jun 2003
Location: Phoenix, Az
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by The DareDevil
88 and 89 N/As use the Euro pistons which increase the compression ratio to 10.2:1 and 10.9:1 respectively.
Production year 87 had a higher compression ratio than previous years as stated above.
Production year 87 had a higher compression ratio than previous years as stated above.
944 (1987 - 1988)
Engine M44/07 - 09
Number of Cylinders 4
Bore 100 mm
Stroke 78.9 mm
Displacement 2479 cm3
Compression Ratio 10.2 : 1
Horsepower DIN 158 @ 5900 RPM
Max. Torque SAE 140 ft-lb @ 3000 RPM
Acceleration (0-60 mph) ?
Top Speed ?
89 was a 2.7
08-28-2006, 04:31 AM
#37
Three Wheelin'
Join Date: May 2004
Location: Downtown Los Angleles & Denton TX
Posts: 1,845
Likes: 0
Received 1 Like
on
1 Post
My old 85.0 would run better using 87 ( or the cheapest I could find ).
For some reason, it would.
Plus I had the FQS set to 4 degrees which helped.
I also had a very strange DME, it doesn't look like any other early DME (as far as the circuit boards), so that may have something to do with it.
I just got this 85.5/86 and I'm in the process of finding the best settings and gas octane for my needs.
Don
Also, on the gas door flap it says 92 octane
For some reason, it would.
Plus I had the FQS set to 4 degrees which helped.
I also had a very strange DME, it doesn't look like any other early DME (as far as the circuit boards), so that may have something to do with it.
I just got this 85.5/86 and I'm in the process of finding the best settings and gas octane for my needs.
Don
Also, on the gas door flap it says 92 octane
08-28-2006, 05:06 AM
#38
RL Community Team
Rennlist Member
Rennlist Member
I read somewhere (today, actually) that all 944s starting in 85.5 got knock sensors.
My mom consistently uses 89 in her car. She commutes to work about 50 miles round trip, and the car runs smooth and has good power. In my 944 I used to use 89 as well, though once I tried 87 and hardly noticed any difference. I think it ran a little less smooth but maybe it was just my imagination. Later I tried using 91 just because I felt like it. The sticker on the gas door read 91 oktan min. and I always thought about using 91, so I just tried it. I really could notice a difference! It ran a little smoother, and was noticeably more powerful (I'm talking like 5-7 hp not 40 hp).
If you want max performance and/or feel an obligation to treat your car like you'd treat your girlfriend, then use 91. Anything higher than 91 is not necessary for a plain 944. If you just want to drive it around then use 89, and if you really don't care then 87 is apparently fine too.
My mom consistently uses 89 in her car. She commutes to work about 50 miles round trip, and the car runs smooth and has good power. In my 944 I used to use 89 as well, though once I tried 87 and hardly noticed any difference. I think it ran a little less smooth but maybe it was just my imagination. Later I tried using 91 just because I felt like it. The sticker on the gas door read 91 oktan min. and I always thought about using 91, so I just tried it. I really could notice a difference! It ran a little smoother, and was noticeably more powerful (I'm talking like 5-7 hp not 40 hp).
If you want max performance and/or feel an obligation to treat your car like you'd treat your girlfriend, then use 91. Anything higher than 91 is not necessary for a plain 944. If you just want to drive it around then use 89, and if you really don't care then 87 is apparently fine too.
08-28-2006, 08:14 AM
#39
Originally Posted by FRporscheman
I read somewhere (today, actually) that all 944s starting in 85.5 got knock sensors.
My mom consistently uses 89 in her car. She commutes to work about 50 miles round trip, and the car runs smooth and has good power. In my 944 I used to use 89 as well, though once I tried 87 and hardly noticed any difference. I think it ran a little less smooth but maybe it was just my imagination. Later I tried using 91 just because I felt like it. The sticker on the gas door read 91 oktan min. and I always thought about using 91, so I just tried it. I really could notice a difference! It ran a little smoother, and was noticeably more powerful (I'm talking like 5-7 hp not 40 hp).
If you want max performance and/or feel an obligation to treat your car like you'd treat your girlfriend, then use 91. Anything higher than 91 is not necessary for a plain 944. If you just want to drive it around then use 89, and if you really don't care then 87 is apparently fine too.
