Recent Frankie dynos
#16
Nordschleife Master
Thread Starter
I wouldn't run the supertrapp on the street myself, I don't like the sound! But, it works for the track.
Don't have dynos on my work comp, will post them up tonight. 10 discs worked on my #2 engine but not on my #1, both of which were running the same chip and header. I don't have an explanation for the difference, but you will agree when you see the dyno
Don't have dynos on my work comp, will post them up tonight. 10 discs worked on my #2 engine but not on my #1, both of which were running the same chip and header. I don't have an explanation for the difference, but you will agree when you see the dyno
#17
Three Wheelin'
Good job Tim!
I'm afraid that with my modest mod's to my car, I'll be in NASA's GTS2 category...running with the big boys for sure!
If I learned anything from making changes to my car...it's that you really need to consider how it will affect your classification standings in the future.
On the other hand, if you're not going to race...then just have at it!!
Jason
I'm afraid that with my modest mod's to my car, I'll be in NASA's GTS2 category...running with the big boys for sure!
If I learned anything from making changes to my car...it's that you really need to consider how it will affect your classification standings in the future.
On the other hand, if you're not going to race...then just have at it!!
Jason
#18
Nordschleife Master
Thread Starter
Below is a dyno from #1 and #2 engine, both running 10 discs. There is a clear difference but I haven't a clue as to why. Same chip, header and exhaust.
#20
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Thanks for posting Tim! I really value people like yourself who are willing to share info like this.
Very interesting in the gains with no muffler - this goes against what most people have said about the 968 motor.
Very interesting in the gains with no muffler - this goes against what most people have said about the 968 motor.
#21
Rennlist Member
Remember this is racing, headers, stage 2 chip and no one really cares below 4000 rpm. The one engine seems to have a problem about 6000 rpm. Any idea what that is?
#22
Nordschleife Master
Thread Starter
As for "this is racing... below 4000 rpm"; I have yet to see any dynos of a stock 968 run on a dyno with and without restriction. If you look at the beginning post in this thread, you will see that hp and tq are increased pretty much across the board with the open pipe relative to the 16 disc run. Yes, I am running a chip, header, and "test-type" pipe. Feel free to show me data on a stock 968 with and without restriction. I'm a firm believer in data, not dogma
#23
Nordschleife Master
Thread Starter
Just had a thought, at what RPM does the knock sensor kick in? Could the valley on the resticted engine be related to retarded timing?
#24
Rennlist Member
I never scanned my dyno runs but will make it a priority to get them scanned and post. They are from my completely stock 968 cabriolet.
I also did a run with airbox mod and picked up an additional 3rwhp.
Dyno post to follow.
Raj
I also did a run with airbox mod and picked up an additional 3rwhp.
Dyno post to follow.
Raj
#26
Nordschleife Master
Thread Starter
#27
The knock sensor doesn't kick in at any certain RPM. If there is detonation then it will kick back the timing accordingly to try and stop it. It may be from your knock sensor, or just the differences with the muffler.
#28
Three Wheelin'
Join Date: Jul 2001
Location: San Francisco, CA Porsche: '92 968 Blk/Cashmere
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#29
Three Wheelin'
Join Date: Jul 2001
Location: San Francisco, CA Porsche: '92 968 Blk/Cashmere
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Do you feel it drop off when driving the car? That's a pretty abrupt drop and regain of about 40hp/tq. My guess is that it would feel like hitting a brick wall at that rpm. If the two engines feel the same, it's probably just an artifact of a bad dyno measurement.
#30
Nordschleife Master
Thread Starter
Any chance there could have been tire slippage on the dyno rollers?
Do you feel it drop off when driving the car? That's a pretty abrupt drop and regain of about 40hp/tq. My guess is that it would feel like hitting a brick wall at that rpm. If the two engines feel the same, it's probably just an artifact of a bad dyno measurement.
Do you feel it drop off when driving the car? That's a pretty abrupt drop and regain of about 40hp/tq. My guess is that it would feel like hitting a brick wall at that rpm. If the two engines feel the same, it's probably just an artifact of a bad dyno measurement.