Carrera 3.2 Performance mystery and Chips (long)
03-14-2008, 12:11 PM
#91
"I really think this is the magic!"
Really? It's called pushing the timing maps or on a 911SC it's called turning the
distributor a few degrees.
And as was mentioned in the same post, tweaking of the fuel maps at part throttle
has basically no effect because of the closed-loop O2 system. And at WOT,
very minor effects result there. And besides the engine is driven at part throttle
the majority of the time anyway. These fuel map issues have been discussed many
times here on Rennlist and other forums.
Really? It's called pushing the timing maps or on a 911SC it's called turning the
distributor a few degrees.
And as was mentioned in the same post, tweaking of the fuel maps at part throttle
has basically no effect because of the closed-loop O2 system. And at WOT,
very minor effects result there. And besides the engine is driven at part throttle
the majority of the time anyway. These fuel map issues have been discussed many
times here on Rennlist and other forums.
03-14-2008, 02:06 PM
#92
Also stock in later '88's (my '88 Carrera came with the "8" chip). I believe the Club Sport chip is identical except for a raised rev limit, need to check my archives to verify.
03-14-2008, 02:09 PM
#93
"I really think this is the magic!"
Really? It's called pushing the timing maps or on a 911SC it's called turning the
distributor a few degrees.
And as was mentioned in the same post, tweaking of the fuel maps at part throttle
has basically no effect because of the closed-loop O2 system. And at WOT,
very minor effects result there. And besides the engine is driven at part throttle
the majority of the time anyway. These fuel map issues have been discussed many
times here on Rennlist and other forums.
Really? It's called pushing the timing maps or on a 911SC it's called turning the
distributor a few degrees.
And as was mentioned in the same post, tweaking of the fuel maps at part throttle
has basically no effect because of the closed-loop O2 system. And at WOT,
very minor effects result there. And besides the engine is driven at part throttle
the majority of the time anyway. These fuel map issues have been discussed many
times here on Rennlist and other forums.
03-14-2008, 02:45 PM
#94
Dave, thx for the info on the Club Sport. Was the Club Sport based on the US or Euro chip? or did the US and Euro cars use the same chip?
03-14-2008, 03:47 PM
#95
The "8" chip (1267355358) and the US Club Sport chip are identical in every way, except the rev limit on the "8* is 6540, and the rev limit on the CS is 6840. Don't know if the Euro Club Sport chips were different from the US Club Sport chips.
03-14-2008, 06:43 PM
#96
"except the rev limit on the "8* is 6540"
Actually per the Porsche manual WKD 423 020, the RPM limit is 6520 to be exact.
Some tuners (as mentioned on this thread) set the limit to 6840 vs the 6520,
which Porsche set for the Club Sport (USA & EURO) & which had a non-standard engine,
e.g. hollow valves (per WKD 494 021).
Actually per the Porsche manual WKD 423 020, the RPM limit is 6520 to be exact.
Some tuners (as mentioned on this thread) set the limit to 6840 vs the 6520,
which Porsche set for the Club Sport (USA & EURO) & which had a non-standard engine,
e.g. hollow valves (per WKD 494 021).
03-15-2008, 12:50 PM
#98
And since the topic of the special production (SP) car, i.e. the Club Sport 911
Carrera with all its mods, was mentioned, isn't interesting that Porsche didn't
push the timing beyond the stock 911's as performance chips do, but just raised
the rev limit. So, Porsche was overly conservative with the standard production
Carrera's timing, as has been used as a basis for pushing the timing by the "tuners",
right?
Note: Per Porsche manual WKD 495 421 (911 Carrera) the fuel grade indicated
is 95 octane for the USA engine. The ROW engine required 98 octane. During the
late 1980s and early 1990s, 97/98 octane was the high grade octane and readily
available.
Carrera with all its mods, was mentioned, isn't interesting that Porsche didn't
push the timing beyond the stock 911's as performance chips do, but just raised
the rev limit. So, Porsche was overly conservative with the standard production
Carrera's timing, as has been used as a basis for pushing the timing by the "tuners",
right?