My mom consistently uses 89 in her car. She commutes to work about 50 miles round trip, and the car runs smooth and has good power. In my 944 I used to use 89 as well, though once I tried 87 and hardly noticed any difference. I think it ran a little less smooth but maybe it was just my imagination. Later I tried using 91 just because I felt like it. The sticker on the gas door read 91 oktan min. and I always thought about using 91, so I just tried it. I really could notice a difference! It ran a little smoother, and was noticeably more powerful (I'm talking like 5-7 hp not 40 hp).
If you want max performance and/or feel an obligation to treat your car like you'd treat your girlfriend, then use 91. Anything higher than 91 is not necessary for a plain 944. If you just want to drive it around then use 89, and if you really don't care then 87 is apparently fine too.
You read wrong, or something written by an idiot (very common)
I have had quite a few 87/88 NA's through my garage( one is making almost 700 HP in my turbo right now) and NONE of them had knock sensors. They have a small heat shield, and the threaded provision for it, but no sensor.
The final year of 2.5 NA, doesn't even have connector on the harness for it.
08-28-2006, 01:56 PM
#41
Race Director
Guys,
83-87 NA's all have 9:7:1 pistons. These take 87 and are fine.
88 NA's have 10.2:1 pistons and I would use at least 91 in these
89's are 10+ I think and would use 91
The 944S used 10.9:1 CR and needs 91 octane.
The 87 NA (both in the 944 and 924S) are the low compression motors.
Euro 82-87 use 10.6:1, but everyone used 10.2:1 in 88.
Man there is SO MUCH miss information in this thread it makes me SICK!
83-87 NA's all have 9:7:1 pistons. These take 87 and are fine.
88 NA's have 10.2:1 pistons and I would use at least 91 in these
89's are 10+ I think and would use 91
The 944S used 10.9:1 CR and needs 91 octane.
The 87 NA (both in the 944 and 924S) are the low compression motors.
Euro 82-87 use 10.6:1, but everyone used 10.2:1 in 88.
Man there is SO MUCH miss information in this thread it makes me SICK!
08-28-2006, 02:27 PM
#42
Three Wheelin'
Join Date: Jun 2003
Location: Phoenix, Az
Posts: 1,854
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by M758
Guys,
83-87 NA's all have 9:7:1 pistons. These take 87 and are fine.
88 NA's have 10.2:1 pistons and I would use at least 91 in these
89's are 10+ I think and would use 91
The 944S used 10.9:1 CR and needs 91 octane.
The 87 NA (both in the 944 and 924S) are the low compression motors.
Euro 82-87 use 10.6:1, but everyone used 10.2:1 in 88.
Man there is SO MUCH miss information in this thread it makes me SICK!
83-87 NA's all have 9:7:1 pistons. These take 87 and are fine.
88 NA's have 10.2:1 pistons and I would use at least 91 in these
89's are 10+ I think and would use 91
The 944S used 10.9:1 CR and needs 91 octane.
The 87 NA (both in the 944 and 924S) are the low compression motors.
Euro 82-87 use 10.6:1, but everyone used 10.2:1 in 88.
Man there is SO MUCH miss information in this thread it makes me SICK!
944 (1987 - 1988)
Engine M44/07 - 09
Number of Cylinders 4
Bore 100 mm
Stroke 78.9 mm
Displacement 2479 cm3
Compression Ratio 10.2 : 1
Horsepower DIN 158 @ 5900 RPM
Max. Torque SAE 140 ft-lb @ 3000 RPM
Acceleration (0-60 mph) ?
Top Speed
87951
08-28-2006, 03:01 PM
#43
Drifting
Join Date: Dec 2002
Location: Phila.
Posts: 2,290
Likes: 0
Received 0 Likes
on
0 Posts
actually, it goes something like this
83-86 944 9.5:1 M44/01, 02, 03, 04, 05, 06
87 944 and 924S 9.7:1 M44/07
88 944 and 924S 10.2:1 M44/08
everything else looks good Joe
83-86 944 9.5:1 M44/01, 02, 03, 04, 05, 06
87 944 and 924S 9.7:1 M44/07
88 944 and 924S 10.2:1 M44/08
everything else looks good Joe