Porken's 85 chips- Awesome!
#61
Rennlist Member
327 HP at the rear wheels is incredible! If I'm doing my math right, that's 327/.85 = 385 HP at the crank, almost a 100 over stock. Seems too good to be true, but if it is, I'm excited. (my 87 FPR is on the way)
I dynoed at 264 RWHP (310 at the crank) over the summer. This is 22HP over stock and all I have is clone chips and RMB. This makes me wonder about Ken's dyno sheets showing a stock 86.5 producing around 249, maybe it wasn't running great? If the AA chips don't effect max HP, then the RMB actually adds about 15HP, all other things being equal between the two cars, which they probably aren't.
I dynoed at 264 RWHP (310 at the crank) over the summer. This is 22HP over stock and all I have is clone chips and RMB. This makes me wonder about Ken's dyno sheets showing a stock 86.5 producing around 249, maybe it wasn't running great? If the AA chips don't effect max HP, then the RMB actually adds about 15HP, all other things being equal between the two cars, which they probably aren't.
#62
Race Car
Looks like you have 290-300rwhp. Drivetrain loss for a 5-speed is usually around 10 - 15%. This seems to be the norm with well-running 32-valve 5.0 liter engines with X-pipe (S3's with some tuning help). The dip is normal with stock intake. It was something that Porsche tried to change with the S4 intake. The S4 still has a dip there, just not as big and the torque peak is after the dip instead of before.
Dan
'91 928GT S/C 475hp/460lb.ft
Dan
'91 928GT S/C 475hp/460lb.ft
#63
Craic Head
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327 HP at the rear wheels is incredible! If I'm doing my math right, that's 327/.85 = 385 HP at the crank, almost a 100 over stock. Seems too good to be true, but if it is, I'm excited. (my 87 FPR is on the way)
I dynoed at 264 RWHP (310 at the crank) over the summer. This is 22HP over stock and all I have is clone chips and RMB. This makes me wonder about Ken's dyno sheets showing a stock 86.5 producing around 249, maybe it wasn't running great? If the AA chips don't effect max HP, then the RMB actually adds about 15HP, all other things being equal between the two cars, which they probably aren't.
I dynoed at 264 RWHP (310 at the crank) over the summer. This is 22HP over stock and all I have is clone chips and RMB. This makes me wonder about Ken's dyno sheets showing a stock 86.5 producing around 249, maybe it wasn't running great? If the AA chips don't effect max HP, then the RMB actually adds about 15HP, all other things being equal between the two cars, which they probably aren't.
Looks like you have 290-300rwhp. Drivetrain loss for a 5-speed is usually around 10 - 15%. This seems to be the norm with well-running 32-valve 5.0 liter engines with X-pipe (S3's with some tuning help). The dip is normal with stock intake. It was something that Porsche tried to change with the S4 intake. The S4 still has a dip there, just not as big and the torque peak is after the dip instead of before.
Dan
'91 928GT S/C 475hp/460lb.ft
Dan
'91 928GT S/C 475hp/460lb.ft
Don,
I made the same mistake. It was actually an estimated 327 at the crank. He said about 307 at the wheels. If 15% drivetrain loss is the rule for 5 speeds, that's about 361 at the crank, right?
#64
Rennlist Member
I have here another datachart for a 928 gt. The software says enginepower 340 HP,wheelpower 319.5 HP.
Drivetrainloss 20.2 HP
The question is :how efficient is the 5 gear in a Porsche 928 gearbox?
327 HP -15 % = 278 HP /wheels.
327 " -12 % = 287 HP "
Edit:
I did a call with the dynooperator and he says between 12-15 %.
Drivetrainloss 20.2 HP
The question is :how efficient is the 5 gear in a Porsche 928 gearbox?
327 HP -15 % = 278 HP /wheels.
327 " -12 % = 287 HP "
Edit:
I did a call with the dynooperator and he says between 12-15 %.
#65
Craic Head
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Member
Lifetime Rennlist
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I have here another datachart for a 928 gt. The software says enginepower 340 HP,wheelpower 319.5 HP.
Drivetrainloss 20.2 HP
The question is :how efficient is the 5 gear in a Porsche 928 gearbox?