Note: Per Porsche manual WKD 495 421 (911 Carrera) the fuel grade indicated
is 95 octane for the USA engine. The ROW engine required 98 octane. During the
late 1980s and early 1990s, 97/98 octane was the high grade octane and readily
available.
Last edited by Lorenfb; 03-16-2008 at 02:08 PM.
03-15-2008, 01:09 PM
#99
Addict
Rennlist Member
Rennlist Member
"Porsche didn't push the timing beyond the stock 911's..."
yeah, & isn't it interesting that a quarter century ago the factory couldn't & wouldn't count on there being 92-93 oct gas available over the lifespan of these cars... when owner-enthusiasts are determining if & how to mod their 911s, they should consider more than WHAT the factory did, but also WHY & HOW they made their design, engineering, production and maint. decisions.
yeah, & isn't it interesting that a quarter century ago the factory couldn't & wouldn't count on there being 92-93 oct gas available over the lifespan of these cars... when owner-enthusiasts are determining if & how to mod their 911s, they should consider more than WHAT the factory did, but also WHY & HOW they made their design, engineering, production and maint. decisions.
03-15-2008, 07:43 PM
#100
Rennlist Member
"I really think this is the magic!"
Really? It's called pushing the timing maps or on a 911SC it's called turning the
distributor a few degrees.
And as was mentioned in the same post, tweaking of the fuel maps at part throttle
has basically no effect because of the closed-loop O2 system. And at WOT,
very minor effects result there. And besides the engine is driven at part throttle
the majority of the time anyway. These fuel map issues have been discussed many
times here on Rennlist and other forums.
Really? It's called pushing the timing maps or on a 911SC it's called turning the
distributor a few degrees.
And as was mentioned in the same post, tweaking of the fuel maps at part throttle
has basically no effect because of the closed-loop O2 system. And at WOT,
very minor effects result there. And besides the engine is driven at part throttle
the majority of the time anyway. These fuel map issues have been discussed many
times here on Rennlist and other forums.
What part of anyone here or on Pelican, or any other forums that you infect not having any respect for you, do you not understand?
03-15-2008, 09:06 PM
#101
Rennlist Member
"Porsche didn't push the timing beyond the stock 911's..."
yeah, & isn't it interesting that a quarter century ago the factory couldn't & wouldn't count on there being 92-93 oct gas available over the lifespan of these cars... when owner-enthusiasts are determining if & how to mod their 911s, they should consider more than WHAT the factory did, but also WHY & HOW they made their design, engineering, production and maint. decisions.
yeah, & isn't it interesting that a quarter century ago the factory couldn't & wouldn't count on there being 92-93 oct gas available over the lifespan of these cars... when owner-enthusiasts are determining if & how to mod their 911s, they should consider more than WHAT the factory did, but also WHY & HOW they made their design, engineering, production and maint. decisions.
03-15-2008, 09:40 PM
#102
Rennlist Member
You don't really suppose that a MORON can use his brain and actually think logically beyond what she thinks to be the final word?
03-16-2008, 06:01 AM
#103
Rennlist Member
03-16-2008, 11:45 AM
#105
As far as Octane I really think the Porsche Design Team had to play it safe and assumed 93 octane would not always be run in the car. So I feel you could push the timing a bit further. I consulted some 911 3.2L race folks and thier tunners that run non stock EFI systems and asked them how far they push timing without a knock sensor? Some said don't go more than 30deg advance others said 32deg so this is the max being used in (Some) track cars running hi-grade 93oct and above. My car has custom chip and does not exceed about 29deg advance.
If you play with timming you better know what you are doing, as I say you are dancing between detonation and power safer to give up some power. Don't over push the timing.
Just my views on this of course.
If you play with timming you better know what you are doing, as I say you are dancing between detonation and power safer to give up some power. Don't over push the timing.
Just my views on this of course.