327 HP -15 % = 278 HP /wheels.
327 " -12 % = 287 HP "
Edit:
I did a call with the dynooperator and he says between 12-15 %.
Drivetrainloss 20.2 HP
The question is :how efficient is the 5 gear in a Porsche 928 gearbox?
327 HP -15 % = 278 HP /wheels.
327 " -12 % = 287 HP "
Edit:
I did a call with the dynooperator and he says between 12-15 %.
So what we need is to know what it actually showed at the wheels in order to get a better idea of how it compares with others who have done the same.
#66
Race Car
Dan
'91 928GT S/C 475hp/460lb.ft
#68
Race Car
Dan
'91 928GT S/C 475hp/460lb.ft
#69
Racer
Hi,
Is there any project of chips developpement for a GT? If you have added functionnality as the OEM chips did not have, it could be interesting to improve it on a GT no?
Puyi
Is there any project of chips developpement for a GT? If you have added functionnality as the OEM chips did not have, it could be interesting to improve it on a GT no?
Puyi
#70
Craic Head
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I've read a lot about dyno numbers and two things are pretty consistent:
1. Using a percentage rather than a flat number for HP loss is generally the way it's done. Whether you agree on the percentage of drivetrain loss is another question.
2. Nothing is consistent
#71
This is a really great reason to find a 86.5. Make it black.
#72
Inventor
Rennlist Member
Rennlist Member
Looks like you have 290-300rwhp. Drivetrain loss for a 5-speed is usually around 10 - 15%. This seems to be the norm with well-running 32-valve 5.0 liter engines with X-pipe (S3's with some tuning help). The dip is normal with stock intake. It was something that Porsche tried to change with the S4 intake. The S4 still has a dip there, just not as big and the torque peak is after the dip instead of before.
#73
Inventor
Rennlist Member
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It's tough to compare Karsten's dyno run to a SAE DynoJet. It's obvious it's better than stock! (I'd say roughly 12% over stock.) The curves look very nice, and it was done in 5th gear, a 1:1 ratio, which normally doesn't happen here because of the high tire speeds with the 2.20 ratio!
Roughly 300 ft/lbs at the wheels at 2580 rpm! That's why it drives so nicely. When dynoing a S3, if you start the run after 2500 rpm, you're missing the first torque peak! Need to start at 1500 or so.
Note that Karsten's S3 is the lower compression, 9.3:1 ROW 32V. Stock, they are rated -4 hp/-7 tq than the 10.1:1 USA 32V. I can't wait to see Mike's or some other USA 5-speed on a DynoJet!
I think the latest LH2²r version, which is a little leaner overall will make higher numbers. With the fueling sorted, I'm wondering if retarding the cams 3-5° would push the hp higher?
Funny that the factory power graphs edit out the harmonic 'hole' in torque at 3200 rpm.
For a rough chip/no chip comparo, here's a MS SLC dyno of a '86.5 5-speed with their X-pipe w/pumkin vs. an Ott pipe w/pumkin vs. stock (from this thread).
Roughly 300 ft/lbs at the wheels at 2580 rpm! That's why it drives so nicely. When dynoing a S3, if you start the run after 2500 rpm, you're missing the first torque peak! Need to start at 1500 or so.
Note that Karsten's S3 is the lower compression, 9.3:1 ROW 32V. Stock, they are rated -4 hp/-7 tq than the 10.1:1 USA 32V. I can't wait to see Mike's or some other USA 5-speed on a DynoJet!
I think the latest LH2²r version, which is a little leaner overall will make higher numbers. With the fueling sorted, I'm wondering if retarding the cams 3-5° would push the hp higher?
Funny that the factory power graphs edit out the harmonic 'hole' in torque at 3200 rpm.
For a rough chip/no chip comparo, here's a MS SLC dyno of a '86.5 5-speed with their X-pipe w/pumkin vs. an Ott pipe w/pumkin vs. stock (from this thread).
Last edited by PorKen; 12-12-2009 at 03:25 PM.
#74
Inventor
Rennlist Member
Rennlist Member
Someone should at least make chips for S4/GT/GTS to work with 24# injectors. (Don't look at me! )